Complex AC MCQs

Question 1

At half-power points of a resonance curve, the current is times the maximum current.

Accepted Answer

1/

Answer

1/2

Answer

2

Question 2

A resonance curve for a series circuit is a plot of frequency versus

Accepted Answer

current

Answer

voltage

Answer

impedance

Answer

reactance

Question 3

Higher the Q of a series circuit,

Accepted Answer

narrower its pass band

Answer

broader its resonance curve

Answer

greater its bandwidth

Answer

sharper its resonance

Question 4

Selectivities of different resonance circuits are compared in terms of their

Accepted Answer

bandwidths

Answer

impedance

Answer

reactances

Answer

frequencies

Question 5

The power factor of a series R-L-C circuit at its half-power points is

Accepted Answer

lagging or leading

Answer

unity

Answer

lagging

Answer

leading

Question 6

The voltage applied across an R-L circuit is equal to

Accepted Answer

phasor sum

Answer

arithmetic sum

Answer

sum of the squares

Answer

algebraic sum

Question 7

A parallel A.C. circuit in resonance will

Accepted Answer

have a high impedance

Answer

have current in each section equal to the line current

Answer

have a high voltage developed across each inductive and capacitive section

Answer

act like a resistor of low value

Question 8

The dynamic impdeance of an R-L and C parallel circuit at resonance is ohm

Accepted Answer

L/CR

Answer

R/LC

Answer

C/LR

Answer

LC/R

Question 9

A parallel resonant circuit can be used

Accepted Answer

both (a) and (b)

Answer

as a high impedance

Answer

to reject a small band of frequencies

Answer

to amplify certain frequencies