Practice A.C Fundamentals, Circuits And Circuit Theory Multiple Choice Questions with Answers Quiz-6 - MCQGeeks.com

Q.1.

The phase difference between voltage and current wave through a circuit element is given as 30°. The essential condition is that

Both waves must have same frequency
Both waves must have identical peak values
Both waves must have zero value at the same time
None of the above

Q.2.

Capacitive reactance is more when

Capacitance is less and frequency of supply is less
Capacitance is less and frequency of supply is more
Capacitance is more and frequency of supply is less
Capacitance is more and frequency of supply is more

Q.3.

Time constant of a capacitive circuit

Increases with the decrease of capacitance and decrease of resistance
Increases with the decrease of capacitance and increase of resistance
Increases with the increase of capacitance and decrease of resistance
Increase with increase of capacitance and increase of resistance

Q.4.

A pure capacitor connected across an A.C. voltage consumedW. This is due to

The capacitive reactance in ohms
The current flowing in capacitor
The size of the capacitor being quite big
The statement is incorrect

Q.5.

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

Lags
Leads
Remains in phase with
None of the above

Q.6.

Skin effect occurs when a conductor carries current at _________ frequencies.

Very low
Low
Medium
High

Q.7.

In a pure capacitive circuit if the supply frequency is reduced to 1/the current will

Be reduced by half
Be doubled
Be four times at high
Be reduced to one fourth

Q.8.

All the rules and laws of D.C. circuit also apply to A.C. circuit containing

Capacitance only
Inductance only
Resistance only
All above

Q.9.

The equation ofHz current sine wave having r.m.s. value ofA is

60 sin 25 t
60 sin 50 t
84.84 sin 3141
42.42 sin 314 t