Practice Test: Question Set - 09
1. All definitions of power factor of a series R-L-C circuit are correct except
- (A) Ratio of net reactance and impedance
- (B) Ratio of kW and kVA
- (C) Ratio of J and Z
- (D) Ratio of W and VA
2. Ohm is unit of all of the following except
- (A) Inductive reactance
- (B) Capacitive reactance
- (C) Resistance
- (D) Capacitance
3. If two sinusoids of the same frequency but of different amplitudes and phase angles are subtracted, the resultant is
- (A) A sinusoid of the same frequency
- (B) A sinusoid of half the original frequency
- (C) A sinusoid of double the frequency
- (D) Not a sinusoid
4. Form factor for a sine wave is
- (A) 1.414
- (B) 0.707
- (C) 1.11
- (D) 0.637
5. All the rules and laws of D.C. circuit also apply to A.C. circuit containing
- (A) Capacitance only
- (B) Inductance only
- (C) Resistance only
- (D) All above
6. In R-L-C series resonant circuit magnitude of resonance frequency can be changed by changing the value of
- (A) R only
- (B) L only
- (C) C only
- (D) L or C
7. In an A.C. circuit power is dissipated in
- (A) Resistance only
- (B) Inductance only
- (C) Capacitance only
- (D) None of the above
8. The r.m.s. value of half wave rectified sine wave is 200 V. The r.m.s. value of full wave rectified AC. will be
- (A) 282.8 V
- (B) 141.4 V
- (C) 111 V
- (D) 100 V
9. The voltage of domestic supply is 220 V. This figure represents
- (A) Mean value
- (B) r.m.s. value
- (C) Peak value
- (D) Average value
10. The transient currents are associated with the
- (A) Changes in the stored energy in the
inductors and capacitors
- (B) Impedance of the circuit
- (C) Applied voltage to the circuit
- (D) Resistance of the circuit
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