MCQ Quiz on Fundamental of Electrical & Electronics Engineering

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Unit- 1 : Electric and Magnetic Circuits

/20

1 votes, 5 avg

182

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

A) 32 times

B) 4 times

C) 8 times

D) 16 times

2 / 20

Category: Basic Electricity

2. The reciprocal of resistivity is________

A) Conductance

B) Conductivity

C) Impedance

D) Resistance

3 / 20

Category: Basic Electricity

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

A) 5 A

B) 0 A

C) 0.2 A

D) Infinity

4 / 20

Category: Basic Electricity

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

A) Both have equal resistance

B) The 2m wire has higher resistance

C) The 5m wire has higher resistance

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

5 / 20

Category: Basic Electricity

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

A) Polar

B) Non-polar

C) Short

D) Open

6 / 20

Category: Basic Electricity

6. In a pure inductive circuit current is

A) Leads by voltage by 90°

B) Lags by voltage by 0°

C) Lags behind Voltage by 90°

D) Leads by voltage by 0°

7 / 20

Category: Basic Electricity

7. The expression for energy of an inductor

A) ½ LI

B) ½ L^2.I

C) ½ LI^2

D) L/2I

8 / 20

Category: Basic Electricity

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

A) A short circuit

B) Open circuit

C) A normal capacitor as in AC

D) A resistor

9 / 20

Category: Basic Electricity

9. A wire having an area of cross section = 10sqm and another wire having an area of cross section= 15sqm, have the same length and are made up of the same material. Which wire has more resistance?

A) The 10 sqm wire has higher resistance

B) The 15 sqm wire has higher resistance

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

D) Both have equal resistance

10 / 20

Category: Basic Electricity

10. Resistance of any circuit depends on –

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

B) Inversely proportionate with length and cross sectional area

C) Directly proportionate with length and cross sectional area

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

11 / 20

Category: Basic Electricity

11. The Inductor doesn’t allow sudden changes in

A) Inductance

B) Resistance

C) Voltage

D) Current

12 / 20

Category: Basic Electricity

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

A) R= a/( ρ.l)

B) R= ρ. (a/l)

C) R= l/( ρ.a)

D) R=ρ. (l/a)

13 / 20

Category: Basic Electricity

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

A) ohm-meter

B) ohm-meter^2

C) ohm/meter^2

D) ohm/meter

14 / 20

Category: Basic Electricity

14. Frequency of Direct Current is

A) 40 Hz

B) 50 Hz

C) 0 Hz

D) 50 kHz

15 / 20

Category: Basic Electricity

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

A) Brown Black Golden Silver

B) Brown Black Golden Golden

C) Black Brown Black Golden

D) Black Brown Black Silver

16 / 20

Category: Basic Electricity

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

A) Conductors

B) Dielectrics

C) Insulators

D) Semi-conductors

17 / 20

Category: Basic Electricity

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

A) open circuit

B) a normal capacitor as in AC

C) a short circuit

D) a resistor

18 / 20

Category: Basic Electricity

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

A) Q-v

B) Q/v

C) Qv

D) Q + v

19 / 20

Category: Basic Electricity

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

A) Dielectric

B) Capacitive medium

C) Electrode

D) Conducting medium

20 / 20

Category: Basic Electricity

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

A) Coulomb, Faraday

B) Faraday, Henry

C) Henry, Coulomb

D) Henry, Faraday

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. The unit of frequency is the hertz

A) True

B) False

2 / 20

Category: Basic Electricity

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

A) 27°

B) 60°

C) 180°

D) 6°

3 / 20

Category: Basic Electricity

3. A phasor represents

A) The phase angle

B) The width of a quantity

C) The magnitude of a quantity

D) The magnitude and a quantity direction

4 / 20

Category: Basic Electricity

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

A) 12 cycles

B) 1,200 cycles

C) 1/100 cycle

D) 120 cycles

5 / 20

Category: Basic Electricity

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

A) 26.6 V

B) 4 V

C) 2.66 V

D) 18.8 V

6 / 20

Category: Basic Electricity

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

A) 39.6 mA

B) 45.12 mA

C) 16 mA

D) 22.6 mA

7 / 20

Category: Basic Electricity

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

A) 400 Hz

B) 25,000 Hz

C) 2,500 Hz

D) 250 Hz

8 / 20

Category: Basic Electricity

8. 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

9 / 20

Category: Basic Electricity

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

A) True

B) False

10 / 20

Category: Basic Electricity

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

A) 100 Hz

B) 1,000 Hz

C) 10 Hz

D) 50 Hz

Hints:

Frequency = 1/time period

11 / 20

Category: Basic Electricity

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

A) 6.37 V

B) 25.48 V

C) 50.96 V

D) 14.14 V

12 / 20

Category: Basic Electricity

12. 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) 45°

B) 40°

C) None of the above

D) 0°

13 / 20

Category: Basic Electricity

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

A) 20 μs

B) 2 μs

C) 4 μs

D) 100 μs

14 / 20

Category: Basic Electricity

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

A) False

B) True

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) 6.5 V

C) None of the above

D) 13 V

16 / 20

Category: Basic Electricity

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

A) 30%

B) 1%

C) Cannot be determined

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%

17 / 20

Category: Basic Electricity

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

A) 1%

B) 25%

C) 100%

D) 50%

18 / 20

Category: Basic Electricity

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

A) False

B) True

19 / 20

Category: Basic Electricity

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

A) 1.5 mA

B) 1 mA

C) 10 mA

D) 15 mA

20 / 20

Category: AC Fundamental

20. The length of a phasor represents the amplitude

A) False

B) True

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-1.3 : 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. The energy per unit charge is

A) Current

B) Voltage

C) Work

D) Power

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

2 / 16

Category: Basic Electricity

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

A) Voltage

B) Neither voltage nor current

C) Both voltage and current

D) Current

3 / 16

Category: Basic Electricity

3. Ideal voltage source has-

A) Infinity internal resistance

B) Low internal resistance

C) Zero internal resistance

D) High internal resistance

4 / 16

Category: Basic Electricity

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

A) It becomes double its original value

B) It becomes infinity

C) It becomes zero

D) It becomes half its original value

5 / 16

Category: Basic Electricity

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

A) Zero

B) Infinite

C) The value of the source voltage

D) Null

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 continues to glow with the same brightness

B) The other bulb also burns out

C) The other bulb glows with increased brightness

D) The other bulb stops glowing

7 / 16

Category: Basic Electricity

7. Ideal voltage source has-

A) Low internal resistance

B) Infinity internal resistance

C) Zero internal resistance

D) High internal resistance

8 / 16

Category: Basic Electricity

8. Many resistors connected in series will?

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

B) Reduce the power to zero

C) Divide the current proportionally

D) Divide the voltage proportionally among all the resistor

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

A) The amount of time the circuit

B) Proportional to the power in the circuit

C) Proportional to the value of the resistors

D) Equal in all branches

11 / 16

Category: Basic Electricity

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

A) Parallel

B) Neither series nor parallel

C) Series

D) Either series or parallel

12 / 16

Category: Basic Electricity

12. Active circuit have -

A) none of these

B) either a or b

C) one voltage source

D) one current source

13 / 16

Category: Basic Electricity

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

A) Parallel

B) Either series or parallel

C) Series

D) Neither series nor parallel

14 / 16

Category: Basic Electricity

14. If two bulbs are connected in parallel and one bulb blows out, what happens to the other bulb?

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

B) The other bulb glows with increased brightness

C) The other bulb blows out as well

D) The other bulb stops glowing

15 / 16

Category: Basic Electricity

15. Which is the most cost efficient connection?

A) Either series or parallel

B) Series

C) Parallel

D) Neither series nor parallel

16 / 16

Category: Basic Electricity

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

A) The same for all resistors

B) Is divided proportionally across all resistors

C) Is divided equally among all resistors

D) Is zero for all resistors

Your score is

The average score is 44%

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/16

0 votes, 0 avg

Created on October 14, 2022 By

Electrical Notebook

2nd Semester

FEEE Unit-1.4 : Simple problems on source transformation

Fundamentals of Electrical & Electronics Engineering

Diploma in Engineering & Technology

2nd Semester - Common to all branch

1 / 16

Category: Basic Electricity

1. The currents in the three branches of a parallel circuit are 3 A, 4 A and 5 A. What is the current leaving it?

A) The largest one among the three values

B) 12 A

C) Insufficient data provide

D) 0 A

Hints:

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

2 / 16

Category: Basic Electricity

2. The voltage across the short is?

A) Zero

B) Infinity

C) 135 V

D) 11.25 V

Hints:

As there is no resistance i.e. directly shorted across the voltage souce, so there will be no voltage drop and infinity current will flow through the short circuit path. So voltage drop will be zero.

3 / 16

Category: Basic Electricity

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

A) 0.48 ohm

B) 7.67 ohm

C) 0 ohm

D) 7 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.

4 / 16

Category: Basic Electricity

4. Calculate the equivalent resistance between A and B

A) 26.67 ohm

B) 46.67 ohm

C) 10.67 ohm

D) 6.67 ohm

Hints:

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

5 / 16

Category: Basic Electricity

5. Find the current in the circuit.

A) 2 A

B) 3 A

C) 4 A

D) 1 A

6 / 16

Category: Basic Electricity

6. Calculate the current across the 20 ohm resistor

A) 6.67 A

B) 36.67 A

C) 10 A

D) 20 A

7 / 16

Category: Basic Electricity

7. Find the voltage across the 6 ohm resistor

A) 54.48 V

B) 181.6 V

C) 150 V

D) 27.27 V

8 / 16

Category: Basic Electricity

8. 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.

9 / 16

Category: Basic Electricity

9. Calculate the equivalent resistance between A and B

A) 48 ohm

B) 15 ohm

C) 12 ohm

D) 60 ohm

Hints:

5 ohm and 15 ohm are connected in series to give 20 ohm.10ohm and 20 ohm are connected in series to give 30 ohm. Now both equivalent resistances (20ohm and 30 ohm) are in parallel to give equivalent resistance 20*30/(20+30) = 12 ohm.

10 / 16

Category: Basic Electricity

10. The voltage across the open circuit is?

A) 90 V

B) Infinity

C) 100 V

D) 0 V

11 / 16

Category: Basic Electricity

11. Calculate the resistance between A and B

A) 7 ohm

B) 3.56 ohm

C) 14.26 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.

12 / 16

Category: Basic Electricity

12. Calculate the total current in the circuit

A) 15 A

B) 11.43 A

C) 10 A

D) 20 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.

13 / 16

Category: Basic Electricity

13. The total resistance between A and B are?

A) 80 ohm

B) 20 ohm

C) 5 ohm

D) 0 ohm

14 / 16

Category: Basic Electricity

14. Voltage across the 60 ohm resistor is______

A) 72 V

B) 48 V

C) 120 V

D) 0 V

15 / 16

Category: Basic Electricity

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

A) 15 ohm

B) 75 ohm

C) 25 ohm

D) 55 ohm

16 / 16

Category: Basic Electricity

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

A) 135 ohm

B) 12 ohm

C) 27 ohm

D) 5 ohm

Hints:

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

Your score is

The average score is 40%

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Unit- 2 : Electric and Magnetic Circuits

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Created on October 13, 2022 By

Electrical Notebook

2nd Semester

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

Fundamentals of Electrical & Electronics Engineering

Diploma in Engineering & Technology

2nd Semester - Common for all branches

1 / 13

Category: Magnetic Circuit

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

A) voltage

B) Electromotive force

C) Magnetomotive force

D) Electromotive difference

2 / 13

Category: Basic Electricity

2. Instantaneous power in inductor is proportional to the –

A) Temperature of the inductor

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

C) Square of rate of change of current

D) Square of instantaneous current

3 / 13

Category: Basic Electricity

3. Electric pressure is also called –

A) Energy

B) Voltage

C) Conductance

D) Resistance

4 / 13

Category: Basic Electricity

4. S.I unit of Power is –

A) Watt

B) Coulomb

C) Joule

D) Watt-hr

5 / 13

Category: Basic Electricity

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

A) all the three will glow

B) The other two lamps will glow

C) no bulb will glow

D) Total current in the circuit will increase

6 / 13

Category: Basic Electricity

6. S.I unit of conductance is –

A) Ohm-m

B) Mho

C) Mho-m

D) Ohm

7 / 13

Category: Basic Electricity

7. In case of D.C –

A) Direction of current changes with time

B) Magnitude and direction both change with time

C) Magnitude of current changes with time

D) Magnitude and direction remains constant

8 / 13

Category: Basic Electricity

8. 1 coulomb charge equals the charge of –

A) 6.24×10^-18 electrons

B) 6.24×10^12 electrons

C) 6.24×10^16 electrons

D) 6.24×10^18 electrons

9 / 13

Category: Basic Electricity

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

A) Ammeter

B) Voltmeter

C) Ohmmeter

D) Multimeter

10 / 13

Category: Basic Electricity

10. KWh is the unit of -

A) Power

B) Energy

C) Work

D) Efficiency

11 / 13

Category: Basic Electricity

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

A) electrons & ions

B) electrons

C) positive charges

D) Atoms

12 / 13

Category: Basic Electricity

12. Insulating material can –

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

B) Protect a short circuit between two conductors

C) Store varying voltage

D) Conduct very large current

13 / 13

Category: AC Fundamental

13. Average power taken by a pure capacitor is –

A) Zero

B) Unity

C) Maximum

D) Minimum

Your score is

The average score is 63%

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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: Magnetic Circuit

1. In a electric circuit MMF is similar to

A) Current

B) Flux

C) Electromotive force

D) Resistance

2 / 20

Category: Magnetic Circuit

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

A) number of turns in the circuit

B) Reluctance

C) Magnitude of current

D) either b or c

3 / 20

Category: Magnetic Circuit

3. S.I unit of Reluctance-

A) AT/Wb

B) N/Wb

C) AT/m

D) AT

4 / 20

Category: Magnetic Circuit

4. Paramagnetic materials are –

A) Strongly attracted by a magnet

B) slightly attracted by a magnet

C) none

D) strongly repelled by a magnet

5 / 20

Category: Magnetic Circuit

5. Magnetic field has -

A) only magnitude

B) none

C) Only direction

D) both magnitude & direction

6 / 20

Category: Magnetic Circuit

6. The unit of magnetic flux is –

A) Henry

B) Weber

C) Ampere turns

D) Tesla

7 / 20

Category: Magnetic Circuit

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

A) Electromagnetic fields

B) Electromagnets

C) Electromagnetism field

D) Electric magnets

8 / 20

Category: Magnetic Circuit

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

A) Current

B) Emf

C) None

D) Voltage drop

9 / 20

Category: Magnetic Circuit

9. Hysteresis loss least depends on –

A) steinmetz coefficient of material

B) ambient temperature

C) frequency

D) volume of material

10 / 20

Category: Magnetic Circuit

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

A) Multi turn coil

B) both a and c

C) Insulator

D) Solenoid

11 / 20

Category: Magnetic Circuit

11. Magnetic lines of forces –

A) often intersect

B) are not predictable

C) never intersect

D) intersect only in some special circumstances

12 / 20

Category: Magnetic Circuit

12. Magnetic field strength is

A) N.ø/I

B) N.i

C) None of these

D) N.i / L

13 / 20

Category: Magnetic Circuit

13. Which of the following is unit less?

A) Magnetic susceptibility

B) Permeability

C) Moment of Magnet

D) Permittivity

14 / 20

Category: Magnetic Circuit

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

A) Oersted

B) WB/m²

C) Both A & B

D) Tesla

15 / 20

Category: Magnetic Circuit

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

A) rapid reversals of its magnetisation

B) flux density lagging behind magnetising force

C) its high retentivity

D) molecular friction

16 / 20

Category: Magnetic Circuit

16. Magnetic field is proportional to the –

A) direction of electric charges

B) all of these

C) Speed of electric charges

D) Quality of electric charges

17 / 20

Category: Magnetic Circuit

17. Magnetic circuit is a closed path followed by –

A) flux

B) M.M.F

C) Flux density

D) None of these

18 / 20

Category: Magnetic Circuit

18. The reciprocal of permeability is –

A) Resistivity

B) reluctivity

C) Conductivity

D) MMF

19 / 20

Category: AC Fundamental

19. Absolute permittivity of dielectric medium is represented as –

A) ε0

B) ε0 εr

C) εr

D) εr /ε0

20 / 20

Category: Basic Electricity

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

A) zero

B) high

C) unity

D) Low

Your score is

The average score is 71%

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Created on October 14, 2022 By

Electrical Notebook

2nd Semester

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

Fundamentals of Electrical & Electronics Engineering

Diploma in Engineering & Technology

2nd Semester - Common to all branch

1 / 4

Category: Magnetic Circuit

1. An open coil has –

A) Zero resistance and high inductance

B) Infinite resistance and normal inductance

C) Infinite resistance and zero inductance

D) Zero resistance and inductance

2 / 4

Category: Magnetic Circuit

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

A) Faraday

B) Lenz

C) Newton

D) Coulomb

3 / 4

Category: Magnetic Circuit

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

A) Tend to decrease the amount of current

B) Aid the applied voltage

C) Aid the increasing current

D) Produce current opposite to the increasing current

4 / 4

Category: Magnetic Circuit

4. The principle of electromagnetic induction was propounded by

A) Orsted

B) Edison

C) Flemmings

D) Faraday

Your score is

The average score is 58%

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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: AC Fundamental

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

A) High Inductance

B) High impedance

C) High capacitance

D) Low impedance

2 / 6

Category: Basic Electricity

2. Electrolysis is possible with –

A) none

B) A.C supply only

C) D.C supply only

D) both A.C and D.C supply

3 / 6

Category: Magnetic Circuit

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

A) Coil resistance

B) None

C) Rate of change of flux

D) Flux magnitude

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) Self-inductance

B) Mutual inductance

C) None

D) Capacitance

5 / 6

Category: AC Machines & Transformer

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

A) Generator

B) Battery

C) Transformer

D) Motor

6 / 6

Category: DC Machines

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

A) Transformer

B) Choke

C) Generator

D) Thermo-couple

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

A) both a and b

B) electric field

C) Magnetic field

D) none

2 / 12

Category: AC Fundamental

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

A) Q^2 / 2C

B) 1/2 QV

C) All of the above

D) 1/2 CV^2

3 / 12

Category: Magnetic Circuit

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

A) L / 2I^2 t

B) LI / 2t

C) LI^2/ 2t

D) L / 2It

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

4 / 12

Category: Magnetic Circuit

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

A) 15 J

B) 60 J

C) 90 J

D) 20 J

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

5 / 12

Category: Magnetic Circuit

5. Higher the self-inductance of a coil –

A) Greater the flux produced by it

B) Lesser its Weber-turns

C) lower the E.M.F. induced

D) longer the delay in establishing steady current through it

6 / 12

Category: Magnetic Circuit

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

A) 0

B) I/4

C) I

D) I/2

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

7 / 12

Category: Magnetic Circuit

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

A) LI^2

B) LI^2 / 2

C) L^2 I / 2

D) IL^2

8 / 12

Category: Magnetic Circuit

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

A) I

B) I/4

C) I/2

D) 0

9 / 12

Category: Magnetic Circuit

9. 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) 220 J

C) 190 J

D) 160 J

Hints:

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

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) 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.

11 / 12

Category: Magnetic Circuit

11. 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) initially increase and then decrease

C) Remain the same

D) decrease

12 / 12

Category: Magnetic Circuit

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

A) quadrupled

B) halved

C) Unaffected

D) doubled

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