Complex AC MCQs

Question 1

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

Accepted Answer

10 S/

Answer

5 SI

Answer

15 S2

Answer

30

Question 2

What will be the phase angle between two alternating waves of equal frequency, when one wave attains maximum value the other is at zero value?

Accepted Answer

900

Answer

0?

Answer

450

Answer

1800

Question 3

The purpose of a parallel resonance is to magnify

Accepted Answer

voltage

Answer

current

Answer

power

Answer

frequency

Question 4

In an A.C. circuit power is dissipated

Accepted Answer

resistance only

Answer

inductance only in

Answer

capacitance only (d) none of the above

Question 5

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

Accepted Answer

leads

Answer

lags

Answer

remains in phase with

Answer

none of the above

Question 6

At frequencies the parallel circuit behaves as purely resistive.

Accepted Answer

very high

Answer

low

Answer

very low

Answer

high

Question 7

In a sine wave the slope is constant

Accepted Answer

no where

Answer

between 0? and 900

Answer

between 90? and 1800

Answer

between 180? and 2700

Question 8

The power is measured decibles in case of

Accepted Answer

electronic equipment

Answer

transformers

Answer

current transformers

Answer

auto-transformers

Question 9

Capacitive susceptance is a measure of

Accepted Answer

a purely capacitive circuit's ability to Pass current

Answer

recative power in a circuit

Answer

the extent of neutralisationof reactive power in a circuit

Answer

a purely capacitive circuit's ability to resist the flow of current