Page 422 - Basic Electrical Engineering

b. Impedance
c. Admittance
d. Power factor.

15. In an R–L–C series circuit for a frequency less than the resonant frequency,

a. X > X C
L
b. X > X L
C
c. X = X L
C

d. .

16. In an R–L–C series circuit, if the frequency is made more than the resonant frequency the
circuit will effectively be

a. inductive
b. capacitive
c. resistive
d. oscillatory.

17. Two impedances, Z1 = 4 + j4 W and Z2 = 4 – j4 Ω are connected in parallel. Their equivalent
impedance is

a. 8 + j8 Ω
b. 4 + j0 Ω
c. 8 – j8 Ω
d. 8 + j0 Ω.

18. When an inductance, L and a resistance, R are connected in parallel across an ac supply, the
current drawn by the two parallel branches will be out of phase by

a. 0°
b. 90°
c. 180°
d. 45°.

19. When an inductance, L and a capacitance, C are connected in parallel across an ac supply, the
current drawn by the two parallel branches will be out of phase by

a. 0°
b. 90°
c. 180°
d. 45°.

20. In an R–L circuit, XL = R. The power factor angle q the circuit is