Assertion (A): The reverse saturation current in a semiconductor diode is 4nA at

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Question
Assertion (A): The reverse saturation current in a semiconductor diode is 4nA at 20�C and 32 nA at 50�C.
Reason (R): The reverse saturation current in a semiconductor diode doubles for every 10�C rise in temperature.
Options
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

Correct Answer

Both A and R are true and R is correct explanation of A

Explanation

At 20�C, 4 nA, at 30�C, 8 nA, at 40�C, 16 nA, at 50�C, 32 nA.

Electronic Devices and Circuits problems

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1. A p-n junction diode has
Options
A. low forward and high reverse resistance
B. a non-linear v-i characteristics
C. zero forward current till the forward voltage reaches cut in value
D. all of the above

2. A transistor has a current gain of 0.99 in the CB mode. Its current gain in the CC mode is
Options
A. 100
B. 99
C. 1.01
D. 0.99

3. A transistor has two p-n junctions. The batteries should be connected such that
Options
A. both junctions are forward biased
B. both junctions are reverse biased
C. one junction is forward biased and the other is reverse biased
D. none of the above

4. Assertion (A): The conductivity of p type semiconductor is higher than that of intrinsic semiconductor.
Reason (R): The addition of donor impurity creates additional energy levels below conduction band.
Options
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

5. In a bipolar transistor which current is largest
Options
A. collector current
B. base current
C. emitter current
D. base current or emitter current

6. Calculate the stability factor and change in I_C from 25�C to 100�C for, ? = 50, R_B/ R_E = 250, ?I_C0 = 19.9 nA for emitter bias configuration.
Options
A. 42.53, 0.85 ?A
B. 40.91, 0.58 ?A
C. 40.91, 0.58 ?A
D. 41.10, 0.39 ?A

8. An amplifier without feedback has a voltage gain of 50, input resistance of 1 k? and output resistance of 2.5 k?. The input resistance of the current shunt -ve feedback amplifier using the above amplifier with a feedback factor of 0.2 is
Options
A. 1/11 k?
B. 1/5 k?
C. 5 kW
D. 11 kW

9. Work function is the maximum energy required by the fastest electron at 0 K to escape from the metal surface.
Options
A. True
B. False

10. Crossover distortion behaviour is characteristic of
Options
A. class A O/P stage
B. class B O/P stage
C. class AB output stage
D. common pulse O/P state

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