Transistors – 1 – 7

31. The transistor was invented at Bell Laboratories in 1947 by :

(a) John Bardeen
(b) Walter Brattain
(c) William Shockley
(d) All of the above

ANSWER

EXPLANATION

32. When a transistor is wrongly biased, then

(a) The emitter terminal gets heavily loaded
(b) Excess production of heat is observed at the collector terminal
(c) The output signal gets distorted
(d) The AC load line gets distorted

ANSWER

EXPLANATION

33. Which of the following statements is/are correct ?

(a) Hybrid parameter of transistors can be used only when input signal is large
(b) Out of the four h parameters of transistor, hfe has the least numerical value
(c) Statement A
(d) Statement B

ANSWER

EXPLANATION

34. For a transistor, the current amplification factor :

(a) α is greater than β
(b) α is lesser than β
(c) α is equal to β
(d) α & β always equal to zero

ANSWER

EXPLANATION

35. The transistor must be operated in ……….. when employed as amplifying device.

(a) Saturation region
(b) Cut-off region
(c) Active region
(d) Any of the three regions

ANSWER

EXPLANATION

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