Basic electrical Multiple choice questions and answers

01․ If 1 A current flows in a circuit, the number of electrons flowing through this circuit is

0.625 × 10^19

1.6 × 10^19

1.6 × 10^ - 19

0.625 × 10^ - 19


02․ The resistivity of the conductor depends on

area of the conductor.

length of the conductor.

type of material.

none of these.


03. Four capacitors each of 40 µF are connected in parallel, the equivalent capacitance of the system will be

160 µF

10 µF

40 µF

5 µF


04. Five capacitors each of 5 µF are connected in series, the equivalent capacitance of the system will be

5 µF

25 µF

10 µF

1 µF


05. The unit of resistivity is

Ω.

Ω - metre.

Ω / metre.

Ω / m².


06. Absolute permittivity of dielectric medium is represented as

ε0

εr

εr/ε0

εrε0


07. Magnetic flux has the unit of

Newton

Ampere turn

Weber

Tesla


08. If P is the power of a star connected system then what will be power of an equivalent delta connected system?

P

3P

P/3

None of the above


09. Which of the following are the passive elements?

Resistor

Bulb

Both

None of thes


10. Power dissipation in ideal inductor is

Maximum

Minimum

Zero

A finite value


11. Which of the followings is/are active element?

Voltage source

Current source

Both

None of these.


12. Inductor does not allow the sudden change of

current

voltage

power

None of the above


13. Capacitor does not allow the sudden change of

current

voltage

power

None of the above


14. Internal resistance of ideal voltage source is

zero

infinite

finite

100 ohm


15. Super position theorem is not applicable for

current calculations.

voltage calculations.

power calculations.

None of the above.


16. Which quantity should be measured by the voltmeter ?

Current

Voltage

Power

Speed


17. Which quantity consists of a unit 1KWh ?

Energy

Time

Power

Charge


18. Which of the following has no units?

1 point

Permeability

Moment of a magnet

Magnetic susceptibility

Permittivity


19. Which of the following quantities consists of SI unit as WATT ?

Force

Charge

Current

Power

20. KCL works on the principle of which of the following

1 point

law of conservation of charge.

law of conservation of energy.

both.

None of the above.

21. KVL works on the principle of

1 point

law of conservation of charge.

law of conservation of energy.

both.

None of the above.

22. Which of the following defined the average value ?

Voltage

Heating effect

Current

Charge transfer


23. Rms value is defined based on which of the following?

Heating effect

Charge transfer

Current

Voltage


24. Form factor is equal to Peak factor in case of

square wave.

triangle wave.

saw tooth wave.

all of the above

Read more» Basic electrical mcqs

25. Average power taken by the pure capacitor is

Zero

Minimum

Maximum

Any of the above


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