Question 1

The highest value reached by the voltage or current in one cycle is called

Accepted Answer

peak value

Answer

peak to peak value

Answer

instantaneous value

Answer

rms value

Question 2

The phase of AC at positive peak from the origin is

Accepted Answer

$\frac{\pi}{2}$

Answer

$2\pi$

Answer

$\frac{3\pi}{2}$

Answer

$\pi$

Question 3

Direct current cannot flow through

Accepted Answer

capacitor

Answer

resistor

Answer

inductor

Answer

transistor

Question 4

A 100$\mu F$ capacitor is connected to an AC source of voltage 24V and frequency 50Hz. What will be the reactance of the capacitor?

Accepted Answer

32$\Omega$

Answer

none

Answer

0.0314 $\Omega$

Answer

40 $\Omega$

Question 5

The expression P = VI holds only when current and voltage are

Accepted Answer

in phase

Answer

at right angles to each other

Answer

at $120^\degree$ to each other

Answer

out of phase

Question 6

Which consumes small power

Accepted Answer

inductor

Answer

all of them

Answer

motor

Answer

resistor

Question 7

In RLC circuit, at resonance the phase difference between inductive and capacitive reactance is

Accepted Answer

$180^\degree$

Answer

$90^\degree$

Answer

$0^\degree$

Answer

$270^\degree$

Question 8

The mean value of AC in a cycle is

Accepted Answer

0

Answer

$I_0$

Answer

$I_o^2$

Answer

$\frac{I_o}{\sqrt2}$

Question 9

In R-L circuit, the phase difference is given by

Accepted Answer

$	heta = 	an ^{-1}\frac{\omega L}{R}$

Answer

$	heta = 	an ^{-1}\frac{\omega }{LR}$

Answer

$	heta = 	an ^{-1}\frac{R}{\omega L}$

Answer

$	heta = 	an ^{-1}\frac{1}{\omega R L}$

Question 10

The power factor is AC circuit is

Accepted Answer

$cos	heta$

Answer

$sin	heta$

Answer

$cot	heta$

Answer

$tan	heta$

Question 11

At resonance frequency the impedance of RLC series circuit is

Accepted Answer

minimum

Answer

none

Answer

zero

Answer

maximum

Question 12

At resonance frequency the impedance of an RLC parallel circuit is

Accepted Answer

maximum

Answer

zero

Answer

none

Answer

minimum

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