FET and FET Amplifiers MCQs

Question 1

An SCS may be switched ON by a

Accepted Answer

positive pulse at its cathode gate G2

Answer

positive pulse at its anode

Answer

negative pulse at its cathode

Answer

positive pulse at its anode gate G1

Question 2

The dv / dt effect in an SCR can result in

Accepted Answer

false triggering

Answer

high rate-of-rise of anode voltage

Answer

increased junction capacitance

Answer

low capacitive charging current

Question 3

The di / dt effect in an SCR leads to the formation of

Accepted Answer

local hot spots

Answer

conduction zone

Answer

charge spreading zone

Answer

none of the above

Question 4

SCR turns OFF from conducting state to blocking state on

Accepted Answer

reducing anode current below holiding current value

Answer

reducing gate current

Answer

reversing gate voltage

Answer

applying ac to the gate

Question 5

When a thyristor is negatively biased

Accepted Answer

outer junctions are negatively biased and the inner junction is positively biased

Answer

all the three junctions are negatively biased

Answer

outer junctions are positively biased and the inner junction in negatively biased.

Answer

the junction near the anode is negatively biased and the one near the cathode is positively biased

Question 6

The minimum value of current required to maintain conduction in an SCR is called its ___ current.

Accepted Answer

holding

Answer

commutation

Answer

gate trigger

Answer

breakover

Question 7

Diacs are primarily used as

Accepted Answer

triggering devices

Answer

pulse generators

Answer

surge protection devices

Answer

powr thyristors

Question 8

A FET consists of a

Accepted Answer

all of the above

Answer

source

Answer

drain

Answer

gate

Question 9

FETs have similar properties to

Accepted Answer

NPN transistors

Answer

PNP transistors

Answer

thermonic valves

Answer

unijunction transistors