Electrical Engineering Mcqs Practice Test

Question 1

In a parallel LC circuit, if the signal frequency is decreased below the resonant frequency, then________________?

Accepted Answer

A.	XL decreases and XC increases

Question 2

The Q of a tuned amplifier is 50. If the resonant frequency for the amplifier is 1000kHZ, then bandwidth is __________________?

Accepted Answer

D.	20 kHz

Question 3

For frequencies above the resonant frequency , a series LC circuit behaves as a ____________load?

Accepted Answer

B.	Inductive

Question 4

A class C amplifier always drives _____________load?

Accepted Answer

D.	A resonant tank

Question 5

For frequencies below the resonant frequency , a parallel LC circuit behaves as a ______________load?

Accepted Answer

A.	Inductive

Question 6

In the above question, what are the values of cut-off frequencies?

Accepted Answer

B.	1020 kHz , 980 kHz

Question 7

At parallel resonance, the phase angle between the applied voltage and circuit current is _____________?

Accepted Answer

C.	0o

Question 8

At parallel resonance, the ratio L/C is ______________?

Accepted Answer

A.	Very large

Question 9

If L/C ratio of a parallel LC circuit is increased, the Q of the circuit______________?

Accepted Answer

B.	Is increased

Question 10

At series resonance, the net reactive component of circuit current is _______________?

Accepted Answer

A.	Zero

Question 11

At series or parallel resonance, the circuit power factor is ________________?

Accepted Answer

C.	1

Question 12

At series or parallel resonance, the circuit behaves as a ______________ load?

Accepted Answer

B.	Resistive

Question 13

If the resistance of a tuned circuit is increased, the Q of the circuit _______________?

Accepted Answer

B.	Is decreased

Question 14

At series resonance, the phase angle between applied voltage and circuit is______________?

Accepted Answer

C.	0o

Question 15

The dimensions of L/CR are that of _______________?

Accepted Answer

C.	Ohm

Question 16

The Q of an LC circuit is given by _________________?

Accepted Answer

C.	2pfrL / R

Question 17

In parallel resonance, the circuit impedance is_________________?

Accepted Answer

D.	L/CR

Question 18

When either L or C is increased, the resonant frequency of LC circuit ____________?

Accepted Answer

C.	Decreases

Question 19

If Q of an LC circuit increases, then bandwidth ______________?

Accepted Answer

B.	Decreases

Question 20

In a parallel LC circuit, if the input signal frequency is increased above resonant frequency then _______________?

Accepted Answer

A.	XL increases and XC decreases