Transistors – Exercise – 1

26. The turn-on time of a typical transistor is equal to :

(a) Delay time
(b) Rise time
(c) Storage time
(d) Sum of delay time & rise time

27. Match list 1 with list 2 with respect to transistor biasing Biasing Region of operation
(A) When EB & CB junctions are forward biased                   (1) Inverted
(B) When EB & CB junctions are reverse biased                    (2) Cut-off
(C) When EB is forward biased & CB is reverse biased         (3) Active
(D) When EB is reverse & CB is forward biased                     (4) Saturation

(a) A-1, B-2, C-3, D-4
(b) A-4, B-2, C-3, D-1
(c) A-4, B-3, C-2, D-1
(d) A-4, B-1, C-3, D-2

28. Which is the largest transistor current ?

(a) Emitter current
(b) Base current
(c) Collector current
(d) Both Emitter & Collector currents

29. Transistor is said to be in a quiescent state when :

(a) It is unbiased
(b) No current flows through it
(c) No signal is applied to its input
(d) Emitter junction is reverse biased

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

(a) Two discrete diodes connected back-to-back can work as a transistor
(b) Heat sink is a sheet of insulator used todissipate the heat developed at the collector junction of a power transistor
(c) The collector leakage current is strongly independent of temperature
(d) The collector junction of transistor is heavily doped

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