Page 418 - Basic Electrical Engineering

d. .

12. The form factor of a square wave is

a. 1.11
b. 1.0
c. 0
d. 1.414.

13. Two sinusoidal waves are represented as v = 100 sin (ωt + 30°) and v 200 sin (ωt – 60°).
1
2
The phasor relationship between the voltages can be expressed as
a. v lags v by 90°
1
2
b. v lags v by 90°
1
2
c. v leads v by 30°
1
2
d. v lags v by 60°.
2
1
14. Inductive reactance of a coil of 0.1 H at 50 Hz is
a. 31.4 Ω
b. 62.8 Ω
c. 314 Ω
d. 5 Ω.

15. The power factor of a purely resistive circuit is

a. 1.0
b. 0
c. 0.1
d. 0.5.

16. A sinusoidal voltage is represented as n = 141.4 sin . The RMS value, frequency

and phase angle are respectively

a. 141.4, 628, 60°
b. 100, 100, –60°
c. 141.4, 50, 60°
d. 141.4, 100, 60°.

Answers to Multiple Choice Questions