page 2 | Basic Electronics MCQ Quiz - Multiple Choice Questions & Answers

Q21. In a JFET, drain current is primarily controlled by,

Gate reverse bias

Channel resistance

Size of depletion region

Voltage drop across the channel

Q22. Magnetic amplifiers are used for

voltage amplification

power amplification

current amplification

frequency amplification

Q23. In push pull amplifier there occurs cancellation

of even order harmonics

of all order harmonics

of all odd order harmonics

none of the above

Q24. The maximum efficiency of class B amplifier

50%

78.5%

35%

100%

Q25. Class AB amplifier is often used in power(large signal) amplifiers in order to

get maximum efficiency

remove even harmonics

overcome a cross-over distortion

reduce collector dissipation

Q26. The lower critical frequency of a direct-coupled amplifier with no bypass capacitor is

Variable

0 Hz

Depend on the bias

None of these

Q27. Which of the following is not a characteristic of an ideal Op amp?

The open loop voltage gain is negatively infinite

The open loop voltage gain is zero

The input impedance is infinitely large

The output impedance is zero

Q28. The ideal Op amp has the following characteristics.

\(R_i = \infty, A = \infty, R_o = 0\)

\(R_i = 0, A = \infty, R_o = 0\)

\(R_i = \infty, A = \infty, R_o = \infty\)

\(R_i = 0, A = \infty, R_o = \infty\)

Q29. Current cannot flow to the ground through

A mechanical ground

An ac ground

A virtual ground

An a ordinary ground

Q30. In the operational transconductance amplifier, the transconductance is controlled by

The ac supply voltage

A bias current

The input signal voltage

The manufacturing process

MCQ

BASIC ELECTRONICS