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MCQ Questions for CBSE Class 12 with Answers
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Alternating Current and Voltage Gate & PSU MCQ Questions With...
1.
A vector quantity has
Only magnitude
Only direction
Both (a) and (b)
none of these
2.
The repetition of a variable quantity, recurring at equal intervals, is known as ___________
Waveform
Instantaneous value
Cycle
Period
3.
The variation of a quantity such as voltage or current shown on a graph is known as ___________
Waveform
Peak value
Instantaneous value
Period
4.
In AC generator, maximum emf generated at an angle of
0 and 90
90 and 180
90 and 270
180 and 360
5.
The effective voltage value is
25%
50%
71%
90%
6.
The number of instantaneous values between zero and the peak value is
Zero
One
Eleven
Infinity
7.
Alternating voltage (V) is represented by the equation
V(t) = Vm eωt
V(t) = Vm sin ωt
V(t) = Vm cot ωt
V(t) = Vm tan ωt
8.
The average current/ voltage value will not be zero only if it is
step up
rectified
amplified
intensified
9.
AC generators works based on
Faraday's Law
Lenz Law
Newton's Law
electrostatic law
10.
The resistor in an AC will cause
no phase difference
V lead I
I lead V
I lags V
11.
Voltage leads the current in an AC generators can be referred to
resistance
capacitance
inductance
12.
AC generators used to produce alternating current by converting
kinetic energy into potential energy
potential energy into electrical energy
kinetic energy into electrical energy
electrical energy into kinetic energy
13.
High potential voltage produced by three-phase generators commonly used in
filament
X-ray tube
transformer
anode
14.
The combination of resistance, capacitance and induntance is referred to
impedance
reactance
angular frequency
amplitude
15.
The most common waveforms of ac is
square wave
triangular wave
complex wave
sine wave
16.
What is the duration of one cycle known as _________
Waveform
Peak value
Instantaneous value
Period
17.
The distance of the waveform travel in one cycle is referred to
amplitude
wavelength
time
frequency
18.
The maximum instantaneous value measured from zero value is known as?
Peak value
Peak to peak value
Cycle
Period
19.
The unit of frequency is
Cycle
Cycle-second
Hertz/second
hertz
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