Electronics and Communication Engineering questions and answers

Electronics and Communication Engineering Questions and Answers

Prepare for your Electronics and Communication Engineering exams/aptitude tests, assess your knowledge of electronics and communication equipment with these ECE questions and answers.

16.

The v-i characteristics of a FET is shown in the figure. In which region is the device biased for small signal amplification

A.

AB

B.

BC

C.

CD

D.

BD

Correct answer is B

Small signal amplifier operation is in constant current region of characteristics.

17.

In a bipolar transistor, which current is largest

A.

collector current

B.

base current

C.

emitter current

D.

base current or emitter current

Correct answer is C

Emitter current is larger, collector current is slightly less than emitter current and base current is very small.

18.

In a zener diode

A.

the forward current is very high

B.

sharp breakdown occurs at a certain reverse voltage

C.

the ratio v-i can be negative

D.

there are two p-n junctions

Correct answer is B

When reverse voltage equals breakdown value, it starts conducting and voltage does not increase further.

19.

A particular green LED emits light of wavelength 5490, Å, the energy bandgap of the semiconductor material used there is .. h = 6.6 x 10-34 J sec.

A.

2.26 eV

B.

1.98 eV

C.

1.17 eV

D.

0.74 eV

Correct answer is A

From Plank equation, E = hc/λ joule

to convert it into electron volt it will be divided by 1.6 x 10-19.

20.

A zener diode is used in

A.

voltage regulator circuit

B.

amplifier circuits

C.

both voltage regulator and amplifier circuit

D.

none of the above

Correct answer is A

Zener diode is used only in voltage regulator circuits.


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