Basic electrical MCQ #2
1) The form factor of an AC current is the ratio of
(a)
average value to The RMS value.
(b)
RMS value to the average value.
(c)
maximum value to The RMS value.
(d)
maximum value to the average value.
2) The temperature coefficient of resistance of an
insulator is
(a)
unity.
(b)
zero.
(c)
negative.
(d)
positive.
3) If the current changes from 6A to 3A in 2 seconds and
the inductance is 20H, calculate the emf.
(a)
5V
(b)
10V
(c)
15V
(d)
20V
4) The fuse wire is made of
(a)
nichrome.
(b)
copper.
(c)
lead tin alloy.
(d)
aluminum.
5) The SI unit of power is?
(a)
J/h (joules per hour
(b)
J/s (joules per second)
(c)
Ws (watt-second)
(d)
kW (kilo-watt)
Answer: | 1-b | 2-c | 3-d | 4-c | 5-b |
6) The peak factor of alternating electric current is the
ratio of
(a)
maximum value to The RMS value
(b)
RMS value to the average value.
(c)
maximum value to the average value.
(d)
average value to the RMS value.
7) The dielectric material used in variable capacitor is
generally
(a)
air.
(b)
mica.
(c)
electrolyte.
(d)
ceramic.
8) Out of the following, which one is not a source of
electrical energy?
(a)
Solar cell
(b)
Battery
(c)
Potentiometer
(d)
Generator
9) Power factor of direct current is
(a)
zero.
(b)
lagging.
(c)
unity.
(d)
leading.
10) Reciprocal of the conductance is called
(a)
admittance.
(b)
resistance.
(c)
reluctance.
(d)
reactance.
Answer: | 6-a | 7-a | 8-c | 9-c | 10-b|
11) Which, among the following is a unit for resistivity?
(a)
ohm-meter
(b)
ohm-meter2
(c)
ohm/meter
(d)
ohm/meter2
12) What is the load factor of a power plant?
(a)
Less than unity
(b)
Always more than unity
(c)
Greater than unity
(d)
Normally more than unity
13) What is a load curve?
(a)
A plot of load vs current.
(b)
A plot of load vs duration of time.
(c)
A plot of load vs time.
(d)
Total number of units generated vs time
14) The wire wound resistor are formed by the winding
wire of
(a)
copper or aluminium.
(b)
nichrome.
(c)
tungsten.
(d)
manganin or eureka.
15) What is a load factor?
(a)
The ratio of maximum demand to average load.
(b)
The ratio of average to maximum demand.
(c)
The product of maximum demand and average load.
(d)
The ratio of average load to the plant capacity.
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