Current Electricity objective questions in Electrical Engineering

Current Electricity objective questions in Electrical Engineering

The substances which have a large number of free

electrons and offer a low resistance are called

(a) insulators

(b) inductors

(c) semi-conductors

(d) conductors

Ans: d

Out of the following which is not a poor conductor ?

(a) Cast iron

(b) Copper

(c) Carbon

(d) Tungsten

Ans: b

Out of the following which is an insulating material ?

(a) Copper

(b) Gold

(c) Silver

(d) Paper

Ans: d

Conductance is reciprocal of

(a) resistance

(b) inductance

(c) reluctance

(d) capacitance

Ans: a

With rise in temperature the resistance of pure metals

(a) increases

(b) decreases

(c) first increases and then decreases

(d) remains constant

Ans: a

With rise in temperature the resistance of semiconductors

(a) decreases

(b) increases

(c) first increases and then decreases

(d) remains constant

Ans: a

The resistance of a copper wire 200 m long is 21 Q. If its

thickness (diameter) is 0.44 mm, its specific resistance is

around

(a) 1.2 x 10~8 Q-m

(b) 1.4 x 10~8 Q-m

(c) 1.6 x 10″”8 Q-m

(d) 1.8 x 10″8 Q-m

Ans: c

An instrument which detects electric current is known

as

(a) voltmeter

(b) rheostat

(c) wattmeter

(d) galvanometer

Ans: d

A light bulb draws 300 mA when the voltage across it is

240 V. The resistance of the light bulb is

(a) 400 Q

(b) 600 Q

(c) 800 Q

(d) 1000 Q

Ans: c

In a circuit a 33 Q resistor carries a current of 2 A. The

voltage across the resistor is

(a) 33 V

(b) 66 v

(c) 80 V

(d) 132 V

Ans: b

Four wires of same material, the same cross-sectional

area and the same length when connected in parallel give a

resistance of 0.25 Q. If the same four wires are connected is

series the effective resistance will be

(a) 1 Q

(b) 2 Q

(c) 3 Q

(d) 4 Q

Ans: d

Which of the following material has nearly zero

temperature co-efficient of resistance?

(a) Manganin

(b) Porcelain

(c) Carbon

(d) Copper

Ans: a

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