AC FUNDAMENTALS, CIRCUIT AND CIRCUIT THEORY QUIZ

For the same peak value, which of the following wave has the least mean value?

Half wave rectified sine wave

Triangular wave

Square wave

Sine wave

TRUE ANSWER : ?
YOUR ANSWER : ?

When an alternating current passes through an ohmic resistance the electrical power converted into heat is

Active power

None of the listed here

Apparent power

Reactive power

TRUE ANSWER : ?
YOUR ANSWER : ?

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

None of the listed here

Both waves must have zero value at the same time

TRUE ANSWER : ?
YOUR ANSWER : ?

The reactance offered by a capacitor to alternating current of frequency 50 Hz is 20 ohm. If frequency is increased to 100 Hz, reactance becomes __________ ohms.

10

25

5

15

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YOUR ANSWER : ?

Magnitude of current at resonance in R-L-C circuit

Depends upon the magnitude of L

Depends upon the magnitude of R, Land C

Depends upon the magnitude of R

Depends upon the magnitude of C

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YOUR ANSWER : ?

Power factor of the following circuit will be unity

Inductance

None of the listed here

Capacitance

Resistance

TRUE ANSWER : ?
YOUR ANSWER : ?

The power is measured in terms of decibels in case of

Current transformers

Transformers

Electronic equipment

Auto transformers

TRUE ANSWER : ?
YOUR ANSWER : ?

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

141.4 V

282.8 V

111 V

100 V

TRUE ANSWER : ?
YOUR ANSWER : ?

The apparent power drawn by an A.C. circuit is 10 kVA and active power is 8 kW. The reactive power in the circuit is

10 kVAR

16 kVAR

12 kVAR

8 kVAR

TRUE ANSWER : ?
YOUR ANSWER : ?

Inductance affects the direct current flow

At the time of turning on and off

Only at the time of turning off

At all the time of operation

Only at the time of turning on

TRUE ANSWER : ?
YOUR ANSWER : ?

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