FET and FET Amplifiers MCQs

Question 1

For enhancement-only N-channel MOSFET, polarity of V

Accepted Answer

positive

Answer

negative

Answer

zero

Answer

dependent on the application of the device

Question 2

Regatding application of dual-gate FET, which statement is false?

Accepted Answer

it cannot be used in colour TV and stereo FM demodulators

Answer

it is ideal for mixer applications in communication receivers

Answer

it is used for AGC-driven IF amplifiers

Answer

due to its two independent gates, it has minimum cross modulation

Question 3

For the operation of enhancement-only N-channel MOSFET, value of gate voltage has to be

Accepted Answer

high positive

Answer

high negative

Answer

low positive

Answer

zero

Question 4

In a JFET operating above pinch-off voltage, the

Accepted Answer

drain current remains practically constant

Answer

drain current increases steeply

Answer

drain current starts decreasing

Answer

depletion regions become smaller

Question 5

The main factor which differentiates a DE MOSFET from an E-onty MOSFET is the absence of

Accepted Answer

channel

Answer

insulated gate

Answer

electrons

Answer

P-N junctions

Question 6

The polarity of VGs for E-only MOSFET is

Accepted Answer

depends on P or N-channel

Answer

positive

Answer

negative

Answer

zero

Question 7

A diac is equivalent to a

Accepted Answer

pair of four-layer SCRs

Answer

pair of SCRs

Answer

diode and two resistors

Answer

triac with two gates

Question 8

A UJT has RBB = 10 K and RB2 = 4K. Its intrinsic stand-off ratio is

Accepted Answer

0.6

Answer

0.4

Answer

2.5

Answer

513

Question 9

Regarding triac which statement is false?

Accepted Answer

it is not particularly suited for AC or mains power control

Answer

it is a 5-layer bi-directional semiconductor device

Answer

it can be triggered in response to both positive and negative gate signals

Answer

any one of its main terminals can be used either as cathode or as anode