Basic Electrical Engineering (3110005) MCQs

MCQs of AC Circuits

Showing 111 to 117 out of 117 Questions
7 8 9 10 11 12
111.
Skin effect occurs when a conductor carries current at _________ frequencies.
(a) very low
(b) low
(c) high
Answer:

Option (c)

112.
The power factor of an ac circuit lies between
(a) 0 and 1
(b) -1 and 1
(c) 0 and -1
(d) none of the above
Answer:

Option (a)

113.
Unit of reactive power is
(a) VA
(b) watt
(c) VAR
(d) ohm
Answer:

Option (c)

114.
With the increase in applied frequency, the dielectric loss in a material will
(a) increase
(b) decrease
(c) remain constant
(d) become zero
Answer:

Option (a)

115.
In an ac circuit, if voltage V = (a+jb) and current I = (c+jd), then power is given by
(a) ac+ad
(b) ac+bd
(c) bc-ad
(d) bc+ad
Answer:

Option (b)

116.
When a sinusoidal voltage is applied across RL parallel circuit so that R = XL the phase angle will be
(a) 45° lagging
(b) 45° leading
(c) 90° lagging
(d) 90° leading
Answer:

Option (a)

117.
The form factor of sinusoidal alternating current is
(a) 1
(b) 0
(c) 1.11
(d) 1.15
Answer:

Option (c)

Showing 111 to 117 out of 117 Questions
7 8 9 10 11 12