# Practice Test: Question Set - 06

**1. In a series L-C circuit at the resonant frequency the**

- (A) Current is maximum

- (B) Current is minimum

- (C) Impedance is maximum

- (D) Voltage across C is minimum

**2. A pure inductance connected across 250 V, 50 Hz supply consumes 100 W. This consumption can be attributed to**

- (A) The big size of the inductor

- (B) The reactance of the inductor

- (C) The current flowing in the inductor

- (D) The statement given is false

**3. In a parallel R-C circuit, the current always _________the applied voltage**

- (A) Lags

- (B) Leads

- (C) Remains in phase with

- (D) None of the above

**4. In a three-phase supply floating neutral is undesirable because it way give rise to**

- (A) High voltage across the load

- (B) Low voltage across the load

- (C) Unequal line voltages across the load

- (D) None of these

**5. An A.C. voltage is impressed across a pure resistance of 3.5 ohms in parallel with a pure inductance of impedance of 3.5 ohms,**

- (A) The current through the resistance is more

- (B) The current through the resistance is less

- (C) Both resistance and inductance carry equal currents

- (D) None of the above

**6. Inductance affects the direct current flow**

- (A) Only at the time of turning off

- (B) Only at the time of turning on

- (C) At the time of turning on and off

- (D) At all the time of operation

**7. The time constant of the capacitance circuit is defined as the time during which voltage**

- (A) Falls to 36.8% of its final steady value

- (B) Rises to 38.6% of its final steady value

- (C) Rises to 63.2% of its final steady value

- (D) None of the above

**8. Power factor of electric bulb is**

- (A) Zero

- (B) Lagging

- (C) Leading

- (D) Unity

**9. If a sinusoidal wave has frequency of 50 Hz with 30 A r.m.s. current which of the following equation represents this wave?**

- (A) 42.42 sin 314 t

- (B) 60 sin 25 t

- (C) 30 sin 50 t

- (D) 84.84 sin 25 t

**10. Capacitive susceptance is a measure of**

- (A) Reactive power in a circuit

- (B) The extent of neutralization of reactive
power in a circuit

- (C) A purely capacitive circuit's ability to
pass current

- (D) A purely capacitive circuit's ability to
resist the flow of current

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