FET and FET Amplifiers MCQs

Question 1

A LASCR is just like a conventional SCR except that it

Accepted Answer

has no gate terminal

Answer

cannot carry large current

Answer

can also be light-triggered

Answer

cannot be pulse-triggered.

Question 2

A unijunction transistor has

Accepted Answer

two bases and one emitter

Answer

anode, cathode and a gate

Answer

two anode and one gate

Answer

anode, cathode and two gates

Question 3

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

Accepted Answer

0.6

Answer

0.4

Answer

2.5

Answer

5/3

Question 4

An SCR conducts appreciable current when its with respect to cathode.

Accepted Answer

anode and gate are both positive

Answer

anode and gate are both negative

Answer

anode is negative and gate is positive

Answer

gate is negative and anode is positive

Question 5

After firing an SCR, the gating pulse is removed. The current in the SCR will

Accepted Answer

remains the same

Answer

immediately fall to zero

Answer

rise up

Answer

rise a little and then fall to zero

Question 6

An SCR may be turned OFF by

Accepted Answer

all of the above

Answer

interrupting its anode current

Answer

reversing polarity of its anode-cathode voltage

Answer

low-current dropout

Question 7

A triac behaves like two

Accepted Answer

inverse parallel-connected SCRs with common gate

Answer

diodes in series

Answer

four-layer diodes in parallel

Answer

resistors and one diode

Question 8

A triac can be triggered into conduction by

Accepted Answer

both (b) and (c)

Answer

only positive voltage at either anode

Answer

positive or negative voltage at either anode

Answer

positive or negative voltage at gate

Question 9

An SCS has

Accepted Answer

one anode, one cathode and two gates

Answer

four layers and threeterminals

Answer

three layers and four terminals

Answer

two anodes and two gates