MCQ on Electronics and Communication

11-IGBT stands for

(A) Insulated Gate Based Thyristor

(B) Insulated Gate Bipolar Thyristor

(C) Intrinsic Gate Bipolar Transistor

(D) Insulated Gate Bipolar Transistor

 

12-Trimmer is a variable

(A) resistor

(B) inductor

(C) capacitor

(D) none of the above

 

13-The ripple output frequency of bridge rectifier in 50 Hz supply is ___ Hz.

(A) 25

(B) 50

(C) 60

(D) 100

 

14-In On-line UPS, the battery is connected

(A) All the time to the inverter

(B) During mains failure

(C) During charging time only

(D) All the time

 

15-Binary number system uses ___ symbols.

(A) 2

(B) 8

(C) 10

(D) 16

 

16-Which of the following is not used for making LED?

(A) Germanium

(B) Gallium arsenide

(C) Gallium phosphide

(D) Gallium arsenide phosphide

 

17-The program counter in 8085 microprocessor is of ___ bit.

(A) 4

(B) 8

(C) 16

(D) 32

 

18-The doping concentration in Zener diode is

(A) very low

(B) very high

(C) zero

(D) infinity

 

19-The channel width in PAL system is

(A) 5.5 MHz

(B) 4.433 MHz

(C) 38.9 MHz

(D) 7 MHz

 

20-The voltage gain of an emitter follower configuration cannot be more than

(A) 0.5

(B) 1

(C) 10

(D) 100

 

ANSWERS:

11-(D), 12-(C), 13-(D), 14-(A), 15-(A), 16-(C), 17-(C), 18-(B), 19-(D), 20-(B)