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Electronics and Communication Engineering - Electromagnetic Field Theory

Exercise : Electromagnetic Field Theory - Section 9
16.
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?
S1 is False, S2 is true
S1 and S2 both are true
S1 and S2 both are false
S1 is true, S2 is false
Answer: Option
Explanation:
No answer description is available. Let's discuss.
17.

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.

Both A and R are true and R is correct explanation of A
Both A and R are true but R is not a correct explanation of A
A is true but R is false
A is false but R is true
Answer: Option
Explanation:
No answer description is available. Let's discuss.
18.
The concentration of minority carriers in an extrinsic semiconductor under equilibrium is
directly proportional to the doping concentration
inversely proportional to doping concentration
directly proportional to intrinsic concentration
inversely proportional to the intrinsic concentration
Answer: Option
Explanation:
No answer description is available. Let's discuss.
19.
The mean life time of the minority carriers is in the range of a few
seconds
milli seconds
micro seconds
nano seconds
Answer: Option
Explanation:
No answer description is available. Let's discuss.
20.
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
CB-LO, CC-MO, CE-HI
CB-LO, CC-HI, CE-MO
CB-MO, CC-HI, CE-LO
CB-HI, CC-LO, CE-MO
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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