MCQ Quiz on Fundamental of Electrical & Electronics Engineering

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Unit- 1 : Electric and Magnetic Circuits

/20

1 votes, 5 avg

325

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

A) a normal capacitor as in AC

B) a short circuit

C) a resistor

D) open circuit

2 / 20

Category: Basic Electricity

2. 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) All the three will glow

C) No bulb will glow

D) The other two lamps will glow

3 / 20

Category: Basic Electricity

3. Materials which easily allow the passage of electric current are known as ______

A) Dielectrics

B) Insulators

C) Semi-conductors

D) Conductors

4 / 20

Category: Basic Electricity

4. The expression for energy of an inductor

A) ½ LI

B) L/2I

C) ½ L^2.I

D) ½ LI^2

5 / 20

Category: Basic Electricity

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

A) Brown Black Golden Silver

B) Black Brown Black Golden

C) Black Brown Black Silver

D) Brown Black Golden Golden

6 / 20

Category: Basic Electricity

6. Which, among the following is a unit for resistivity?

A) ohm/meter^2

B) ohm-meter

C) ohm/meter

D) ohm-meter^2

7 / 20

Category: Basic Electricity

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

A) R= ρ. (a/l)

B) R=ρ. (l/a)

C) R= l/( ρ.a)

D) R= a/( ρ.l)

8 / 20

Category: Basic Electricity

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

A) 8 times

B) 16 times – of the previous

C) 4 times

D) 32 times

9 / 20

Category: Basic Electricity

9. Frequency of Direct Current is

A) 50 Hz

B) 50 kHz

C) 0 Hz

D) 40 Hz

10 / 20

Category: Basic Electricity

10. 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

11 / 20

Category: Basic Electricity

11. A wire of length 2m and another wire of length 5m are made up of the same material and have the same area of cross section, which wire has higher resistance?

A) The 2m wire has higher resistance

B) The 5m wire has higher resistance

C) Both have equal resistance

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

12 / 20

Category: Basic Electricity

12. The capacitor doesn’t allow sudden changes in

A) Capacitance

B) Resistance

C) Voltage

D) Current

13 / 20

Category: Basic Electricity

13. What is the resistivity of Copper?

A) 5.35×10^-8 ohm-m

B) 1.59×10^-8 ohm-m

C) 7.3×10^-8 ohm-m

D) 2.7×10^-8 ohm-m

14 / 20

Category: Basic Electricity

14. Which of the following statements are true with regard to resistance?

A) Resistance is inversely proportional to the length of the wire

B) Resistance is inversely proportional to the resistivity of the wire

C) Resistance is directly proportional to a length of the wire

D) Resistance is directly proportional to an area of cross section of the wire

15 / 20

Category: Basic Electricity

15. The reciprocal of resistivity is________

A) Resistance

B) Conductivity

C) Conductance

D) Impedance

16 / 20

Category: Basic Electricity

16. A 2 micro farad capacitor connected across 10 volt DC. Value of current is –

A) 5 A

B) Infinity

C) 0.2 A

D) 0 A

17 / 20

Category: Basic Electricity

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

A) Open

B) Short

C) Non-polar

D) Polar

18 / 20

Category: Basic Electricity

18. 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) 16 kiloohm-meter

B) 8 ohm-meter

C) 16 ohm-meter

D) 8 kilo 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.

19 / 20

Category: Basic Electricity

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

A) 60 J

B) 90 J

C) 20 J

D) 15 J

20 / 20

Category: Basic Electricity

20. If a capacitor of capacitance 9.2F has a voltage of 22.5V across it. Calculate the energy of the capacitor.

A) 5062.5 W

B) 50.625 W

C) 50625 W

D) 506.25 W

Apply E= ½ cv².

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

A) 1.5 mA

B) 10 mA

C) 15 mA

D) 1 mA

2 / 20

Category: Basic Electricity

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

A) 22.6 mA

B) 45.12 mA

C) 16 mA

D) 39.6 mA

3 / 20

Category: Basic Electricity

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

A) 13 V

B) None of the above

C) 6.5 V

D) 26 V

4 / 20

Category: Basic Electricity

4. 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

5 / 20

Category: Basic Electricity

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

A) 14.14 V

B) 25.48 V

C) 50.96 V

D) 6.37 V

6 / 20

Category: Basic Electricity

6. A 1 kHz signal has a period of 1 ms

A) False

B) True

7 / 20

Category: Basic Electricity

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

A) 2 μs

B) 20 μs

C) 100 μs

D) 4 μs

8 / 20

Category: Basic Electricity

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

A) True

B) False

9 / 20

Category: Basic Electricity

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

A) 50%

B) 25%

C) 1%

D) 100%

10 / 20

Category: Basic Electricity

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

A) 10 Hz

B) 1,000 Hz

C) 50 Hz

D) 100 Hz

Hints:

Frequency = 1/time period

11 / 20

Category: Basic Electricity

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

A) 400 Hz

B) 25,000 Hz

C) 2,500 Hz

D) 250 Hz

12 / 20

Category: Basic Electricity

12. The unit of frequency is the hertz

A) True

B) False

13 / 20

Category: Basic Electricity

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

A) 100%

B) 1%

C) 30%

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%

14 / 20

Category: Basic Electricity

14. 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) 40°

B) 0°

C) 45°

D) None of the above

15 / 20

Category: Basic Electricity

15. 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) 26.6 V

C) 2.66 V

D) 18.8 V

16 / 20

Category: Basic Electricity

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

A) False

B) True

17 / 20

Category: Basic Electricity

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

A) False

B) True

18 / 20

Category: Basic Electricity

18. A phasor represents

A) The width of a quantity

B) The phase angle

C) The magnitude of a quantity

D) The magnitude and a quantity direction

19 / 20

Category: Basic Electricity

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

A) True

B) False

20 / 20

Category: AC Fundamental

20. The length of a phasor represents the amplitude

A) True

B) False

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. Which is the most cost efficient connection?

A) Neither series nor parallel

B) Series

C) Parallel

D) Either series or parallel

2 / 16

Category: Basic Electricity

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

A) It becomes double its original value

B) It becomes infinity

C) It becomes half its original value

D) It becomes zero

3 / 16

Category: Basic Electricity

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

A) Parallel

B) Neither series nor parallel

C) Series

D) Either series or parallel

4 / 16

Category: Basic Electricity

4. If two bulbs are connected in parallel and one bulb 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 blows out as well

D) The other bulb stops glowing

5 / 16

Category: Basic Electricity

5. Many resistors connected in series will?

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

B) Divide the voltage proportionally among all the resistor

C) Reduce the power to zero

D) Divide the current proportionally

6 / 16

Category: Basic Electricity

6. Ideal voltage source has-

A) High internal resistance

B) Low internal resistance

C) Infinity internal resistance

D) Zero internal resistance

7 / 16

Category: Basic Electricity

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

A) Null

B) The value of the source voltage

C) Infinite

D) Zero

8 / 16

Category: Basic Electricity

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

A) Is zero for all resistors

B) The same for all resistors

C) Is divided proportionally across all resistors

D) Is divided equally among all resistors

9 / 16

Category: Basic Electricity

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

A) The other bulb stops glowing

B) The other bulb glows with increased brightness

C) The other bulb also burns out

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

10 / 16

Category: Basic Electricity

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

A) Either series or parallel

B) Series

C) Parallel

D) Neither series nor parallel

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) Neither voltage nor current

B) Voltage

C) Current

D) Both voltage and current

12 / 16

Category: Basic Electricity

12. Ideal voltage source has-

A) High internal resistance

B) Infinity internal resistance

C) Zero internal resistance

D) Low internal resistance

13 / 16

Category: Basic Electricity

13. Active circuit have -

A) one voltage source

B) either a or b

C) one current source

D) none of these

14 / 16

Category: Basic Electricity

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

A) The amount of time the circuit

B) Proportional to the value of the resistors

C) Equal in all branches

D) Proportional to the power in the circuit

15 / 16

Category: Basic Electricity

15. The energy per unit charge is

A) Work

B) Voltage

C) Current

D) Power

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

16 / 16

Category: Basic Electricity

16. Batteries are generally connected in______

A) Neither series nor parallel

B) Either series or parallel

C) Series

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

A) 15 ohm

B) 25 ohm

C) 75 ohm

D) 55 ohm

2 / 16

Category: Basic Electricity

2. 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) 12 A

C) Insufficient data provide

D) The largest one among the three values

Hints:

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

3 / 16

Category: Basic Electricity

3. Calculate the resistance between A and B

A) 14.26 ohm

B) 29.69 ohm

C) 7 ohm

D) 3.56 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.

4 / 16

Category: Basic Electricity

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

A) 7 ohm

B) 0 ohm

C) 0.48 ohm

D) 7.67 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.

5 / 16

Category: Basic Electricity

5. Calculate the current across the 20 ohm resistor

A) 20 A

B) 36.67 A

C) 10 A

D) 6.67 A

6 / 16

Category: Basic Electricity

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

A) 5 ohm

B) 27 ohm

C) 12 ohm

D) 135 ohm

Hints:

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

7 / 16

Category: Basic Electricity

7. The total resistance between A and B are?

A) 80 ohm

B) 20 ohm

C) 5 ohm

D) 0 ohm

8 / 16

Category: Basic Electricity

8. Voltage across the 60 ohm resistor is______

A) 48 V

B) 120 V

C) 0 V

D) 72 V

9 / 16

Category: Basic Electricity

9. Calculate the equivalent resistance between A and B

A) 12 ohm

B) 15 ohm

C) 48 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.

10 / 16

Category: Basic Electricity

10. Calculate the equivalent resistance between A and B

A) 6.67 ohm

B) 26.67 ohm

C) 46.67 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.

11 / 16

Category: Basic Electricity

11. The voltage across the short is?

A) Zero

B) Infinity

C) 135 V

D) 11.25 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.

12 / 16

Category: Basic Electricity

12. The voltage across the open circuit is?

A) Infinity

B) 100 V

C) 90 V

D) 0 V

13 / 16

Category: Basic Electricity

13. Find the current in the circuit.

A) 2 A

B) 4 A

C) 1 A

D) 3 A

14 / 16

Category: Basic Electricity

14. Calculate the equivalent resistance between A and B

A) 2 ohm

B) 8 ohm

C) 6 ohm

D) 4 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.

15 / 16

Category: Basic Electricity

15. Calculate the total current in the circuit

A) 11.43 A

B) 20 A

C) 15 A

D) 10 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.

16 / 16

Category: Basic Electricity

16. Find the voltage across the 6 ohm resistor

A) 150 V

B) 181.6 V

C) 54.48 V

D) 27.27 V

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: Magnetic Circuit

1. 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

2 / 13

Category: AC Fundamental

2. Average power taken by a pure capacitor is –

A) Zero

B) Minimum

C) Maximum

D) Unity

3 / 13

Category: Basic Electricity

3. 1 coulomb charge equals the charge of –

A) 6.24×10^-18 electrons

B) 6.24×10^16 electrons

C) 6.24×10^18 electrons

D) 6.24×10^12 electrons

4 / 13

Category: Basic Electricity

4. S.I unit of Power is –

A) Watt

B) Coulomb

C) Watt-hr

D) Joule

5 / 13

Category: Basic Electricity

5. KWh is the unit of -

A) Energy

B) Efficiency

C) Power

D) Work

6 / 13

Category: Basic Electricity

6. S.I unit of conductance is –

A) Mho-m

B) Ohm

C) Mho

D) Ohm-m

7 / 13

Category: Basic Electricity

7. Instantaneous power in inductor is proportional to the –

A) Square of rate of change of current

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

C) Temperature of the inductor

D) Square of instantaneous current

8 / 13

Category: Basic Electricity

8. Electric pressure is also called –

A) Resistance

B) Voltage

C) Energy

D) Conductance

9 / 13

Category: Basic Electricity

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

A) Ohmmeter

B) Voltmeter

C) Ammeter

D) Multimeter

10 / 13

Category: Basic Electricity

10. 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) all the three will glow

D) The other two lamps will glow

11 / 13

Category: Basic Electricity

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

A) electrons & ions

B) Atoms

C) positive charges

D) electrons

12 / 13

Category: Basic Electricity

12. Insulating material can –

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

B) Protect a short circuit between two conductors

C) Store varying voltage

D) Conduct very large current

13 / 13

Category: Basic Electricity

13. In case of D.C –

A) Magnitude of current changes with time

B) Magnitude and direction both change with time

C) Magnitude and direction remains constant

D) Direction of current changes with time

Your score is

The average score is 52%

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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: Magnetic Circuit

1. Magnetic field has -

A) none

B) only magnitude

C) Only direction

D) both magnitude & direction

2 / 20

Category: Magnetic Circuit

2. The unit of magnetic flux is –

A) Weber

B) Henry

C) Tesla

D) Ampere turns

3 / 20

Category: Magnetic Circuit

3. Paramagnetic materials are –

A) none

B) strongly repelled by a magnet

C) slightly attracted by a magnet

D) Strongly attracted by a magnet

4 / 20

Category: Magnetic Circuit

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

A) Tesla

B) WB/m²

C) Oersted

D) Both A & B

5 / 20

Category: Magnetic Circuit

5. S.I unit of Reluctance-

A) AT/m

B) AT/Wb

C) N/Wb

D) AT

6 / 20

Category: Magnetic Circuit

6. Hysteresis loss least depends on –

A) volume of material

B) ambient temperature

C) steinmetz coefficient of material

D) frequency

7 / 20

Category: Magnetic Circuit

7. Magnetic field strength is

A) N.ø/I

B) N.i

C) None of these

D) N.i / L

8 / 20

Category: Magnetic Circuit

8. Which of the following is unit less?

A) Permittivity

B) Permeability

C) Moment of Magnet

D) Magnetic susceptibility

9 / 20

Category: Magnetic Circuit

9. Magnetic circuit is a closed path followed by –

A) M.M.F

B) None of these

C) flux

D) Flux density

10 / 20

Category: Magnetic Circuit

10. In a electric circuit MMF is similar to

A) Resistance

B) Current

C) Flux

D) Electromotive force

11 / 20

Category: Magnetic Circuit

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

A) both a and c

B) Insulator

C) Multi turn coil

D) Solenoid

12 / 20

Category: Magnetic Circuit

12. The reciprocal of permeability is –

A) reluctivity

B) MMF

C) Conductivity

D) Resistivity

13 / 20

Category: Magnetic Circuit

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

A) Current

B) None

C) Emf

D) Voltage drop

14 / 20

Category: Magnetic Circuit

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

A) either b or c

B) Reluctance

C) number of turns in the circuit

D) Magnitude of current

15 / 20

Category: Magnetic Circuit

15. Magnetic lines of forces –

A) often intersect

B) never intersect

C) are not predictable

D) intersect only in some special circumstances

16 / 20

Category: Magnetic Circuit

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

A) its high retentivity

B) molecular friction

C) flux density lagging behind magnetising force

D) rapid reversals of its magnetisation

17 / 20

Category: Magnetic Circuit

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

A) Electromagnets

B) Electromagnetic fields

C) Electric magnets

D) Electromagnetism field

18 / 20

Category: Magnetic Circuit

18. Magnetic field is proportional to the –

A) Speed of electric charges

B) all of these

C) direction of electric charges

D) Quality of electric charges

19 / 20

Category: Basic Electricity

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

A) Low

B) high

C) unity

D) zero

20 / 20

Category: AC Fundamental

20. Absolute permittivity of dielectric medium is represented as –

A) ε0

B) ε0 εr

C) εr

D) εr /ε0

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) Faraday

B) Orsted

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) Faraday

B) Newton

C) Lenz

D) Coulomb

3 / 4

Category: Magnetic Circuit

3. An open coil has –

A) Zero resistance and high inductance

B) Infinite resistance and normal inductance

C) Zero resistance and inductance

D) Infinite resistance and zero inductance

4 / 4

Category: Magnetic Circuit

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

A) Produce current opposite to the increasing current

B) Aid the increasing current

C) Tend to decrease the amount of current

D) Aid the applied voltage

Your score is

The average score is 59%

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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) none

B) D.C supply only

C) A.C supply only

D) both A.C and D.C supply

2 / 6

Category: DC Machines

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

A) Generator

B) Thermo-couple

C) Transformer

D) Choke

3 / 6

Category: AC Machines & Transformer

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

A) Battery

B) Generator

C) Transformer

D) Motor

4 / 6

Category: AC Fundamental

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

A) Low impedance

B) High capacitance

C) High impedance

D) High Inductance

5 / 6

Category: Magnetic Circuit

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

A) Rate of change of flux

B) None

C) Flux magnitude

D) Coil resistance

6 / 6

Category: Magnetic Circuit

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

A) Self-inductance

B) Capacitance

C) None

D) Mutual inductance

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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) Lesser its Weber-turns

B) Greater the flux produced by it

C) lower the E.M.F. induced

D) longer the delay in establishing steady current through it

2 / 12

Category: Magnetic Circuit

2. 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) quadrupled

C) Unaffected

D) doubled

3 / 12

Category: Magnetic Circuit

3. 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) decrease

D) Increase

4 / 12

Category: Magnetic Circuit

4. 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) 220 J

B) 150 J

C) 190 J

D) 160 J

Hints:

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

5 / 12

Category: Magnetic Circuit

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

A) 5 V

B) 2.5 V

C) 1.5 V

D) 3.5 V

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

6 / 12

Category: Magnetic Circuit

6. 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) 0

B) I/2

C) I/4

D) I

7 / 12

Category: Magnetic Circuit

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

A) L^2 I / 2

B) LI^2 / 2

C) LI^2

D) IL^2

8 / 12

Category: Magnetic Circuit

8. 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) 60 J

D) 90 J

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

9 / 12

Category: Magnetic Circuit

9. 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) 0

B) I/4

C) I/2

D) I

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

10 / 12

Category: Magnetic Circuit

10. 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) L / 2I^2 t

B) L / 2It

C) LI / 2t

D) LI^2/ 2t

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

11 / 12

Category: AC Fundamental

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

A) none

B) electric field

C) Magnetic field

D) both a and b

12 / 12

Category: AC Fundamental

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

A) Q^2 / 2C

B) 1/2 CV^2

C) All of the above

D) 1/2 QV

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The average score is 51%

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Electrical Notebook

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 motor is found out by

A) Flemmings Left hand rule

B) Pulm rule

C) Left hand thumb rule

D) Flemmings Right hand rule

2 / 5

Category: DC Machines

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

A) Flemmings Left hand rule

B) Left hand thumb rule

C) Flemmings Right hand rule

D) Palm rule

3 / 5

Category: Magnetic Circuit

3. 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) Fleming's Right Hand Rule

C) Faraday's Right Hand Rule

D) Fleming's Left Hand Rule

4 / 5

Category: Magnetic Circuit

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

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

D) The piece of metal will lose it magnetism

5 / 5

Category: Magnetic Circuit

5. A magnetic field like this is called –

A) a paramagnetic field

B) A uniform field

C) a distorted field

D) A parallel field

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The average score is 43%

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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) 0.05 kWh

B) 0.005 kWh

C) 5 kWh

D) 0.05 Wh

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) 4 kWh

B) 5 kWh

C) 1 kWh

D) 2 kWh

Hints:

Input= 4 kWh+20% = 5 kWh

Your score is

The average score is 36%

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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. Capacitive Susceptance is a measure of –

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

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

C) Reactive power in a circuit

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

2 / 20

Category: AC Fundamental

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

A) Current

B) Heating effect

C) Charge transfer

D) Voltage

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 double the frequency

C) A sinusoid of half the original frequency

D) Not a sinusoid

4 / 20

Category: AC Fundamental

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

A) Direction only

B) Both magnitude and direction

C) None

D) Magnitude only

5 / 20

Category: AC Fundamental

5. Form factor of half wave rectified ac is-

A) 1.57

B) 1.11

C) 1.41

D) 2

6 / 20

Category: AC Fundamental

6. An alternating voltage is given by, V = 10 sin 2πt. The frequency of the AC signal is –

A) π Hz

B) 2π Hz

C) 1 Hz

D) None

Hints:

v= Vm sin 2πft volt

here f=1 Hz

7 / 20

Category: AC Fundamental

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

A) All of these

B) C only

C) L only

D) R only

8 / 20

Category: AC Fundamental

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

A) Charge transfer

B) Voltage

C) Heating effect

D) Current

9 / 20

Category: AC Fundamental

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

A) 5 Hz

B) 20 Hz

C) 30 Hz

D) 50 Hz

10 / 20

Category: AC Fundamental

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

A) 127.4 V

B) 141.4 V

C) 200 V

D) 282.8 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

11 / 20

Category: AC Fundamental

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

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

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

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

D) None

12 / 20

Category: AC Fundamental

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

A) Current

B) Voltage

C) Charge transfers

D) Heating effect

13 / 20

Category: AC Fundamental

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

A) 1

B) 1.11

C) 0.707

D) 1.41

14 / 20

Category: AC Fundamental

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

A) 90°

B) 360°

C) 180°

D) 0°

15 / 20

Category: AC Fundamental

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

A) 25 π

B) 5 π

C) 50 π

D) 100 π

Hints:

Angular frequency = 2πf rad/sec = 100π

16 / 20

Category: AC Fundamental

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

A) 150 A

B) 141 A

C) 282.8 A

D) 70.7 A

Hints: Peak factor of sine wave = 1.41

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

17 / 20

Category: AC Fundamental

17. Form factor of square wave is-

A) 2

B) 1

C) 1.47

D) 1.41

18 / 20

Category: AC Fundamental

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

A) 0.707

B) 1.11

C) 1.414

D) 0.637

Hints:

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

19 / 20

Category: AC Fundamental

19. The frequency of an alternating current is –

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

B) The speed with which the alternator runs

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

D) The number of cycles generated in one minute

20 / 20

Category: AC Fundamental

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

A) Average voltage

B) RMS voltage

C) None

D) Peak voltage

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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: Basic Electricity

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

A) 100 A

B) 7.07 A

C) 707.2 A

D) 70.72 A

Hints:

from peak factor,

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

2 / 4

Category: AC Fundamental

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

A) 0.01 sec

B) 0.06 sec

C) 0.04 sec

D) 0.05 sec

Hints:

2πf= 628

f=628/2π = 99.94 Hz

t= 1/f = 0.01 sec

3 / 4

Category: AC Fundamental

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

A) 100 Hz

B) 50 Hz

C) 75 Hz

D) 314 Hz

4 / 4

Category: AC Fundamental

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

A) 50 Hz

B) None

C) 60 Hz

D) 25 Hz

Hints:

2πf = 314

f= 314/2π = 49.97 Hz = 50 Hz

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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) 1.414

B) 0.707

C) 1.11

D) 0.637

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

A) R/Z

B) Vr/V

C) P/S

D) All of these

3 / 5

Category: AC Fundamental

3. 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

4 / 5

Category: AC Fundamental

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

A) 90° lags the current

B) lags the current

C) 90° leads the current

D) leads the current

5 / 5

Category: AC Fundamental

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

A) Voltage across R and L are in phase

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

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

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

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The average score is 31%

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Electrical Notebook

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

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

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

C) Voltage across R and L are in phase

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

In an inductive circuit current always lag behind the voltage.

2 / 5

Category: AC Fundamental

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

A) R only

B) C only

C) L only

D) R-L-C all

3 / 5

Category: AC Fundamental

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

A) All of the above

B) P/S

C) R/Z

D) Vr /V

4 / 5

Category: AC Fundamental

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

A) 0.637

B) 1.414

C) 1.11

D) 0.707

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) 90° leads the current

B) lags the current

C) leads the current

D) 90° lags 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: Basic Electricity

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

A) Reactive power

B) Apparent power

C) none of the above

D) True power

2 / 20

Category: AC Fundamental

2. The power factor of an ordinary electric bulb is

A) Unity

B) Zero

C) Slightly more than unity

D) Slightly less 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

3 / 20

Category: AC Fundamental

3. The power factor of practical inductor is

A) Lagging

B) Leading

C) Zero

D) Unity

4 / 20

Category: AC Fundamental

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

A) Average power

B) all of the above

C) Real power

D) True power

5 / 20

Category: AC Fundamental

5. Reactive power is the product of

A) V, I, cos ø

B) V, I, sin ø

C) V, I

D) V, I, tan ø

6 / 20

Category: AC Fundamental

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

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

B) R/Z

C) All of the above

D) Vr/V

7 / 20

Category: AC Fundamental

7. Capacitors for power factor correction are rated in -

A) KW

B) KVA

C) VA

D) KVAR

8 / 20

Category: AC Fundamental

8. In an AC circuit a low value of KVAR compared with KW indicates –

A) Maximum load current

B) Unity power factor

C) Low efficiency

D) High power factor

Power factor=KW/KVA. High value of KW means higher power factor.

9 / 20

Category: AC Fundamental

9. Unit of impedance is

A) Henry

B) Mho

C) Ohm

D) Farad

10 / 20

Category: AC Fundamental

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

A) Ohmic loss due to Ohmic resistance of plates

B) both A and B

C) Capacitive reactance in ohms

D) Loss of energy in dielectric

11 / 20

Category: AC Fundamental

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

A) 2 ohm

B) 10 ohm

C) 2 ohm

D) 14 ohm

Z= √ (6^2+8^2) = 10 Ohm

12 / 20

Category: AC Fundamental

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

A) None of these

B) -1 and 1

C) 0 and 1

D) 0 and -1

13 / 20

Category: AC Fundamental

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

A) Capacitance & supply frequency is less

B) Capacitance is more & supply frequency is less

C) capacitance & supply frequency is more

D) capacitance is less & supply frequency is more

Xc= 1/2πfC

14 / 20

Category: AC Fundamental

14. An electric incandescent lamp has the power factor of –

A) leading

B) unity

C) Lagging

D) zero

15 / 20

Category: Circuit Theory & Network

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

A) Resonant frequency

B) Q

C) Bandwidth

D) None

Resonent frequency = 1/2π √(L/C)

16 / 20

Category: Circuit Theory & Network

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

A) Zero

B) Unity

C) Lagging

D) Leading

17 / 20

Category: Circuit Theory & Network

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

A) a very small amount

B) Maximum

C) Zero

D) Minimum

18 / 20

Category: Circuit Theory & Network

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

A) 0.81

B) 1.111

C) 0.111

D) 1

Q factor is the reciprocal of the power factor

19 / 20

Category: Circuit Theory & Network

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

A) Active component of current

B) none

C) Watt-less component of current

D) True component of current

20 / 20

Category: Circuit Theory & Network

20. In any AC circuit always –

A) Apparent power is more than actual power

B) Reactive power is more than actual power

C) Actual power is more than reactive power

D) Reactive power is more than apparent 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: AC Machines & Transformer

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

A) 66.7%

B) 57.7%

C) 75%

D) 100%

2 / 2

Category: Basic Electricity

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

A) 18 ohm

B) 9 ohm

C) 6 ohm

D) 2 ohm

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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

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2nd Semester

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

Fundamentals of Electrical & Electronics Engineering

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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

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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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