MCQ Quiz on Fundamental of Electrical & Electronics Engineering

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Unit- 1 : Electric and Magnetic Circuits

/20

1 votes, 5 avg

328

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 reciprocal of resistivity is________

A) Resistance

B) Impedance

C) Conductivity

D) Conductance

2 / 20

Category: Basic Electricity

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

A) Infinity

B) 0 A

C) 5 A

D) 0.2 A

3 / 20

Category: Basic Electricity

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

A) 60 J

B) 20 J

C) 15 J

D) 90 J

4 / 20

Category: Basic Electricity

4. Unit of resistivity is

A) Ohm-m

B) Ohm-m²

C) Ohm

D) Ohm/m

5 / 20

Category: Basic Electricity

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

A) Short

B) Non-polar

C) Polar

D) Open

6 / 20

Category: Basic Electricity

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

A) ohm-meter^2

B) ohm/meter^2

C) ohm/meter

D) ohm-meter

7 / 20

Category: Basic Electricity

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

A) a short circuit

B) a resistor

C) open circuit

D) a normal capacitor as in AC

8 / 20

Category: Basic Electricity

8. 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 kilo ohm-meter

B) 16 kiloohm-meter

C) 16 ohm-meter

D) 8 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.

9 / 20

Category: Basic Electricity

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

A) 32 times

B) 16 times – of the previous

C) 8 times

D) 4 times

10 / 20

Category: Basic Electricity

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

A) Insulators

B) Semi-conductors

C) Dielectrics

D) Conductors

11 / 20

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) no bulb will glow

D) all the three will glow

12 / 20

Category: Basic Electricity

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

A) 7:5

B) 2:7

C) 5:7

D) 2:5

13 / 20

Category: Basic Electricity

13. The Inductor doesn’t allow sudden changes in

A) Current

B) Inductance

C) Resistance

D) Voltage

14 / 20

Category: Basic Electricity

14. The expression for energy of an inductor

A) ½ LI

B) ½ L^2.I

C) ½ LI^2

D) L/2I

15 / 20

Category: Basic Electricity

15. Which of the following statements are true with regard to resistance?

A) Resistance is directly proportional to an area of cross section of the wire

B) Resistance is inversely proportional to the resistivity of the wire

C) Resistance is inversely proportional to the length of the wire

D) Resistance is directly proportional to a length of the wire

16 / 20

Category: Basic Electricity

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

A) 5062.5 W

B) 50.625 W

C) 50625 W

D) 506.25 W

Apply E= ½ cv².

17 / 20

Category: Basic Electricity

17. A choke coil is a coil having-

A) High inductance high capacitance

B) Low inductance high resistance

C) High inductance negligible resistance

D) Low resistance high capacitance

18 / 20

Category: Basic Electricity

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

A) 4 times

B) 16 times

C) 32 times

D) 8 times

19 / 20

Category: Basic Electricity

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

A) Resistance depends on the temperature

B) Resistivity depend on the length

C) Resistance does not depend on the temperature

D) Resistivity depend on area of cross section

20 / 20

Category: Basic Electricity

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

A) A normal capacitor as in AC

B) A short circuit

C) A resistor

D) Open circuit

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) True

B) False

2 / 20

Category: Basic Electricity

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

A) 100 μs

B) 4 μs

C) 2 μs

D) 20 μs

3 / 20

Category: Basic Electricity

3. 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

4 / 20

Category: Basic Electricity

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

A) True

B) False

5 / 20

Category: Basic Electricity

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

A) 100 Hz

B) 50 Hz

C) 1,000 Hz

D) 10 Hz

Hints:

Frequency = 1/time period

6 / 20

Category: Basic Electricity

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

A) 180°

B) 60°

C) 27°

D) 6°

7 / 20

Category: Basic Electricity

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

A) 26 V

B) None of the above

C) 6.5 V

D) 13 V

8 / 20

Category: Basic Electricity

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

A) 22.6 mA

B) 39.6 mA

C) 45.12 mA

D) 16 mA

9 / 20

Category: Basic Electricity

9. 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) 0°

C) 40°

D) None of the above

10 / 20

Category: Basic Electricity

10. 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) 18.8 V

C) 4 V

D) 26.6 V

11 / 20

Category: Basic Electricity

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

A) 10 mA

B) 15 mA

C) 1 mA

D) 1.5 mA

12 / 20

Category: Basic Electricity

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

A) True

B) False

13 / 20

Category: Basic Electricity

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

A) False

B) True

14 / 20

Category: Basic Electricity

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

A) 120 cycles

B) 1,200 cycles

C) 1/100 cycle

D) 12 cycles

15 / 20

Category: Basic Electricity

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

A) 50%

B) 25%

C) 100%

D) 1%

16 / 20

Category: Basic Electricity

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

A) True

B) False

17 / 20

Category: Basic Electricity

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

A) True

B) False

18 / 20

Category: Basic Electricity

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

A) 25.48 V

B) 50.96 V

C) 14.14 V

D) 6.37 V

19 / 20

Category: Basic Electricity

19. The unit of frequency is the hertz

A) False

B) True

20 / 20

Category: Basic Electricity

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

A) 100%

B) 30%

C) 1%

D) Cannot be determined

Hints :

Frequency = 1/t = 1/15x10^-6 = 66666.67 Hz = 66.66 kHz

Pulse waveform = 20 kHz

Duty cycle = Pulse waveform/frequency = 20/66.66 = 0.3x100% = 30%

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

A) Either series or parallel

B) Series

C) Neither series nor parallel

D) Parallel

2 / 16

Category: Basic Electricity

2. Many resistors connected in series will?

A) Reduce the power to zero

B) Divide the current proportionally

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

D) Divide the voltage proportionally among all the resistor

3 / 16

Category: Basic Electricity

3. Ideal voltage source has-

A) Infinity internal resistance

B) High internal resistance

C) Low internal resistance

D) Zero internal resistance

4 / 16

Category: Basic Electricity

4. Ideal voltage source has-

A) Zero internal resistance

B) Infinity internal resistance

C) Low internal resistance

D) High internal resistance

5 / 16

Category: Basic Electricity

5. Batteries are generally connected in______

A) Series

B) Parallel

C) Neither series nor parallel

D) Either series or parallel

6 / 16

Category: Basic Electricity

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

A) It becomes double its original value

B) It becomes zero

C) It becomes infinity

D) It becomes half its original value

7 / 16

Category: Basic Electricity

7. 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 continues to glow with the same brightness

C) The other bulb also burns out

D) The other bulb glows with increased brightness

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) Neither voltage nor current

B) Current

C) Voltage

D) Both voltage and current

9 / 16

Category: Basic Electricity

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

A) The same for all resistors

B) Is zero for all resistors

C) Is divided equally among all resistors

D) Is divided proportionally across all resistors

10 / 16

Category: Basic Electricity

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

A) Either series or parallel

B) Parallel

C) Series

D) Neither series nor parallel

11 / 16

Category: Basic Electricity

11. Which is the most cost efficient connection?

A) Series

B) Neither series nor parallel

C) Either series or parallel

D) Parallel

12 / 16

Category: Basic Electricity

12. 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

13 / 16

Category: Basic Electricity

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

A) Infinite

B) The value of the source voltage

C) Null

D) Zero

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 glows with increased brightness

B) The other bulb blows out as well

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

D) The other bulb stops glowing

15 / 16

Category: Basic Electricity

15. Active circuit have -

A) either a or b

B) none of these

C) one current source

D) one voltage source

16 / 16

Category: Basic Electricity

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

A) Proportional to the value of the resistors

B) The amount of time the circuit

C) Proportional to the power in the circuit

D) Equal in all branches

Your score is

The average score is 40%

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/16

0 votes, 0 avg

Created on October 14, 2022 By

Electrical Notebook

2nd Semester

FEEE Unit-1.4 : Simple problems on source transformation

Fundamentals of Electrical & Electronics Engineering

Diploma in Engineering & Technology

2nd Semester - Common to all branch

1 / 16

Category: Basic Electricity

1. Calculate the equivalent resistance between A and B

A) 4 ohm

B) 8 ohm

C) 6 ohm

D) 2 ohm

Hints:

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

2 / 16

Category: Basic Electricity

2. Find the voltage across the 6 ohm resistor

A) 150 V

B) 54.48 V

C) 181.6 V

D) 27.27 V

3 / 16

Category: Basic Electricity

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

A) 27 ohm

B) 5 ohm

C) 12 ohm

D) 135 ohm

Hints:

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

4 / 16

Category: Basic Electricity

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

A) 7 ohm

B) 0.48 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.

5 / 16

Category: Basic Electricity

5. The voltage across the short is?

A) 135 V

B) Infinity

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. 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) Insufficient data provide

B) 12 A

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

7 / 16

Category: Basic Electricity

7. Calculate the equivalent resistance between A and B

A) 60 ohm

B) 15 ohm

C) 48 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.

8 / 16

Category: Basic Electricity

8. Find the current in the circuit.

A) 3 A

B) 1 A

C) 2 A

D) 4 A

9 / 16

Category: Basic Electricity

9. Calculate the total current in the circuit

A) 11.43 A

B) 20 A

C) 10 A

D) 15 A

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

10 / 16

Category: Basic Electricity

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

A) 25 ohm

B) 75 ohm

C) 15 ohm

D) 55 ohm

11 / 16

Category: Basic Electricity

11. Calculate the current across the 20 ohm resistor

A) 10 A

B) 6.67 A

C) 36.67 A

D) 20 A

12 / 16

Category: Basic Electricity

12. The voltage across the open circuit is?

A) 100 V

B) 90 V

C) 0 V

D) Infinity

13 / 16

Category: Basic Electricity

13. Calculate the resistance between A and B

A) 14.26 ohm

B) 7 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.

14 / 16

Category: Basic Electricity

14. Calculate the equivalent resistance between A and B

A) 6.67 ohm

B) 10.67 ohm

C) 26.67 ohm

D) 46.67 ohm

Hints:

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

15 / 16

Category: Basic Electricity

15. The total resistance between A and B are?

A) 80 ohm

B) 5 ohm

C) 20 ohm

D) 0 ohm

16 / 16

Category: Basic Electricity

16. Voltage across the 60 ohm resistor is______

A) 120 V

B) 72 V

C) 0 V

D) 48 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: Basic Electricity

1. In case of D.C –

A) Direction of current changes with time

B) Magnitude and direction both change with time

C) Magnitude and direction remains constant

D) Magnitude 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. KWh is the unit of -

A) Efficiency

B) Power

C) Energy

D) Work

4 / 13

Category: Basic Electricity

4. S.I unit of conductance is –

A) Ohm-m

B) Ohm

C) Mho

D) Mho-m

5 / 13

Category: Basic Electricity

5. S.I unit of Power is –

A) Watt

B) Watt-hr

C) Joule

D) Coulomb

6 / 13

Category: Basic Electricity

6. Instantaneous power in inductor is proportional to the –

A) Square of rate of change of current

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

C) Square of instantaneous current

D) Temperature of the inductor

7 / 13

Category: Basic Electricity

7. 1 coulomb charge equals the charge of –

A) 6.24×10^12 electrons

B) 6.24×10^16 electrons

C) 6.24×10^18 electrons

D) 6.24×10^-18 electrons

8 / 13

Category: Basic Electricity

8. Electric pressure is also called –

A) Resistance

B) Energy

C) Voltage

D) Conductance

9 / 13

Category: Basic Electricity

9. Insulating material can –

A) Protect a short circuit between two conductors

B) Conduct very large current

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

D) Store varying voltage

10 / 13

Category: Basic Electricity

10. 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) Total current in the circuit will increase

D) The other two lamps will glow

11 / 13

Category: Basic Electricity

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

A) positive charges

B) Atoms

C) electrons

D) electrons & ions

12 / 13

Category: Magnetic Circuit

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

A) Magnetomotive force

B) Electromotive difference

C) Electromotive force

D) voltage

13 / 13

Category: AC Fundamental

13. Average power taken by a pure capacitor is –

A) Zero

B) Unity

C) Minimum

D) Maximum

Your score is

The average score is 53%

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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) Low

B) high

C) zero

D) unity

2 / 20

Category: Magnetic Circuit

2. S.I unit of Reluctance-

A) AT/m

B) AT

C) N/Wb

D) AT/Wb

3 / 20

Category: Magnetic Circuit

3. Paramagnetic materials are –

A) strongly repelled by a magnet

B) slightly attracted by a magnet

C) Strongly attracted by a magnet

D) none

4 / 20

Category: Magnetic Circuit

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

A) Oersted

B) WB/m²

C) Both A & B

D) Tesla

5 / 20

Category: Magnetic Circuit

5. Magnetic circuit is a closed path followed by –

A) Flux density

B) M.M.F

C) None of these

D) flux

6 / 20

Category: Magnetic Circuit

6. In a electric circuit MMF is similar to

A) Resistance

B) Current

C) Flux

D) Electromotive force

7 / 20

Category: Magnetic Circuit

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

A) Voltage drop

B) Current

C) Emf

D) None

8 / 20

Category: Magnetic Circuit

8. The reciprocal of permeability is –

A) reluctivity

B) Conductivity

C) MMF

D) Resistivity

9 / 20

Category: Magnetic Circuit

9. Magnetic lines of forces –

A) never intersect

B) often intersect

C) are not predictable

D) intersect only in some special circumstances

10 / 20

Category: Magnetic Circuit

10. The unit of magnetic flux is –

A) Weber

B) Henry

C) Ampere turns

D) Tesla

11 / 20

Category: Magnetic Circuit

11. Which of the following is unit less?

A) Permeability

B) Permittivity

C) Magnetic susceptibility

D) Moment of Magnet

12 / 20

Category: Magnetic Circuit

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

A) Electric magnets

B) Electromagnetic fields

C) Electromagnets

D) Electromagnetism field

13 / 20

Category: Magnetic Circuit

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

A) molecular friction

B) rapid reversals of its magnetisation

C) its high retentivity

D) flux density lagging behind magnetising force

14 / 20

Category: Magnetic Circuit

14. Magnetic field is proportional to the –

A) all of these

B) direction of electric charges

C) Speed of electric charges

D) Quality of electric charges

15 / 20

Category: Magnetic Circuit

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

A) either b or c

B) Reluctance

C) Magnitude of current

D) number of turns in the circuit

16 / 20

Category: Magnetic Circuit

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

A) Insulator

B) both a and c

C) Solenoid

D) Multi turn coil

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. Hysteresis loss least depends on –

A) steinmetz coefficient of material

B) frequency

C) ambient temperature

D) volume of material

19 / 20

Category: Magnetic Circuit

19. Magnetic field has -

A) only magnitude

B) Only direction

C) none

D) both magnitude & direction

20 / 20

Category: AC Fundamental

20. Absolute permittivity of dielectric medium is represented as –

A) ε0 εr

B) ε0

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) Faraday

C) Orsted

D) Flemmings

2 / 4

Category: Magnetic Circuit

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

A) Aid the increasing current

B) Tend to decrease the amount of current

C) Produce current opposite to the increasing current

D) Aid the applied voltage

3 / 4

Category: Magnetic Circuit

3. 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

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) Coulomb

B) Lenz

C) Newton

D) Faraday

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: AC Fundamental

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

A) High impedance

B) High Inductance

C) High capacitance

D) Low impedance

2 / 6

Category: DC Machines

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

A) Transformer

B) Thermo-couple

C) Generator

D) Choke

3 / 6

Category: Basic Electricity

3. Electrolysis is possible with –

A) none

B) D.C supply only

C) A.C supply only

D) both A.C and D.C supply

4 / 6

Category: Magnetic Circuit

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

A) Coil resistance

B) Flux magnitude

C) Rate of change of flux

D) None

5 / 6

Category: Magnetic Circuit

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

A) Capacitance

B) Mutual inductance

C) None

D) Self-inductance

6 / 6

Category: AC Machines & Transformer

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

A) Motor

B) Transformer

C) Battery

D) Generator

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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. 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

2 / 12

Category: Magnetic Circuit

2. 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.

3 / 12

Category: Magnetic Circuit

3. 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) doubled

C) quadrupled

D) halved

4 / 12

Category: Magnetic Circuit

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

A) LI^2

B) IL^2

C) L^2 I / 2

D) LI^2 / 2

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) 0

B) I/2

C) I/4

D) I

6 / 12

Category: Magnetic Circuit

6. 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) L / 2It

C) LI / 2t

D) LI^2/ 2t

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

7 / 12

Category: Magnetic Circuit

7. 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

C) I/4

D) 0

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

8 / 12

Category: Magnetic Circuit

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

A) 2.5 V

B) 5 V

C) 3.5 V

D) 1.5 V

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

9 / 12

Category: Magnetic Circuit

9. 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) 90 J

C) 20 J

D) 15 J

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

10 / 12

Category: Magnetic Circuit

10. 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) initially increase and then decrease

C) decrease

D) Increase

11 / 12

Category: AC Fundamental

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

A) both a and b

B) electric field

C) Magnetic field

D) none

12 / 12

Category: AC Fundamental

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

A) Q^2 / 2C

B) All of the above

C) 1/2 CV^2

D) 1/2 QV

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The average score is 51%

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2nd Semester

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

Fundamentals of Electrical & Electronics Engineering

Diploma in Engineering & Technology

2nd Semester - Common to all branch

1 / 5

Category: DC Machines

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

A) Flemmings Right hand rule

B) Left hand thumb rule

C) Flemmings Left hand rule

D) Palm rule

2 / 5

Category: DC Machines

2. 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

3 / 5

Category: Magnetic Circuit

3. A magnetic field like this is called –

A) A parallel field

B) A uniform field

C) a paramagnetic field

D) a distorted field

4 / 5

Category: Magnetic Circuit

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

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

B) The piece of metal will lose it magnetism

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

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

5 / 5

Category: Magnetic Circuit

5. 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) Fleming's Right Hand Rule

D) Faraday's Left Hand Rule

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The average score is 43%

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Electrical Notebook

2nd Semester

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

Fundamentals of Electrical & Electronics Engineering

Diploma in Engineering & Technology

2nd Semester - Common to all branch

1 / 2

Category: Basic Electricity

1. If energy required to heat up a heater coil is 4 KWh and the energy loss is 20%, then what is the energy input?

A) 2 kWh

B) 4 kWh

C) 1 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 kWh

B) 5 kWh

C) 0.005 kWh

D) 0.05 Wh

Hints:

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

Your score is

The average score is 42%

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Unit- 3 : AC Circuits

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Electrical Notebook

2nd Semester

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

Fundamental of Electrical & Electronics Engineering

Diploma in Engineering & Technology

2nd Semester - Common to all branches

1 / 20

Category: AC Fundamental

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

A) 1

B) 0.707

C) 1.41

D) 1.11

2 / 20

Category: AC Fundamental

2. Form factor of square wave is-

A) 2

B) 1.41

C) 1

D) 1.47

3 / 20

Category: AC Fundamental

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

A) 360°

B) 0°

C) 180°

D) 90°

4 / 20

Category: AC Fundamental

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

A) 25 π

B) 100 π

C) 50 π

D) 5 π

Hints:

Angular frequency = 2πf rad/sec = 100π

5 / 20

Category: AC Fundamental

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

A) Magnitude only

B) Both magnitude and direction

C) None

D) Direction only

6 / 20

Category: AC Fundamental

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

A) RMS voltage

B) None

C) Peak voltage

D) Average voltage

7 / 20

Category: AC Fundamental

7. 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

8 / 20

Category: AC Fundamental

8. Form factor of half wave rectified ac is-

A) 1.11

B) 1.41

C) 1.57

D) 2

9 / 20

Category: AC Fundamental

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

A) I R.M.S.

B) I max Lm value

C) None

D) I average value

10 / 20

Category: AC Fundamental

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

A) Heating effect

B) Current

C) Voltage

D) Charge transfer

11 / 20

Category: AC Fundamental

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

A) 282.8 A

B) 70.7 A

C) 150 A

D) 141 A

Hints: Peak factor of sine wave = 1.41

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

12 / 20

Category: AC Fundamental

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

A) A sinusoid of double the frequency

B) A sinusoid of half the original frequency

C) A sinusoid of the same frequency

D) Not a sinusoid

13 / 20

Category: AC Fundamental

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

A) 0.707

B) 1.11

C) 0.637

D) 1.414

Hints:

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

14 / 20

Category: AC Fundamental

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

A) C only

B) R only

C) L only

D) All of these

15 / 20

Category: AC Fundamental

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

A) 50 Hz

B) 30 Hz

C) 5 Hz

D) 20 Hz

16 / 20

Category: AC Fundamental

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

A) Heating effect

B) Voltage

C) Current

D) Charge transfers

17 / 20

Category: AC Fundamental

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

A) Charge transfer

B) Heating effect

C) Current

D) Voltage

18 / 20

Category: AC Fundamental

18. The frequency of an alternating current is –

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

B) The number of cycles generated in one minute

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

D) The speed with which the alternator runs

19 / 20

Category: AC Fundamental

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

A) 1 Hz

B) π Hz

C) 2π Hz

D) None

Hints:

v= Vm sin 2πft volt

here f=1 Hz

20 / 20

Category: AC Fundamental

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

A) Permeance and Susceptance

B) Reluctance and Permeance

C) Resistance and Reactance

D) Conductance, Susceptance

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: AC Fundamental

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

A) 314 Hz

B) 50 Hz

C) 75 Hz

D) 100 Hz

2 / 4

Category: AC Fundamental

2. 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

3 / 4

Category: AC Fundamental

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

A) 0.05 sec

B) 0.04 sec

C) 0.06 sec

D) 0.01 sec

Hints:

2πf= 628

f=628/2π = 99.94 Hz

t= 1/f = 0.01 sec

4 / 4

Category: Basic Electricity

4. What is the RMS value of the current if the maximum value of sine wave current is 100 A?

A) 707.2 A

B) 100 A

C) 70.72 A

D) 7.07 A

Hints:

from peak factor,

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

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The average score is 43%

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Electrical Notebook

2nd Semester

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

Fundamentals of Electrical & Electronics Engineering

Diploma in Engineering & Technology

2nd Semester - Common to all branch

1 / 5

Category: AC Fundamental

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

A) Voltage across R and L are in phase

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

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

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

2 / 5

Category: AC Fundamental

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

A) Vr/V

B) R/Z

C) All of these

D) P/S

3 / 5

Category: AC Fundamental

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

A) 90° leads the current

B) 90° lags the current

C) lags the current

D) leads the current

4 / 5

Category: AC Fundamental

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

A) R-L-C all

B) L only

C) C only

D) R only

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.

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The average score is 31%

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Electrical Notebook

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 series R-C circuit, the applied voltage –

A) 90° lags the current

B) 90° leads the current

C) leads the current

D) lags the current

2 / 5

Category: AC Fundamental

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

A) 1.11

B) 1.414

C) 0.637

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.

3 / 5

Category: AC Fundamental

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

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

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

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

D) Voltage across R and L are in phase

In an inductive circuit current always lag behind the voltage.

4 / 5

Category: AC Fundamental

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

A) P/S

B) Vr /V

C) All of the above

D) R/Z

5 / 5

Category: AC Fundamental

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

A) R-L-C all

B) C only

C) L only

D) R only

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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: AC Fundamental

1. Capacitors for power factor correction are rated in -

A) KVAR

B) VA

C) KVA

D) KW

2 / 20

Category: AC Fundamental

2. Unit of impedance is

A) Mho

B) Henry

C) Farad

D) Ohm

3 / 20

Category: AC Fundamental

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

A) 0 and 1

B) 0 and -1

C) None of these

D) -1 and 1

4 / 20

Category: AC Fundamental

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

A) R/Z

B) Vr/V

C) All of the above

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

5 / 20

Category: AC Fundamental

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

A) capacitance is less & supply frequency is more

B) capacitance & supply frequency is more

C) Capacitance & supply frequency is less

D) Capacitance is more & supply frequency is less

Xc= 1/2πfC

6 / 20

Category: AC Fundamental

6. Reactive power is the product of

A) V, I, sin ø

B) V, I

C) V, I, tan ø

D) V, I, cos ø

7 / 20

Category: AC Fundamental

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

A) all of the above

B) Real power

C) Average power

D) True power

8 / 20

Category: AC Fundamental

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

A) Unity power factor

B) Maximum load current

C) High power factor

D) Low efficiency

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

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) both A and B

C) Capacitive reactance in ohms

D) Ohmic loss due to Ohmic resistance of plates

10 / 20

Category: AC Fundamental

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

A) 2 ohm

B) 14 ohm

C) 10 ohm

D) 2 ohm

Z= √ (6^2+8^2) = 10 Ohm

11 / 20

Category: AC Fundamental

11. The power factor of practical inductor is

A) Zero

B) Leading

C) Lagging

D) Unity

12 / 20

Category: AC Fundamental

12. The power factor of an ordinary electric bulb is

A) Unity

B) Slightly more than unity

C) Zero

D) Slightly less than unity

Ordinary bulb means incandescent lamp or GLS lamp. The lamp glows on the basis of heating effect of resistance. The tungsten wire is used in coiled coil form in the bulb. Which is slightly inductive in nature, so the power factor is near about unity not purely unity, i.e. 0.98 to 0.99

13 / 20

Category: AC Fundamental

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

A) Lagging

B) leading

C) unity

D) zero

14 / 20

Category: Basic Electricity

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

A) Reactive power

B) Apparent power

C) True power

D) none of the above

15 / 20

Category: Circuit Theory & Network

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

A) Lagging

B) Zero

C) Leading

D) Unity

16 / 20

Category: Circuit Theory & Network

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

A) True component of current

B) none

C) Watt-less component of current

D) Active component of current

17 / 20

Category: Circuit Theory & Network

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

A) Zero

B) Lagging

C) Leading

D) Unity

18 / 20

Category: Circuit Theory & Network

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

A) None

B) Resonant frequency

C) Q

D) Bandwidth

Resonent frequency = 1/2π √(L/C)

19 / 20

Category: Circuit Theory & Network

19. 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

20 / 20

Category: Circuit Theory & Network

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

A) 0.81

B) 0.111

C) 1

D) 1.111

Q factor is the reciprocal of the power factor

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2nd Semester

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

Fundamentals of Electrical & Electronics Engineering

Diploma in Engineering & Technology

2nd Semester - Common to all branch

1 / 2

Category: Basic Electricity

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

A) 18 ohm

B) 9 ohm

C) 2 ohm

D) 6 ohm

2 / 2

Category: AC Machines & Transformer

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

A) 57.7%

B) 100%

C) 66.7%

D) 75%

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The average score is 38%

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Unit- 4 : Transformers and Machines

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Electrical Notebook

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

Diploma in Engineering & Technology

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

Diploma in Engineering & Technology

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2nd Semester

FEEE Unit-4.6 : Types of motors and applications

Fundamentals of Electrical & Electronics Engineering

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2nd Semester

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

Fundamentals of Electrical & Electronics Engineering

Diploma in Engineering & Technology

2nd Semester - Common to all branch

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Electrical Circuits Quiz

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

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