BJT Amplifiers and Oscillators MCQs

Question 1

Power that a transistor can safely dissipate is given by expression

Accepted Answer

PD = (Tj ? Tc) / Ojc

Answer

PD = Ojc / (TJ ?

Answer

PD = (TJ +/ Ojc

Answer

none of these

Question 2

It is desired to design an amplifier with a voltage gain of 10,000. Output should be inphase with the input. Available CB stage has a gain of 100 per stage and CE has a per stage gain of 25. The designed amplifier shall have

Accepted Answer

four cascaded stages of CE configuration

Answer

two cascaded stages of CB configuration

Answer

two cascaded stages of CE configuration

Answer

three cascaded stages of CE configuration followed by an emitter follower stage.

Question 3

The hybrid equivalent circuit of a transistor has

Accepted Answer

Thevenin's equivalent circuit at the input and Norton's equivalent circuit at the output

Answer

Thevenin's equivalent circuit at the input as well as output

Answer

Norton's equivalent circuit at the input and Thevenin's equivalent circuit at the output

Answer

none of these

Question 4

Hybrid parameters (h?parameters) are used for

Accepted Answer

small signal analysis of amplifiers

Answer

large signal analysis of amplifiers

Answer

determining voltage and current gains of a CE amplifier circuit

Answer

none of these

Question 5

hib in terms of common-base parameters is given by

Accepted Answer

hib = hie/(1 + hfe)

Answer

hib = hie/(1 + hie)

Answer

hib = hie

Answer

done of these

Question 6

If hib = 25L2, hib = -0.99, then hie is

Accepted Answer

2.5

Answer

4k

Answer

10 kfi

Answer

indeterminate from given data

Question 7

A particular transistor has NI = -0.98. Its hie is

Accepted Answer

49

Answer

200

Answer

indeterminate from given data

Answer

none of these

Question 8

h-parameters of a transistor

Accepted Answer

are dependent upon collector current

Answer

are constant

Answer

vary with temperature

Answer

none of chese

Question 9

An amplifier's overall voltage-gain is almost the same as the transistor's voltage gain provided

Accepted Answer

he RL << 1

Answer

he RL >> 1

Answer

he RL = 1

Answer

he RL is infinite