Q.16 The time required to complete one cycle is called___.
A. period time
B. rotational
C. frequency
D. angular momentum
Ans.: A
Q.17 The unit of period is__
A. meter
B. second
C. meter per second
D. cycle per second
Ans.: B
Q.18 Which of the following is/are correct?
A. f = 1/T
B. T = 1/f
C. Both A and B
D. T= f
Ans.: C
Q.19 what is periodic time of a system with frequency of 50 Hz?
A. 0.2 sec
B. 0.02 sec
C. 2 sec
D. 0.002 sec
Ans.: B
Q.20 If periodic time is 0.0166 sec. what will be the system frequency?
A. 60 Hz
B. 70 Hz
C. 40 Hz
D. 100 Hz
Ans.: A
Q.21 Angular velocity is
A. time / angular distance
B. angular distance / time
C. angular distance
D. distance per meter square
Ans.: B
Q.22 Which of the following is correct?
A. v = v sin Ѳ
B. V = V sin Ѳ
C. v = Vm sin Ѳ
D. Vm = Vm sin Ѳ
Ans.: C
Q.23 The maximum value of voltage v occur when___.
A. sin Ѳ = 1 or 45º
B. sin Ѳ = 1 or 90º
C. sin Ѳ = 1 or 180º
D. sin Ѳ = 1 or 360º
Ans.: B
Q.24 ___
__ is called an alternator
A. generator
B. dc generator
C. AC generator
D. motor generator set
Ans.: C
Q.25 Angular frequency is
A. measure of rotation rate
B. angular displacement per unit time
C. rate of change of phase of sinusoidal wave
D. all of the above
Ans.: D
Q.26 which of the following is incorrect
A. ω = 2л/T
B. ωT= 2л
C. ω = 2лf/T
D. ω = 2лf rad /s
Ans.: C
Q.27 which of the following is/are not form of sinusoidal equation of voltage?
A. v = Vm sin ωt
B. v = Vm sin 2лft
C. v = Vm sin 2лt/T
D. all of the above
Ans.: D
Q.28 which gives the maximum value of alternating quantity?
A. coefficient of the sine angle
B. sinusoidal equation
C. maximum value of induced emf
D. none of the above
Ans.: B
Q.29 The horizontal axis may me marked in ___.
A. degree
B. second
C. radians
D. any of the above depends on given quantity
Ans.: D
Q.30 What are the advantages of sine waves?
A. the rate of change of any sinusoidal quantity is also sinusoidal
B. the sine wave can be expressed in a simple mathematical form
C. any periodic non sinusoidal wave can be expressed as the sum of a number of sine waves of different frequency
D. all of the above
Ans. D
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