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Electronics and Communication Engineering - Electronic Devices and Circuits

Exercise : Electronic Devices and Circuits - Section 1
21.
Recombination produces new electron-hole pairs
True
False
Answer: Option
Explanation:

Due to recombination the number of electron-hole pairs is reduced.

22.
An amplifier without feedback has a voltage gain of 50, input resistance of 1 kΩ and output resistance of 2.5 kΩ. The input resistance of the current shunt -ve feedback amplifier using the above amplifier with a feedback factor of 0.2 is
1/11 kΩ
1/5 kΩ
5 kW
11 kW
Answer: Option
Explanation:

Input Resistance with feedback for current shunt, .

23.
As compared to an ordinary semiconductor diode, a Schottky diode
has lower cut in voltage
has higher cut in voltage
lower reverse saturation current
both (b) and (c)
Answer: Option
Explanation:

Cut in voltage in Schottky diode is about 0.3 V as compared to 0.7 V in ordinary semiconductor diode.

24.

Assertion (A): When a high reverse voltage is applied to a p-n junction the diode breaks down.

Reason (R): High reverse voltage causes Avalanche effect.

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:

Avalanche breakdown occurs at high reverse voltage.

25.
As compared to an ordinary semiconductor diode, a Schottky diode
has higher reverse saturation current
has higher reverse saturation current and higher cut in voltage
has higher reverse saturation current and lower cut in voltage
has lower reverse saturation current and lower cut in voltage
Answer: Option
Explanation:

This is due to high electron concentration in metals.

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