According to International convention of colour coding of insulation of wires in a cable :
live is red, neutral is blue and earth is brown
live is red, neutral is green and earth is black
live is brown, neutral is blue and earth is black
live is brown, neutral is light blue and earth is green
In what unit does the domestic electric meter measure the electrical energy consumed?
coulomb meter
kilowatt hour
Volt
Joule
At what voltage and frequency is the a.c. supplied to our houses?
220 V, 50 Hz
11 V, 1/50 Hz
220 V, 100 Hz
11 V, 50 Hz
An MCB which cuts off the electrical supply in case of short circuiting or over loading works on the
chemical effect of current
heating effect of current
magnetic effect of current
electroplating effect of current
The electrical appliances in the houses are connected with each other in
parallel
series
a combination of series and parallel circuits
either series or parallel
1 kWh =
3.6 x 106J
3.6 x 103J
3.6 x 109J
3.6 x 10-3J
If 0.1 A current flows through a bulb working at 250 V, how many hours are required to consume one unit of electricity?
30 hrs
10 hrs
40 hrs
50 hrs
Circuit breaker device which can be used in place of fuse wire in domestic electric wiring is called
CBD
DCB
MCD
MCB
An electric bulb is rated 220 V and 100 W. When it is operated on 110 V, the power consumed will be
100 W
75 W
50 W
25 W
A geyser has a rating of 2 kW, 240 V. What is the cost of using it for 30 minutes, if the cost of electricity is Rs.3 per commercial unit?
Rs.3
Rs.6
Rs.9
Rs.15
