MCQ Quiz on Fundamental of Electrical & Electronics Engineering

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Unit- 1 : Electric and Magnetic Circuits

/20

1 votes, 5 avg

322

Created on October 13, 2022 By

Electrical Notebook

2nd Semester

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

Fundamentals of Electrical & Electronics Engineering

Diploma in Engineering & Technology

2nd Semester - Common to all branch

1 / 20

Category: Basic Electricity

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

A) open circuit

B) a resistor

C) a normal capacitor as in AC

D) a short circuit

2 / 20

Category: Basic Electricity

2. In a pure inductive circuit current is

A) Lags behind Voltage by 90°

B) Lags by voltage by 0°

C) Leads by voltage by 90°

D) Leads by voltage by 0°

3 / 20

Category: Basic Electricity

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

A) Dielectric

B) Conducting medium

C) Capacitive medium

D) Electrode

4 / 20

Category: Basic Electricity

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

A) Non-polar

B) Polar

C) Open

D) Short

5 / 20

Category: Basic Electricity

5. What is the resistivity of Copper?

A) 7.3×10^-8 ohm-m

B) 2.7×10^-8 ohm-m

C) 1.59×10^-8 ohm-m

D) 5.35×10^-8 ohm-m

6 / 20

Category: Basic Electricity

6. Unit of resistivity is

A) Ohm

B) Ohm-m²

C) Ohm/m

D) Ohm-m

7 / 20

Category: Basic Electricity

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

A) 0

B) 1

C) Infinity

D) -1

Hints: I= c.(dv/dt)

8 / 20

Category: Basic Electricity

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

A) 15 J

B) 60 J

C) 90 J

D) 20 J

9 / 20

Category: Basic Electricity

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

A) 50.625 W

B) 5062.5 W

C) 50625 W

D) 506.25 W

Apply E= ½ cv².

10 / 20

Category: Basic Electricity

10. The expression for energy of an inductor

A) ½ L^2.I

B) ½ LI

C) L/2I

D) ½ LI^2

11 / 20

Category: Basic Electricity

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

A) 8 times

B) 32 times

C) 16 times

D) 4 times

12 / 20

Category: Basic Electricity

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

A) ohm/meter^2

B) ohm-meter^2

C) ohm/meter

D) ohm-meter

13 / 20

Category: Basic Electricity

13. The Inductor doesn’t allow sudden changes in

A) Inductance

B) Voltage

C) Current

D) Resistance

14 / 20

Category: Basic Electricity

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

A) The 5m wire has higher resistance

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

C) Both have equal resistance

D) The 2m wire has higher resistance

15 / 20

Category: Basic Electricity

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

A) R=ρ. (l/a)

B) R= ρ. (a/l)

C) R= a/( ρ.l)

D) R= l/( ρ.a)

16 / 20

Category: Basic Electricity

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

A) Black Brown Black Silver

B) Brown Black Golden Silver

C) Black Brown Black Golden

D) Brown Black Golden Golden

17 / 20

Category: Basic Electricity

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

A) Total current in the circuit will increase

B) all the three will glow

C) no bulb will glow

D) The other two lamps will glow

18 / 20

Category: Basic Electricity

18. 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= l/( ρ.a)

D) R=ρ. (l/a)

19 / 20

Category: Basic Electricity

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

A) 16 kiloohm-meter

B) 8 ohm-meter

C) 16 ohm-meter

D) 8 kilo ohm-meter

Hints:

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

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

20 / 20

Category: Basic Electricity

20. Resistance of any circuit depends on –

A) Directly proportionate with length and cross sectional area

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

C) Inversely proportionate with length and cross sectional area

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

A) 180°

B) 27°

C) 60°

D) 6°

2 / 20

Category: Basic Electricity

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

A) True

B) False

3 / 20

Category: Basic Electricity

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

A) 1/100 cycle

B) 12 cycles

C) 1,200 cycles

D) 120 cycles

4 / 20

Category: Basic Electricity

4. A phasor represents

A) The width of a quantity

B) The magnitude of a quantity

C) The magnitude and a quantity direction

D) The phase angle

5 / 20

Category: Basic Electricity

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

A) False

B) True

6 / 20

Category: Basic Electricity

6. 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) 0°

C) 40°

D) 45°

7 / 20

Category: Basic Electricity

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

A) True

B) False

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) 18.8 V

B) 2.66 V

C) 4 V

D) 26.6 V

9 / 20

Category: Basic Electricity

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

A) 20 μs

B) 4 μs

C) 2 μs

D) 100 μs

10 / 20

Category: Basic Electricity

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

A) True

B) False

11 / 20

Category: Basic Electricity

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

A) 14.14 V

B) 50.96 V

C) 6.37 V

D) 25.48 V

12 / 20

Category: Basic Electricity

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

A) 22.6 mA

B) 16 mA

C) 39.6 mA

D) 45.12 mA

13 / 20

Category: Basic Electricity

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

A) 10 Hz

B) 50 Hz

C) 100 Hz

D) 1,000 Hz

Hints:

Frequency = 1/time period

14 / 20

Category: Basic Electricity

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

A) 25%

B) 1%

C) 50%

D) 100%

15 / 20

Category: Basic Electricity

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

A) 26 V

B) 13 V

C) None of the above

D) 6.5 V

16 / 20

Category: Basic Electricity

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

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) 1 mA

D) 10 mA

18 / 20

Category: Basic Electricity

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

A) 250 Hz

B) 400 Hz

C) 25,000 Hz

D) 2,500 Hz

19 / 20

Category: Basic Electricity

19. The unit of frequency is the hertz

A) False

B) True

20 / 20

Category: AC Fundamental

20. The length of a phasor represents the amplitude

A) True

B) False

Your score is

The average score is 43%

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/16

0 votes, 0 avg

Created on October 14, 2022 By

Electrical Notebook

2nd Semester

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

Fundamentals of Electrical & Electronics Engineering

Diploma in Engineering & Technology

2nd Semester - Common to all branch

1 / 16

Category: Basic Electricity

1. Ideal voltage source has-

A) Low internal resistance

B) High internal resistance

C) Infinity internal resistance

D) Zero internal resistance

2 / 16

Category: Basic Electricity

2. Active circuit have -

A) either a or b

B) one current source

C) none of these

D) one voltage source

3 / 16

Category: Basic Electricity

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

A) Is divided proportionally across all resistors

B) The same for all resistors

C) Is divided equally among all resistors

D) Is zero for all resistors

4 / 16

Category: Basic Electricity

4. Which is the most cost efficient connection?

A) Neither series nor parallel

B) Series

C) Either series or parallel

D) Parallel

5 / 16

Category: Basic Electricity

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

A) It becomes infinity

B) It becomes zero

C) It becomes half its original value

D) It becomes double its original value

6 / 16

Category: Basic Electricity

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

A) Neither series nor parallel

B) Series

C) Either series or parallel

D) Parallel

7 / 16

Category: Basic Electricity

7. Many resistors connected in series will?

A) Divide the voltage proportionally among all the resistor

B) Divide the current proportionally

C) Reduce the power to zero

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

8 / 16

Category: Basic Electricity

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

A) Both voltage and current

B) Current

C) Neither voltage nor current

D) Voltage

9 / 16

Category: Basic Electricity

9. 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 continues to glow with the same brightness

D) The other bulb stops glowing

10 / 16

Category: Basic Electricity

10. 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

11 / 16

Category: Basic Electricity

11. 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 glows with increased brightness

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

12 / 16

Category: Basic Electricity

12. Ideal voltage source has-

A) Zero internal resistance

B) Infinity internal resistance

C) High internal resistance

D) Low internal resistance

13 / 16

Category: Basic Electricity

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

A) Either series or parallel

B) Neither series nor parallel

C) Parallel

D) Series

14 / 16

Category: Basic Electricity

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

A) Proportional to the power in the circuit

B) Equal in all branches

C) The amount of time the circuit

D) Proportional to the value of the resistors

15 / 16

Category: Basic Electricity

15. Batteries are generally connected in______

A) Parallel

B) Either series or parallel

C) Neither series nor parallel

D) Series

16 / 16

Category: Basic Electricity

16. The energy per unit charge is

A) Power

B) Work

C) Current

D) Voltage

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

Your score is

The average score is 40%

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/16

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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 current across the 20 ohm resistor

A) 10 A

B) 20 A

C) 6.67 A

D) 36.67 A

2 / 16

Category: Basic Electricity

2. Calculate the total current in the circuit

A) 20 A

B) 15 A

C) 11.43 A

D) 10 A

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

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) 15 ohm

C) 25 ohm

D) 55 ohm

4 / 16

Category: Basic Electricity

4. The total resistance between A and B are?

A) 5 ohm

B) 20 ohm

C) 80 ohm

D) 0 ohm

5 / 16

Category: Basic Electricity

5. The voltage across the short is?

A) Infinity

B) 135 V

C) Zero

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.

6 / 16

Category: Basic Electricity

6. Calculate the resistance between A and B

A) 29.69 ohm

B) 14.26 ohm

C) 7 ohm

D) 3.56 ohm

Hints:

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

7 / 16

Category: Basic Electricity

7. 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.

8 / 16

Category: Basic Electricity

8. 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) Insufficient data provide

C) 0 A

D) The largest one among the three values

Hints:

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

9 / 16

Category: Basic Electricity

9. The voltage across the open circuit is?

A) 90 V

B) 100 V

C) Infinity

D) 0 V

10 / 16

Category: Basic Electricity

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

A) 0 ohm

B) 0.48 ohm

C) 7 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.

11 / 16

Category: Basic Electricity

11. Find the current in the circuit.

A) 3 A

B) 4 A

C) 1 A

D) 2 A

12 / 16

Category: Basic Electricity

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

A) 12 ohm

B) 27 ohm

C) 5 ohm

D) 135 ohm

Hints:

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

13 / 16

Category: Basic Electricity

13. Calculate the equivalent resistance between A and B

A) 2 ohm

B) 6 ohm

C) 4 ohm

D) 8 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.

14 / 16

Category: Basic Electricity

14. Voltage across the 60 ohm resistor is______

A) 48 V

B) 120 V

C) 0 V

D) 72 V

15 / 16

Category: Basic Electricity

15. Calculate the equivalent resistance between A and B

A) 15 ohm

B) 48 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.

16 / 16

Category: Basic Electricity

16. Find the voltage across the 6 ohm resistor

A) 27.27 V

B) 181.6 V

C) 54.48 V

D) 150 V

Your score is

The average score is 39%

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Unit- 2 : Electric and Magnetic Circuits

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Created on October 13, 2022 By

Electrical Notebook

2nd Semester

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

Fundamentals of Electrical & Electronics Engineering

Diploma in Engineering & Technology

2nd Semester - Common for all branches

1 / 13

Category: AC Fundamental

1. Average power taken by a pure capacitor is –

A) Unity

B) Maximum

C) Zero

D) Minimum

2 / 13

Category: Magnetic Circuit

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

A) Magnetomotive force

B) voltage

C) Electromotive force

D) Electromotive difference

3 / 13

Category: Basic Electricity

3. S.I unit of Power is –

A) Joule

B) Watt

C) Coulomb

D) Watt-hr

4 / 13

Category: Basic Electricity

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

A) Ammeter

B) Voltmeter

C) Ohmmeter

D) Multimeter

5 / 13

Category: Basic Electricity

5. KWh is the unit of -

A) Energy

B) Work

C) Efficiency

D) Power

6 / 13

Category: Basic Electricity

6. 1 coulomb charge equals the charge of –

A) 6.24×10^16 electrons

B) 6.24×10^18 electrons

C) 6.24×10^-18 electrons

D) 6.24×10^12 electrons

7 / 13

Category: Basic Electricity

7. Instantaneous power in inductor is proportional to the –

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

B) Square of instantaneous current

C) Temperature of the inductor

D) Square of rate of change of current

8 / 13

Category: Basic Electricity

8. In case of D.C –

A) Magnitude and direction both change with time

B) Magnitude and direction remains constant

C) Magnitude of current changes with time

D) Direction of current changes with time

9 / 13

Category: Basic Electricity

9. Insulating material can –

A) Conduct very large current

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

C) Store varying voltage

D) Protect a short circuit between two conductors

10 / 13

Category: Basic Electricity

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

A) electrons & ions

B) electrons

C) Atoms

D) positive charges

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) Total current in the circuit will increase

B) The other two lamps will glow

C) all the three will glow

D) no bulb will glow

12 / 13

Category: Basic Electricity

12. Electric pressure is also called –

A) Resistance

B) Energy

C) Conductance

D) Voltage

13 / 13

Category: Basic Electricity

13. S.I unit of conductance is –

A) Ohm

B) Mho

C) Mho-m

D) Ohm-m

Your score is

The average score is 52%

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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) unity

B) zero

C) Low

D) high

2 / 20

Category: Magnetic Circuit

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

A) either b or c

B) Magnitude of current

C) number of turns in the circuit

D) Reluctance

3 / 20

Category: Magnetic Circuit

3. Paramagnetic materials are –

A) Strongly attracted by a magnet

B) strongly repelled by a magnet

C) none

D) slightly attracted by a magnet

4 / 20

Category: Magnetic Circuit

4. Magnetic field strength is

A) N.ø/I

B) N.i / L

C) N.i

D) None of these

5 / 20

Category: Magnetic Circuit

5. 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) Solenoid

D) Insulator

6 / 20

Category: Magnetic Circuit

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

A) Electromagnetism field

B) Electromagnetic fields

C) Electromagnets

D) Electric magnets

7 / 20

Category: Magnetic Circuit

7. Magnetic lines of forces –

A) often intersect

B) are not predictable

C) never intersect

D) intersect only in some special circumstances

8 / 20

Category: Magnetic Circuit

8. S.I unit of Reluctance-

A) N/Wb

B) AT

C) AT/Wb

D) AT/m

9 / 20

Category: Magnetic Circuit

9. The unit of magnetic flux is –

A) Tesla

B) Henry

C) Weber

D) Ampere turns

10 / 20

Category: Magnetic Circuit

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

A) WB/m²

B) Tesla

C) Oersted

D) Both A & B

11 / 20

Category: Magnetic Circuit

11. Magnetic circuit is a closed path followed by –

A) None of these

B) M.M.F

C) Flux density

D) flux

12 / 20

Category: Magnetic Circuit

12. In a electric circuit MMF is similar to

A) Current

B) Flux

C) Electromotive force

D) Resistance

13 / 20

Category: Magnetic Circuit

13. The reciprocal of permeability is –

A) Conductivity

B) Resistivity

C) MMF

D) reluctivity

14 / 20

Category: Magnetic Circuit

14. Magnetic field has -

A) only magnitude

B) none

C) both magnitude & direction

D) Only direction

15 / 20

Category: Magnetic Circuit

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

A) Emf

B) None

C) Current

D) Voltage drop

16 / 20

Category: Magnetic Circuit

16. Magnetic field is proportional to the –

A) Quality of electric charges

B) direction of electric charges

C) all of these

D) Speed of electric charges

17 / 20

Category: Magnetic Circuit

17. Hysteresis loss least depends on –

A) volume of material

B) steinmetz coefficient of material

C) ambient temperature

D) frequency

18 / 20

Category: Magnetic Circuit

18. Which of the following is unit less?

A) Moment of Magnet

B) Permittivity

C) Permeability

D) Magnetic susceptibility

19 / 20

Category: Magnetic Circuit

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

A) flux density lagging behind magnetising force

B) its high retentivity

C) rapid reversals of its magnetisation

D) molecular friction

20 / 20

Category: AC Fundamental

20. Absolute permittivity of dielectric medium is represented as –

A) ε0

B) ε0 εr

C) εr

D) εr /ε0

Your score is

The average score is 48%

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Created on October 14, 2022 By

Electrical Notebook

2nd Semester

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

Fundamentals of Electrical & Electronics Engineering

Diploma in Engineering & Technology

2nd Semester - Common to all branch

1 / 4

Category: Magnetic Circuit

1. The principle of electromagnetic induction was propounded by

A) Edison

B) Orsted

C) Flemmings

D) Faraday

2 / 4

Category: Magnetic Circuit

2. An open coil has –

A) Zero resistance and high inductance

B) Zero resistance and inductance

C) Infinite resistance and zero inductance

D) Infinite resistance and normal inductance

3 / 4

Category: Magnetic Circuit

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

A) Aid the applied voltage

B) Aid the increasing current

C) Produce current opposite to the increasing current

D) Tend to decrease the amount of current

4 / 4

Category: Magnetic Circuit

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

A) Newton

B) Faraday

C) Lenz

D) Coulomb

Your score is

The average score is 59%

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Created on October 14, 2022 By

Electrical Notebook

2nd Semester

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

Fundamentals of Electrical & Electronics Engineering

Diploma in Engineering & Technology

2nd Semester - Common to all branch

1 / 6

Category: Basic Electricity

1. Electrolysis is possible with –

A) D.C supply only

B) both A.C and D.C supply

C) none

D) A.C supply only

2 / 6

Category: DC Machines

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

A) Generator

B) Transformer

C) Thermo-couple

D) Choke

3 / 6

Category: Magnetic Circuit

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

A) Flux magnitude

B) Coil resistance

C) Rate of change of flux

D) None

4 / 6

Category: Magnetic Circuit

4. 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) Self-inductance

D) Capacitance

5 / 6

Category: AC Fundamental

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

A) High capacitance

B) High impedance

C) Low impedance

D) High Inductance

6 / 6

Category: AC Machines & Transformer

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

A) Battery

B) Generator

C) Motor

D) Transformer

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The average score is 50%

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/12

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Created on October 14, 2022 By

Electrical Notebook

2nd Semester

FEEE Unit-2.5 : Energy stored in magnetic circuit

Fundamentals of Electrical & Electronics Engineering

Diploma in Engineering & Technology

2nd Semester - Common to all branch

1 / 12

Category: AC Fundamental

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

A) 1/2 QV

B) Q^2 / 2C

C) 1/2 CV^2

D) All of the above

2 / 12

Category: AC Fundamental

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

A) Magnetic field

B) electric field

C) both a and b

D) none

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) Remain the same

B) decrease

C) initially increase and then decrease

D) Increase

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/2

C) I/4

D) I

5 / 12

Category: Magnetic Circuit

5. 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) 90 J

C) 60 J

D) 15 J

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

6 / 12

Category: Magnetic Circuit

6. 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) 220 J

D) 160 J

Hints:

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

7 / 12

Category: Magnetic Circuit

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

A) Unaffected

B) quadrupled

C) doubled

D) halved

8 / 12

Category: Magnetic Circuit

8. Higher the self-inductance of a coil –

A) Lesser its Weber-turns

B) lower the E.M.F. induced

C) Greater the flux produced by it

D) longer the delay in establishing steady current through it

9 / 12

Category: Magnetic Circuit

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

A) I/2

B) I/4

C) 0

D) I

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

10 / 12

Category: Magnetic Circuit

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

A) LI^2 / 2

B) LI^2

C) L^2 I / 2

D) IL^2

11 / 12

Category: Magnetic Circuit

11. 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.

12 / 12

Category: Magnetic Circuit

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

A) 5 V

B) 2.5 V

C) 1.5 V

D) 3.5 V

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

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The average score is 51%

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Electrical Notebook

2nd Semester

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

Fundamentals of Electrical & Electronics Engineering

Diploma in Engineering & Technology

2nd Semester - Common to all branch

1 / 5

Category: DC Machines

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

A) Flemmings Right hand rule

B) Flemmings Left hand rule

C) Left hand thumb rule

D) Pulm rule

2 / 5

Category: DC Machines

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

A) Flemmings Left hand rule

B) Left hand thumb rule

C) Flemmings Right hand rule

D) Palm rule

3 / 5

Category: Magnetic Circuit

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

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

B) The piece of metal will lose it magnetism

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

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

4 / 5

Category: Magnetic Circuit

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

A) Faraday's Right Hand Rule

B) Fleming's Left Hand Rule

C) Faraday's Left Hand Rule

D) Fleming's Right Hand Rule

5 / 5

Category: Magnetic Circuit

5. A magnetic field like this is called –

A) a distorted field

B) a paramagnetic field

C) A parallel field

D) A uniform field

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The average score is 43%

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2nd Semester

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

Fundamentals of Electrical & Electronics Engineering

Diploma in Engineering & Technology

2nd Semester - Common to all branch

1 / 2

Category: Basic Electricity

1. 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) 5 kWh

B) 1 kWh

C) 4 kWh

D) 2 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 kWh

C) 0.05 Wh

D) 5 kWh

Hints:

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

Your score is

The average score is 36%

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Unit- 3 : AC Circuits

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Electrical Notebook

2nd Semester

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

Fundamental of Electrical & Electronics Engineering

Diploma in Engineering & Technology

2nd Semester - Common to all branches

1 / 20

Category: AC Fundamental

1. Form factor of half wave rectified ac is-

A) 1.11

B) 1.41

C) 2

D) 1.57

2 / 20

Category: AC Fundamental

2. 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 the same frequency

C) Not a sinusoid

D) A sinusoid of double the frequency

3 / 20

Category: AC Fundamental

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

A) Voltage

B) Heating effect

C) Current

D) Charge transfer

4 / 20

Category: AC Fundamental

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

A) π Hz

B) 2π Hz

C) 1 Hz

D) None

Hints:

v= Vm sin 2πft volt

here f=1 Hz

5 / 20

Category: AC Fundamental

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

A) All of these

B) L only

C) C only

D) R only

6 / 20

Category: AC Fundamental

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

A) Heating effect

B) Charge transfers

C) Voltage

D) Current

7 / 20

Category: AC Fundamental

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

A) 0°

B) 360°

C) 180°

D) 90°

8 / 20

Category: AC Fundamental

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

A) 141.4 V

B) 127.4 V

C) 200 V

D) 282.8 V

Hints:

Peak factor = Max value/rms value = 1.41

rms value = 200/1.41 = 141.8 V

Form factor = rms value / avarage value = 1.11

Avarage value = 141.84/1.11 = 127.7 V

9 / 20

Category: AC Fundamental

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

A) 70.7 A

B) 282.8 A

C) 141 A

D) 150 A

Hints: Peak factor of sine wave = 1.41

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

10 / 20

Category: AC Fundamental

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

A) I R.M.S.

B) I max Lm value

C) I average value

D) None

11 / 20

Category: AC Fundamental

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

A) RMS voltage

B) Peak voltage

C) None

D) Average voltage

12 / 20

Category: AC Fundamental

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

A) 20 Hz

B) 50 Hz

C) 5 Hz

D) 30 Hz

13 / 20

Category: AC Fundamental

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

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

B) Less insulation is required in case of AC

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

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

14 / 20

Category: AC Fundamental

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

A) 0.637

B) 1.11

C) 1.414

D) 0.707

Hints:

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

15 / 20

Category: AC Fundamental

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

A) Conductance, Susceptance

B) Permeance and Susceptance

C) Resistance and Reactance

D) Reluctance and Permeance

16 / 20

Category: AC Fundamental

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

A) 1.11

B) 1.41

C) 0.707

D) 1

17 / 20

Category: AC Fundamental

17. The frequency of an alternating current is –

A) The number of cycles generated in one minute

B) The speed with which the alternator runs

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

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

18 / 20

Category: AC Fundamental

18. Form factor of square wave is-

A) 1.47

B) 1.41

C) 1

D) 2

19 / 20

Category: AC Fundamental

19. 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) None

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

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

20 / 20

Category: AC Fundamental

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

A) 50 π

B) 5 π

C) 25 π

D) 100 π

Hints:

Angular frequency = 2πf rad/sec = 100π

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) 100 A

B) 70.72 A

C) 707.2 A

D) 7.07 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) 0.04 sec

C) 0.05 sec

D) 0.01 sec

Hints:

2πf= 628

f=628/2π = 99.94 Hz

t= 1/f = 0.01 sec

3 / 4

Category: AC Fundamental

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

A) 100 Hz

B) 50 Hz

C) 75 Hz

D) 314 Hz

4 / 4

Category: AC Fundamental

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

A) None

B) 25 Hz

C) 60 Hz

D) 50 Hz

Hints:

2πf = 314

f= 314/2π = 49.97 Hz = 50 Hz

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The average score is 43%

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2nd Semester

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

Fundamentals of Electrical & Electronics Engineering

Diploma in Engineering & Technology

2nd Semester - Common to all branch

1 / 5

Category: Basic Electricity

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

A) 0.707

B) 1.414

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 series R-C circuit, the applied voltage –

A) 90° lags the current

B) 90° leads the current

C) lags the current

D) leads the current

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

A) R-L-C all

B) R only

C) L only

D) C only

5 / 5

Category: AC Fundamental

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

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

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

C) Voltage across R and L are in phase

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

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The average score is 31%

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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. For a sinusoidal AC voltage, amplitude factor is –

A) 1.414

B) 0.637

C) 1.11

D) 0.707

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

2 / 5

Category: AC Fundamental

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

A) P/S

B) R/Z

C) All of the above

D) Vr /V

3 / 5

Category: AC Fundamental

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

A) R only

B) R-L-C all

C) C only

D) L only

4 / 5

Category: AC Fundamental

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

A) lags the current

B) 90° leads the current

C) 90° lags the current

D) leads the current

5 / 5

Category: AC Fundamental

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

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

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

C) Voltage across R and L are in phase

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

In an inductive circuit current always lag behind the voltage.

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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) Reactive power

C) none of the above

D) Apparent power

2 / 20

Category: Circuit Theory & Network

2. In any AC circuit always –

A) Reactive power is more than actual power

B) Apparent power is more than actual power

C) Reactive power is more than apparent power

D) Actual power is more than reactive power

3 / 20

Category: Circuit Theory & Network

3. 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

4 / 20

Category: Circuit Theory & Network

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

A) Active component of current

B) none

C) Watt-less component of current

D) True component of current

5 / 20

Category: Circuit Theory & Network

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

A) None

B) Q

C) Bandwidth

D) Resonant frequency

Resonent frequency = 1/2π √(L/C)

6 / 20

Category: Circuit Theory & Network

6. 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

7 / 20

Category: Circuit Theory & Network

7. 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

8 / 20

Category: Circuit Theory & Network

8. A parallel AC circuit in resonance will –

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

B) Have a high impedance

C) Act like a resister of low value

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

9 / 20

Category: AC Fundamental

9. 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

10 / 20

Category: AC Fundamental

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

A) True power

B) Average power

C) Real power

D) all of the above

11 / 20

Category: AC Fundamental

11. The power factor of practical inductor is

A) Unity

B) Leading

C) Lagging

D) Zero

12 / 20

Category: AC Fundamental

12. The power factor of an ordinary electric bulb is

A) Zero

B) Slightly less than unity

C) Slightly more than unity

D) 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: AC Fundamental

13. Capacitors for power factor correction are rated in -

A) KW

B) KVAR

C) KVA

D) VA

14 / 20

Category: AC Fundamental

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

A) zero

B) unity

C) Lagging

D) leading

15 / 20

Category: AC Fundamental

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

A) -1 and 1

B) 0 and -1

C) 0 and 1

D) None of these

16 / 20

Category: AC Fundamental

16. Reactive power is the product of

A) V, I, cos ø

B) V, I, sin ø

C) V, I, tan ø

D) V, I

17 / 20

Category: AC Fundamental

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

A) Maximum load current

B) High power factor

C) Low efficiency

D) Unity power factor

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

18 / 20

Category: AC Fundamental

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

A) 14 ohm

B) 2 ohm

C) 2 ohm

D) 10 ohm

Z= √ (6^2+8^2) = 10 Ohm

19 / 20

Category: AC Fundamental

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

A) capacitance is less & supply frequency is more

B) Capacitance & supply frequency is less

C) capacitance & supply frequency is more

D) Capacitance is more & supply frequency is less

Xc= 1/2πfC

20 / 20

Category: AC Fundamental

20. Unit of impedance is

A) Henry

B) Ohm

C) Farad

D) Mho

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The average score is 39%

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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) 9 ohm

B) 6 ohm

C) 2 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) 66.7%

B) 100%

C) 57.7%

D) 75%

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The average score is 38%

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Unit- 4 : Transformers and Machines

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Created on October 13, 2022 By

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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

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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

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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