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)