Exercise: Electronic Devices And Circuits

Questions for: Electronic Devices And Circuits

Choose the correct match for input resistance of various amplifier configurations shown below configuration.
CB : Common Base LO : Low
CC : Common Collector  MO : moderate
CE : Common EmitterHI: High
A:
CB-LO, CC-MO, CE-HI
B:
CB-LO, CC-HI, CE-MO
C:
CB-MO, CC-HI, CE-LO
D:
CB-HI, CC-LO, CE-MO
Answer: B
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The mean life time of the minority carriers is in the range of a few
A:
seconds
B:
milli seconds
C:
micro seconds
D:
nano seconds
Answer: D
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The concentration of minority carriers in an extrinsic semiconductor under equilibrium is
A:
directly proportional to the doping concentration
B:
inversely proportional to doping concentration
C:
directly proportional to intrinsic concentration
D:
inversely proportional to the intrinsic concentration
Answer: B
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Assertion (A): A BJT can be used as a switch.

Reason (R): In forward active mode emitter base junction is forward biased and base collector junction is reverse biased.

A:
Both A and R are true and R is correct explanation of A
B:
Both A and R are true but R is not a correct explanation of A
C:
A is true but R is false
D:
A is false but R is true
Answer: B
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Consider the following statement S1 and S2.

S1: The β of a bipolar transistor reduces if the base width is increased.

S2: the β of a bipolar transistor increases if the doping concentration in the base is increased.

Which one of the following is correct?
A:
S1 is False, S2 is true
B:
S1 and S2 both are true
C:
S1 and S2 both are false
D:
S1 is true, S2 is false
Answer: D
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