MCQ Quiz on Fundamental of Electrical & Electronics Engineering

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Unit- 1 : Electric and Magnetic Circuits

/20

1 votes, 5 avg

304

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

A) The other two lamps will glow

B) no bulb will glow

C) all the three will glow

D) Total current in the circuit will increase

2 / 20

Category: Basic Electricity

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

A) -1

B) Infinity

C) 1

D) 0

Hints: I= c.(dv/dt)

3 / 20

Category: Basic Electricity

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

A) 7:5

B) 2:7

C) 5:7

D) 2:5

4 / 20

Category: Basic Electricity

4. 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

5 / 20

Category: Basic Electricity

5. The capacitor doesn’t allow sudden changes in

A) Resistance

B) Voltage

C) Capacitance

D) Current

6 / 20

Category: Basic Electricity

6. The reciprocal of resistivity is________

A) Impedance

B) Conductance

C) Resistance

D) Conductivity

7 / 20

Category: Basic Electricity

7. The expression for energy of an inductor

A) ½ L^2.I

B) ½ LI

C) ½ LI^2

D) L/2I

8 / 20

Category: Basic Electricity

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

A) Open

B) Polar

C) Short

D) Non-polar

9 / 20

Category: Basic Electricity

9. In a pure inductive circuit current is

A) Leads by voltage by 0°

B) Leads by voltage by 90°

C) Lags by voltage by 0°

D) Lags behind Voltage by 90°

10 / 20

Category: Basic Electricity

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

A) Q + v

B) Q-v

C) Q/v

D) Qv

11 / 20

Category: Basic Electricity

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

A) Brown Black Golden Golden

B) Black Brown Black Golden

C) Black Brown Black Silver

D) Brown Black Golden Silver

12 / 20

Category: Basic Electricity

12. Frequency of Direct Current is

A) 40 Hz

B) 50 Hz

C) 0 Hz

D) 50 kHz

13 / 20

Category: Basic Electricity

13. 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) Total current in the circuit will increase

D) No bulb will glow

14 / 20

Category: Basic Electricity

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

A) R=ρ. (l/a)

B) R= l/( ρ.a)

C) R= ρ. (a/l)

D) R= a/( ρ.l)

15 / 20

Category: Basic Electricity

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

A) open circuit

B) a normal capacitor as in AC

C) a resistor

D) a short circuit

16 / 20

Category: Basic Electricity

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

A) ohm/meter^2

B) ohm-meter

C) ohm/meter

D) ohm-meter^2

17 / 20

Category: Basic Electricity

17. Unit of resistivity is

A) Ohm-m²

B) Ohm

C) Ohm/m

D) Ohm-m

18 / 20

Category: Basic Electricity

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

A) Henry, Coulomb

B) Coulomb, Faraday

C) Faraday, Henry

D) Henry, Faraday

19 / 20

Category: Basic Electricity

19. 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) Both have equal resistance

B) The 2m wire has higher resistance

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

D) The 5m wire has higher resistance

20 / 20

Category: Basic Electricity

20. Resistance of any circuit depends on –

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

B) Directly proportionate with length and cross sectional area

C) Inversely proportionate with length and cross sectional area

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

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

A) False

B) True

2 / 20

Category: Basic Electricity

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

A) 50 Hz

B) 1,000 Hz

C) 10 Hz

D) 100 Hz

Hints:

Frequency = 1/time period

3 / 20

Category: Basic Electricity

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

A) 20 μs

B) 100 μs

C) 4 μs

D) 2 μs

4 / 20

Category: Basic Electricity

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

A) True

B) False

5 / 20

Category: Basic Electricity

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

A) 12 cycles

B) 120 cycles

C) 1/100 cycle

D) 1,200 cycles

6 / 20

Category: Basic Electricity

6. 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

7 / 20

Category: Basic Electricity

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

A) 180°

B) 27°

C) 60°

D) 6°

8 / 20

Category: Basic Electricity

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

A) 2.66 V

B) 26.6 V

C) 4 V

D) 18.8 V

9 / 20

Category: Basic Electricity

9. 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

10 / 20

Category: Basic Electricity

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

A) None of the above

B) 6.5 V

C) 13 V

D) 26 V

11 / 20

Category: Basic Electricity

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

A) False

B) True

12 / 20

Category: Basic Electricity

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

A) 1%

B) 50%

C) 25%

D) 100%

13 / 20

Category: Basic Electricity

13. A phasor represents

A) The width of a quantity

B) The magnitude and a quantity direction

C) The phase angle

D) The magnitude of a quantity

14 / 20

Category: Basic Electricity

14. The unit of frequency is the hertz

A) True

B) False

15 / 20

Category: Basic Electricity

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

A) 1%

B) 100%

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%

16 / 20

Category: Basic Electricity

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

A) True

B) False

17 / 20

Category: Basic Electricity

17. 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) 10 mA

D) 1 mA

18 / 20

Category: Basic Electricity

18. 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

19 / 20

Category: Basic Electricity

19. 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) 39.6 mA

D) 16 mA

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 42%

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

A) Zero

B) Null

C) Infinite

D) The value of the source voltage

2 / 16

Category: Basic Electricity

2. Ideal voltage source has-

A) Zero internal resistance

B) Low internal resistance

C) Infinity internal resistance

D) High internal resistance

3 / 16

Category: Basic Electricity

3. 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

4 / 16

Category: Basic Electricity

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

A) Is divided proportionally across all resistors

B) Is divided equally among all resistors

C) The same for all resistors

D) Is zero for all resistors

5 / 16

Category: Basic Electricity

5. Which is the most cost efficient connection?

A) Series

B) Parallel

C) Either series or parallel

D) Neither series nor parallel

6 / 16

Category: Basic Electricity

6. 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

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

A) It becomes zero

B) It becomes half its original value

C) It becomes double its original value

D) It becomes infinity

9 / 16

Category: Basic Electricity

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

A) Parallel

B) Either series or parallel

C) Neither series nor parallel

D) Series

10 / 16

Category: Basic Electricity

10. 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) Proportional to the power in the circuit

D) Equal in all branches

11 / 16

Category: Basic Electricity

11. 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 stops glowing

C) The other bulb blows out as well

D) The other bulb glows with increased brightness

12 / 16

Category: Basic Electricity

12. Batteries are generally connected in______

A) Either series or parallel

B) Parallel

C) Neither series nor parallel

D) Series

13 / 16

Category: Basic Electricity

13. Ideal voltage source has-

A) Zero internal resistance

B) Infinity internal resistance

C) Low internal resistance

D) High internal resistance

14 / 16

Category: Basic Electricity

14. Active circuit have -

A) either a or b

B) none of these

C) one current source

D) one voltage source

15 / 16

Category: Basic Electricity

15. The energy per unit charge is

A) Current

B) Work

C) Power

D) Voltage

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

16 / 16

Category: Basic Electricity

16. 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 also burns out

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 41%

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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. Find the current in the circuit.

A) 4 A

B) 3 A

C) 2 A

D) 1 A

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) 12 ohm

C) 135 ohm

D) 27 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. What is the value of x if the current in the circuit is 5 A?

A) 25 ohm

B) 15 ohm

C) 75 ohm

D) 55 ohm

4 / 16

Category: Basic Electricity

4. The voltage across the open circuit is?

A) 0 V

B) 100 V

C) Infinity

D) 90 V

5 / 16

Category: Basic Electricity

5. Voltage across the 60 ohm resistor is______

A) 72 V

B) 120 V

C) 0 V

D) 48 V

6 / 16

Category: Basic Electricity

6. Calculate the equivalent resistance between A and B

A) 48 ohm

B) 15 ohm

C) 60 ohm

D) 12 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.

7 / 16

Category: Basic Electricity

7. The total resistance between A and B are?

A) 5 ohm

B) 80 ohm

C) 0 ohm

D) 20 ohm

8 / 16

Category: Basic Electricity

8. Find the voltage across the 6 ohm resistor

A) 27.27 V

B) 181.6 V

C) 150 V

D) 54.48 V

9 / 16

Category: Basic Electricity

9. Calculate the total current in the circuit

A) 10 A

B) 11.43 A

C) 20 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.

10 / 16

Category: Basic Electricity

10. 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.

11 / 16

Category: Basic Electricity

11. Calculate the equivalent resistance between A and B

A) 6.67 ohm

B) 10.67 ohm

C) 46.67 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.

12 / 16

Category: Basic Electricity

12. Calculate the equivalent resistance between A and B

A) 8 ohm

B) 4 ohm

C) 6 ohm

D) 2 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. Calculate the current across the 20 ohm resistor

A) 6.67 A

B) 10 A

C) 36.67 A

D) 20 A

14 / 16

Category: Basic Electricity

14. Calculate the resistance between A and B

A) 7 ohm

B) 29.69 ohm

C) 3.56 ohm

D) 14.26 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.

15 / 16

Category: Basic Electricity

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

A) 0.48 ohm

B) 7 ohm

C) 0 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.

16 / 16

Category: Basic Electricity

16. 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

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) Magnetomotive force

C) Electromotive difference

D) voltage

2 / 13

Category: AC Fundamental

2. Average power taken by a pure capacitor is –

A) Zero

B) Maximum

C) Unity

D) Minimum

3 / 13

Category: Basic Electricity

3. KWh is the unit of -

A) Efficiency

B) Power

C) Work

D) Energy

4 / 13

Category: Basic Electricity

4. In case of D.C –

A) Magnitude of current changes with time

B) Direction of current changes with time

C) Magnitude and direction remains constant

D) Magnitude and direction both change with time

5 / 13

Category: Basic Electricity

5. S.I unit of conductance is –

A) Ohm-m

B) Ohm

C) Mho

D) Mho-m

6 / 13

Category: Basic Electricity

6. S.I unit of Power is –

A) Watt

B) Coulomb

C) Joule

D) Watt-hr

7 / 13

Category: Basic Electricity

7. 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) Total current in the circuit will increase

C) no bulb will glow

D) The other two lamps will glow

8 / 13

Category: Basic Electricity

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

A) electrons

B) Atoms

C) electrons & ions

D) positive charges

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) Temperature of the inductor

C) Square of rate of change of current

D) Square of instantaneous current

10 / 13

Category: Basic Electricity

10. 1 coulomb charge equals the charge of –

A) 6.24×10^18 electrons

B) 6.24×10^16 electrons

C) 6.24×10^12 electrons

D) 6.24×10^-18 electrons

11 / 13

Category: Basic Electricity

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

A) Voltmeter

B) Ohmmeter

C) Ammeter

D) Multimeter

12 / 13

Category: Basic Electricity

12. Insulating material can –

A) Store varying voltage

B) Conduct very large current

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

D) Protect a short circuit between two conductors

13 / 13

Category: Basic Electricity

13. Electric pressure is also called –

A) Voltage

B) Conductance

C) Resistance

D) Energy

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: Basic Electricity

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

A) high

B) Low

C) zero

D) unity

2 / 20

Category: AC Fundamental

2. Absolute permittivity of dielectric medium is represented as –

A) ε0

B) εr /ε0

C) εr

D) ε0 εr

3 / 20

Category: Magnetic Circuit

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

A) Multi turn coil

B) both a and c

C) Insulator

D) Solenoid

4 / 20

Category: Magnetic Circuit

4. Magnetic field has -

A) only magnitude

B) none

C) both magnitude & direction

D) Only direction

5 / 20

Category: Magnetic Circuit

5. In a electric circuit MMF is similar to

A) Electromotive force

B) Resistance

C) Current

D) Flux

6 / 20

Category: Magnetic Circuit

6. The unit of magnetic flux is –

A) Weber

B) Tesla

C) Henry

D) Ampere turns

7 / 20

Category: Magnetic Circuit

7. Magnetic field is proportional to the –

A) all of these

B) Speed of electric charges

C) direction of electric charges

D) Quality of electric charges

8 / 20

Category: Magnetic Circuit

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

A) Tesla

B) Both A & B

C) Oersted

D) WB/m²

9 / 20

Category: Magnetic Circuit

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

A) Current

B) None

C) Voltage drop

D) Emf

10 / 20

Category: Magnetic Circuit

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

A) Reluctance

B) number of turns in the circuit

C) Magnitude of current

D) either b or c

11 / 20

Category: Magnetic Circuit

11. Which of the following is unit less?

A) Magnetic susceptibility

B) Permittivity

C) Permeability

D) Moment of Magnet

12 / 20

Category: Magnetic Circuit

12. Paramagnetic materials are –

A) strongly repelled by a magnet

B) Strongly attracted by a magnet

C) slightly attracted by a magnet

D) none

13 / 20

Category: Magnetic Circuit

13. Hysteresis loss least depends on –

A) volume of material

B) steinmetz coefficient of material

C) ambient temperature

D) frequency

14 / 20

Category: Magnetic Circuit

14. Magnetic field strength is

A) N.i / L

B) None of these

C) N.ø/I

D) N.i

15 / 20

Category: Magnetic Circuit

15. Magnetic circuit is a closed path followed by –

A) Flux density

B) None of these

C) flux

D) M.M.F

16 / 20

Category: Magnetic Circuit

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

A) Electromagnetic fields

B) Electromagnets

C) Electric magnets

D) Electromagnetism field

17 / 20

Category: Magnetic Circuit

17. Magnetic lines of forces –

A) are not predictable

B) often intersect

C) intersect only in some special circumstances

D) never intersect

18 / 20

Category: Magnetic Circuit

18. S.I unit of Reluctance-

A) N/Wb

B) AT/m

C) AT/Wb

D) AT

19 / 20

Category: Magnetic Circuit

19. The reciprocal of permeability is –

A) Resistivity

B) Conductivity

C) reluctivity

D) MMF

20 / 20

Category: Magnetic Circuit

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

A) rapid reversals of its magnetisation

B) its high retentivity

C) molecular friction

D) flux density lagging behind magnetising force

Your score is

The average score is 47%

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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. An open coil has –

A) Infinite resistance and zero inductance

B) Infinite resistance and normal inductance

C) Zero resistance and inductance

D) Zero resistance and high inductance

2 / 4

Category: Magnetic Circuit

2. 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 applied voltage

C) Aid the increasing current

D) Tend to decrease the amount of current

3 / 4

Category: Magnetic Circuit

3. The principle of electromagnetic induction was propounded by

A) Flemmings

B) Faraday

C) Orsted

D) Edison

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) Lenz

B) Coulomb

C) Faraday

D) Newton

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. 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) Self-inductance

C) None

D) Mutual inductance

2 / 6

Category: Magnetic Circuit

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

A) Coil resistance

B) Flux magnitude

C) None

D) Rate of change of flux

3 / 6

Category: DC Machines

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

A) Transformer

B) Thermo-couple

C) Choke

D) Generator

4 / 6

Category: AC Machines & Transformer

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

A) Generator

B) Transformer

C) Battery

D) Motor

5 / 6

Category: AC Fundamental

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

A) High capacitance

B) Low impedance

C) High Inductance

D) High impedance

6 / 6

Category: Basic Electricity

6. Electrolysis is possible with –

A) D.C supply only

B) none

C) A.C supply only

D) both A.C and D.C supply

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The average score is 50%

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/12

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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. 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) 20 J

B) 60 J

C) 15 J

D) 90 J

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

2 / 12

Category: Magnetic Circuit

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

A) LI^2 / 2

B) LI^2

C) L^2 I / 2

D) IL^2

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) decrease

B) Remain the same

C) Increase

D) initially increase and then decrease

4 / 12

Category: Magnetic Circuit

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

A) quadrupled

B) Unaffected

C) doubled

D) halved

5 / 12

Category: Magnetic Circuit

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

A) I/4

B) I

C) 0

D) I/2

6 / 12

Category: Magnetic Circuit

6. Higher the self-inductance of a coil –

A) longer the delay in establishing steady current through it

B) Lesser its Weber-turns

C) lower the E.M.F. induced

D) Greater the flux produced by it

7 / 12

Category: Magnetic Circuit

7. 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.

8 / 12

Category: Magnetic Circuit

8. 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

C) I/2

D) I/4

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

9 / 12

Category: Magnetic Circuit

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

A) LI / 2t

B) L / 2I^2 t

C) LI^2/ 2t

D) L / 2It

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

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) 150 J

B) 190 J

C) 160 J

D) 220 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. The energy stored by a capacitor is given by –

A) 1/2 QV

B) 1/2 CV^2

C) All of the above

D) Q^2 / 2C

12 / 12

Category: AC Fundamental

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

A) both a and b

B) none

C) Magnetic field

D) electric field

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The average score is 52%

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

A) Fleming's Left Hand Rule

B) Faraday's Right Hand Rule

C) Faraday's Left Hand Rule

D) Fleming's Right Hand Rule

2 / 5

Category: Magnetic Circuit

2. A magnetic field like this is called –

A) A uniform field

B) a paramagnetic field

C) A parallel field

D) a distorted field

3 / 5

Category: Magnetic Circuit

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

A) The piece of metal will lose it magnetism

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

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

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

4 / 5

Category: DC Machines

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

A) Palm rule

B) Left hand thumb rule

C) Flemmings Right hand rule

D) Flemmings Left hand rule

5 / 5

Category: DC Machines

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

A) Flemmings Left hand rule

B) Left hand thumb rule

C) Flemmings Right hand rule

D) Pulm rule

Your score is

The average score is 42%

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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. 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) 2 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) 0.005 kWh

B) 0.05 Wh

C) 0.05 kWh

D) 5 kWh

Hints:

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

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The average score is 30%

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

A) Heating effect

B) Current

C) Charge transfer

D) Voltage

2 / 20

Category: AC Fundamental

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

A) I average value

B) I max Lm value

C) I R.M.S.

D) None

3 / 20

Category: AC Fundamental

3. The frequency of an alternating current is –

A) The number of cycles generated in one minute

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

C) The speed with which the alternator runs

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

4 / 20

Category: AC Fundamental

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

A) 20 Hz

B) 5 Hz

C) 50 Hz

D) 30 Hz

5 / 20

Category: AC Fundamental

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

A) 25 π

B) 50 π

C) 100 π

D) 5 π

Hints:

Angular frequency = 2πf rad/sec = 100π

6 / 20

Category: AC Fundamental

6. 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

7 / 20

Category: AC Fundamental

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

A) 0.707

B) 0.637

C) 1.11

D) 1.414

Hints:

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

8 / 20

Category: AC Fundamental

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

A) Resistance and Reactance

B) Permeance and Susceptance

C) Reluctance and Permeance

D) Conductance, Susceptance

9 / 20

Category: AC Fundamental

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

A) A sinusoid of half the original frequency

B) A sinusoid of double the frequency

C) A sinusoid of the same frequency

D) Not a sinusoid

10 / 20

Category: AC Fundamental

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

A) C only

B) L only

C) All of these

D) R only

11 / 20

Category: AC Fundamental

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

A) Magnitude only

B) Both magnitude and direction

C) None

D) Direction only

12 / 20

Category: AC Fundamental

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

A) 1

B) 0.707

C) 1.11

D) 1.41

13 / 20

Category: AC Fundamental

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

A) Heating effect

B) Charge transfers

C) Current

D) Voltage

14 / 20

Category: AC Fundamental

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

A) 282.8 A

B) 70.7 A

C) 150 A

D) 141 A

Hints: Peak factor of sine wave = 1.41

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

15 / 20

Category: AC Fundamental

15. Form factor of half wave rectified ac is-

A) 1.11

B) 2

C) 1.41

D) 1.57

16 / 20

Category: AC Fundamental

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

A) 1 Hz

B) π Hz

C) None

D) 2π Hz

Hints:

v= Vm sin 2πft volt

here f=1 Hz

17 / 20

Category: AC Fundamental

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

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

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

C) None

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

18 / 20

Category: AC Fundamental

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

A) 0°

B) 360°

C) 180°

D) 90°

19 / 20

Category: AC Fundamental

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

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

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

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

D) Less insulation is required in case of AC

20 / 20

Category: AC Fundamental

20. Form factor of square wave is-

A) 2

B) 1.47

C) 1

D) 1.41

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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) 707.2 A

B) 7.07 A

C) 100 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) 60 Hz

B) None

C) 25 Hz

D) 50 Hz

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) 0.01 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

4 / 4

Category: AC Fundamental

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

A) 75 Hz

B) 100 Hz

C) 50 Hz

D) 314 Hz

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The average score is 43%

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

A) R-L-C all

B) C only

C) L only

D) R only

3 / 5

Category: AC Fundamental

3. 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 180o out of face

D) Voltage across R and L are in phase

4 / 5

Category: AC Fundamental

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

A) lags the current

B) leads the current

C) 90° leads the current

D) 90° lags the current

5 / 5

Category: AC Fundamental

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

A) P/S

B) Vr/V

C) All of these

D) R/Z

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The average score is 31%

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2nd Semester

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

Fundamentals of Electrical & Electronics Engineering

Diploma in Engineering & Technology

2nd Semester - Common to all branch

1 / 5

Category: AC Fundamental

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

A) R/Z

B) Vr /V

C) P/S

D) All of the above

2 / 5

Category: AC Fundamental

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

A) 1.414

B) 1.11

C) 0.707

D) 0.637

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

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

B) Voltage across R and L are in phase

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

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

In an inductive circuit current always lag behind the voltage.

4 / 5

Category: AC Fundamental

4. 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

5 / 5

Category: AC Fundamental

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

A) lags the current

B) 90° lags the current

C) leads the current

D) 90° leads the current

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The average score is 49%

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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) True power

B) none of the above

C) Apparent power

D) Reactive power

2 / 20

Category: AC Fundamental

2. Capacitors for power factor correction are rated in -

A) KVAR

B) KW

C) KVA

D) VA

3 / 20

Category: AC Fundamental

3. The power factor of practical inductor is

A) Zero

B) Lagging

C) Unity

D) Leading

4 / 20

Category: AC Fundamental

4. Reactive power is the product of

A) V, I, cos ø

B) V, I, tan ø

C) V, I, sin ø

D) V, I

5 / 20

Category: AC Fundamental

5. Unit of impedance is

A) Henry

B) Ohm

C) Farad

D) Mho

6 / 20

Category: AC Fundamental

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

A) 0 and 1

B) None of these

C) 0 and -1

D) -1 and 1

7 / 20

Category: AC Fundamental

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

A) All of the above

B) R/Z

C) Vr/V

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

8 / 20

Category: AC Fundamental

8. 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

9 / 20

Category: AC Fundamental

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

A) Real power

B) True power

C) Average power

D) all of the above

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) Capacitive reactance in ohms

C) both A and B

D) Loss of energy in dielectric

11 / 20

Category: AC Fundamental

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

A) capacitance & supply frequency is more

B) Capacitance is more & supply frequency is less

C) capacitance is less & supply frequency is more

D) Capacitance & supply frequency is less

Xc= 1/2πfC

12 / 20

Category: AC Fundamental

12. 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

13 / 20

Category: Circuit Theory & Network

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

A) Leading

B) Unity

C) Lagging

D) Zero

14 / 20

Category: Circuit Theory & Network

14. In any AC circuit always –

A) Actual power is more than reactive power

B) Reactive power is more than apparent power

C) Reactive power is more than actual power

D) Apparent power is more than actual power

15 / 20

Category: Circuit Theory & Network

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

A) none

B) True component of current

C) Watt-less component of current

D) Active component of current

16 / 20

Category: Circuit Theory & Network

16. A parallel AC circuit in resonance will –

A) Have a high impedance

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

C) Act like a resister of low value

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

17 / 20

Category: Circuit Theory & Network

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

A) 1

B) 1.111

C) 0.111

D) 0.81

Q factor is the reciprocal of the power factor

18 / 20

Category: Circuit Theory & Network

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

A) Maximum

B) a very small amount

C) Minimum

D) Zero

19 / 20

Category: Circuit Theory & Network

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

A) Leading

B) Lagging

C) Unity

D) Zero

20 / 20

Category: Circuit Theory & Network

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

A) Bandwidth

B) Q

C) Resonant frequency

D) None

Resonent frequency = 1/2π √(L/C)

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2nd Semester

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

Fundamentals of Electrical & Electronics Engineering

Diploma in Engineering & Technology

2nd Semester - Common to all branch

1 / 2

Category: Basic Electricity

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

A) 18 ohm

B) 2 ohm

C) 9 ohm

D) 6 ohm

2 / 2

Category: AC Machines & Transformer

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

A) 66.7%

B) 75%

C) 57.7%

D) 100%

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The average score is 38%

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Unit- 4 : Transformers and Machines

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2nd Semester

FEEE Unit- 4.1 : Transformer and Machines

Fundamentals of Electrical & Electronics Engineering

Diploma in Engineering & Technology

2nd Semester - Common for all branches

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

Fundamentals of Electrical & Electronics Engineering

Diploma in Engineering & Technology

2nd Semester - Common to all branch

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2nd Semester

FEEE Unit-4.3 : 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

Diploma in Engineering & Technology

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

Fundamentals of Electrical & Electronics Engineering

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2nd Semester - Common to all branch

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

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