91
In a forward biased pn junction diode, the sequence of events that best describes the mechanism of current flow is
A)
Injection, and subsequent diffusion and recombination of minority carriers
B)
Injection, and subsequent drift and generation of minority carriers
C)
Extraction, and subsequent diffusion and generation of minority carriers
D)
Extraction, and subsequent drift and recombination of minority carriers
Answer & Solution
Answer: Option
A
92
Electron mobility of the following intrinsic elements in descending order is:
A)
GaAs, Ge, Si
B)
GaAs, Si, Ge
C)
Si, Ge, GaAs
D)
Ge, Si, GaAs
Answer & Solution
Answer: Option
A
93
The Darlington pair is mainly used for
A)
Impedance matching
B)
Wideband voltage amplification
C)
Power amplification
D)
Reducing distortion
Answer & Solution
Answer: Option
A
94
The diffusion capacitance of a p-n junction diode
A)
Increases exponentially with forward bias voltage
B)
Decreases exponentially with forward bias voltage
C)
Decreases exponentially with forward bias voltage
D)
Increases linearly with forward bias voltage
Answer & Solution
Answer: Option
A
95
"Common Base" configuration refers to the configuration of a-
A)
Rectifier
B)
Transistor
C)
Diode
D)
Inverter
Answer & Solution
Answer: Option
B
96
If the common base DC current gain of a BJT is 0.98, its common emitter DC current gain is
A)
51
B)
49
C)
1
D)
0.02
Answer & Solution
Answer: Option
B
97
An n-type semiconductor is . . . . . . . .
A)
Positively charged
B)
Negatively charged
C)
Electrically neutral
D)
None of the above
Answer & Solution
Answer: Option
C
98
Match items in
List-I with items in
List-II most suitable.
List-I List-II
a. LED
1. Heavy doping
b. Avalanche Photodiode
2. Coherent radiation
c. Tunnel diode
3. Spontaneous emission
d. LASER
4. Current gain
A)
a-1, b-2, c-4, d-3
B)
a-2, b-3, c-1, d-4
C)
a-3, b-4, c-1, d-2
D)
a-2, b-1, c-4, d-3
Answer & Solution
Answer: Option
C
A)
Directed movement of charged particles under the application of electric field
B)
directed movement of charged particles due to concentration gradient
C)
random movement of charged particles due to thermal energy
D)
None of the above
Answer & Solution
Answer: Option
A
100
If f(E) is Fermi dirac distribution function then 1-f(E) is the probability:f is Fermi level)
A)
That a state is empty below Ef
B)
That a state is filled below Ef
C)
That a state is empty above Ef
D)
That a state is filled above Ef
Answer & Solution
Answer: Option
A
