A.C Fundamentals Objective type Questions - Set 09

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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