TS ECET EEE 2016-6

1. In a NPN transistor

A. Emitter and base are 'N'
B. Collector and emitter are 'N'
C. Emitter is 'P' and base is 'N'
D. Collector is 'P' and base is 'N'

Answer : Collector and emitter are 'N'
Explain:-

2. If the time period of Input voltage of a full- wave rectifier Is 40 ms, then the time period of output voltage is

A. 20 ms
B. 40 ms
C. 10 ms
D. 80 ms

Answer : 20 ms
Explain:-

3. In which of the following devices reverso biasing is useful

A. Light emitting diode
B. Zener diode
C. Silicon controlled rectifier
D. LCD

Answer : Zener diode
Explain:-

4. Identify the universal gates from the following

A. NOT and EX-OR
B. AND and NOT
C. NOT and NOR
D. NOR and NAND

Answer : NOR and NAND
Explain:-

5. Current gain is more than unity and voltage gain is almost equal to unity in

A. CE and CB amplifiers
B. CB amplifier only
C. CC amplifier only
D. CE and CC amplifiers

Answer : CC amplifier only
Explain:-

6. The binary value of decimal value 142 is

A. 10001110
B. 11001110
C. 10011100
D. 10001010

Answer : 10001110
Explain:-

7. The two transistor model of a thyristor consists of following two transistors

A. One n-p-n and other p-n-p
B. Both p-n-p
C. Both n-p-n
D. One n-p-n and other UJT

Answer : One n-p-n and other p-n-p
Explain:-

8. LASCR has

A. 4 semiconductor layers and 3 junctions
B. 3 semiconductor layers and 2 junctions
C. 2 semiconductor layer and 2 junctions
D. 3 semiconductor layers and 3 junctions

Answer : 4 semiconductor layers and 3 junctions
Explain:-

9. In a single phase full converter fed by a source having inductance, the number of thyristors conducting during overlap is

A. One
B. Two
C. Three
D. Four

Answer : Two
Explain:-

10. A single phase half bridge Inverter required of feed RL loads, needs

A. Two thyristors
B. Four thyristors
C. Two thyristors and two diodes
D. Four thyristor and four diodes

Answer : Two thyristors and two diodes
Explain:-