MCQ Quiz on Fundamental of Electrical & Electronics Engineering

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Unit- 1 : Electric and Magnetic Circuits

/20

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325

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. 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) 5:7

B) 2:7

C) 2:5

D) 7:5

2 / 20

Category: Basic Electricity

2. What is the resistivity of Copper?

A) 7.3×10^-8 ohm-m

B) 5.35×10^-8 ohm-m

C) 2.7×10^-8 ohm-m

D) 1.59×10^-8 ohm-m

3 / 20

Category: Basic Electricity

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

A) 32 times

B) 16 times

C) 4 times

D) 8 times

4 / 20

Category: Basic Electricity

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

A) no bulb will glow

B) The other two lamps will glow

C) all the three will glow

D) Total current in the circuit will increase

5 / 20

Category: Basic Electricity

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

A) A resistor

B) A normal capacitor as in AC

C) Open circuit

D) A short circuit

6 / 20

Category: Basic Electricity

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

A) ohm/meter

B) ohm-meter^2

C) ohm-meter

D) ohm/meter^2

7 / 20

Category: Basic Electricity

7. 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

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) 16 kiloohm-meter

B) 8 kilo ohm-meter

C) 8 ohm-meter

D) 16 ohm-meter

Hints:

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

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

9 / 20

Category: Basic Electricity

9. Frequency of Direct Current is

A) 50 Hz

B) 40 Hz

C) 50 kHz

D) 0 Hz

10 / 20

Category: Basic Electricity

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

A) Conductors

B) Dielectrics

C) Semi-conductors

D) Insulators

11 / 20

Category: Basic Electricity

11. The resistance of straight conductor is independent of-

A) Material

B) Cross-sectional area

C) Temperature

D) Shape of cross-section

12 / 20

Category: Basic Electricity

12. The Inductor doesn’t allow sudden changes in

A) Inductance

B) Current

C) Resistance

D) Voltage

13 / 20

Category: Basic Electricity

13. The reciprocal of resistivity is________

A) Resistance

B) Conductance

C) Conductivity

D) Impedance

14 / 20

Category: Basic Electricity

14. 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) No bulb will glow

C) The other two lamps will glow

D) All the three will glow

15 / 20

Category: Basic Electricity

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

A) Coulomb, Faraday

B) Henry, Faraday

C) Henry, Coulomb

D) Faraday, Henry

16 / 20

Category: Basic Electricity

16. 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) Both have equal resistance

B) The 10 sqm wire has higher resistance

C) The 15 sqm wire has higher resistance

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

17 / 20

Category: Basic Electricity

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

A) 50625 W

B) 5062.5 W

C) 506.25 W

D) 50.625 W

Apply E= ½ cv².

18 / 20

Category: Basic Electricity

18. The expression for energy of an inductor

A) ½ LI^2

B) L/2I

C) ½ L^2.I

D) ½ LI

19 / 20

Category: Basic Electricity

19. 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 directly proportional to a length of the wire

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

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

20 / 20

Category: Basic Electricity

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

A) Qv

B) Q/v

C) Q-v

D) Q + v

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. The unit of frequency is the hertz

A) True

B) False

3 / 20

Category: Basic Electricity

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

A) True

B) False

4 / 20

Category: Basic Electricity

4. A phasor represents

A) The width of a quantity

B) The phase angle

C) The magnitude of a quantity

D) The magnitude and a quantity direction

5 / 20

Category: Basic Electricity

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

A) True

B) False

6 / 20

Category: Basic Electricity

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

A) 25%

B) 50%

C) 100%

D) 1%

7 / 20

Category: Basic Electricity

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

A) False

B) True

8 / 20

Category: Basic Electricity

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

A) 6°

B) 60°

C) 27°

D) 180°

9 / 20

Category: Basic Electricity

9. 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) 2.66 V

C) 18.8 V

D) 4 V

10 / 20

Category: Basic Electricity

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

A) 6.5 V

B) 13 V

C) None of the above

D) 26 V

11 / 20

Category: Basic Electricity

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

A) 250 Hz

B) 2,500 Hz

C) 25,000 Hz

D) 400 Hz

12 / 20

Category: Basic Electricity

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

A) True

B) False

13 / 20

Category: Basic Electricity

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

A) 4 μs

B) 2 μs

C) 100 μs

D) 20 μs

14 / 20

Category: Basic Electricity

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

A) 100 Hz

B) 10 Hz

C) 1,000 Hz

D) 50 Hz

Hints:

Frequency = 1/time period

15 / 20

Category: Basic Electricity

15. The duty cycle of a pulse waveform with a pulse width of 10 µs and a period of 100 µs is 25%.

A) True

B) False

16 / 20

Category: Basic Electricity

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

A) 12 cycles

B) 1,200 cycles

C) 120 cycles

D) 1/100 cycle

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) 1 mA

B) 1.5 mA

C) 10 mA

D) 15 mA

18 / 20

Category: Basic Electricity

18. 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) None of the above

C) 40°

D) 0°

19 / 20

Category: Basic Electricity

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

A) False

B) True

20 / 20

Category: Basic Electricity

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

A) 25.48 V

B) 50.96 V

C) 6.37 V

D) 14.14 V

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) Parallel

D) Neither series nor parallel

2 / 16

Category: Basic Electricity

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

A) Series

B) Neither series nor parallel

C) Parallel

D) Either series or parallel

3 / 16

Category: Basic Electricity

3. The energy per unit charge is

A) Work

B) Power

C) Voltage

D) Current

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

4 / 16

Category: Basic Electricity

4. Ideal voltage source has-

A) Zero internal resistance

B) High internal resistance

C) Low internal resistance

D) Infinity internal resistance

5 / 16

Category: Basic Electricity

5. Ideal voltage source has-

A) Zero internal resistance

B) Low internal resistance

C) High internal resistance

D) Infinity internal resistance

6 / 16

Category: Basic Electricity

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

A) The other bulb stops glowing

B) The other bulb glows with increased brightness

C) The other bulb blows out as well

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

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 glows with increased brightness

B) The other bulb also burns out

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

D) The other bulb stops glowing

8 / 16

Category: Basic Electricity

8. Many resistors connected in series will?

A) Reduce the power to zero

B) Divide the current proportionally

C) Divide the voltage proportionally among all the resistor

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

9 / 16

Category: Basic Electricity

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

A) Is zero for all resistors

B) Is divided equally among all resistors

C) Is divided proportionally across all resistors

D) The same for all resistors

10 / 16

Category: Basic Electricity

10. 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) Voltage

C) Neither voltage nor current

D) Current

11 / 16

Category: Basic Electricity

11. Active circuit have -

A) one current source

B) one voltage source

C) none of these

D) either a or b

12 / 16

Category: Basic Electricity

12. Which is the most cost efficient connection?

A) Either series or parallel

B) Parallel

C) Neither series nor parallel

D) Series

13 / 16

Category: Basic Electricity

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

A) Null

B) Infinite

C) Zero

D) The value of the source voltage

14 / 16

Category: Basic Electricity

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

A) It becomes half its original value

B) It becomes double its original value

C) It becomes infinity

D) It becomes zero

15 / 16

Category: Basic Electricity

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

A) Equal in all branches

B) Proportional to the value of the resistors

C) Proportional to the power in the circuit

D) The amount of time the circuit

16 / 16

Category: Basic Electricity

16. Batteries are generally connected in______

A) Series

B) Neither series nor parallel

C) Parallel

D) Either series or parallel

Your score is

The average score is 40%

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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 resistance between A and B

A) 14.26 ohm

B) 29.69 ohm

C) 3.56 ohm

D) 7 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.

2 / 16

Category: Basic Electricity

2. The total resistance between A and B are?

A) 5 ohm

B) 80 ohm

C) 20 ohm

D) 0 ohm

3 / 16

Category: Basic Electricity

3. Find the current in the circuit.

A) 3 A

B) 4 A

C) 2 A

D) 1 A

4 / 16

Category: Basic Electricity

4. Calculate the equivalent resistance between A and B

A) 46.67 ohm

B) 6.67 ohm

C) 26.67 ohm

D) 10.67 ohm

Hints:

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

5 / 16

Category: Basic Electricity

5. 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

6 / 16

Category: Basic Electricity

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

A) 15 ohm

B) 75 ohm

C) 55 ohm

D) 25 ohm

7 / 16

Category: Basic Electricity

7. Calculate the current across the 20 ohm resistor

A) 36.67 A

B) 20 A

C) 6.67 A

D) 10 A

8 / 16

Category: Basic Electricity

8. The voltage across the short is?

A) 11.25 V

B) Infinity

C) 135 V

D) Zero

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.

9 / 16

Category: Basic Electricity

9. Calculate the equivalent resistance between A and B

A) 2 ohm

B) 6 ohm

C) 8 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.

10 / 16

Category: Basic Electricity

10. The voltage across the open circuit is?

A) 0 V

B) 90 V

C) Infinity

D) 100 V

11 / 16

Category: Basic Electricity

11. Find the voltage across the 6 ohm resistor

A) 181.6 V

B) 27.27 V

C) 54.48 V

D) 150 V

12 / 16

Category: Basic Electricity

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

A) 5 ohm

B) 135 ohm

C) 12 ohm

D) 27 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) 60 ohm

B) 12 ohm

C) 48 ohm

D) 15 ohm

Hints:

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

14 / 16

Category: Basic Electricity

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

A) 0 ohm

B) 7 ohm

C) 7.67 ohm

D) 0.48 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.

15 / 16

Category: Basic Electricity

15. 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.

16 / 16

Category: Basic Electricity

16. Voltage across the 60 ohm resistor is______

A) 120 V

B) 48 V

C) 0 V

D) 72 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: Magnetic Circuit

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

A) Electromotive difference

B) voltage

C) Electromotive force

D) Magnetomotive force

2 / 13

Category: AC Fundamental

2. Average power taken by a pure capacitor is –

A) Maximum

B) Unity

C) Zero

D) Minimum

3 / 13

Category: Basic Electricity

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

A) electrons & ions

B) electrons

C) positive charges

D) Atoms

4 / 13

Category: Basic Electricity

4. Insulating material can –

A) Protect a short circuit between two conductors

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

C) Store varying voltage

D) Conduct very large current

5 / 13

Category: Basic Electricity

5. KWh is the unit of -

A) Power

B) Efficiency

C) Energy

D) Work

6 / 13

Category: Basic Electricity

6. 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

7 / 13

Category: Basic Electricity

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

A) all the three will glow

B) Total current in the circuit will increase

C) no bulb will glow

D) The other two lamps will glow

8 / 13

Category: Basic Electricity

8. Instantaneous power in inductor is proportional to the –

A) Temperature of the inductor

B) Square of instantaneous current

C) Square of rate of change of current

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

9 / 13

Category: Basic Electricity

9. S.I unit of Power is –

A) Watt

B) Joule

C) Coulomb

D) Watt-hr

10 / 13

Category: Basic Electricity

10. 1 coulomb charge equals the charge of –

A) 6.24×10^18 electrons

B) 6.24×10^-18 electrons

C) 6.24×10^12 electrons

D) 6.24×10^16 electrons

11 / 13

Category: Basic Electricity

11. Electric pressure is also called –

A) Voltage

B) Energy

C) Resistance

D) Conductance

12 / 13

Category: Basic Electricity

12. S.I unit of conductance is –

A) Mho

B) Mho-m

C) Ohm-m

D) Ohm

13 / 13

Category: Basic Electricity

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

A) Voltmeter

B) Ammeter

C) Ohmmeter

D) Multimeter

Your score is

The average score is 52%

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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. Which of the following is unit less?

A) Moment of Magnet

B) Magnetic susceptibility

C) Permeability

D) Permittivity

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) Reluctance

D) number of turns in the circuit

3 / 20

Category: Magnetic Circuit

3. The reciprocal of permeability is –

A) reluctivity

B) Conductivity

C) Resistivity

D) MMF

4 / 20

Category: Magnetic Circuit

4. S.I unit of Reluctance-

A) AT/m

B) N/Wb

C) AT/Wb

D) AT

5 / 20

Category: Magnetic Circuit

5. Magnetic field is proportional to the –

A) Quality of electric charges

B) Speed of electric charges

C) all of these

D) direction of electric charges

6 / 20

Category: Magnetic Circuit

6. In a electric circuit MMF is similar to

A) Flux

B) Electromotive force

C) Resistance

D) Current

7 / 20

Category: Magnetic Circuit

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

A) Current

B) Voltage drop

C) Emf

D) None

8 / 20

Category: Magnetic Circuit

8. Hysteresis loss least depends on –

A) steinmetz coefficient of material

B) ambient temperature

C) volume of material

D) frequency

9 / 20

Category: Magnetic Circuit

9. Magnetic field strength is

A) N.ø/I

B) None of these

C) N.i

D) N.i / L

10 / 20

Category: Magnetic Circuit

10. Magnetic circuit is a closed path followed by –

A) flux

B) M.M.F

C) None of these

D) Flux density

11 / 20

Category: Magnetic Circuit

11. 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) molecular friction

D) its high retentivity

12 / 20

Category: Magnetic Circuit

12. Magnetic field has -

A) none

B) both magnitude & direction

C) only magnitude

D) Only direction

13 / 20

Category: Magnetic Circuit

13. Paramagnetic materials are –

A) none

B) slightly attracted by a magnet

C) Strongly attracted by a magnet

D) strongly repelled by a magnet

14 / 20

Category: Magnetic Circuit

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

A) Electromagnets

B) Electromagnetic fields

C) Electric magnets

D) Electromagnetism field

15 / 20

Category: Magnetic Circuit

15. The unit of magnetic flux is –

A) Henry

B) Tesla

C) Ampere turns

D) Weber

16 / 20

Category: Magnetic Circuit

16. Magnetic lines of forces –

A) never intersect

B) are not predictable

C) intersect only in some special circumstances

D) often intersect

17 / 20

Category: Magnetic Circuit

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

A) Both A & B

B) Tesla

C) Oersted

D) WB/m²

18 / 20

Category: Magnetic Circuit

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

A) Solenoid

B) Insulator

C) both a and c

D) Multi turn coil

19 / 20

Category: AC Fundamental

19. Absolute permittivity of dielectric medium is represented as –

A) ε0 εr

B) εr

C) ε0

D) εr /ε0

20 / 20

Category: Basic Electricity

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

A) high

B) zero

C) Low

D) unity

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) Flemmings

B) Orsted

C) Edison

D) Faraday

2 / 4

Category: Magnetic Circuit

2. An open coil has –

A) Zero resistance and inductance

B) Infinite resistance and zero inductance

C) Infinite resistance and normal inductance

D) Zero resistance and high inductance

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 increasing current

C) Aid the applied voltage

D) Produce current opposite to the increasing 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) Coulomb

D) Lenz

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: AC Machines & Transformer

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

A) Battery

B) Transformer

C) Motor

D) Generator

2 / 6

Category: Basic Electricity

2. Electrolysis is possible with –

A) A.C supply only

B) none

C) both A.C and D.C supply

D) D.C supply only

3 / 6

Category: DC Machines

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

A) Choke

B) Generator

C) Thermo-couple

D) Transformer

4 / 6

Category: AC Fundamental

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

A) High capacitance

B) High impedance

C) High Inductance

D) Low impedance

5 / 6

Category: Magnetic Circuit

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

A) Rate of change of flux

B) Flux magnitude

C) Coil resistance

D) None

6 / 6

Category: Magnetic Circuit

6. 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) Self-inductance

C) Capacitance

D) None

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The average score is 50%

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/12

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Electrical Notebook

2nd Semester

FEEE Unit-2.5 : Energy stored in magnetic circuit

Fundamentals of Electrical & Electronics Engineering

Diploma in Engineering & Technology

2nd Semester - Common to all branch

1 / 12

Category: Magnetic Circuit

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

A) 15 J

B) 20 J

C) 60 J

D) 90 J

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

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) 190 J

B) 150 J

C) 160 J

D) 220 J

Hints:

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

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) 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.

5 / 12

Category: Magnetic Circuit

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

A) 1.5 V

B) 2.5 V

C) 5 V

D) 3.5 V

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

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) I/2

B) 0

C) I/4

D) I

7 / 12

Category: Magnetic Circuit

7. Higher the self-inductance of a coil –

A) Greater the flux produced by it

B) Lesser its Weber-turns

C) longer the delay in establishing steady current through it

D) lower the E.M.F. induced

8 / 12

Category: Magnetic Circuit

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

A) LI^2

B) LI^2 / 2

C) L^2 I / 2

D) IL^2

9 / 12

Category: Magnetic Circuit

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

A) L / 2It

B) L / 2I^2 t

C) LI^2/ 2t

D) LI / 2t

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

10 / 12

Category: Magnetic Circuit

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

A) halved

B) quadrupled

C) doubled

D) Unaffected

11 / 12

Category: AC Fundamental

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

A) Magnetic field

B) both a and b

C) electric field

D) none

12 / 12

Category: AC Fundamental

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

A) 1/2 CV^2

B) Q^2 / 2C

C) 1/2 QV

D) All of the above

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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: Magnetic Circuit

1. A magnetic field like this is called –

A) a distorted field

B) a paramagnetic field

C) A uniform field

D) A parallel field

2 / 5

Category: Magnetic Circuit

2. 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

3 / 5

Category: Magnetic Circuit

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

A) Fleming's Right Hand Rule

B) Faraday's Left Hand Rule

C) Faraday's Right Hand Rule

D) Fleming's Left Hand Rule

4 / 5

Category: DC Machines

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

A) Left hand thumb rule

B) Palm rule

C) Flemmings Left hand rule

D) Flemmings Right hand rule

5 / 5

Category: DC Machines

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

A) Flemmings Left hand rule

B) Left hand thumb rule

C) Flemmings Right hand rule

D) Pulm 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. A bulb consumes 100 W when supply voltage is 200 V. Then find the energy consumed in 30 minutes.

A) 0.05 Wh

B) 0.005 kWh

C) 5 kWh

D) 0.05 kWh

Hints:

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

2 / 2

Category: Basic Electricity

2. 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) 5 kWh

C) 1 kWh

D) 4 kWh

Hints:

Input= 4 kWh+20% = 5 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. The peak value of a sine wave is 200 V. Its average value is –

A) 282.8 V

B) 200 V

C) 141.4 V

D) 127.4 V

Hints:

Peak factor = Max value/rms value = 1.41

rms value = 200/1.41 = 141.8 V

Form factor = rms value / avarage value = 1.11

Avarage value = 141.84/1.11 = 127.7 V

2 / 20

Category: AC Fundamental

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

A) I average value

B) None

C) I R.M.S.

D) I max Lm value

3 / 20

Category: AC Fundamental

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

A) Magnitude only

B) Both magnitude and direction

C) Direction only

D) None

4 / 20

Category: AC Fundamental

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

A) A sinusoid of the same frequency

B) A sinusoid of half the original frequency

C) Not a sinusoid

D) A sinusoid of double the frequency

5 / 20

Category: AC Fundamental

5. Form factor of half wave rectified ac is-

A) 1.41

B) 1.57

C) 2

D) 1.11

6 / 20

Category: AC Fundamental

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

A) 141 A

B) 70.7 A

C) 150 A

D) 282.8 A

Hints: Peak factor of sine wave = 1.41

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

7 / 20

Category: AC Fundamental

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

A) 20 Hz

B) 30 Hz

C) 50 Hz

D) 5 Hz

8 / 20

Category: AC Fundamental

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

A) All of these

B) C only

C) R only

D) L only

9 / 20

Category: AC Fundamental

9. Capacitive Susceptance is a measure of –

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

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

C) Reactive power in a circuit

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

10 / 20

Category: AC Fundamental

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

A) 2π Hz

B) None

C) 1 Hz

D) π Hz

Hints:

v= Vm sin 2πft volt

here f=1 Hz

11 / 20

Category: AC Fundamental

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

A) 100 π

B) 5 π

C) 25 π

D) 50 π

Hints:

Angular frequency = 2πf rad/sec = 100π

12 / 20

Category: AC Fundamental

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

A) 0°

B) 180°

C) 90°

D) 360°

13 / 20

Category: AC Fundamental

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

A) None

B) Peak voltage

C) RMS voltage

D) Average voltage

14 / 20

Category: AC Fundamental

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

A) Voltage

B) Current

C) Charge transfer

D) Heating effect

15 / 20

Category: AC Fundamental

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

A) Charge transfer

B) Current

C) Heating effect

D) Voltage

16 / 20

Category: AC Fundamental

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

A) Charge transfers

B) Heating effect

C) Current

D) Voltage

17 / 20

Category: AC Fundamental

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

A) 0.707

B) 1.41

C) 1.11

D) 1

18 / 20

Category: AC Fundamental

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

A) Reluctance and Permeance

B) Resistance and Reactance

C) Permeance and Susceptance

D) Conductance, Susceptance

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 of current is less than average value

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

C) None

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

20 / 20

Category: AC Fundamental

20. The frequency of an alternating current is –

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

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

C) The number of cycles generated in one minute

D) The speed with which the alternator runs

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The average score is 35%

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Electrical Notebook

2nd Semester

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

Fundamentals of Electrical & Electronics Engineering

Diploma in Engineering & Technology

2nd Semester - Common to all branch

1 / 4

Category: Basic Electricity

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

A) 7.07 A

B) 707.2 A

C) 100 A

D) 70.72 A

Hints:

from peak factor,

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

2 / 4

Category: AC Fundamental

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

A) 0.06 sec

B) 0.05 sec

C) 0.04 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) 314 Hz

B) 100 Hz

C) 75 Hz

D) 50 Hz

4 / 4

Category: AC Fundamental

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

A) 25 Hz

B) 50 Hz

C) 60 Hz

D) None

Hints:

2πf = 314

f= 314/2π = 49.97 Hz = 50 Hz

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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 a series R-C circuit, the applied voltage –

A) lags the current

B) 90° lags the current

C) 90° leads the current

D) leads the current

2 / 5

Category: AC Fundamental

2. 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) Voltage across R and L 180o out of face

C) Voltage across R and L are in phase

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

3 / 5

Category: AC Fundamental

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

A) R-L-C all

B) R only

C) C only

D) L only

4 / 5

Category: AC Fundamental

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

A) Vr/V

B) P/S

C) All of these

D) R/Z

5 / 5

Category: Basic Electricity

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

A) 0.637

B) 0.707

C) 1.414

D) 1.11

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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2nd Semester

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

Fundamentals of Electrical & Electronics Engineering

Diploma in Engineering & Technology

2nd Semester - Common to all branch

1 / 5

Category: AC Fundamental

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

A) C only

B) R only

C) L only

D) R-L-C all

2 / 5

Category: AC Fundamental

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

A) R/Z

B) P/S

C) All of the above

D) Vr /V

3 / 5

Category: AC Fundamental

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

A) 90° lags the current

B) leads the current

C) 90° leads the current

D) lags the current

4 / 5

Category: AC Fundamental

4. 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) Voltage across R and L are in phase

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

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

In an inductive circuit current always lag behind the voltage.

5 / 5

Category: AC Fundamental

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

A) 0.637

B) 0.707

C) 1.11

D) 1.414

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

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The average score is 49%

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Electrical Notebook

2nd Semester

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

Fundamentals of Electrical & Electronics Engineering

Diploma in Engineering & Technology

2nd Semester - Common to all branch

1 / 20

Category: AC Fundamental

1. 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

2 / 20

Category: AC Fundamental

2. Reactive power is the product of

A) V, I

B) V, I, cos ø

C) V, I, tan ø

D) V, I, sin ø

3 / 20

Category: AC Fundamental

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

A) Vr/V

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

C) All of the above

D) R/Z

4 / 20

Category: AC Fundamental

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

A) Loss of energy in dielectric

B) Ohmic loss due to Ohmic resistance of plates

C) Capacitive reactance in ohms

D) both A and B

5 / 20

Category: AC Fundamental

5. The power factor of an ordinary electric bulb is

A) Slightly less than unity

B) Slightly more than unity

C) Zero

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

6 / 20

Category: AC Fundamental

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

A) Real power

B) True power

C) Average power

D) all of the above

7 / 20

Category: AC Fundamental

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

A) 10 ohm

B) 14 ohm

C) 2 ohm

D) 2 ohm

Z= √ (6^2+8^2) = 10 Ohm

8 / 20

Category: AC Fundamental

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

A) Lagging

B) zero

C) leading

D) unity

9 / 20

Category: AC Fundamental

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

A) Maximum load current

B) Unity power factor

C) High power factor

D) Low efficiency

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

10 / 20

Category: AC Fundamental

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

A) Capacitance & supply frequency is less

B) capacitance & supply frequency is more

C) capacitance is less & supply frequency is more

D) Capacitance is more & supply frequency is less

Xc= 1/2πfC

11 / 20

Category: AC Fundamental

11. The power factor of practical inductor is

A) Leading

B) Lagging

C) Zero

D) Unity

12 / 20

Category: AC Fundamental

12. Unit of impedance is

A) Ohm

B) Mho

C) Farad

D) Henry

13 / 20

Category: Circuit Theory & Network

13. In any AC circuit always –

A) Actual power is more than reactive power

B) Apparent power is more than actual power

C) Reactive power is more than actual power

D) Reactive power is more than apparent power

14 / 20

Category: Circuit Theory & Network

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

A) none

B) True component of current

C) Watt-less component of current

D) Active component of current

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) Zero

B) Lagging

C) Leading

D) Unity

16 / 20

Category: Circuit Theory & Network

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

A) 0.111

B) 1.111

C) 1

D) 0.81

Q factor is the reciprocal of the power factor

17 / 20

Category: Circuit Theory & Network

17. A parallel AC circuit in resonance will –

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

B) Have a high impedance

C) Act like a resister of low value

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

18 / 20

Category: Circuit Theory & Network

18. 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) Leading

C) Unity

D) Lagging

19 / 20

Category: Circuit Theory & Network

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

A) Resonant frequency

B) Q

C) None

D) Bandwidth

Resonent frequency = 1/2π √(L/C)

20 / 20

Category: Circuit Theory & Network

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

A) Minimum

B) a very small amount

C) Maximum

D) Zero

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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: AC Machines & Transformer

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

A) 100%

B) 57.7%

C) 75%

D) 66.7%

2 / 2

Category: Basic Electricity

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

A) 9 ohm

B) 18 ohm

C) 2 ohm

D) 6 ohm

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The average score is 38%

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Unit- 4 : Transformers and Machines

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2nd Semester

FEEE Unit- 4.1 : Transformer and Machines

Fundamentals of Electrical & Electronics Engineering

Diploma in Engineering & Technology

2nd Semester - Common for all branches

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2nd Semester

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

Fundamentals of Electrical & Electronics Engineering

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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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2nd Semester

FEEE Unit-4.5 : Construction and working principle of motors

Fundamentals of Electrical & Electronics Engineering

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FEEE Unit-4.6 : Types of motors and applications

Fundamentals of Electrical & Electronics Engineering

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

Fundamentals of Electrical & Electronics Engineering

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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