Quiz sheet for power in an AC circuit.

The apparent power in an a.c. circuit is expressed in:

A) V A 

B) Watts

C) volts

D) kiloWatts

ANSWER: A

The frequency of the power wave for an a.c. circuit is:

A) double the supply frequency

B) half the supply frequency

C) the same as the supply frequency

D) dependent on the load

ANSWER: A

If a non-inductive resistor is used on 230 V d.c., instead of 230 V a.c., it will: 

A) produce the same heat

B) produce less heat

C) burn out

D) absorb less power

ANSWER: A

The power factor of an a.c. circuit may have a value between the limits of:

A) 0 to 1

B) 0.5 to 1

C) 0 to 0.866

D) 0 to 2

ANSWER: A

A wattmeter, connected to measure power in a single phase a.c. circuit indicates the:

A) RMS value

B) maximum value

C) average value

D) instantaneous value

ANSWER: C

True power in an AC circuit is equal to;

A) Current times Voltage times the Power factor

B) Voltage Squared times the Current times the Power factor

C) The Power Factor

D) Voltage times Resistance

ANSWER: A

If a choke coil replaces a resistor in an a.c. circuit and the same current is maintained the power absorbed will be:

A) less

B) greater

C) the same

D) proportional to the current

ANSWER: A


Last modified: Monday, 31 May 2021, 9:26 PM