Alternating Current And Voltage(Electrical Engineering ) Questions and Answers
Question 1. To produce an 800 Hz sine wave, a four-pole generator must be operated at
200 rps
400 rps
800 rps
1,600 rps
Explanation:-
Answer: Option B. -> 400 rps
Question 2. A ramp is the type of waveform characterized by a non-linear increase or decrease in voltage or current.
True
False
Explanation:-
Answer: Option B. -> False
Question 3. The average half-cycle value of a sine wave with a 40 V peak is
25.48 V
6.37 V
14.14 V
50.96 V
Explanation:-
Answer: Option A. -> 25.48 V
Question 4. Amplitude is the maximum value of a voltage or current.
True
False
Explanation:-
Answer: Option A. -> True
Question 5. Sine wave A has a positive-going zero crossing at 45°. Sine wave B has a positive-going zero crossing at 60°. Which of the following statements is true?
Wave A leads wave B by 15°
Wave A lags wave B by 15°
Wave A leads wave B by 105°
Wave A lags wave B by 105°
Explanation:-
Answer: Option A. -> Wave A leads wave B by 15°
Question 6. A sine wave of 15 kHz is changing at a faster rate than a sine wave with a frequency of
25 kHz
12 kHz
18 kHz
1.3 MHz
Explanation:-
Answer: Option B. -> 12 kHz
Question 7. A phasor represents
The magnitude and a quantity direction
The width of a quantity
The phase angle
The magnitude of a quantity
Explanation:-
Answer: Option A. -> The magnitude and a quantity direction
Question 8. When a sine wave has a frequency of 100 Hz in 12 s it goes through
$$\frac{1}{{100}}$$ cycle
12 cycles
120 cycles
1,200 cycles
Explanation:-
Answer: Option D. -> 1,200 cycles
Question 9. If a sine wave goes through 10 cycles in 20 µs, the period is
20 µs
4 µs
2 µs
100 µs
Explanation:-
Answer: Option C. -> 2 µs
Question 10. A waveform has a baseline of 3 V, a duty cycle of 20%, and an amplitude of 8 V. The average voltage value is
