Electronic Devices and Circuits Questions & Answers - Page 2

6.

In which region of a CE bipolar transistor is collector current almost constant?

A.

Saturation region

B.

Active region

C.

Breakdown region

D.

Both saturation and active region

Correct answer is B

It is used as amplifier when it operates in this region.

7.

The word enhancement mode is associated with

A.

tunnel diode

B.

MOSFET

C.

JFET

D.

photo diode

Correct answer is B

MOSFET may be depletion mode or enhancement mode.

8.

Work function of oxide coated cathode is much lower than that of tungsten cathode.

A.

True

B.

False

C.

Cannot say

D.

None of the above

Correct answer is A

Therefore emission current from oxide coated cathode is more.

10.

Calculate the stability factor and change in IC from 25°C to 100°C for, β = 50, RB/ RE = 250, ΔIC0 = 19.9 nA for emitter bias configuration.

A.

42.53, 0.85 μA

B.

40.91, 0.58 μA

C.

40.58, 0.91 μA

D.

41.10, 0.39 μA

Correct answer is A

No explanation has been provided for this answer.