Electronics and Communication Engineering - Electronic Devices and Circuits

1.
An increase in junction temperature of a semiconductor diode
causes a small increase in reverse saturation current
causes a large increase in reverse saturation current
does not affect reverse saturation current
may cause an increase or decrease in reverse saturation current depending on rating of diode
Answer: Option
Explanation:

Reverse saturation current doubles for every 10°C rise in junction temperature.


2.
An air gap provided in the iron core of an inductor prevents
flux leakage
hysteresis loss
core saturation
heat generation
Answer: Option
Explanation:
No answer description is available. Let's discuss.

3.
Generally, the gain of a transistor amplifier falls at high frequency due to the
internal capacitance of the device
coupling capacitor at the I/P
skin effect
coupling capacitor at the O/P
Answer: Option
Explanation:
No answer description is available. Let's discuss.

4.
Which of these has a layer of intrinsic semiconductor?
Zener diode
PIN diode
Photo diode
Schottky diode
Answer: Option
Explanation:

The intrinsic layer is in between p and n layers.


5.

Assertion (A): When Diode used as rectifier the reverse breakdown voltage should not be exceeded.

Reason (R): A high inverse voltage can destroy a p-n junction.

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:

PIV is an important parameter in rectifier operation.