MCQ Quiz on Fundamental of Electrical & Electronics Engineering

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Unit- 1 : Electric and Magnetic Circuits

/20

1 votes, 5 avg

305

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. The expression for energy of an inductor

A) L/2I

B) ½ LI^2

C) ½ L^2.I

D) ½ LI

2 / 20

Category: Basic Electricity

2. The capacitor doesn’t allow sudden changes in

A) Current

B) Voltage

C) Capacitance

D) Resistance

3 / 20

Category: Basic Electricity

3. What is the resistivity of Copper?

A) 2.7×10^-8 ohm-m

B) 7.3×10^-8 ohm-m

C) 5.35×10^-8 ohm-m

D) 1.59×10^-8 ohm-m

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

A) A normal capacitor as in AC

B) A resistor

C) A short circuit

D) Open circuit

6 / 20

Category: Basic Electricity

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

A) R= ρ. (a/l)

B) R= a/( ρ.l)

C) R=ρ. (l/a)

D) R= l/( ρ.a)

7 / 20

Category: Basic Electricity

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

A) Resistivity depend on the length

B) Resistivity depend on area of cross section

C) Resistance does not depend on the temperature

D) Resistance depends on the temperature

8 / 20

Category: Basic Electricity

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

A) 8 times

B) 4 times

C) 16 times – of the previous

D) 32 times

9 / 20

Category: Basic Electricity

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

A) 32 times

B) 16 times

C) 8 times

D) 4 times

10 / 20

Category: Basic Electricity

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

A) Black Brown Black Golden

B) Brown Black Golden Silver

C) Brown Black Golden Golden

D) Black Brown Black Silver

11 / 20

Category: Basic Electricity

11. The Inductor doesn’t allow sudden changes in

A) Resistance

B) Inductance

C) Current

D) Voltage

12 / 20

Category: Basic Electricity

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

A) R= l/( ρ.a)

B) R=ρ. (l/a)

C) R= a/( ρ.l)

D) R= ρ. (a/l)

13 / 20

Category: Basic Electricity

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

A) Faraday, Henry

B) Coulomb, Faraday

C) Henry, Faraday

D) Henry, Coulomb

14 / 20

Category: Basic Electricity

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

A) 8 ohm-meter

B) 16 kiloohm-meter

C) 8 kilo ohm-meter

D) 16 ohm-meter

Hints:

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

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

15 / 20

Category: Basic Electricity

15. 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) No bulb will glow

C) The other two lamps will glow

D) Total current in the circuit will increase

16 / 20

Category: Basic Electricity

16. Resistance of any circuit depends on –

A) Inversely proportionate with length and cross sectional area

B) Directly proportionate with length and cross sectional area

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

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

17 / 20

Category: Basic Electricity

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

A) Short

B) Non-polar

C) Open

D) Polar

18 / 20

Category: Basic Electricity

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

A) 90 J

B) 15 J

C) 60 J

D) 20 J

19 / 20

Category: Basic Electricity

19. The insulating medium between the two plates of capacitor is known as __________

A) Dielectric

B) Conducting medium

C) Electrode

D) Capacitive medium

20 / 20

Category: Basic Electricity

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

A) 1

B) Infinity

C) 0

D) -1

Hints: I= c.(dv/dt)

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: AC Fundamental

1. The length of a phasor represents the amplitude

A) False

B) True

2 / 20

Category: Basic Electricity

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

A) True

B) False

3 / 20

Category: Basic Electricity

3. The unit of frequency is the hertz

A) True

B) False

4 / 20

Category: Basic Electricity

4. 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

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) 1/100 cycle

C) 120 cycles

D) 1,200 cycles

6 / 20

Category: Basic Electricity

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

A) 6.5 V

B) 26 V

C) None of the above

D) 13 V

7 / 20

Category: Basic Electricity

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

A) 6.37 V

B) 50.96 V

C) 14.14 V

D) 25.48 V

8 / 20

Category: Basic Electricity

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

A) 45.12 mA

B) 39.6 mA

C) 16 mA

D) 22.6 mA

9 / 20

Category: Basic Electricity

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

A) 50%

B) 100%

C) 25%

D) 1%

10 / 20

Category: Basic Electricity

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

A) 180°

B) 60°

C) 6°

D) 27°

11 / 20

Category: Basic Electricity

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

A) False

B) True

12 / 20

Category: Basic Electricity

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

A) Cannot be determined

B) 1%

C) 30%

D) 100%

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%

13 / 20

Category: Basic Electricity

13. A phasor represents

A) The width of a quantity

B) The phase angle

C) The magnitude and a quantity direction

D) The magnitude of a quantity

14 / 20

Category: Basic Electricity

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

A) False

B) True

15 / 20

Category: Basic Electricity

15. 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

16 / 20

Category: Basic Electricity

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

A) 2,500 Hz

B) 400 Hz

C) 250 Hz

D) 25,000 Hz

17 / 20

Category: Basic Electricity

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

A) None of the above

B) 40°

C) 0°

D) 45°

18 / 20

Category: Basic Electricity

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

A) False

B) True

19 / 20

Category: Basic Electricity

19. 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

20 / 20

Category: Basic Electricity

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

A) False

B) True

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) Null

B) Zero

C) The value of the source voltage

D) Infinite

2 / 16

Category: Basic Electricity

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

A) Parallel

B) Series

C) Neither series nor parallel

D) Either series or parallel

3 / 16

Category: Basic Electricity

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

A) It becomes infinity

B) It becomes half its original value

C) It becomes zero

D) It becomes double its original value

4 / 16

Category: Basic Electricity

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

A) Proportional to the power in the circuit

B) The amount of time the circuit

C) Proportional to the value of the resistors

D) Equal in all branches

5 / 16

Category: Basic Electricity

5. Ideal voltage source has-

A) Low internal resistance

B) High internal resistance

C) Infinity internal resistance

D) Zero internal resistance

6 / 16

Category: Basic Electricity

6. 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

7 / 16

Category: Basic Electricity

7. Which is the most cost efficient connection?

A) Neither series nor parallel

B) Parallel

C) Series

D) Either series or parallel

8 / 16

Category: Basic Electricity

8. Active circuit have -

A) one current source

B) none of these

C) one voltage source

D) either a or b

9 / 16

Category: Basic Electricity

9. Batteries are generally connected in______

A) Parallel

B) Neither series nor parallel

C) Either series or parallel

D) Series

10 / 16

Category: Basic Electricity

10. 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 glows with increased brightness

C) The other bulb stops glowing

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

11 / 16

Category: Basic Electricity

11. 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

12 / 16

Category: Basic Electricity

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

A) Is zero for all resistors

B) Is divided proportionally across all resistors

C) Is divided equally among all resistors

D) The same for all resistors

13 / 16

Category: Basic Electricity

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

A) Current

B) Voltage

C) Neither voltage nor current

D) Both voltage and current

14 / 16

Category: Basic Electricity

14. Many resistors connected in series will?

A) Reduce the power to zero

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

C) Divide the current proportionally

D) Divide the voltage proportionally among all the resistor

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. Ideal voltage source has-

A) Low internal resistance

B) Zero internal resistance

C) Infinity internal resistance

D) High internal resistance

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. 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.

2 / 16

Category: Basic Electricity

2. The voltage across the short is?

A) Zero

B) 135 V

C) Infinity

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.

3 / 16

Category: Basic Electricity

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

A) 75 ohm

B) 25 ohm

C) 15 ohm

D) 55 ohm

4 / 16

Category: Basic Electricity

4. Voltage across the 60 ohm resistor is______

A) 120 V

B) 48 V

C) 0 V

D) 72 V

5 / 16

Category: Basic Electricity

5. The total resistance between A and B are?

A) 80 ohm

B) 0 ohm

C) 5 ohm

D) 20 ohm

6 / 16

Category: Basic Electricity

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

A) 0.48 ohm

B) 7 ohm

C) 7.67 ohm

D) 0 ohm

Hints:

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

7 / 16

Category: Basic Electricity

7. Calculate the equivalent resistance between A and B

A) 46.67 ohm

B) 6.67 ohm

C) 26.67 ohm

D) 10.67 ohm

Hints:

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

8 / 16

Category: Basic Electricity

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

A) 5 ohm

B) 12 ohm

C) 27 ohm

D) 135 ohm

Hints:

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

9 / 16

Category: Basic Electricity

9. Find the current in the circuit.

A) 4 A

B) 2 A

C) 3 A

D) 1 A

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) The largest one among the three values

C) 0 A

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. The voltage across the open circuit is?

A) Infinity

B) 0 V

C) 100 V

D) 90 V

12 / 16

Category: Basic Electricity

12. Calculate the current across the 20 ohm resistor

A) 6.67 A

B) 20 A

C) 36.67 A

D) 10 A

13 / 16

Category: Basic Electricity

13. Calculate the equivalent resistance between A and B

A) 48 ohm

B) 12 ohm

C) 60 ohm

D) 15 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.

14 / 16

Category: Basic Electricity

14. Calculate the equivalent resistance between A and B

A) 6 ohm

B) 8 ohm

C) 2 ohm

D) 4 ohm

Hints:

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

15 / 16

Category: Basic Electricity

15. Find the voltage across the 6 ohm resistor

A) 54.48 V

B) 150 V

C) 181.6 V

D) 27.27 V

16 / 16

Category: Basic Electricity

16. Calculate the resistance between A and B

A) 7 ohm

B) 14.26 ohm

C) 3.56 ohm

D) 29.69 ohm

Hints:

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

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. In case of D.C –

A) Magnitude of current changes with time

B) Magnitude and direction remains constant

C) Magnitude and direction both change with time

D) Direction of current changes with time

2 / 13

Category: Basic Electricity

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

A) Ammeter

B) Multimeter

C) Voltmeter

D) Ohmmeter

3 / 13

Category: Basic Electricity

3. S.I unit of conductance is –

A) Mho

B) Ohm-m

C) Mho-m

D) Ohm

4 / 13

Category: Basic Electricity

4. Instantaneous power in inductor is proportional to the –

A) Square of instantaneous current

B) Square of rate of change of current

C) Temperature of the inductor

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

5 / 13

Category: Basic Electricity

5. Electric pressure is also called –

A) Voltage

B) Energy

C) Resistance

D) Conductance

6 / 13

Category: Basic Electricity

6. S.I unit of Power is –

A) Joule

B) Coulomb

C) Watt-hr

D) Watt

7 / 13

Category: Basic Electricity

7. Insulating material can –

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

B) Protect a short circuit between two conductors

C) Store varying voltage

D) Conduct very large current

8 / 13

Category: Basic Electricity

8. KWh is the unit of -

A) Power

B) Work

C) Efficiency

D) Energy

9 / 13

Category: Basic Electricity

9. 1 coulomb charge equals the charge of –

A) 6.24×10^16 electrons

B) 6.24×10^12 electrons

C) 6.24×10^18 electrons

D) 6.24×10^-18 electrons

10 / 13

Category: Basic Electricity

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

A) Atoms

B) electrons & ions

C) positive charges

D) electrons

11 / 13

Category: Basic Electricity

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

A) no bulb will glow

B) Total current in the circuit will increase

C) The other two lamps will glow

D) all the three will glow

12 / 13

Category: AC Fundamental

12. Average power taken by a pure capacitor is –

A) Zero

B) Unity

C) Minimum

D) Maximum

13 / 13

Category: Magnetic Circuit

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

A) voltage

B) Electromotive difference

C) Electromotive force

D) Magnetomotive force

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) ε0

B) ε0 εr

C) εr

D) εr /ε0

2 / 20

Category: Magnetic Circuit

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

A) Electromagnetism field

B) Electric magnets

C) Electromagnetic fields

D) Electromagnets

3 / 20

Category: Magnetic Circuit

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

A) Oersted

B) WB/m²

C) Tesla

D) Both A & B

4 / 20

Category: Magnetic Circuit

4. The unit of magnetic flux is –

A) Henry

B) Weber

C) Tesla

D) Ampere turns

5 / 20

Category: Magnetic Circuit

5. Magnetic field is proportional to the –

A) Speed of electric charges

B) Quality of electric charges

C) direction of electric charges

D) all of these

6 / 20

Category: Magnetic Circuit

6. In a electric circuit MMF is similar to

A) Current

B) Resistance

C) Electromotive force

D) Flux

7 / 20

Category: Magnetic Circuit

7. The reciprocal of permeability is –

A) Resistivity

B) Conductivity

C) MMF

D) reluctivity

8 / 20

Category: Magnetic Circuit

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

A) both a and c

B) Insulator

C) Multi turn coil

D) Solenoid

9 / 20

Category: Magnetic Circuit

9. Magnetic lines of forces –

A) intersect only in some special circumstances

B) never intersect

C) often intersect

D) are not predictable

10 / 20

Category: Magnetic Circuit

10. Magnetic circuit is a closed path followed by –

A) M.M.F

B) Flux density

C) None of these

D) flux

11 / 20

Category: Magnetic Circuit

11. S.I unit of Reluctance-

A) AT/m

B) N/Wb

C) AT/Wb

D) AT

12 / 20

Category: Magnetic Circuit

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

A) Emf

B) None

C) Current

D) Voltage drop

13 / 20

Category: Magnetic Circuit

13. Paramagnetic materials are –

A) slightly attracted by a magnet

B) none

C) Strongly attracted by a magnet

D) strongly repelled by a magnet

14 / 20

Category: Magnetic Circuit

14. Hysteresis loss least depends on –

A) steinmetz coefficient of material

B) volume of material

C) ambient temperature

D) frequency

15 / 20

Category: Magnetic Circuit

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

A) molecular friction

B) flux density lagging behind magnetising force

C) rapid reversals of its magnetisation

D) its high retentivity

16 / 20

Category: Magnetic Circuit

16. Which of the following is unit less?

A) Magnetic susceptibility

B) Permittivity

C) Moment of Magnet

D) Permeability

17 / 20

Category: Magnetic Circuit

17. Magnetic field strength is

A) N.ø/I

B) N.i / L

C) None of these

D) N.i

18 / 20

Category: Magnetic Circuit

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

A) Reluctance

B) Magnitude of current

C) number of turns in the circuit

D) either b or c

19 / 20

Category: Magnetic Circuit

19. Magnetic field has -

A) Only direction

B) none

C) both magnitude & direction

D) only magnitude

20 / 20

Category: Basic Electricity

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

A) Low

B) unity

C) zero

D) high

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. The principle of electromagnetic induction was propounded by

A) Orsted

B) Flemmings

C) Faraday

D) Edison

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) Tend to decrease the amount of current

C) Aid the increasing current

D) Aid the applied voltage

3 / 4

Category: Magnetic Circuit

3. An open coil has –

A) Zero resistance and inductance

B) Infinite resistance and zero inductance

C) Infinite resistance and normal inductance

D) Zero resistance and high inductance

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) Newton

B) Coulomb

C) Faraday

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) Mutual inductance

B) None

C) Capacitance

D) Self-inductance

3 / 6

Category: DC Machines

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

A) Thermo-couple

B) Transformer

C) Choke

D) Generator

4 / 6

Category: AC Fundamental

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

A) High impedance

B) High Inductance

C) Low impedance

D) High capacitance

5 / 6

Category: Basic Electricity

5. Electrolysis is possible with –

A) none

B) D.C supply only

C) A.C supply only

D) both A.C and D.C supply

6 / 6

Category: AC Machines & Transformer

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

A) Transformer

B) Motor

C) Generator

D) Battery

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

A) LI^2/ 2t

B) LI / 2t

C) L / 2It

D) L / 2I^2 t

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

2 / 12

Category: Magnetic Circuit

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

A) IL^2

B) L^2 I / 2

C) LI^2

D) LI^2 / 2

3 / 12

Category: Magnetic Circuit

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

A) 220 J

B) 160 J

C) 150 J

D) 190 J

Hints:

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

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) 0

B) I

C) I/2

D) I/4

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) 0

C) I/2

D) I

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

6 / 12

Category: Magnetic Circuit

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

A) halved

B) Unaffected

C) doubled

D) quadrupled

7 / 12

Category: Magnetic Circuit

7. 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) 60 J

B) 15 J

C) 90 J

D) 20 J

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

8 / 12

Category: Magnetic Circuit

8. 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) Increase

B) decrease

C) Remain the same

D) initially increase and then decrease

9 / 12

Category: Magnetic Circuit

9. 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

10 / 12

Category: Magnetic Circuit

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

A) 3.5 V

B) 2.5 V

C) 5 V

D) 1.5 V

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

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) Q^2 / 2C

D) All of the above

12 / 12

Category: AC Fundamental

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

A) none

B) electric field

C) Magnetic field

D) both a and b

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The average score is 52%

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Electrical Notebook

2nd Semester

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

Fundamentals of Electrical & Electronics Engineering

Diploma in Engineering & Technology

2nd Semester - Common to all branch

1 / 5

Category: 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 Right Hand Rule

B) Fleming's Left Hand Rule

C) Faraday's Right Hand Rule

D) Faraday's Left Hand Rule

2 / 5

Category: Magnetic Circuit

2. 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

3 / 5

Category: Magnetic Circuit

3. A magnetic field like this is called –

A) a distorted field

B) A uniform field

C) A parallel field

D) a paramagnetic field

4 / 5

Category: DC Machines

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

A) Left hand thumb rule

B) Palm rule

C) Flemmings Left hand rule

D) Flemmings Right hand rule

5 / 5

Category: DC Machines

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

A) Left hand thumb rule

B) Pulm rule

C) Flemmings Right hand rule

D) Flemmings Left hand rule

Your score is

The average score is 42%

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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) 1 kWh

B) 2 kWh

C) 4 kWh

D) 5 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 Wh

B) 5 kWh

C) 0.005 kWh

D) 0.05 kWh

Hints:

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

Your score is

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) Charge transfer

B) Current

C) Heating effect

D) Voltage

2 / 20

Category: AC Fundamental

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

A) L only

B) All of these

C) C only

D) R only

3 / 20

Category: AC Fundamental

3. 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

4 / 20

Category: AC Fundamental

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

A) 1

B) 1.41

C) 0.707

D) 1.11

5 / 20

Category: AC Fundamental

5. Capacitive Susceptance is a measure of –

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

B) Reactive power in a circuit

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

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

6 / 20

Category: AC Fundamental

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

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

B) Less insulation is required in case of AC

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

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

7 / 20

Category: AC Fundamental

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

A) Voltage

B) Current

C) Charge transfer

D) Heating effect

8 / 20

Category: AC Fundamental

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

A) Reluctance and Permeance

B) Conductance, Susceptance

C) Permeance and Susceptance

D) Resistance and Reactance

9 / 20

Category: AC Fundamental

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

A) 50 Hz

B) 5 Hz

C) 20 Hz

D) 30 Hz

10 / 20

Category: AC Fundamental

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

A) Charge transfers

B) Heating effect

C) Current

D) Voltage

11 / 20

Category: AC Fundamental

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

A) R.M.S. value 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

12 / 20

Category: AC Fundamental

12. The frequency of an alternating current is –

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

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

C) The speed with which the alternator runs

D) The number of cycles generated in one minute

13 / 20

Category: AC Fundamental

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

A) None

B) 2π Hz

C) π Hz

D) 1 Hz

Hints:

v= Vm sin 2πft volt

here f=1 Hz

14 / 20

Category: AC Fundamental

14. Form factor of square wave is-

A) 1.41

B) 2

C) 1

D) 1.47

15 / 20

Category: AC Fundamental

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

A) RMS voltage

B) Peak voltage

C) Average voltage

D) None

16 / 20

Category: AC Fundamental

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

A) 180°

B) 90°

C) 360°

D) 0°

17 / 20

Category: AC Fundamental

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

A) A sinusoid of the same frequency

B) A sinusoid of double the frequency

C) A sinusoid of half the original frequency

D) Not a sinusoid

18 / 20

Category: AC Fundamental

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

A) 282.8 V

B) 200 V

C) 141.4 V

D) 127.4 V

Hints:

Peak factor = Max value/rms value = 1.41

rms value = 200/1.41 = 141.8 V

Form factor = rms value / avarage value = 1.11

Avarage value = 141.84/1.11 = 127.7 V

19 / 20

Category: AC Fundamental

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

A) 150 A

B) 70.7 A

C) 141 A

D) 282.8 A

Hints: Peak factor of sine wave = 1.41

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

20 / 20

Category: AC Fundamental

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

A) None

B) Magnitude only

C) Direction only

D) Both magnitude and direction

Your score is

The average score is 35%

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Electrical Notebook

2nd Semester

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

Fundamentals of Electrical & Electronics Engineering

Diploma in Engineering & Technology

2nd Semester - Common to all branch

1 / 4

Category: 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) 70.72 A

C) 707.2 A

D) 100 A

Hints:

from peak factor,

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

2 / 4

Category: AC Fundamental

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

A) 0.06 sec

B) 0.05 sec

C) 0.01 sec

D) 0.04 sec

Hints:

2πf= 628

f=628/2π = 99.94 Hz

t= 1/f = 0.01 sec

3 / 4

Category: AC Fundamental

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

A) 50 Hz

B) 100 Hz

C) 75 Hz

D) 314 Hz

4 / 4

Category: AC Fundamental

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

A) 25 Hz

B) 60 Hz

C) 50 Hz

D) None

Hints:

2πf = 314

f= 314/2π = 49.97 Hz = 50 Hz

Your score is

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: AC Fundamental

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

A) C only

B) R-L-C all

C) L only

D) R only

2 / 5

Category: AC Fundamental

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

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

B) Voltage across R and L are in phase

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

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

3 / 5

Category: AC Fundamental

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

A) leads the current

B) 90° leads the current

C) lags the current

D) 90° lags the current

5 / 5

Category: Basic Electricity

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

A) 0.637

B) 0.707

C) 1.11

D) 1.414

Hints:

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

Your score is

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

A) L only

B) R only

C) R-L-C all

D) C only

2 / 5

Category: AC Fundamental

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

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

B) Voltage across R and L are in phase

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

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

In an inductive circuit current always lag behind the voltage.

3 / 5

Category: AC Fundamental

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

A) 90° leads the current

B) leads the current

C) lags the current

D) 90° lags the current

4 / 5

Category: AC Fundamental

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

A) Vr /V

B) R/Z

C) P/S

D) All of the above

5 / 5

Category: AC Fundamental

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

A) 0.707

B) 1.11

C) 0.637

D) 1.414

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.

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The average score is 49%

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Electrical Notebook

2nd Semester

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

Fundamentals of Electrical & Electronics Engineering

Diploma in Engineering & Technology

2nd Semester - Common to all branch

1 / 20

Category: Basic Electricity

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

A) Apparent power

B) none of the above

C) True power

D) Reactive power

2 / 20

Category: Circuit Theory & Network

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

A) Minimum

B) Zero

C) Maximum

D) a very small amount

3 / 20

Category: Circuit Theory & Network

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

A) 1

B) 0.81

C) 0.111

D) 1.111

Q factor is the reciprocal of the power factor

4 / 20

Category: Circuit Theory & Network

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

A) True component of current

B) Watt-less component of current

C) none

D) Active component of current

5 / 20

Category: Circuit Theory & Network

5. 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

6 / 20

Category: Circuit Theory & Network

6. In any AC circuit always –

A) Actual power is more than reactive power

B) Reactive power is more than actual power

C) Apparent power is more than actual power

D) Reactive power is more than apparent power

7 / 20

Category: Circuit Theory & Network

7. A parallel AC circuit in resonance will –

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

B) Act like a resister of low value

C) Have a high impedance

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

8 / 20

Category: Circuit Theory & Network

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

A) Zero

B) Lagging

C) Unity

D) Leading

9 / 20

Category: AC Fundamental

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

A) Loss of energy in dielectric

B) Ohmic loss due to Ohmic resistance of plates

C) both A and B

D) Capacitive reactance in ohms

10 / 20

Category: AC Fundamental

10. 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

11 / 20

Category: AC Fundamental

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

A) All of the above

B) R/Z

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

D) Vr/V

12 / 20

Category: AC Fundamental

12. 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) 2 ohm

C) 10 ohm

D) 14 ohm

Z= √ (6^2+8^2) = 10 Ohm

13 / 20

Category: AC Fundamental

13. Unit of impedance is

A) Mho

B) Ohm

C) Farad

D) Henry

14 / 20

Category: AC Fundamental

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

A) Low efficiency

B) Maximum load current

C) Unity power factor

D) High power factor

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

15 / 20

Category: AC Fundamental

15. Reactive power is the product of

A) V, I, sin ø

B) V, I, tan ø

C) V, I, cos ø

D) V, I

16 / 20

Category: AC Fundamental

16. The power factor of practical inductor is

A) Leading

B) Lagging

C) Zero

D) Unity

17 / 20

Category: AC Fundamental

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

A) Lagging

B) unity

C) zero

D) leading

18 / 20

Category: AC Fundamental

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

A) capacitance & supply frequency is more

B) Capacitance & supply frequency is less

C) capacitance is less & supply frequency is more

D) Capacitance is more & supply frequency is less

Xc= 1/2πfC

19 / 20

Category: AC Fundamental

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

A) Average power

B) True power

C) Real power

D) all of the above

20 / 20

Category: AC Fundamental

20. Capacitors for power factor correction are rated in -

A) VA

B) KVAR

C) KW

D) KVA

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The average score is 36%

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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) 6 ohm

B) 2 ohm

C) 9 ohm

D) 18 ohm

2 / 2

Category: AC Machines & Transformer

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

A) 57.7%

B) 66.7%

C) 75%

D) 100%

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The average score is 38%

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Unit- 4 : Transformers and Machines

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2nd Semester

FEEE Unit- 4.1 : Transformer and Machines

Fundamentals of Electrical & Electronics Engineering

Diploma in Engineering & Technology

2nd Semester - Common for all branches

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2nd Semester

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

Fundamentals of Electrical & Electronics Engineering

Diploma in Engineering & Technology

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 - Common to all branch

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2nd Semester

FEEE Unit-4.4 : Auto-transformers

Fundamentals of Electrical & Electronics Engineering

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2nd Semester

FEEE Unit-4.5 : Construction and working principle of motors

Fundamentals of Electrical & Electronics Engineering

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

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