Semiconductors - General Questions (3)

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Semiconductors - General Questions

17.

In a parallel resonant circuit, the circuit current at resonance is maximum.

A.	True
B.	False

Answer: Option B

Explanation:

In parallel resonance current is minimum.

18.

The term bias in electronics usually means

A.	the value of ac voltage in the signal.
B.	the condition of current through a pn junction.
C.	the value of dc voltages for the device to operate properly.
D.	the status of the diode.

Answer: Option C

Explanation:

No answer description available for this question

19.

A silicon diode is forward-biased. You measure the voltage to ground from the anode at ________, and the voltage from the cathode to ground at ________.

A.	0 V, 0.3 V
B.	2.3 V, 1.6 V
C.	1.6 V, 2.3 V
D.	0.3 V, 0 V

Answer: Option B

Explanation:

For silicon diodes, the built-in potential is approximately 0.7 V. Thus, if an external current is passed through the diode, about 0.7 V will be developed across the diode such that the P-doped region is positive with respect to the N-doped region and the diode is said to be "turned on" as it has a forward bias.

Therefore, 2.3 V - 1.6 V = 0.7 V. Hence the answer is correct.

20.

The maximum number of electrons in each shell of an atom is

A.	2.
B.	2n2 where n is the number of the shell.
C.	4.
D.	8.

Answer: Option B

Explanation:

No answer description available for this question

21.

What occurs when a conduction-band electron loses energy and falls back into a hole in the valence band?

A.	doping
B.	recombination
C.	generation

Answer: Option B

Explanation:

No answer description available for this question

22.

The most common type of diode failure is a(n) ________.

A.	open
B.	short
C.	resistive

Answer: Option A

Explanation:

No answer description available for this question

23.

The forward voltage across a conducting silicon diode is about

A.	0.3 V.
B.	1.7 V.
C.	â€“0.7 V.
D.	0.7 V.

Answer: Option D

Explanation:

No answer description available for this question

24.

Doping of a semiconductor material means

A.	that a glue-type substance is added to hold the material together.
B.	that impurities are added to increase the resistance of the material.
C.	that impurities are added to decrease the resistance of the material.
D.	that all impurities are removed to get pure silicon.

Answer: Option C

Explanation:

No answer description available for this question

Semiconductors - General Questions (3)

Semiconductors - General Questions

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