Basic Electrical Engineering (3110005) MCQs

MCQs of AC Circuits

Showing 91 to 100 out of 117 Questions
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91.
The r.m.s. value of a sine wave is 100 A. Its peak value is
(a) 70.7 A
(b) 141.4 A
(c) 150 A
(d) 282.8 A
Answer:

Option (b)

92.
Two waves of the same frequency have opposite phase when the phase angle between them is
(a) 360°
(b) 180°
(c) 90°
(d) 0°
Answer:

Option (b)

93.
The r.m.s. value and mean value is the same in the case of
(a) triangular wave
(b) sine wave
(c) square wave
(d) half wave rectified sine wave
Answer:

Option (c)

94.
For the same peak value which of the following wave will have the highest r.m.s. value?
(a) square wave
(b) half wave rectified sine wave
(c) triangular wave
(d) sine wave
Answer:

Option (a)

95.
For the same peak value, which of the following wave has the least mean value?
(a) half wave rectified sine wave
(b) triangular wave
(c) sine wave
(d) square wave
Answer:

Option (a)

96.
Power factor of an electrical circuit is equal to
(a) R/Z
(b) cosine of phase angle difference between current and voltage
(c) kW/kVA
(d) all of the above
Answer:

Option (d)

97.
The best place to install a capacitor is
(a) very near to inductive load
(b) across the terminals of inductive load
(c) far away from the inductive load
(d) any where
Answer:

Option (b)

98.
Poor power factor
(a) reduces load handling capability of electrical system
(b) results in more power losses
(c) results in more voltage drop
(d) all of the above
Answer:

Option (d)

99.
Capacitors for power factor correction are rated in
(a) kW
(b) kVA
(c) kV
(d) kVAR
Answer:

Option (d)

100.
Power circuit of the following circuit will be zero
(a) resistive
(b) purely inductive
(c) purely capacitive
(d) both b and c
Answer:

Option (d)

Showing 91 to 100 out of 117 Questions
7 8 9 10 11 12