MCQ Quiz on Fundamental of Electrical & Electronics Engineering

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Unit- 1 : Electric and Magnetic Circuits

/20

1 votes, 5 avg

329

Created on October 13, 2022 By

Electrical Notebook

2nd Semester

FEEE Unit-1.1 : Concept of Passive Components: Resistors, Capacitors, Inductors

Fundamentals of Electrical & Electronics Engineering

Diploma in Engineering & Technology

2nd Semester - Common to all branch

1 / 20

Category: Basic Electricity

1. A wire having an area of cross section = 10sqm and another wire having an area of cross section= 15sqm, have the same length and are made up of the same material. Which wire has more resistance?

A) The 10 sqm wire has higher resistance

B) Both have equal resistance

C) The 15 sqm wire has higher resistance

D) The value of resistance cannot be determined from the given data

2 / 20

Category: Basic Electricity

2. Frequency of Direct Current is

A) 50 kHz

B) 0 Hz

C) 40 Hz

D) 50 Hz

3 / 20

Category: Basic Electricity

3. If the length of a wire is doubled and diameter is halved, then the resistance will become _________ of the previous.

A) 8 times

B) 16 times

C) 4 times

D) 32 times

4 / 20

Category: Basic Electricity

4. Resistance of any circuit depends on –

A) Inversely proportionate with length and directly proportionate with cross sectional area

B) Directly proportionate with length and inversely proportionate with cross sectional area

C) Directly proportionate with length and cross sectional area

D) Inversely proportionate with length and cross sectional area

5 / 20

Category: Basic Electricity

5. An Inductor works as a ___________ circuit for DC supply.

A) Non-polar

B) Open

C) Polar

D) Short

6 / 20

Category: Basic Electricity

6. Color code for 1 ohm +-10% resistor is

A) Black Brown Black Golden

B) Brown Black Golden Golden

C) Brown Black Golden Silver

D) Black Brown Black Silver

7 / 20

Category: Basic Electricity

7. Three lamps are connected in parallel across the voltage source. What happen if one lamp will burn out? –

A) The other two lamps will glow

B) Total current in the circuit will increase

C) all the three will glow

D) no bulb will glow

8 / 20

Category: Basic Electricity

8. If the length of a wire is doubled and diameter is halved, then the resistance will become –

A) 32 times

B) 8 times

C) 16 times – of the previous

D) 4 times

9 / 20

Category: Basic Electricity

9. A choke coil is a coil having-

A) High inductance high capacitance

B) Low inductance high resistance

C) Low resistance high capacitance

D) High inductance negligible resistance

10 / 20

Category: Basic Electricity

10. In a pure inductive circuit current is

A) Leads by voltage by 90°

B) Lags behind Voltage by 90°

C) Leads by voltage by 0°

D) Lags by voltage by 0°

11 / 20

Category: Basic Electricity

11. Three lamps are connected in parallel across the voltage source. What happen if one lamp will burn out?

A) The other two lamps will glow

B) No bulb will glow

C) All the three will glow

D) Total current in the circuit will increase

12 / 20

Category: Basic Electricity

12. If a capacitor is connected with DC supply, it will act as –

A) Open circuit

B) A short circuit

C) A normal capacitor as in AC

D) A resistor

13 / 20

Category: Basic Electricity

13. Calculate the ratio of the resistivity of 2 wires having the same length and same resistance with area of cross section 2m² and 5m² respectively.

A) 2:5

B) 5:7

C) 7:5

D) 2:7

14 / 20

Category: Basic Electricity

14. The reciprocal of resistivity is________

A) Conductivity

B) Impedance

C) Conductance

D) Resistance

15 / 20

Category: Basic Electricity

15. A wire has the same resistance as the one given in the figure. Calculate its resistivity if the length of the wire is 10m and its area of cross section is 2m.

A) 8 kilo ohm-meter

B) 8 ohm-meter

C) 16 kiloohm-meter

D) 16 ohm-meter

Hints:

From the given circuit, R=V/I = 200/5 = 40 ohm.
Resistivity= Resistance x Area of cross section/ Length of the wire.

Resistivity= 40 x 2/10= 8 ohm-meter.

16 / 20

Category: Basic Electricity

16. What is the relation between resistance R and resistivity ρ of a wire ?

A) R= a/( ρ.l)

B) R=ρ. (l/a)

C) R= ρ. (a/l)

D) R= l/( ρ.a)

17 / 20

Category: Basic Electricity

17. Calculate the value of energy stored in an inductor if the value of inductance is 10H and 2A of current flows through it.-

A) 15 J

B) 60 J

C) 20 J

D) 90 J

18 / 20

Category: Basic Electricity

18. If a capacitor is connected with DC supply, it will act as –

A) a short circuit

B) open circuit

C) a resistor

D) a normal capacitor as in AC

19 / 20

Category: Basic Electricity

19. The Inductor doesn’t allow sudden changes in

A) Current

B) Inductance

C) Voltage

D) Resistance

20 / 20

Category: Basic Electricity

20. Which of the following statements are true with regard to resistivity?

A) Resistivity depend on area of cross section

B) Resistivity depend on the length

C) Resistance does not depend on the temperature

D) Resistance depends on the temperature

Your score is

The average score is 40%

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/20

0 votes, 0 avg

Created on October 14, 2022 By

Electrical Notebook

2nd Semester

FEEE Unit-1.2 : Different types of signal waveforms: DC/AC, voltage/current, periodic/non-periodic

Fundamentals of Electrical & Electronics Engineering

Diploma in Engineering & Technology

2nd Semester - Common to all branch

1 / 20

Category: Basic Electricity

1. Periodic is characterized by a repetition at fixed time intervals

A) False

B) True

2 / 20

Category: Basic Electricity

2. A saw-tooth wave has a period of 10 ms. Its frequency is

A) 100 Hz

B) 1,000 Hz

C) 10 Hz

D) 50 Hz

Hints:

Frequency = 1/time period

3 / 20

Category: Basic Electricity

3. A sinusoidal current has an rms value of 14 mA. The peak-to-peak value is

A) 22.6 mA

B) 39.6 mA

C) 45.12 mA

D) 16 mA

4 / 20

Category: Basic Electricity

4. How many degrees are there in π/3 rad?

A) 180°

B) 27°

C) 6°

D) 60°

5 / 20

Category: Basic Electricity

5. If the rms voltage drop across a 15 kΩ resistor is 16 V, the peak current through the resistor is

A) 10 mA

B) 1 mA

C) 1.5 mA

D) 15 mA

6 / 20

Category: Basic Electricity

6. A signal with a 400 μs period has a frequency of

A) 2,500 Hz

B) 250 Hz

C) 400 Hz

D) 25,000 Hz

7 / 20

Category: Basic Electricity

7. One sine wave has a positive-going zero crossing at 15° and another sine wave has a positive-going zero crossing at 55°. The phase angle between the two waveforms is

A) 0°

B) 45°

C) 40°

D) None of the above

8 / 20

Category: Basic Electricity

8. The duty cycle of a pulse waveform with a pulse width of 10 µs and a period of 100 µs is 25%.

A) False

B) True

9 / 20

Category: Basic Electricity

9. When a sine wave has a frequency of 100 Hz in 12 s it goes through

A) 120 cycles

B) 12 cycles

C) 1,200 cycles

D) 1/100 cycle

10 / 20

Category: Basic Electricity

10. If a sine wave goes through 10 cycles in 20 μs, the period is

A) 4 μs

B) 20 μs

C) 100 μs

D) 2 μs

11 / 20

Category: Basic Electricity

11. Amplitude is the maximum value of a voltage or current

A) True

B) False

12 / 20

Category: Basic Electricity

12. The unit of frequency is the hertz

A) True

B) False

13 / 20

Category: Basic Electricity

13. The average half-cycle value of a sine wave with a 40 V peak is

A) 50.96 V

B) 25.48 V

C) 6.37 V

D) 14.14 V

14 / 20

Category: Basic Electricity

14. Average value of a sine wave is 0.707 times the peak value

A) True

B) False

15 / 20

Category: Basic Electricity

15. A pulse waveform has a high time of 8 ms and a pulse width of 32 ms. The duty cycle is

A) 100%

B) 50%

C) 25%

D) 1%

16 / 20

Category: Basic Electricity

16. A phasor represents

A) The width of a quantity

B) The magnitude of a quantity

C) The phase angle

D) The magnitude and a quantity direction

17 / 20

Category: Basic Electricity

17. A 20 kHz pulse waveform consists of pulses that are 15 μs wide. The duty cycle is

A) 30%

B) 100%

C) 1%

D) Cannot be determined

Hints :

Frequency = 1/t = 1/15x10^-6 = 66666.67 Hz = 66.66 kHz

Pulse waveform = 20 kHz

Duty cycle = Pulse waveform/frequency = 20/66.66 = 0.3x100% = 30%

18 / 20

Category: Basic Electricity

18. The instantaneous value is the voltage or current value of a waveform at its peak

A) False

B) True

19 / 20

Category: Basic Electricity

19. If the rms current through a 4.7 kΩ resistor is 4 mA, the peak voltage drop across the resistor is

A) 4 V

B) 18.8 V

C) 2.66 V

D) 26.6 V

20 / 20

Category: Basic Electricity

20. If the peak of a sine wave is 13 V, the peak-to-peak value is

A) 26 V

B) 13 V

C) None of the above

D) 6.5 V

Your score is

The average score is 43%

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/16

0 votes, 0 avg

Created on October 14, 2022 By

Electrical Notebook

2nd Semester

FEEE Unit-1.3 : Voltage/current sources: Ideal/non-ideal ,independent/dependent , source transformation

Fundamentals of Electrical & Electronics Engineering

Diploma in Engineering & Technology

2nd Semester - Common to all branch

1 / 16

Category: Basic Electricity

1. Ideal voltage source has-

A) High internal resistance

B) Zero internal resistance

C) Low internal resistance

D) Infinity internal resistance

2 / 16

Category: Basic Electricity

2. In a parallel circuit, with a number of resistors, the voltage across each resistor is ________

A) Is divided equally among all resistors

B) Is divided proportionally across all resistors

C) Is zero for all resistors

D) The same for all resistors

3 / 16

Category: Basic Electricity

3. In a _________ circuit, the total resistance is greater than the largest resistance in the circuit.

A) Neither series nor parallel

B) Series

C) Parallel

D) Either series or parallel

4 / 16

Category: Basic Electricity

4. What happens to the current in the series circuit if the resistance is doubled?

A) It becomes half its original value

B) It becomes double its original value

C) It becomes zero

D) It becomes infinity

5 / 16

Category: Basic Electricity

5. The energy per unit charge is

A) Voltage

B) Power

C) Current

D) Work

Hints: Voltage v=dw/dq and its SI unit is volt

6 / 16

Category: Basic Electricity

6. Which is the most cost efficient connection?

A) Either series or parallel

B) Series

C) Neither series nor parallel

D) Parallel

7 / 16

Category: Basic Electricity

7. If two bulbs are connected in parallel and one bulb blows out, what happens to the other bulb?

A) The other bulb blows out as well

B) The other bulb stops glowing

C) The other bulb continues to glow with the same brightness

D) The other bulb glows with increased brightness

8 / 16

Category: Basic Electricity

8. What is the voltage measured across a series short?
a) b) c) d)

A) The value of the source voltage

B) Zero

C) Null

D) Infinite

9 / 16

Category: Basic Electricity

9. Active circuit have -

A) one voltage source

B) either a or b

C) one current source

D) none of these

10 / 16

Category: Basic Electricity

10. If there are two bulbs connected in series and one blows out, what happens to the other bulb?

A) The other bulb continues to glow with the same brightness

B) The other bulb glows with increased brightness

C) The other bulb stops glowing

D) The other bulb also burns out

11 / 16

Category: Basic Electricity

11. In a series circuit, which of the parameters remain constant across all circuit elements such as resistor, capacitor and inductor etc?

A) Current

B) Both voltage and current

C) Voltage

D) Neither voltage nor current

12 / 16

Category: Basic Electricity

12. Ideal voltage source has-

A) Low internal resistance

B) Zero internal resistance

C) High internal resistance

D) Infinity internal resistance

13 / 16

Category: Basic Electricity

13. The current in each branch of a parallel circuit is proportional to _________

A) Proportional to the power in the circuit

B) Proportional to the value of the resistors

C) The amount of time the circuit

D) Equal in all branches

14 / 16

Category: Basic Electricity

14. Many resistors connected in series will?

A) Reduce the power to zero

B) Divide the current proportionally

C) Increase the source voltage in proportion to the values of the resistors

D) Divide the voltage proportionally among all the resistor

15 / 16

Category: Basic Electricity

15. Batteries are generally connected in______

A) Parallel

B) Series

C) Either series or parallel

D) Neither series nor parallel

16 / 16

Category: Basic Electricity

16. In a ____________ circuit, the total resistance is smaller than the smallest resistance in the circuit

A) Series

B) Neither series nor parallel

C) Parallel

D) Either series or parallel

Your score is

The average score is 40%

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/16

0 votes, 0 avg

Created on October 14, 2022 By

Electrical Notebook

2nd Semester

FEEE Unit-1.4 : Simple problems on source transformation

Fundamentals of Electrical & Electronics Engineering

Diploma in Engineering & Technology

2nd Semester - Common to all branch

1 / 16

Category: Basic Electricity

1. Voltage across the 60 ohm resistor is______

A) 120 V

B) 72 V

C) 0 V

D) 48 V

2 / 16

Category: Basic Electricity

2. The voltage across the open circuit is?

A) Infinity

B) 90 V

C) 0 V

D) 100 V

3 / 16

Category: Basic Electricity

3. Calculate the current across the 20 ohm resistor

A) 6.67 A

B) 10 A

C) 20 A

D) 36.67 A

4 / 16

Category: Basic Electricity

4. The currents in the three branches of a parallel circuit are 3 A, 4 A and 5 A. What is the current leaving it?

A) 0 A

B) Insufficient data provide

C) The largest one among the three values

D) 12 A

Hints:

Apply KCL and the result will be summation of 3+4+5 A = 12 A

5 / 16

Category: Basic Electricity

5. The total resistance between A and B are?

A) 20 ohm

B) 5 ohm

C) 80 ohm

D) 0 ohm

6 / 16

Category: Basic Electricity

6. Find the voltage across the 6 ohm resistor

A) 150 V

B) 181.6 V

C) 54.48 V

D) 27.27 V

7 / 16

Category: Basic Electricity

7. Calculate the total current in the circuit

A) 11.43 A

B) 15 A

C) 10 A

D) 20 A

Hints: The 1 ohm and 2 ohm resistor are in series which is in parallel to the 3 ohm resistor. The equivalent of these resistances (3/2 ohm) is in series with the 4 ohm and 5 ohm resistor. Total R = 21/2 ohm. I=V/R=120/(21/2)=240/21=11.43 A.

8 / 16

Category: Basic Electricity

8. The voltage across the short is?

A) Zero

B) Infinity

C) 11.25 V

D) 135 V

Hints:

As there is no resistance i.e. directly shorted across the voltage souce, so there will be no voltage drop and infinity current will flow through the short circuit path. So voltage drop will be zero.

9 / 16

Category: Basic Electricity

9. Calculate the resistance between A and B

A) 7 ohm

B) 14.26 ohm

C) 3.56 ohm

D) 29.69 ohm

Hints:

The 1 ohm, 2 ohm and 3 ohm resistors are connected in parallel. Its equivalent resistance is in series with the 4 ohm resistor and the parallel connection of the 5 ohm and 6 ohm resistor. The equivalent resistance of this combination is 80/11 ohm. This is in parallel with 7 ohm to give equivalent resistance between A and B is 3.56 ohm.

10 / 16

Category: Basic Electricity

10. What is the value of x if the current in the circuit is 5 A?

A) 25 ohm

B) 55 ohm

C) 75 ohm

D) 15 ohm

11 / 16

Category: Basic Electricity

11. If the current through x ohm resistance in the circuit is 5A, find the value of x

A) 27 ohm

B) 135 ohm

C) 5 ohm

D) 12 ohm

Hints:

R=V/I. In this circuit I=5A and V=135V. Therefore, R=135/5=27 ohm.

12 / 16

Category: Basic Electricity

12. Calculate the total resistance between the points A and B.

A) 0.48 ohm

B) 7.67 ohm

C) 7 ohm

D) 0 ohm

Hints:

1 ohm in parallel with 2 ohm give 2/3 ohm equivalent which is in series with 4 ohm and 3 ohm so total resistance between A and B = 4 + 2/3 + 3 = 23/3 = 7.67 ohm.

13 / 16

Category: Basic Electricity

13. Find the current in the circuit.

A) 1 A

B) 3 A

C) 4 A

D) 2 A

14 / 16

Category: Basic Electricity

14. Calculate the equivalent resistance between A and B

A) 46.67 ohm

B) 26.67 ohm

C) 6.67 ohm

D) 10.67 ohm

Hints:

R=20||20||20=6.67 ohm. The three 20 ohm resistors are in parallel and resistance is measured across this terminal.

15 / 16

Category: Basic Electricity

15. Calculate the equivalent resistance between A and B

A) 4 ohm

B) 2 ohm

C) 8 ohm

D) 6 ohm

Hints:

R=((2+3)||5)+1.5)||4. The 2 and the 3 ohm resistor are in series. The equivalent of these two resistors is in parallel with the 5 ohm resistor. The equivalent of these three resistances is in series with the 1.5 ohm resistor. Finally, the equivalent of these resistances is in parallel with the 4 ohm resistor.

16 / 16

Category: Basic Electricity

16. Calculate the equivalent resistance between A and B

A) 48 ohm

B) 12 ohm

C) 15 ohm

D) 60 ohm

Hints:

5 ohm and 15 ohm are connected in series to give 20 ohm.10ohm and 20 ohm are connected in series to give 30 ohm. Now both equivalent resistances (20ohm and 30 ohm) are in parallel to give equivalent resistance 20*30/(20+30) = 12 ohm.

Your score is

The average score is 39%

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Unit- 2 : Electric and Magnetic Circuits

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Created on October 13, 2022 By

Electrical Notebook

2nd Semester

FEEE Unit-2.1 : Concept of EMF, Current, Potential Difference, Power and Energy

Fundamentals of Electrical & Electronics Engineering

Diploma in Engineering & Technology

2nd Semester - Common for all branches

1 / 13

Category: Basic Electricity

1. Three lamps are connected in parallel across the voltage source. What happen if one lamp will burn out? –

A) Total current in the circuit will increase

B) no bulb will glow

C) The other two lamps will glow

D) all the three will glow

2 / 13

Category: Basic Electricity

2. S.I unit of Power is –

A) Coulomb

B) Joule

C) Watt

D) Watt-hr

3 / 13

Category: Basic Electricity

3. Electric pressure is also called –

A) Voltage

B) Conductance

C) Resistance

D) Energy

4 / 13

Category: Basic Electricity

4. Insulating material can –

A) Store varying voltage

B) protect a open circuit between the voltage source and load

C) Protect a short circuit between two conductors

D) Conduct very large current

5 / 13

Category: Basic Electricity

5. S.I unit of conductance is –

A) Ohm-m

B) Mho-m

C) Ohm

D) Mho

6 / 13

Category: Basic Electricity

6. The flow of electron in solids is due to –

A) electrons & ions

B) positive charges

C) electrons

D) Atoms

7 / 13

Category: Basic Electricity

7. KWh is the unit of -

A) Work

B) Efficiency

C) Power

D) Energy

8 / 13

Category: Basic Electricity

8. Current & Potential Difference both can be measured using –

A) Ohmmeter

B) Voltmeter

C) Ammeter

D) Multimeter

9 / 13

Category: Basic Electricity

9. In case of D.C –

A) Magnitude and direction remains constant

B) Magnitude and direction both change with time

C) Direction of current changes with time

D) Magnitude of current changes with time

10 / 13

Category: Basic Electricity

10. Instantaneous power in inductor is proportional to the –

A) Temperature of the inductor

B) Product of instantaneous current & rate of change of current

C) Square of instantaneous current

D) Square of rate of change of current

11 / 13

Category: Basic Electricity

11. 1 coulomb charge equals the charge of –

A) 6.24×10^16 electrons

B) 6.24×10^12 electrons

C) 6.24×10^-18 electrons

D) 6.24×10^18 electrons

12 / 13

Category: Magnetic Circuit

12. Induced potential difference due to motion of magnet with respect to the coil is known as -

A) Electromotive force

B) Electromotive difference

C) voltage

D) Magnetomotive force

13 / 13

Category: AC Fundamental

13. Average power taken by a pure capacitor is –

A) Minimum

B) Maximum

C) Zero

D) Unity

Your score is

The average score is 53%

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/20

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Created on October 14, 2022 By

Electrical Notebook

2nd Semester

FEEE Unit-2.2 : M.M.F, magnetic force, permeability, hysteresis loop, reluctance, leakage factor, BH curve and hysteresis loss, eddy current loss. Analogy between electric and magnetic circuits

Fundamentals of Electrical & Electronics Engineering

Diploma in Engineering & Technology

2nd Semester - Common to all branch

1 / 20

Category: AC Fundamental

1. Absolute permittivity of dielectric medium is represented as –

A) εr /ε0

B) ε0 εr

C) εr

D) ε0

2 / 20

Category: Magnetic Circuit

2. In a magnetic material hysteresis loss takes place primarily due to –

A) molecular friction

B) flux density lagging behind magnetising force

C) rapid reversals of its magnetisation

D) its high retentivity

3 / 20

Category: Magnetic Circuit

3. Magnetic field strength is

A) N.ø/I

B) N.i / L

C) None of these

D) N.i

4 / 20

Category: Magnetic Circuit

4. Magnetic field has -

A) none

B) only magnitude

C) Only direction

D) both magnitude & direction

5 / 20

Category: Magnetic Circuit

5. M.M.F in a magnetic circuit is corresponding to ……… in an electric circuit-

A) Voltage drop

B) None

C) Emf

D) Current

6 / 20

Category: Magnetic Circuit

6. A coil of many circular turns of wire wrapped in the shape of a cylinder is known as -

A) both a and c

B) Multi turn coil

C) Insulator

D) Solenoid

7 / 20

Category: Magnetic Circuit

7. Hysteresis loss least depends on –

A) volume of material

B) ambient temperature

C) steinmetz coefficient of material

D) frequency

8 / 20

Category: Magnetic Circuit

8. Electric field & magnetic field are interrelated and are known as –

A) Electric magnets

B) Electromagnetic fields

C) Electromagnets

D) Electromagnetism field

9 / 20

Category: Magnetic Circuit

9. Magnetic field is proportional to the –

A) Quality of electric charges

B) direction of electric charges

C) Speed of electric charges

D) all of these

10 / 20

Category: Magnetic Circuit

10. The reciprocal of permeability is –

A) Resistivity

B) MMF

C) reluctivity

D) Conductivity

11 / 20

Category: Magnetic Circuit

11. Paramagnetic materials are –

A) none

B) Strongly attracted by a magnet

C) slightly attracted by a magnet

D) strongly repelled by a magnet

12 / 20

Category: Magnetic Circuit

12. Strength of the electromagnet can be increased by increasing –

A) number of turns in the circuit

B) either b or c

C) Magnitude of current

D) Reluctance

13 / 20

Category: Magnetic Circuit

13. Magnetic lines of forces –

A) never intersect

B) intersect only in some special circumstances

C) often intersect

D) are not predictable

14 / 20

Category: Magnetic Circuit

14. Which of the following is unit less?

A) Magnetic susceptibility

B) Moment of Magnet

C) Permeability

D) Permittivity

15 / 20

Category: Magnetic Circuit

15. The unit of magnetic flux is –

A) Ampere turns

B) Tesla

C) Weber

D) Henry

16 / 20

Category: Magnetic Circuit

16. S.I unit of Reluctance-

A) AT

B) N/Wb

C) AT/m

D) AT/Wb

17 / 20

Category: Magnetic Circuit

17. Magnetic circuit is a closed path followed by –

A) flux

B) Flux density

C) M.M.F

D) None of these

18 / 20

Category: Magnetic Circuit

18. In a electric circuit MMF is similar to

A) Electromotive force

B) Current

C) Resistance

D) Flux

19 / 20

Category: Magnetic Circuit

19. Unit of magnetic flux density is in S.I.

A) Oersted

B) Tesla

C) WB/m²

D) Both A & B

20 / 20

Category: Basic Electricity

20. To obtain a high value of capacitance, the permittivity of dielectric medium should be –

A) zero

B) Low

C) high

D) unity

Your score is

The average score is 48%

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Created on October 14, 2022 By

Electrical Notebook

2nd Semester

FEEE Unit-2.3 : Electromagnetic induction: Faraday’s laws , Lenz’s law

Fundamentals of Electrical & Electronics Engineering

Diploma in Engineering & Technology

2nd Semester - Common to all branch

1 / 4

Category: Magnetic Circuit

1. The principle of electromagnetic induction was propounded by

A) Orsted

B) Faraday

C) Edison

D) Flemmings

2 / 4

Category: Magnetic Circuit

2. The induced E.M.F. and current always oppose the cause of producing them is according to which law?

A) Newton

B) Coulomb

C) Faraday

D) Lenz

3 / 4

Category: Magnetic Circuit

3. An open coil has –

A) Infinite resistance and zero inductance

B) Zero resistance and inductance

C) Zero resistance and high inductance

D) Infinite resistance and normal inductance

4 / 4

Category: Magnetic Circuit

4. If current in a conductor increases then according to Lenz's law self-induced voltage will –

A) Aid the applied voltage

B) Produce current opposite to the increasing current

C) Tend to decrease the amount of current

D) Aid the increasing current

Your score is

The average score is 60%

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Created on October 14, 2022 By

Electrical Notebook

2nd Semester

FEEE Unit-2.4 : Dynamically induced emf; Statically induced emf; Principle of self and mutual inductance

Fundamentals of Electrical & Electronics Engineering

Diploma in Engineering & Technology

2nd Semester - Common to all branch

1 / 6

Category: Basic Electricity

1. Electrolysis is possible with –

A) D.C supply only

B) none

C) A.C supply only

D) both A.C and D.C supply

2 / 6

Category: Magnetic Circuit

2. Statically induced E.M.F’s magnitude depends on the –

A) Flux magnitude

B) None

C) Coil resistance

D) Rate of change of flux

3 / 6

Category: Magnetic Circuit

3. Which is the property of a coil by which a counter E.M.F is induced when the current through the coil changes?

A) Mutual inductance

B) Capacitance

C) None

D) Self-inductance

4 / 6

Category: DC Machines

4. Principle of dynamically induced E.M.F is used in a –

A) Generator

B) Transformer

C) Thermo-couple

D) Choke

5 / 6

Category: AC Machines & Transformer

5. In which device is the principle of statically induced E.M.F used?

A) Battery

B) Motor

C) Transformer

D) Generator

6 / 6

Category: AC Fundamental

6. Sparking may occurs when a load is switched off due to the presence of –

A) High impedance

B) High capacitance

C) High Inductance

D) Low impedance

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The average score is 50%

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/12

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Created on October 14, 2022 By

Electrical Notebook

2nd Semester

FEEE Unit-2.5 : Energy stored in magnetic circuit

Fundamentals of Electrical & Electronics Engineering

Diploma in Engineering & Technology

2nd Semester - Common to all branch

1 / 12

Category: Magnetic Circuit

1. Higher the self-inductance of a coil –

A) Greater the flux produced by it

B) lower the E.M.F. induced

C) Lesser its Weber-turns

D) longer the delay in establishing steady current through it

2 / 12

Category: Magnetic Circuit

2. Calculate the value of stored energy in an inductor if the value of inductance is 20 H and 4 A of current flows through it.

A) 190 J

B) 160 J

C) 220 J

D) 150 J

Hints:

The expression for energy in an inductor is E = LI²/2 = (20 × 4 × 4) /2 J = 160 J.

3 / 12

Category: Magnetic Circuit

3. What is the power in the magnetic field if the current in a coil has a constant inductance of L henrys grows at a uniform rate?

A) LI^2/ 2t

B) LI / 2t

C) L / 2I^2 t

D) L / 2It

Note: EMF induced in the coil is L. Energy = × = L × = Li²/2. Power = Energy/Time = Li²/2t.

4 / 12

Category: Magnetic Circuit

4. If both the number of turns and the core length of an inductive coil are doubled, then its self-inductance will be –

A) halved

B) Unaffected

C) doubled

D) quadrupled

5 / 12

Category: Magnetic Circuit

5. If the current in a coil having a constant inductance of L henrys grows at a uniform rate, what is the value of the average current?

A) I/2

B) 0

C) I

D) I/4

Note: The average current is the average of the current which flows in the inductor. Hence it is I/2.

6 / 12

Category: Magnetic Circuit

6. In an iron cored coil the iron core is removed so that the coil becomes an air cored coil. The inductance of the coil will –

A) initially increase and then decrease

B) Remain the same

C) Increase

D) decrease

7 / 12

Category: Magnetic Circuit

7. If the current in a coil having a constant inductance of L henrys grows at a uniform rate, what is the value of the average current?

A) I

B) 0

C) I/4

D) I/2

8 / 12

Category: Magnetic Circuit

8. Calculate the emf induced in an inductor if the inductance is 10H and the current is 2 A in 4 s.

A) 1.5 V

B) 2.5 V

C) 3.5 V

D) 5 V

Hints: The expression for emf in an inductive circuit is: e = L = (10 × 2) /4 v = 5V.

9 / 12

Category: Magnetic Circuit

9. Calculate the value of energy stored in an inductor if the value of inductance is 10H and 2 A of current flows through it. –

A) 15 J

B) 20 J

C) 90 J

D) 60 J

Hints: Energy Stored = 0.5 L I² = 0.5×10×2² = 20 J

10 / 12

Category: Magnetic Circuit

10. Energy stored in a magnetic field is given by –

A) LI^2

B) LI^2 / 2

C) L^2 I / 2

D) IL^2

11 / 12

Category: AC Fundamental

11. The energy stored by a capacitor is given by –

A) All of the above

B) 1/2 QV

C) Q^2 / 2C

D) 1/2 CV^2

12 / 12

Category: AC Fundamental

12. In a capacitor, the electrical energy is stored in –

A) both a and b

B) none

C) electric field

D) Magnetic field

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The average score is 51%

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2nd Semester

FEEE Unit-2.6 : Flemming’s Left Hand Rule and Right Hand Rule

Fundamentals of Electrical & Electronics Engineering

Diploma in Engineering & Technology

2nd Semester - Common to all branch

1 / 5

Category: DC Machines

1. The direction of rotation of a dc generator is found out by

A) Left hand thumb rule

B) Palm rule

C) Flemmings Right hand rule

D) Flemmings Left hand rule

2 / 5

Category: DC Machines

2. The direction of rotation of a dc motor is found out by

A) Flemmings Right hand rule

B) Left hand thumb rule

C) Pulm rule

D) Flemmings Left hand rule

3 / 5

Category: Magnetic Circuit

3. When a permanent magnet is cut half what will be the result?

A) Two single pole magnets, one with a north pole and one with a south pole

B) The piece of metal will lose it magnetism

C) Two single pole magnets, each of the magnets only having north poles

D) Two dipole magnets, each with a north and South Pole

4 / 5

Category: Magnetic Circuit

4. A magnetic field like this is called –

A) A parallel field

B) a distorted field

C) A uniform field

D) a paramagnetic field

5 / 5

Category: Magnetic Circuit

5. Which rule do we use to predict the direction of movement of a current carrying wire in a magnetic field?

A) Faraday's Left Hand Rule

B) Faraday's Right Hand Rule

C) Fleming's Left Hand Rule

D) Fleming's Right Hand Rule

Your score is

The average score is 43%

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Electrical Notebook

2nd Semester

FEEE Unit-2.7 : Simple problems on Electric & Magnetic Circuit

Fundamentals of Electrical & Electronics Engineering

Diploma in Engineering & Technology

2nd Semester - Common to all branch

1 / 2

Category: Basic Electricity

1. A bulb consumes 100 W when supply voltage is 200 V. Then find the energy consumed in 30 minutes.

A) 5 kWh

B) 0.05 Wh

C) 0.005 kWh

D) 0.05 kWh

Hints:

Energy consumed = Power x time = 100 x 0.5 = 50 Wh = 0.05 kWh

2 / 2

Category: Basic Electricity

2. If energy required to heat up a heater coil is 4 KWh and the energy loss is 20%, then what is the energy input?

A) 1 kWh

B) 2 kWh

C) 5 kWh

D) 4 kWh

Hints:

Input= 4 kWh+20% = 5 kWh

Your score is

The average score is 42%

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Unit- 3 : AC Circuits

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Electrical Notebook

2nd Semester

FEEE Unit- 3.1 : Concept of Angular speed, Cycle, Frequency, Periodic time, Amplitude, RMS value, Average value, Form Factor, Peak Factor, impedance, phase and phase difference.

Fundamental of Electrical & Electronics Engineering

Diploma in Engineering & Technology

2nd Semester - Common to all branches

1 / 20

Category: AC Fundamental

1. A current is set to be alternating when it changes –

A) Direction only

B) Both magnitude and direction

C) None

D) Magnitude only

2 / 20

Category: AC Fundamental

2. Real part and imaginary part of admittance are respectively –

A) Permeance and Susceptance

B) Reluctance and Permeance

C) Resistance and Reactance

D) Conductance, Susceptance

3 / 20

Category: AC Fundamental

3. If two sinusoids of the same frequency but of different amplitudes and phase angles are subtracted, the resultant is –

A) A sinusoid of the same frequency

B) A sinusoid of half the original frequency

C) Not a sinusoid

D) A sinusoid of double the frequency

4 / 20

Category: AC Fundamental

4. The frequency of an alternating current is –

A) The speed with which the alternator runs

B) the number of electrons passing through a point in one second

C) The number of cycles generated in one minute

D) The number of waves passing through a point in one second

5 / 20

Category: AC Fundamental

5. The square waveform of current has following relation between R.M.S. value and average value –

A) None

B) R.M.S. value of current is greater than average value

C) R.M.S. value of current is less than average value

D) R.M.S. value is equal to average value

6 / 20

Category: AC Fundamental

6. Form factor of half wave rectified ac is-

A) 1.11

B) 1.57

C) 2

D) 1.41

7 / 20

Category: AC Fundamental

7. The peak value of a sine wave is 200 V. Its average value is –

A) 200 V

B) 141.4 V

C) 282.8 V

D) 127.4 V

Hints:

Peak factor = Max value/rms value = 1.41

rms value = 200/1.41 = 141.8 V

Form factor = rms value / avarage value = 1.11

Avarage value = 141.84/1.11 = 127.7 V

8 / 20

Category: AC Fundamental

8. Capacitive Susceptance is a measure of –

A) A purely capacitive circuit's ability to pass current

B) The extent of neutralization of reactive power in a circuit

C) A purely capacitive circuit's ability to resist the flow of current

D) Reactive power in a circuit

9 / 20

Category: AC Fundamental

9. The form factor for a sinusoidal a.c. voltage is –

A) 1.41

B) 1.11

C) 1

D) 0.707

10 / 20

Category: AC Fundamental

10. For a sinusoidal AC voltage, amplitude factor is –

A) 0.707

B) 1.414

C) 0.637

D) 1.11

Hints:

The amplitude factor and peak factor is same. And the value of it for sinusouidal waveform is 1.4142

11 / 20

Category: AC Fundamental

11. Average value can be defined based on which of the following? –

A) Charge transfer

B) Voltage

C) Current

D) Heating effect

12 / 20

Category: AC Fundamental

12. A sine wave has a frequency of 50 Hz. Its angular frequency is _______radian/second.

A) 5 π

B) 100 π

C) 50 π

D) 25 π

Hints:

Angular frequency = 2πf rad/sec = 100π

13 / 20

Category: AC Fundamental

13. In a circuit containing R, L and C, power loss can take place in –

A) L only

B) All of these

C) R only

D) C only

14 / 20

Category: AC Fundamental

14. RMS value can be defined based on which of the following? –

A) Voltage

B) Charge transfer

C) Heating effect

D) Current

15 / 20

Category: AC Fundamental

15. A heater is rated as 230 V, 10 kW. The value 230 V refers to –

A) RMS voltage

B) None

C) Peak voltage

D) Average voltage

16 / 20

Category: AC Fundamental

16. An Alternating Current has a periodic time of 0.02 sec, then the frequency will be –

A) 5 Hz

B) 30 Hz

C) 20 Hz

D) 50 Hz

17 / 20

Category: AC Fundamental

17. Two waves of the same frequency have opposite phase when the phase angle between them is –

A) 90°

B) 180°

C) 360°

D) 0°

18 / 20

Category: AC Fundamental

18. The most important advantage of using electrical energy in the form of a AC is –

A) The construction cost per kilowatt of AC generator is lower than that of DC generator

B) Transformation of voltage is possible in case of AC only

C) Conductor of smaller x-section is required in case of AC in comparison to DC for carrying the same current

D) Less insulation is required in case of AC

19 / 20

Category: AC Fundamental

19. The RMS value of a sine wave is 100 A. Its peak value is –

A) 70.7 A

B) 150 A

C) 282.8 A

D) 141 A

Hints: Peak factor of sine wave = 1.41

Peak value = Peak factor x rms value = 1.41 x 100 = 141 A

20 / 20

Category: AC Fundamental

20. Form factor of square wave is-

A) 1

B) 1.47

C) 2

D) 1.41

Your score is

The average score is 35%

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Electrical Notebook

2nd Semester

FEEE Unit-3.2 : Representation of sinusoidal quantities in (i) exponential form (ii) complex form and (iii) polar form

Fundamentals of Electrical & Electronics Engineering

Diploma in Engineering & Technology

2nd Semester - Common to all branch

1 / 4

Category: AC Fundamental

1. The frequency of an AC voltage,e= 100 cos 314t , will be –

A) 60 Hz

B) 50 Hz

C) None

D) 25 Hz

Hints:

2πf = 314

f= 314/2π = 49.97 Hz = 50 Hz

2 / 4

Category: AC Fundamental

2. The frequency of an AC voltage in India, is–

A) 50 Hz

B) 75 Hz

C) 100 Hz

D) 314 Hz

3 / 4

Category: AC Fundamental

3. The equation for instantaneous value of alternating current is, then time period will be –

A) 0.01 sec

B) 0.04 sec

C) 0.06 sec

D) 0.05 sec

Hints:

2πf= 628

f=628/2π = 99.94 Hz

t= 1/f = 0.01 sec

4 / 4

Category: Basic Electricity

4. What is the RMS value of the current if the maximum value of sine wave current is 100 A?

A) 7.07 A

B) 70.72 A

C) 100 A

D) 707.2 A

Hints:

from peak factor,

rms value = maximum value/1.41 = 100/1.41= 70.72 A

Your score is

The average score is 43%

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Electrical Notebook

2nd Semester

FEEE Unit-3.3 : Expressions of voltage and current through pure resistance, inductance and capacitance with sinusoidal excitation and phasor representation

Fundamentals of Electrical & Electronics Engineering

Diploma in Engineering & Technology

2nd Semester - Common to all branch

1 / 5

Category: Basic Electricity

1. For a sinusoidal AC voltage, amplitude factor is –

A) 0.637

B) 1.414

C) 1.11

D) 0.707

Hints:

Amplitude factor is another name of peak factor or crest factor which is 1.41 for sinusoidal ac voltage.

2 / 5

Category: AC Fundamental

2. In an AC circuit (Sine wave) with R and L in series –

A) The voltage across R leads the voltage across L by 90°

B) Voltage across R and L are in phase

C) Voltage across R and L 180o out of face

D) The voltage across R lags the voltage across L by 90°

3 / 5

Category: AC Fundamental

3. In a series R-C circuit, the applied voltage –

A) 90° lags the current

B) leads the current

C) 90° leads the current

D) lags the current

4 / 5

Category: AC Fundamental

4. In series R-L circuit power factor can be defined as –

A) All of these

B) P/S

C) R/Z

D) Vr/V

5 / 5

Category: AC Fundamental

5. In a R-L-C circuit, power loss takes place is –

A) C only

B) R only

C) L only

D) R-L-C all

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The average score is 31%

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2nd Semester

FEEE Unit-3.4 : Study of simple R-L, R-C, R-L-C series and parallel circuits with sinusoidal excitation and phasor representation

Fundamentals of Electrical & Electronics Engineering

Diploma in Engineering & Technology

2nd Semester - Common to all branch

1 / 5

Category: AC Fundamental

1. In series R-L circuit power factor can be defined as –

A) R/Z

B) Vr /V

C) P/S

D) All of the above

2 / 5

Category: AC Fundamental

2. In a R-L-C circuit, power loss takes place is –

A) L only

B) R only

C) R-L-C all

D) C only

3 / 5

Category: AC Fundamental

3. In an AC circuit (Sine wave) with R and L in series –

A) Voltage across R and L 180o out of face

B) The voltage across R leads the voltage across L by 90°

C) The voltage across R lags the voltage across L by 90°

D) Voltage across R and L are in phase

In an inductive circuit current always lag behind the voltage.

4 / 5

Category: AC Fundamental

4. For a sinusoidal AC voltage, amplitude factor is –

A) 1.414

B) 0.707

C) 0.637

D) 1.11

Amplitude factor or peak factor or crest factor is the ratio between maximum value of the ac quantity to the rms value of the same.

5 / 5

Category: AC Fundamental

5. In a series R-C circuit, the applied voltage –

A) leads the current

B) 90° lags the current

C) lags the current

D) 90° leads the current

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The average score is 49%

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Electrical Notebook

2nd Semester

FEEE Unit-3.5 : Concept of impedance, impedance triangle, power factor, active, reactive and apparent power, power triangle

Fundamentals of Electrical & Electronics Engineering

Diploma in Engineering & Technology

2nd Semester - Common to all branch

1 / 20

Category: Circuit Theory & Network

1. In any AC circuit always –

A) Reactive power is more than actual power

B) Reactive power is more than apparent power

C) Actual power is more than reactive power

D) Apparent power is more than actual power

2 / 20

Category: Circuit Theory & Network

2. The component of current which is in quadrature with supply voltage, is –

A) Active component of current

B) True component of current

C) none

D) Watt-less component of current

3 / 20

Category: Circuit Theory & Network

3. For a pure inductive circuit, the average demand of power from the source will be –

A) a very small amount

B) Maximum

C) Minimum

D) Zero

4 / 20

Category: Circuit Theory & Network

4. In a R-L-C series circuit, if the capacitive reactance is greater than the inductive reactance, then the power factor will be –

A) Leading

B) Lagging

C) Unity

D) Zero

5 / 20

Category: Circuit Theory & Network

5. What will be the Q-factor of a circuit, if power factor is 0.9?

A) 1

B) 1.111

C) 0.111

D) 0.81

Q factor is the reciprocal of the power factor

6 / 20

Category: Circuit Theory & Network

6. A parallel AC circuit in resonance will –

A) Act like a resister of low value

B) Have a high impedance

C) Have a high voltage developed across each inductive and capacitive section

D) Have current in each section equal to the line current

7 / 20

Category: Circuit Theory & Network

7. Which of the following will not be affected due to change in R?

A) None

B) Q

C) Resonant frequency

D) Bandwidth

Resonent frequency = 1/2π √(L/C)

8 / 20

Category: Circuit Theory & Network

8. In a R-L-C series circuit, if the inductive reactance is greater than the capacitive reactance, then the power factor will be –

A) Leading

B) Lagging

C) Unity

D) Zero

9 / 20

Category: AC Fundamental

9. Unit of impedance is

A) Ohm

B) Farad

C) Mho

D) Henry

10 / 20

Category: AC Fundamental

10. Reactive power is the product of

A) V, I

B) V, I, cos ø

C) V, I, tan ø

D) V, I, sin ø

11 / 20

Category: AC Fundamental

11. The alternative name/names for active power is/are –

A) all of the above

B) Real power

C) Average power

D) True power

12 / 20

Category: AC Fundamental

12. The power factor of an AC circuit lies between –

A) -1 and 1

B) 0 and -1

C) 0 and 1

D) None of these

13 / 20

Category: AC Fundamental

13. A pure capacitance connected across 50 Hz, 230 V supply consumes 0.04 W. This consumption is attributed to –

A) Capacitive reactance in ohms

B) Loss of energy in dielectric

C) Ohmic loss due to Ohmic resistance of plates

D) both A and B

14 / 20

Category: AC Fundamental

14. If the inductive reactance of a coil is 6 ohm and internal resistance is 8 ohm, then the impedance will be –

A) 10 ohm

B) 2 ohm

C) 14 ohm

D) 2 ohm

Z= √ (6^2+8^2) = 10 Ohm

15 / 20

Category: AC Fundamental

15. From the following when capacitive reactance will be more?

A) Capacitance & supply frequency is less

B) capacitance & supply frequency is more

C) capacitance is less & supply frequency is more

D) Capacitance is more & supply frequency is less

Xc= 1/2πfC

16 / 20

Category: AC Fundamental

16. In series R-L circuit power factor can be defined as -

A) Vr/V

B) All of the above

C) R/Z

D) Active Power (P)/Apparent Power (S)

17 / 20

Category: AC Fundamental

17. The power factor of an ordinary electric bulb is

A) Unity

B) Zero

C) Slightly less than unity

D) Slightly more than unity

Ordinary bulb means incandescent lamp or GLS lamp. The lamp glows on the basis of heating effect of resistance. The tungsten wire is used in coiled coil form in the bulb. Which is slightly inductive in nature, so the power factor is near about unity not purely unity, i.e. 0.98 to 0.99

18 / 20

Category: AC Fundamental

18. Capacitors for power factor correction are rated in -

A) VA

B) KVA

C) KW

D) KVAR

19 / 20

Category: AC Fundamental

19. The power factor of practical inductor is

A) Leading

B) Zero

C) Lagging

D) Unity

20 / 20

Category: Basic Electricity

20. When an alternating current passes through an Ohmic resistance the electrical power converted into heat is –

A) none of the above

B) Apparent power

C) Reactive power

D) True power

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2nd Semester

FEEE Unit-3.6 : Voltage and Current relationship in Star and Delta connections

Fundamentals of Electrical & Electronics Engineering

Diploma in Engineering & Technology

2nd Semester - Common to all branch

1 / 2

Category: Basic Electricity

1. Three nos 6-ohm resistances are connected in delta. Value of resistances if connected in star –

A) 2 ohm

B) 18 ohm

C) 6 ohm

D) 9 ohm

2 / 2

Category: AC Machines & Transformer

2. With the star delta starter the voltage across the motor winding at starting is –

A) 57.7%

B) 66.7%

C) 75%

D) 100%

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The average score is 38%

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Unit- 4 : Transformers and Machines

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2nd Semester

FEEE Unit- 4.1 : Transformer and Machines

Fundamentals of Electrical & Electronics Engineering

Diploma in Engineering & Technology

2nd Semester - Common for all branches

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2nd Semester

FEEE Unit-4.2 : General construction and principle of different type of transformers

Fundamentals of Electrical & Electronics Engineering

Diploma in Engineering & Technology

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2nd Semester

FEEE Unit-4.3 : EMF equation and transformation ratio of transformers

Fundamentals of Electrical & Electronics Engineering

Diploma in Engineering & Technology

2nd Semester - Common to all branch

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2nd Semester

FEEE Unit-4.4 : Auto-transformers

Fundamentals of Electrical & Electronics Engineering

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2nd Semester

FEEE Unit-4.5 : Construction and working principle of motors

Fundamentals of Electrical & Electronics Engineering

Diploma in Engineering & Technology

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2nd Semester

FEEE Unit-4.6 : Types of motors and applications

Fundamentals of Electrical & Electronics Engineering

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2nd Semester

FEEE Unit-4.7 : Simple problems on transformers and electrical machines

Fundamentals of Electrical & Electronics Engineering

Diploma in Engineering & Technology

2nd Semester - Common to all branch

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DC Machines & Transformer Quiz

Electrical Circuits Quiz

MCQs on Fundamental of Electrical & Electronics Engineering / 2nd Sem

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