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 μ
(a) 80 × 250 μA

(b) (250 – 80) μA

(c) (250 + 80) μA

(d) 250/80 μA

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Least doped region in a transistor 

(a) Either emitter or collector

(b) Base

(c) Emitter

(d) Collector

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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

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Applications of Transistor
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The transfer ratio of a transistor is 50. The input resistance of the transistor when used in the common-emitter configuration is 1 KΩ. The peak value for an A.C input voltage of 0.01 V peak is 
(a) 100 μA                        (b) 0.01 mA
(c) 0.25 mA                       (d) 500 μA

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For a transistor the parameter β = 99. The value of the parameter α is

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

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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

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A common emitter amplifier is designed with NPN transistor (α = 0.99). The input impedance is 1 KΩ and load is 10 KΩ. The voltage gain will be 

(a) 9.9                           (b) 99
(c) 990                          (d) 9900

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Applications of Transistor
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The symbol given in figure represents 

(a) NPN transistor
(b) PNP transistor
(c) Forward biased PN junction diode
(d) Reverse biased NP junction diode

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The most commonly used material for making transistor is

(a) Copper                 (b) Silicon
(c) Ebonite                 (d) Silver

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An NPN-transistor circuit is arranged as shown in figure. It is
 

(a) A common base amplifier circuit
(b) A common emitter amplifier circuit
(c) A common collector amplifier circuit
(d) Neither of the above

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