Electronics and Communication Engineering - Electronic Devices and Circuits

21. 

Holes act like

A. positive charges
B. neutral atoms
C. negative charges
D. crystals

Answer: Option A

Explanation:

No answer description available for this question. Let us discuss.

22. 

Assertion (A): Silicon is less sensitive to changes in temperature than germanium.

Reason (R): It is more difficult to produce minority carriers in silicon than in germanium.

A. Both A and R are true and R is correct explanation of A
B. Both A and R are true but R is not a correct explanation of A
C. A is true but R is false
D. A is false but R is true

Answer: Option A

Explanation:

No answer description available for this question. Let us discuss.

23. 

The number of protons in a silicon atom is

A. 32
B. 28
C. 14
D. 4

Answer: Option C

Explanation:

No answer description available for this question. Let us discuss.

24. 

The emitter follower is widely used in electronic instrument because

A. its voltage gain is less than unity
B. its voltage gain is very high
C. its O/P Impedance is low and input impedance is high
D. its O/P Impedance is high and I/P impedance is low

Answer: Option C

Explanation:

No answer description available for this question. Let us discuss.

25. 

A cascade amplifier stage is equivalent to

A. a common emitter stage followed by a common stage
B. a common base stage followed by an emitter follower
C. an emitter follower stage followed by a common base stage
D. a common base stage followed by a common emitter stage

Answer: Option A

Explanation:

No answer description available for this question. Let us discuss.