Q.46 For sine wave half cycle average value if given by
A. 0.637 x maximum value
B. 2 x maximum value/л
C. Both A and B
D. 2 x maximum value
Ans.: C
Q.47 which of the following is correct equation of r.m.s value?
A. 0.707 x maximum value
B. maximum value / √2
C. 0.707 x average value
D. Both A and B
Ans.: D
Q.48 A voltage is represented by a sine wave and has maximum value of 100 V. what is the average value and r.m.s value?
A. 70.7 V and 63.6 V
B. 63.6 V and 70.7 V
C. 63 V and 33.3 V
D. 33.3 V and 63.6 V
Ans.: A
Q.49 Form factor is the ration of ______.
A. the average value to rms value
B. rms value to average value
C. maximum value to rms value
D. average value to maximum value
Ans.: B
Q.50 what is the value of form factor
A. 1.01
B. 0.111
C. 1.11
D. 11.1
Ans.: C
Q. 51 Peak factor is defined as the ratio of peak or maximum value to ___.
A. average value
B. rms value
C. instantaneous value
D. form factor
Ans.: B
Q.51 which of the following is/are correct for Peak factor?
A. it is also called the crest factor
B. it is also called the amplitude factor
C. it value is 1.414
D. all of the above
Ans.: D
Q.52 which of the following give an indication of the shape of a waveform?
A. Peak factor
B. form factor
C. Both A and B
D. average value
Ans.: C
Q.53 If the maximum value of certain waveform is 100, peak factor of 1.5 and form factor is 1.2. Find rms value and the average value?
A. 66.6 and 33.3
B. 66.6 and 55.5
C. 55.5 and 66.6
D. 33.3 and 66.6
Ans.: B
Q.54 A sinusoidal quantity may be represented by a line fixed at one end and rotating counterclockwise at a velocity equal to the angular velocity of the sinusoidal quantity. This rotating line is called the ___.
A. magnitude
B. Phasor
C. direction
D. rotational angle
Ans.: B
Q.55 What is phase?
A. It is the angle which the phasor makes with the another phase
B. It is the length of given phasor with respect to the reference line
C. It is the angle which the phasor makes with the reference line
D. It is the 45º angle which the phasor makes with the reference line
Ans.: C
Q.56 The phase angle is taken positive when measured____ and negative in the ___ direction
A. clockwise, counter-clockwise
B. counter-clockwise, clockwise
C. counter-clockwise, counters clockwise
D. any of the above
Ans.: B
Q.57 _____ sinusoidal quantities may be involved in a.c circuit calculations.
A. only one
B. only two
C. more than one
D. none of the above
Ans.: C
Q.58 If different phasors have the same frequency they will rotate with the ____.
A. different angular speed
B. same angular speed
C. constant angular speed
D. same magnitude
Ans.: B
Q.59 The graphic representation of the phasors or of sinusoidal quantities taken at the same frequency and with proper phase relationships w.r.t each other is called__.
A. sinusoidal waveform
B. rotational frequency
C. phasor diagram
D. any of the above
Ans.: C
Q.60 Following statement(s) is/are true:
A. voltage and current phasors are drawn on the same diagram
B. it is not necessary to use the same scale for voltage and current phasors
C. several current and voltage phasors are drawn on the same diagram
D. all of the above
Ans.: D
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