1. The reverse current of a silicon diode is ?

Both bias voltage and temperature sensitive

Highly bias voltage sensitive

Highly temperature sensitive

Independent of bias voltage and temperature

Answer: Highly temperature sensitive

Explanation:


2. The ac resistance of a forward-biased p-n junction diode operating at a bias voltage 'V' and carrying current 'I' is ?

?V/?I

zero

a constant value independent of V and I

V/I

Answer: ?V/?I

Explanation:


3. Silicon devices are preferred at high temperature operations comparison to germanium because ?

silicon can dissipate more power

reverse saturation current is less in case of silicon

silicon is more thermally stable

none of the above

Answer: reverse saturation current is less in case of silicon

Explanation:


4. As the temperature is increased, the voltage across a diode carrying a constant current ?

remains constant

increases

decreases

may increase or decrease depending on the doping levels in the junction

Answer: decreases

Explanation:


5. What is the typical value for the ratio of current in a p-n junction diode in the forward bias and that in the reverse bias ?

1

10

100

1000

Answer: 1000

Explanation:


6. A p-n junction diode's dynamic conductance is directly proportional to ?

the applied voltage

its current

the temperature

the thermal voltage

Answer: its current

Explanation:


7. The voltage stability with time of reference diodes incorporating Zener diodes is comparable to that of which of the following ?

Dry cells

Conventional standard cells

Nickel-cadmium cells

Lead-acid accumulator batteries

Answer: Lead-acid accumulator batteries

Explanation:


8. In a tunnel diode, the width of the depletion layer is of the order of ?

1.0 micron

0.1 micron

100 armstrong

0.1 armstrong

Answer: 100 armstrong

Explanation:


9. The negative resistance in a tunnel diode ?

is maximum at the valley point

is maximum at the peak point of the characteristic

may be improved by the use of reverse bias

is available between the peak and valley points

Answer: is available between the peak and valley points

Explanation:


10. A PIN diode is frequently used as a ?

switching diode for frequencies up to GHz range

peak clipper

voltage regulator

harmonic generator

Answer: switching diode for frequencies up to GHz range

Explanation: