Applied Electricity

Question 1

11 milliampere equals

Easy

A. 0.001 A B. 1,000 A C. 0.1 A D. 0.01 A

Question 2

2In a three-pin plug wired to the IEC colour code, the earth wire is

Easy

A. red B. blue C. brown D. green and yellow

Question 3

3The internal resistance of a cell causes

Medium

A. no effect B. the terminal voltage to fall when current flows C. an infinite current D. the e.m.f. to rise

Question 4

4The unit of electric charge is the

Easy

A. volt B. ampere C. coulomb D. ohm

Question 5

5A person receiving an electric shock should first be

Easy

A. pulled by the bare hand B. disconnected from the supply by switching off C. left alone D. splashed with water

Question 6

6Power factor correction in industry is usually done by adding

Hard

A. capacitors in parallel B. fuses C. inductors in parallel D. resistors in series

Question 7

7Hysteresis loss in a transformer core is reduced by using

Hard

A. solid iron B. copper C. aluminium D. silicon steel

Question 8

8A 13 A fuse is suitable for an appliance of about

Medium

A. 50 W B. 3,000 W on 230 V C. 10,000 W D. 100 W only

Question 9

9An AC supply has a frequency of 50 Hz. What is its period?

Easy

A. 0.2 s B. 0.02 s C. 50 s D. 0.5 s

Question 10

10A half-wave rectifier fed with 12 V r.m.s. gives a peak output of about

Hard

A. 16.3 V (ignoring diode drop) B. 12 V C. 8.5 V D. 24 V