Alternating Current MCQs - Quiz 1

1. The current whose magnitude undergoes a definite cycle of change during a definite interval of time is known as ___
A) Direct current
B) Alternating current
C) Changing current
D) None of the above

The correct answer is B

2. There are ___ electrical degrees in a cycle.
A) 180
B) 0
C) 360
D) 90

The correct answer is 360

3. The plot of instantaneous values of the varying quantity with time is called ___
A) Waveform
B) Cycle
C) Frequency
D) Phase

The correct answer is A

4. If Ae is electrical angle, Am is mechanical angle and P is number of poles, then the relation between electrical degrees and mechanical degrees is ___.
A) Ae = 2.P.Am
B) Ae = P.Am
C) Ae = (P/2).Am
D) None of the above

The correct answer is C

5. If a conductor moves through 360 mechanical degrees in a 2 pole machine, it is supposed to generate ___ electrical degrees.
A) 360
B) 720
C) 180
D) 90

The correct answer is A

6. If a conductor moves through 360 mechanical degrees in a 4 pole machine, it is supposed to generate ___ electrical degrees.
A) 360
B) 720
C) 180
D) 90

The correct answer is C

7. In a six pole motor, electrical angle = ___ times mechanical angle.
A) 2
B) 4
C) 6
D) 3

The correct answer is D

8. The number of cycles per second is called ___.
A) Phase
B) Frequency
C) Amplitude
D) None of the above

The correct answer is B

9. The unit of frequency is ___
A) Hertz
B) Radian
C) Kelvin
D) None of the above

The correct answer is A

10. Time period is the time taken to complete ___ cycle
A) One
B) Two
C) Three
D) Four

The correct answer is A