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. Unit of resistivity is

A) Ohm-m

B) Ohm/m

C) Ohm

D) Ohm-m²

2 / 20

Category: Basic Electricity

2. If the voltage across a capacitor is constant, then current passing through it is ________

A) -1

B) 1

C) Infinity

D) 0

Hints: I= c.(dv/dt)

3 / 20

Category: Basic Electricity

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

A) Conductors

B) Dielectrics

C) Semi-conductors

D) Insulators

4 / 20

Category: Basic Electricity

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

A) ohm/meter

B) ohm-meter^2

C) ohm/meter^2

D) ohm-meter

5 / 20

Category: Basic Electricity

5. The formula used to find the capacitance C is __________

A) Q-v

B) Qv

C) Q/v

D) Q + v

6 / 20

Category: Basic Electricity

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

A) 32 times

B) 4 times

C) 16 times

D) 8 times

7 / 20

Category: Basic Electricity

7. The units for inductance is _________ and capacitance is ___________

A) Faraday, Henry

B) Henry, Faraday

C) Coulomb, Faraday

D) Henry, Coulomb

8 / 20

Category: Basic Electricity

8. 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) The 15 sqm wire has higher resistance

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

D) Both have equal resistance

9 / 20

Category: Basic Electricity

9. 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) Inversely proportionate with length and cross sectional area

D) Directly proportionate with length and cross sectional area

10 / 20

Category: Basic Electricity

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

A) 20 J

B) 90 J

C) 60 J

D) 15 J

11 / 20

Category: Basic Electricity

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

A) R= a/( ρ.l)

B) R= l/( ρ.a)

C) R=ρ. (l/a)

D) R= ρ. (a/l)

12 / 20

Category: Basic Electricity

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

A) open circuit

B) a resistor

C) a short circuit

D) a normal capacitor as in AC

13 / 20

Category: Basic Electricity

13. 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 ohm-meter

B) 8 ohm-meter

C) 16 kiloohm-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.

14 / 20

Category: Basic Electricity

14. Frequency of Direct Current is

A) 0 Hz

B) 50 Hz

C) 50 kHz

D) 40 Hz

15 / 20

Category: Basic Electricity

15. In a pure inductive circuit current is

A) Leads by voltage by 90°

B) Lags behind Voltage by 90°

C) Lags by voltage by 0°

D) Leads by voltage by 0°

16 / 20

Category: Basic Electricity

16. What is the resistivity of Copper?

A) 1.59×10^-8 ohm-m

B) 7.3×10^-8 ohm-m

C) 5.35×10^-8 ohm-m

D) 2.7×10^-8 ohm-m

17 / 20

Category: Basic Electricity

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

A) Open circuit

B) A normal capacitor as in AC

C) A short circuit

D) A resistor

18 / 20

Category: Basic Electricity

18. The Inductor doesn’t allow sudden changes in

A) Current

B) Resistance

C) Voltage

D) Inductance

19 / 20

Category: Basic Electricity

19. The expression for energy of an inductor

A) ½ LI^2

B) L/2I

C) ½ L^2.I

D) ½ LI

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) 506.25 W

B) 50625 W

C) 5062.5 W

D) 50.625 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. Amplitude is the maximum value of a voltage or current

A) True

B) False

2 / 20

Category: Basic Electricity

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

A) 50.96 V

B) 6.37 V

C) 25.48 V

D) 14.14 V

3 / 20

Category: Basic Electricity

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

A) 15 mA

B) 1.5 mA

C) 1 mA

D) 10 mA

4 / 20

Category: Basic Electricity

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

A) 30%

B) 1%

C) 100%

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%

5 / 20

Category: Basic Electricity

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

A) 100 μs

B) 20 μs

C) 2 μs

D) 4 μs

6 / 20

Category: Basic Electricity

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

A) 100 Hz

B) 10 Hz

C) 1,000 Hz

D) 50 Hz

Hints:

Frequency = 1/time period

7 / 20

Category: Basic Electricity

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

A) 12 cycles

B) 1,200 cycles

C) 1/100 cycle

D) 120 cycles

8 / 20

Category: Basic Electricity

8. The unit of frequency is the hertz

A) True

B) False

9 / 20

Category: Basic Electricity

9. A phasor represents

A) The width of a quantity

B) The magnitude and a quantity direction

C) The magnitude of a quantity

D) The phase angle

10 / 20

Category: Basic Electricity

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

A) True

B) False

11 / 20

Category: Basic Electricity

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

A) 25,000 Hz

B) 400 Hz

C) 2,500 Hz

D) 250 Hz

12 / 20

Category: Basic Electricity

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

A) False

B) True

13 / 20

Category: Basic Electricity

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

A) False

B) True

14 / 20

Category: Basic Electricity

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

A) 45.12 mA

B) 22.6 mA

C) 39.6 mA

D) 16 mA

15 / 20

Category: Basic Electricity

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

A) 6°

B) 180°

C) 60°

D) 27°

16 / 20

Category: Basic Electricity

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

A) 26.6 V

B) 4 V

C) 18.8 V

D) 2.66 V

17 / 20

Category: Basic Electricity

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

A) 6.5 V

B) None of the above

C) 26 V

D) 13 V

18 / 20

Category: Basic Electricity

18. 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%

19 / 20

Category: Basic Electricity

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

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. Active circuit have -

A) one current source

B) one voltage source

C) none of these

D) either a or b

2 / 16

Category: Basic Electricity

2. Ideal voltage source has-

A) High internal resistance

B) Zero internal resistance

C) Infinity internal resistance

D) Low internal resistance

3 / 16

Category: Basic Electricity

3. Batteries are generally connected in______

A) Parallel

B) Neither series nor parallel

C) Either series or parallel

D) Series

4 / 16

Category: Basic Electricity

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

A) The other bulb also burns out

B) The other bulb glows with increased brightness

C) The other bulb stops glowing

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

5 / 16

Category: Basic Electricity

5. Ideal voltage source has-

A) Low internal resistance

B) Infinity internal resistance

C) High internal resistance

D) Zero internal resistance

6 / 16

Category: Basic Electricity

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

A) Infinite

B) The value of the source voltage

C) Zero

D) Null

7 / 16

Category: Basic Electricity

7. 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) Divide the current proportionally

D) Reduce the power to zero

8 / 16

Category: Basic Electricity

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

A) Series

B) Either series or parallel

C) Parallel

D) Neither series nor parallel

9 / 16

Category: Basic Electricity

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

A) Current

B) Neither voltage nor current

C) Both voltage and current

D) Voltage

10 / 16

Category: Basic Electricity

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

A) Proportional to the power in the circuit

B) Equal in all branches

C) The amount of time the circuit

D) Proportional to the value of the resistors

11 / 16

Category: Basic Electricity

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

A) Is divided proportionally across all resistors

B) Is zero for all resistors

C) The same for all resistors

D) Is divided equally among all resistors

12 / 16

Category: Basic Electricity

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

A) It becomes half its original value

B) It becomes zero

C) It becomes infinity

D) It becomes double its original value

13 / 16

Category: Basic Electricity

13. Which is the most cost efficient connection?

A) Series

B) Either series or parallel

C) Parallel

D) Neither series nor parallel

14 / 16

Category: Basic Electricity

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

A) Parallel

B) Either series or parallel

C) Series

D) Neither series nor parallel

15 / 16

Category: Basic Electricity

15. The energy per unit charge is

A) Voltage

B) Current

C) Power

D) Work

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

16 / 16

Category: Basic Electricity

16. 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

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. The voltage across the short is?

A) 11.25 V

B) 135 V

C) Zero

D) Infinity

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.

2 / 16

Category: Basic Electricity

2. 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.

3 / 16

Category: Basic Electricity

3. Calculate the current across the 20 ohm resistor

A) 6.67 A

B) 20 A

C) 36.67 A

D) 10 A

4 / 16

Category: Basic Electricity

4. Calculate the equivalent resistance between A and B

A) 48 ohm

B) 15 ohm

C) 12 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.

5 / 16

Category: Basic Electricity

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

A) 7.67 ohm

B) 7 ohm

C) 0 ohm

D) 0.48 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.

6 / 16

Category: Basic Electricity

6. Voltage across the 60 ohm resistor is______

A) 0 V

B) 72 V

C) 48 V

D) 120 V

7 / 16

Category: Basic Electricity

7. Calculate the equivalent resistance between A and B

A) 46.67 ohm

B) 6.67 ohm

C) 10.67 ohm

D) 26.67 ohm

Hints:

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

8 / 16

Category: Basic Electricity

8. Find the voltage across the 6 ohm resistor

A) 54.48 V

B) 27.27 V

C) 150 V

D) 181.6 V

9 / 16

Category: Basic Electricity

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

A) 55 ohm

B) 15 ohm

C) 75 ohm

D) 25 ohm

10 / 16

Category: Basic Electricity

10. 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) 12 A

B) 0 A

C) The largest one among the three values

D) Insufficient data provide

Hints:

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

11 / 16

Category: Basic Electricity

11. Calculate the resistance between A and B

A) 14.26 ohm

B) 3.56 ohm

C) 29.69 ohm

D) 7 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.

12 / 16

Category: Basic Electricity

12. 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.

13 / 16

Category: Basic Electricity

13. The total resistance between A and B are?

A) 20 ohm

B) 80 ohm

C) 0 ohm

D) 5 ohm

14 / 16

Category: Basic Electricity

14. Calculate the total current in the circuit

A) 20 A

B) 10 A

C) 11.43 A

D) 15 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.

15 / 16

Category: Basic Electricity

15. The voltage across the open circuit is?

A) 100 V

B) Infinity

C) 0 V

D) 90 V

16 / 16

Category: Basic Electricity

16. Find the current in the circuit.

A) 3 A

B) 2 A

C) 1 A

D) 4 A

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. Electric pressure is also called –

A) Energy

B) Voltage

C) Resistance

D) Conductance

2 / 13

Category: Basic Electricity

2. S.I unit of Power is –

A) Coulomb

B) Watt-hr

C) Watt

D) Joule

3 / 13

Category: Basic Electricity

3. S.I unit of conductance is –

A) Mho

B) Ohm-m

C) Ohm

D) Mho-m

4 / 13

Category: Basic Electricity

4. Insulating material can –

A) Conduct very large current

B) Store varying voltage

C) Protect a short circuit between two conductors

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

5 / 13

Category: Basic Electricity

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

A) electrons

B) electrons & ions

C) Atoms

D) positive charges

6 / 13

Category: Basic Electricity

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

A) all the three will glow

B) The other two lamps will glow

C) no bulb will glow

D) Total current in the circuit will increase

7 / 13

Category: Basic Electricity

7. 1 coulomb charge equals the charge of –

A) 6.24×10^-18 electrons

B) 6.24×10^12 electrons

C) 6.24×10^16 electrons

D) 6.24×10^18 electrons

8 / 13

Category: Basic Electricity

8. In case of D.C –

A) Magnitude of current changes with time

B) Magnitude and direction remains constant

C) Direction of current changes with time

D) Magnitude and direction both change with time

9 / 13

Category: Basic Electricity

9. Instantaneous power in inductor is proportional to the –

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

B) Square of instantaneous current

C) Square of rate of change of current

D) Temperature of the inductor

10 / 13

Category: Basic Electricity

10. KWh is the unit of -

A) Energy

B) Work

C) Power

D) Efficiency

11 / 13

Category: Basic Electricity

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

A) Voltmeter

B) Multimeter

C) Ohmmeter

D) Ammeter

12 / 13

Category: Magnetic Circuit

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

A) voltage

B) Electromotive difference

C) Magnetomotive force

D) Electromotive force

13 / 13

Category: AC Fundamental

13. Average power taken by a pure capacitor is –

A) Minimum

B) Unity

C) Maximum

D) Zero

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

B) εr /ε0

C) ε0

D) ε0 εr

2 / 20

Category: Basic Electricity

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

A) zero

B) unity

C) high

D) Low

3 / 20

Category: Magnetic Circuit

3. Magnetic field strength is

A) N.i / L

B) None of these

C) N.i

D) N.ø/I

4 / 20

Category: Magnetic Circuit

4. Hysteresis loss least depends on –

A) frequency

B) volume of material

C) steinmetz coefficient of material

D) ambient temperature

5 / 20

Category: Magnetic Circuit

5. In a electric circuit MMF is similar to

A) Flux

B) Current

C) Resistance

D) Electromotive force

6 / 20

Category: Magnetic Circuit

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

A) Current

B) None

C) Voltage drop

D) Emf

7 / 20

Category: Magnetic Circuit

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

A) rapid reversals of its magnetisation

B) molecular friction

C) its high retentivity

D) flux density lagging behind magnetising force

8 / 20

Category: Magnetic Circuit

8. The reciprocal of permeability is –

A) MMF

B) Conductivity

C) reluctivity

D) Resistivity

9 / 20

Category: Magnetic Circuit

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

A) Electric magnets

B) Electromagnetic fields

C) Electromagnets

D) Electromagnetism field

10 / 20

Category: Magnetic Circuit

10. The unit of magnetic flux is –

A) Ampere turns

B) Weber

C) Tesla

D) Henry

11 / 20

Category: Magnetic Circuit

11. Magnetic field has -

A) none

B) only magnitude

C) both magnitude & direction

D) Only direction

12 / 20

Category: Magnetic Circuit

12. Magnetic circuit is a closed path followed by –

A) flux

B) Flux density

C) None of these

D) M.M.F

13 / 20

Category: Magnetic Circuit

13. Magnetic lines of forces –

A) often intersect

B) are not predictable

C) intersect only in some special circumstances

D) never intersect

14 / 20

Category: Magnetic Circuit

14. Which of the following is unit less?

A) Moment of Magnet

B) Permeability

C) Magnetic susceptibility

D) Permittivity

15 / 20

Category: Magnetic Circuit

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

A) Multi turn coil

B) Solenoid

C) both a and c

D) Insulator

16 / 20

Category: Magnetic Circuit

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

A) Both A & B

B) Oersted

C) Tesla

D) WB/m²

17 / 20

Category: Magnetic Circuit

17. Magnetic field is proportional to the –

A) Quality of electric charges

B) Speed of electric charges

C) direction of electric charges

D) all of these

18 / 20

Category: Magnetic Circuit

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

A) Reluctance

B) either b or c

C) number of turns in the circuit

D) Magnitude of current

19 / 20

Category: Magnetic Circuit

19. Paramagnetic materials are –

A) none

B) strongly repelled by a magnet

C) slightly attracted by a magnet

D) Strongly attracted by a magnet

20 / 20

Category: Magnetic Circuit

20. S.I unit of Reluctance-

A) N/Wb

B) AT/Wb

C) AT/m

D) AT

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) Edison

C) Flemmings

D) Faraday

2 / 4

Category: Magnetic Circuit

2. An open coil has –

A) Infinite resistance and normal inductance

B) Zero resistance and high inductance

C) Infinite resistance and zero inductance

D) Zero resistance and inductance

3 / 4

Category: Magnetic Circuit

3. 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

4 / 4

Category: Magnetic Circuit

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

A) Faraday

B) Coulomb

C) Newton

D) Lenz

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: Magnetic Circuit

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

A) Coil resistance

B) Flux magnitude

C) None

D) Rate of change of flux

2 / 6

Category: Magnetic Circuit

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

A) Capacitance

B) None

C) Self-inductance

D) Mutual inductance

3 / 6

Category: AC Fundamental

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

A) High impedance

B) Low impedance

C) High Inductance

D) High capacitance

4 / 6

Category: Basic Electricity

4. Electrolysis is possible with –

A) none

B) both A.C and D.C supply

C) D.C supply only

D) A.C supply only

5 / 6

Category: DC Machines

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

A) Thermo-couple

B) Transformer

C) Generator

D) Choke

6 / 6

Category: AC Machines & Transformer

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

A) Battery

B) Generator

C) Motor

D) Transformer

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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. 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) I/2

C) 0

D) I/4

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

2 / 12

Category: Magnetic Circuit

2. 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

3 / 12

Category: Magnetic Circuit

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

A) 2.5 V

B) 1.5 V

C) 5 V

D) 3.5 V

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

4 / 12

Category: Magnetic Circuit

4. 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/4

B) I

C) 0

D) I/2

5 / 12

Category: Magnetic Circuit

5. 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) LI^2/ 2t

C) LI / 2t

D) L / 2It

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

6 / 12

Category: Magnetic Circuit

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

A) LI^2 / 2

B) IL^2

C) L^2 I / 2

D) LI^2

7 / 12

Category: Magnetic Circuit

7. 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

8 / 12

Category: Magnetic Circuit

8. Higher the self-inductance of a coil –

A) Greater the flux produced by it

B) Lesser its Weber-turns

C) longer the delay in establishing steady current through it

D) lower the E.M.F. induced

9 / 12

Category: Magnetic Circuit

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

A) doubled

B) halved

C) Unaffected

D) quadrupled

10 / 12

Category: Magnetic Circuit

10. 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) 220 J

C) 160 J

D) 150 J

Hints:

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

11 / 12

Category: AC Fundamental

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

A) both a and b

B) Magnetic field

C) none

D) electric field

12 / 12

Category: AC Fundamental

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

A) All of the above

B) Q^2 / 2C

C) 1/2 QV

D) 1/2 CV^2

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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: Magnetic Circuit

1. 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) The piece of metal will lose it magnetism

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

2 / 5

Category: Magnetic Circuit

2. A magnetic field like this is called –

A) A parallel field

B) a paramagnetic field

C) a distorted field

D) A uniform field

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 Right Hand Rule

B) Fleming's Left Hand Rule

C) Faraday's Left Hand Rule

D) Fleming's Right Hand Rule

4 / 5

Category: DC Machines

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

A) Left hand thumb rule

B) Flemmings Left hand rule

C) Flemmings Right hand rule

D) Pulm rule

5 / 5

Category: DC Machines

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

A) Left hand thumb rule

B) Flemmings Right hand rule

C) Flemmings Left hand rule

D) Palm rule

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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. 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) 2 kWh

B) 5 kWh

C) 4 kWh

D) 1 kWh

Hints:

Input= 4 kWh+20% = 5 kWh

2 / 2

Category: Basic Electricity

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

A) 0.05 kWh

B) 0.05 Wh

C) 5 kWh

D) 0.005 kWh

Hints:

Energy consumed = Power x time = 100 x 0.5 = 50 Wh = 0.05 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. If two sinusoids of the same frequency but of different amplitudes and phase angles are subtracted, the resultant is –

A) A sinusoid of double the frequency

B) A sinusoid of half the original frequency

C) A sinusoid of the same frequency

D) Not a sinusoid

2 / 20

Category: AC Fundamental

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

A) 1.41

B) 1

C) 0.707

D) 1.11

3 / 20

Category: AC Fundamental

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

A) Voltage

B) Charge transfers

C) Current

D) Heating effect

4 / 20

Category: AC Fundamental

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

A) Charge transfer

B) Heating effect

C) Current

D) Voltage

5 / 20

Category: AC Fundamental

5. Capacitive Susceptance is a measure of –

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

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

C) Reactive power in a circuit

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

6 / 20

Category: AC Fundamental

6. Form factor of square wave is-

A) 2

B) 1

C) 1.41

D) 1.47

7 / 20

Category: AC Fundamental

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

A) 0°

B) 90°

C) 180°

D) 360°

8 / 20

Category: AC Fundamental

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

A) None

B) 1 Hz

C) 2π Hz

D) π Hz

Hints:

v= Vm sin 2πft volt

here f=1 Hz

9 / 20

Category: AC Fundamental

9. From heating point of view I_D.C. is equal to –

A) I max Lm value

B) I average value

C) None

D) I R.M.S.

10 / 20

Category: AC Fundamental

10. Form factor of half wave rectified ac is-

A) 2

B) 1.11

C) 1.57

D) 1.41

11 / 20

Category: AC Fundamental

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

A) 0.637

B) 1.414

C) 0.707

D) 1.11

Hints:

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

12 / 20

Category: AC Fundamental

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

A) Peak voltage

B) Average voltage

C) None

D) RMS voltage

13 / 20

Category: AC Fundamental

13. 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 less than average value

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

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

14 / 20

Category: AC Fundamental

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

A) 141 A

B) 282.8 A

C) 150 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

15 / 20

Category: AC Fundamental

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

A) Charge transfer

B) Voltage

C) Heating effect

D) Current

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) 50 Hz

C) 20 Hz

D) 30 Hz

17 / 20

Category: AC Fundamental

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

A) 100 π

B) 25 π

C) 5 π

D) 50 π

Hints:

Angular frequency = 2πf rad/sec = 100π

18 / 20

Category: AC Fundamental

18. The frequency of an alternating current is –

A) The number of cycles generated in one minute

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

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

D) The speed with which the alternator runs

19 / 20

Category: AC Fundamental

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

A) 127.4 V

B) 200 V

C) 141.4 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

20 / 20

Category: AC Fundamental

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

A) Resistance and Reactance

B) Reluctance and Permeance

C) Conductance, Susceptance

D) Permeance and Susceptance

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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) 7.07 A

B) 100 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 frequency of an AC voltage,e= 100 cos 314t , will be –

A) 25 Hz

B) 50 Hz

C) 60 Hz

D) None

Hints:

2πf = 314

f= 314/2π = 49.97 Hz = 50 Hz

3 / 4

Category: AC Fundamental

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

A) 0.04 sec

B) 0.01 sec

C) 0.05 sec

D) 0.06 sec

Hints:

2πf= 628

f=628/2π = 99.94 Hz

t= 1/f = 0.01 sec

4 / 4

Category: AC Fundamental

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

A) 50 Hz

B) 100 Hz

C) 314 Hz

D) 75 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) 1.11

B) 0.707

C) 0.637

D) 1.414

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

A) L only

B) R only

C) C only

D) R-L-C all

3 / 5

Category: AC Fundamental

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

A) P/S

B) All of these

C) R/Z

D) Vr/V

4 / 5

Category: AC Fundamental

4. 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 leads the voltage across L by 90°

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

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

5 / 5

Category: AC Fundamental

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

A) lags the current

B) leads the current

C) 90° lags the current

D) 90° leads the current

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

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

B) The voltage across R leads 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. For a sinusoidal AC voltage, amplitude factor is –

A) 1.414

B) 0.637

C) 0.707

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.

3 / 5

Category: AC Fundamental

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

A) All of the above

B) R/Z

C) Vr /V

D) P/S

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

A) R-L-C all

B) L only

C) C only

D) R only

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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) Actual power is more than reactive power

B) Reactive power is more than apparent power

C) Apparent power is more than actual power

D) Reactive power is more than actual power

2 / 20

Category: Circuit Theory & Network

2. A parallel AC circuit in resonance will –

A) Have a high impedance

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

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

D) Act like a resister of low value

3 / 20

Category: Circuit Theory & Network

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

A) Minimum

B) a very small amount

C) Maximum

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) Unity

B) Leading

C) Zero

D) Lagging

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) 0.111

C) 0.81

D) 1.111

Q factor is the reciprocal of the power factor

6 / 20

Category: Circuit Theory & Network

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

A) Active component of current

B) Watt-less component of current

C) True component of current

D) none

7 / 20

Category: Circuit Theory & Network

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

A) Bandwidth

B) Resonant frequency

C) None

D) Q

Resonent frequency = 1/2π √(L/C)

8 / 20

Category: Basic Electricity

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

A) Reactive power

B) none of the above

C) Apparent power

D) True power

9 / 20

Category: AC Fundamental

9. 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

10 / 20

Category: AC Fundamental

10. The power factor of an ordinary electric bulb is

A) Unity

B) Slightly less than unity

C) Zero

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

11 / 20

Category: AC Fundamental

11. Unit of impedance is

A) Farad

B) Mho

C) Ohm

D) Henry

12 / 20

Category: AC Fundamental

12. The power factor of practical inductor is

A) Zero

B) Leading

C) Unity

D) Lagging

13 / 20

Category: AC Fundamental

13. 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) 14 ohm

C) 2 ohm

D) 10 ohm

Z= √ (6^2+8^2) = 10 Ohm

14 / 20

Category: AC Fundamental

14. Reactive power is the product of

A) V, I, sin ø

B) V, I, cos ø

C) V, I

D) V, I, tan ø

15 / 20

Category: AC Fundamental

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

A) Vr/V

B) R/Z

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

D) All of the above

16 / 20

Category: AC Fundamental

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

A) zero

B) Lagging

C) leading

D) unity

17 / 20

Category: AC Fundamental

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

A) all of the above

B) True power

C) Real power

D) Average power

18 / 20

Category: AC Fundamental

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

A) None of these

B) 0 and 1

C) -1 and 1

D) 0 and -1

19 / 20

Category: AC Fundamental

19. 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) both A and B

C) Loss of energy in dielectric

D) Ohmic loss due to Ohmic resistance of plates

20 / 20

Category: AC Fundamental

20. Capacitors for power factor correction are rated in -

A) KVAR

B) KVA

C) KW

D) VA

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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) 75%

B) 100%

C) 66.7%

D) 57.7%

2 / 2

Category: Basic Electricity

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

A) 2 ohm

B) 9 ohm

C) 6 ohm

D) 18 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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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

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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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Electrical Circuits Quiz

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

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