MCQs of DC Circuits (Basic Electrical Engineering - 3110005)

Basic Electrical Engineering (3110005) MCQs

MCQs of DC Circuits

Showing 41 to 50 out of 137 Questions

41.

Which of the following bulbs will have the least resistance ?

(a)	220 V, 60 W
(b)	220 V, 100 W
(c)	115 V, 60 W
(d)	115 V, 100 W

42.

The resistance of a 100 W, 200 V lamp is

(a)	100 $Ω$
(b)	200 $Ω$
(c)	400 $Ω$
(d)	1600 $Ω$

43.

Ohm's law is not applicable to

(a)	DC circuits
(b)	high currents
(c)	small resistors
(d)	semi-conductors

44.

Specific resistance of a substance is measured in

(a)	ohms
(b)	mhos
(c)	ohm-cm
(d)	cm/ohm

45.

A wire of resistance R has it length and cross-section both doubled. Its resistance will become

(a)	4 R
(b)	2 R
(c)	R
(d)	R / 4

46.

A heating element of a hot plate on an electric cooking range draws 12 amperes from 240 V mains. How many kWh of energy will be consumed in one hour and 15 minutes

(a)	1.2
(b)	3.2
(c)	6.0
(d)	7.2

47.

Temperature coefficient of resistance is expressed in terms of

(a)	ohms/ohms degree centigrade
(b)	mhos/ohm degree centigrade
(c)	mhos/degree centigrade
(d)	ohms/degree centigrade

48.

The resistance temperature coefficient is defined as

(a)	increase in resistance per degree centigrade
(b)	decrease in resistance per degree centigrade
(c)	the ratio of increase in resistance per degree centigrade to the resistance at 0 degree centigrade
(d)	the ratio of increases in resistance per degree centigrade to the rate of rise of resistance at 0 degree centigrade

49.

The resistance of pure metals ___________

(a)	Increases with an increase in temperature
(b)	Decreases with an increase in temperature
(c)	Remains the same with an increase in temperature
(d)	Becomes zero with an increase in temperature

50.

The resistance of insulators __________

(a)	Increases with an increase in temperature
(b)	Decreases with an increase in temperature
(c)	Remains the same with an increase in temperature
(d)	Becomes zero with an increase in temperature

Showing 41 to 50 out of 137 Questions