Page 421 - Basic Electrical Engineering
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d. Current will lag the voltage by 45°.
10. The impedance of an R–L series circuit is (50 + j100) Ω at 50 Hz. When the supply frequency
is 100 Hz, the value of impedance will be
a. (50 + j 1000) Ω
b. (50 + j 200) Ω
c. (100 + j 100) Ω
d. (100 + j 200) Ω.
11. A voltage of v = 10 sin (314t + 15°) is applied across an R–L–C series circuit, where R = 5 Ω,
X = 15 Ω, and X = 10 Ω. The current flowing the circuit will be
C
L
a. 0.33 A
b. 1 A
c. 1.414 A
d. 2 A.
12. The resonant frequency in R–L–C series circuit is
a.
b.
c.
d. .
13. A series RLC circuit has R = 50 Ω, L = 50 μH, C = 2 ΩF. The Q-factor of the circuit is
a. 0.1
b. 1
c. 10
d. 2.
14. When a parallel circuit is in resonance, which of the following of the circuit is maximum?
a. Current
