Basic Electrical Engineering (3110005) MCQs

MCQs of AC Circuits

Showing 101 to 110 out of 117 Questions
7 8 9 10 11 12
101.
In any A.C. circuit always
(a) apparent power is more than actual power
(b) reactive power is more than apparent power
(c) actual power is more than reactive power
(d) reactive power is more than actual power
Answer:

Option (a)

102.
Power factor of incadescent bulb is
(a) zero
(b) lagging
(c) leading
(d) unity
Answer:

Option (d)

103.
The power factor of a D.C. circuit is always
(a) less than unity
(b) unity
(c) greater than unity
(d) zero
Answer:

Option (b)

104.
The power measurement in a balanced three-phase circuit can be done by
(a) one wattmeter method only
(b) two wattmeter method only
(c) three wattmeter method only
(d) any of the above
Answer:

Option (d)

105.
The power delievered to a 3-phase load can be measured by the use of two wattmeters only when
(a) load is balanced
(b) load is unbalanced
(c) 3-phase load is connected the source of 3-wires
(d) 3-phase load is connected the source of 4-wires
Answer:

Option (c)

106.
Which of the following statements pertains to resistors only?
(a) They oppose sudden changes in voltages
(b) They can act as energy storage devices
(c) They can dissipate desirable amount of power
(d) None of the above
Answer:

Option (c)

107.
In a purely resistive circuit, average power is ___________ the peak power.
(a) double
(b) one-half of
(c) one-fourth
(d) equal to
Answer:

Option (b)

108.
Unit of inductive reactance is
(a) Henry
(b) millihenry
(c) Wb
(d) Ohm
Answer:

Option (d)

109.
The power factor of practical inductor is
(a) unity
(b) zero
(c) lagging
(d) leading
Answer:

Option (c)

110.
The power factor of an ordinary electric bulb is
(a) zero
(b) unity
(c) slightly more than unity
(d) slightly less than unity
Answer:

Option (d)

Showing 101 to 110 out of 117 Questions
7 8 9 10 11 12