TRANSISTOR MCQs Part 03

21. In a NPN transistor if the emitter junction is reverse biased and collector junction is also reversed biased the transistor will operate in
a. active region
b. saturation region
c. cutt-off region
d. inverted region

22. In a normally biased NPN transistor the main current crossing the collector junction is
a. a drift current
b. a hole current
c. a diffusion current
d. same as the base current

23. A transistor has
a. Collector
b. Emitter
c. Base
d. II and III only

24. A diac is a semi conductor device which acts as a
a. 2 terminal unidirectional switch
b. 2 terminal bidirectional switch
c. 3 terminal bidirectional switch
d. 4 terminal multi-directional switch

25. In a NPN transistor , when emitter junction is forward biased and collector junction is reverse biased the transistor will operate in
a. active region
b. saturation region
c. cutt-off region
d. inverted region

26. Which of the following is necessary for transistor action ?
a. The base region must be very wide
b. The base region must be very narrow
c. The base region must be made of some insulating material
d. The collector region must be heavily doped

27. A triac is a semi-conductor device which acts as a
a. 2 terminal unidirectional switch
b. 2 terminal bidirectional switch
c. 3 terminal bidirectional switch
d. 4 terminal multi-directional switch

28. The common base short circuit current gain alpha for the transistor is
a. 0.99
b. 1.01
c. 1.001
d. 0.990

29. The common -emitter short circuit current gain
a. 1
b. 199
c. 99
d. 9.9

30. In a transistor leakage current mainly depends on
a. doping of base
b. size of emitter
c. rating of transistor
d. temperature

Previous

Next