BJT Amplifiers and Oscillators MCQs

Question 1

In a common emitter amplifier, the unbypassed emitter resistor provides

Accepted Answer

current-series feedback

Answer

voltage-shunt feedback

Answer

negative-voltage feedback

Answer

positive -current feedback

Question 2

A single stage transistor amplifier contains .............. and associated circuitry:

Accepted Answer

one transistor

Answer

two transistors

Answer

three transistors

Answer

none of the above

Question 3

It is generally Should have ....

Accepted Answer

high

Answer

low

Answer

very low

Answer

very high

Question 4

When an a.c. amplifier, the along........desired that a transistor ....... input impedance. signal is applied to an operating point moves.......

Accepted Answer

(1 + a)

Answer

a

Answer

(1 +13)

Answer

13

Question 5

If the collector supply is 10 V, then collector cut off voltage under d.c. conditions is ..........

Accepted Answer

10 V

Answer

20 V

Answer

5 V

Answer

2 V

Question 6

In the zero signal conditions, a transistor sees............. load.

Accepted Answer

d.c.

Answer

a.c.

Answer

both d.c. and a.c.

Answer

none of the above

Question 7

If a transistor amplifier draws 2 mA when input voltage is 10 V, then its input impedance is .

Accepted Answer

5 ka

Answer

20 kfl

Answer

0.2

Answer

10 k..Q

Question 8

In a CE amplifier, voltage gain and load resistance respectively. The transistor sees a d.c. load of

Accepted Answer

Rc

Answer

Rc + RL

Answer

RL

Question 9

In practice, the voltage gain of an amplifier is expressed ..........

Accepted Answer

in db

Answer

as volts

Answer

as a number

Answer

none of the above