Basic electrical MCQ #10
1) An alternating quantity like voltage, current and
power is defined as the one which change ________ as well as _______ with
respect to time.
(a) value,
direction
(b) phase,
polarity
(c)
value, phase
(d) value,
polarity
2) The _______ of an ac quantity is defined as the value
of that quantity at a particular instant of time.
(a) DC
value
(b) peak
value
(c)
instantaneous value
(d) RMS
value
3) Time period T = Time corresponding to _____
(a) one
half cycle
(b) one
cycle
(c) two
cycles
(d) three
cycles
4) The maximum value of an AC quantity is known as ____
(a) instantaneous
value
(b) RMS
value
(c) average value
(d) peak
value
ANSWER: | 1-b | 2-c | 3-b | 4-d |
5) The form factor of which waveform is 1.11.
(a) any
(b) square
(c)
sinusoidal
(d)
triangular
6) The AC voltmeter or ammeter indicates the _____ value.
(a)
average
(b) RMS
(c) Peak
(d) instantaneous
7) The unit of angular velocity is
(a) cycles
per sec
(b)
radians
(c) radians
per sec.
(d) none
of this
8) All the home appliances such as TV, washing machine operates
on the ____
(a) AC voltage
(b) DC
voltage
(C) AC or
DC voltage
(D) pulsating
DC voltage
ANSWER: | 5-c | 6-b | 7-c | 8-a |
9) 1 cycle is equal to ________
(a) 180
degree
(b) PI
radian
(c) 360
degree
(d) 270
degree
10) Form factor is always _________
(a)
greater than 1
(b) less
than 1
(c) equal
to 1
(d) equal
to 0.5
11) The value of peak factor is sinusoidal waveform is
______
(a) 1
(b) 0.707
(c) 1.414
(d) 0
12) The frequency of AC mains voltage is ______
(a) 50 /
60 Hz
(b) 100 /
150 Hz
(c) 250 /
300 HZ
(d) 10 / 20
kHz
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