Semiconductor Electronics: Materials, Devices And Simple Circuits
15 Questions
| Attempts: 1211
Time: 30 Minute
Questions and Answers
- 1.What is the possible number of crystal system?
- A.
5
- B.
7
- C.
14
- D.
16
- 2.With fall of temperature, the forbidden energy gap of a semiconductor:
- A.
Increases
- B.
Decreases
- C.
Remains unchanged
- D.
Sometimes increases and sometimes decreases
- 3.What would be the fundamental frequency in the ripple, if a half wave rectifier circuit is being operated from a 50 Hz mains frequency?
- A.
25 Hz
- B.
50 Hz
- C.
70.7 Hz
- D.
100 Hz
- 4.At absolute zero, Si acts as a:
- A.
Non - metal
- B.
Metal
- C.
Insulator
- D.
None of these
- 5.
What is the equivalent resistance of the circuit across AB?- A.
4 Ω
- B.
13 Ω
- C.
4 Ω or 13 Ω
- D.
4 Ω or 0 Ω
- 6.
The graph shown represents the I – V characteristics of a Zener diode. Which part according to you operates as a voltage regulator?
- A.
Ab
- B.
Bc
- C.
Cd
- D.
De
- 7.For a transistor if the parameters β = 99, then the value of parameter α is:
- A.
0.9
- B.
0.99
- C.
1
- D.
9
- 8.In the ratio of concentration of electrons that of holes in a semiconductor is 7/5 and the ratio of currents is 7/4 then what is the ratio of their drift velocity?
- A.
4/7
- B.
5/8
- C.
4/5
- D.
5/4
- 9.
What will be the output voltage of the amplifier, if in an npn transistor at common emitter configuration the current gain is given as β = 100.
- A.
10-3 V
- B.
10-1 V
- C.
100 V
- D.
10 V
- 10.
In the given figure, the current through the Zener diode is:
- A.
10 mA
- B.
6.67 mA
- C.
5 mA
- D.
3.33 mA
- 11.The relation between α and β parameters of a transistor is given by:
- A.
![Semiconductor Electronics: Materials, Devices And Simple Circuits - Quiz]()
- B.
![Semiconductor Electronics: Materials, Devices And Simple Circuits - Quiz]()
- C.
![Semiconductor Electronics: Materials, Devices And Simple Circuits - Quiz]()
- D.
![Semiconductor Electronics: Materials, Devices And Simple Circuits - Quiz]()
- 12.
In the figure of the circuit the output y becomes zero for the inputs:
- A.
A = 1, B = 0, C = 0
- B.
A = 0, B = 1, C = 1
- C.
A = 0, B = 0, C = 0
- D.
A = 1, B = 1, C = 0
- 13.
The figure shows a logic gate circuit with two inputs A and B and the output Y. The voltage waveforms of A, B and Y are given: The logic gate is:
- A.
NAND Gate
- B.
OR Gate
- C.
AND Gate
- D.
NOR Gate
- 14.
The circuit diagram shows a logic combination with the states of outputs X, Y and Z given for inputs P, Q, R and S all at state 1. When input P and R change to state 0 with inputs Q and S still at 1, the states of outputs X, Y and Z change to:
- A.
1, 0, 0
- B.
0, 1, 0
- C.
0, 0, 1
- D.
0, 1, 1
- 15.
Two ideal diodes are connected to a battery as shown in the figure. The current supplied by the battery is:
- A.
0.75 A
- B.
Zero
- C.
0.25 A
- D.
0.5 A
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