If $\mathrm{\alpha }$ = 0.98 and current through emitter ${\mathrm{i}}_{\mathrm{e}}$ = 20 mA, the value of $\mathrm{\beta }$ is
(a) 4.9                  (b) 49
(c) 96                   (d) 9.6

Concept Questions :-

Transistor
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

In a PNP transistor working as a common-base amplifier, current gain is 0.96 and emitter current is 7.2 mA. The base current is

(a) 0.4 mA                    (b) 0.2 mA
(c) 0.29 mA                   (d) 0.35 mA

Concept Questions :-

Applications of Transistor
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

If ${\mathrm{l}}_{1}$${\mathrm{l}}_{2}$${\mathrm{l}}_{3}$ are the lengths of the emitter, base and collector of a transistor then
(a)${\mathrm{l}}_{1}$${\mathrm{l}}_{2}$ = ${\mathrm{l}}_{3}$                   (b) ${\mathrm{l}}_{3}$ <${\mathrm{l}}_{2}$${\mathrm{l}}_{1}$
(c) ${\mathrm{l}}_{3}$${\mathrm{l}}_{1}$ < ${\mathrm{l}}_{2}$                 (d) ${\mathrm{l}}_{3}$${\mathrm{l}}_{1}$>${\mathrm{l}}_{2}$

Concept Questions :-

Transistor
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

In an NPN transistor circuit, the collector current is 10 mA. If 90% of the electrons emitted reach the collector, the emitter current (${\mathrm{i}}_{\mathrm{E}}$) and base current (${\mathrm{i}}_{\mathrm{B}}$) are given by
(a) ${\mathrm{i}}_{\mathrm{E}}$ = –1 mA, ${\mathrm{i}}_{\mathrm{B}}$ = 9 mA
(b) ${\mathrm{i}}_{\mathrm{E}}$ = 9 mA, ${\mathrm{i}}_{\mathrm{B}}$ = – 1 mA
(c) ${\mathrm{i}}_{\mathrm{E}}$ = 1 mA, ${\mathrm{i}}_{\mathrm{B}}$ = 11 mA
(d) ${\mathrm{i}}_{\mathrm{E}}$ = 11 mA, ${\mathrm{i}}_{\mathrm{B}}$ = 1 mA

Concept Questions :-

Transistor
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

In a common emitter transistor, the current gain is 80. What is the change in collector current, when the change in base current is 250 $\mathrm{\mu }$
(a) 80 $×$ 250 $\mathrm{\mu }$A

(b) (250 – 80) $\mathrm{\mu }$A

(c) (250 + 80) $\mathrm{\mu }$A

(d) 250/80 $\mathrm{\mu }$A

Concept Questions :-

Transistor
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

Least doped region in a transistor

(a) Either emitter or collector

(b) Base

(c) Emitter

(d) Collector

Concept Questions :-

Transistor
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

The transistors provide good power amplification when they are used in

(a) Common collector configuration

(b) Common emitter configuration

(c) Common base configuration

(d) None of these

Concept Questions :-

Applications of Transistor
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

The transfer ratio of a transistor is 50. The input resistance of the transistor when used in the common-emitter configuration is 1 K$\mathrm{\Omega }$. The peak value for an A.C input voltage of 0.01 V peak is
(a) 100 $\mathrm{\mu }$A                        (b) 0.01 mA
(c) 0.25 mA                       (d) 500 $\mathrm{\mu }$A

Concept Questions :-

Transistor
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

For a transistor the parameter $\mathrm{\beta }$ = 99. The value of the parameter $\mathrm{\alpha }$ is

(a) 0.9                 (b) 0.99
(c) 1                    (d) 9

Concept Questions :-

Transistor
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

In a PNP transistor the base is the N-region. Its width relative to the P-region is

(a) Smaller           (b) Larger
(c) Same              (d) Not related

Concept Questions :-

Transistor