Basic Electrical Engineering (3110005) MCQs

MCQs of DC Circuits

Showing 21 to 30 out of 137 Questions
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21.
Which of the following is not an expression of power?
(a) P = VI
(b) P = I2R
(c) P = V2/R
(d) P = I/R
Answer:

Option (d)

22.
A 250V bulb passes a current of 0.3A. Calculate the power in the lamp.
(a) 75 W
(b) 50 W
(c) 25 W
(d) 90 W
Answer:

Option (a)

23.
Kilowatt-hour(kWh) is a unit of?
(a) Current
(b) Power
(c) Energy
(d) Resistance
Answer:

Option (c)

24.
The SI unit of power is?
(a) kW (kilo-watt)
(b) J/s (joules per second)
(c) Ws (watt-second)
(d) J/h (joules per hour)
Answer:

Option (b)

25.
Out of the following, which one is not a source of electrical energy?
(a) Solar cell
(b) Battery
(c) Potentiometer
(d) Generator
Answer:

Option (c)

26.
Which among the following is an expression for energy?
(a) V2It
(b) V2Rt
(c) V2t/R
(d) V2t2/R
Answer:

Option (c)

27.
A battery converts___________
(a) Electrical energy to chemical energy
(b) Chemical energy to electrical energy
(c) Mechanical energy to electrical energy
(d) Chemical energy to mechanical energy
Answer:

Option (b)

28.
Materials which easily allow the passage of electric current are known as ______
(a) Insulators
(b) Conductors
(c) Dielectrics
(d) Semi-conductors
Answer:

Option (b)

29.
Which of the following statements are true with regard to resistance?
(a) Resistance is directly proportional to a length of the wire
(b) Resistance is directly proportional to an area of cross section 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
Answer:

Option (a)

30.
Which, among the following is a unit for resistivity?
(a) ohm/metre
(b) ohm/metre2
(c) ohm-metre
(d) ohm-metre2
Answer:

Option (c)

Showing 21 to 30 out of 137 Questions
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