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Free download in PDF Transistor Biasing Objective Type Questions and Answers for competitive exams. These short objective type questions with answers are very important for Board exams as well as competitive exams. These short solved questions or quizzes are provided by Gkseries.
(21)
In voltage divider bias, operating point is 3 V, 2 mA. If VCC = 9 V, RC = 2.2 kO, what is the value of RE ?
[A]
2000 O
[B]
1400 O
[C]
800 O
[D]
1600 O
(22)
In the above question (Q38.) , what is the collector voltage?
[A]
3 V
[B]
8 V
[C]
6 V
[D]
7 V
(23)
In voltage divider bias, VCC = 25 V; R1 = 10 kO; R2 = 2.2 V ; RC = 3.6 V and RE =1 kO. What is the emitter voltage?
[A]
7 V
[B]
3 V
[C]
8 V
[D]
None of these
(24)
A silicon transistor is biased with base resistor method. If ß=100, VBE =0.7 V, zero signal collector current IC = 1 mA and VCC = 6V , what is the value of the base resistor RB?
[A]
105 kO
[B]
530 kO
[C]
315 kO
[D]
None of the above
(25)
In a particular biasing circuit, the value of RE is about ………
[A]
10 kO
[B]
1 MO
[C]
100 kO
[D]
800 O
(26)
The value of stability factor for a base resistor bias is …………
[A]
RB (ß+1)
[B]
(ß+1)RC
[C]
(ß+1)
[D]
1-ß
(27)
When the temperature changes, the operating point is shifted due to …….
[A]
Change in ICBO
[B]
Change in VCC
[C]
Change in the values of circuit resistance
[D]
None of the above
(28)
The value of VBE …………….
[A]
Depends upon IC to moderate extent
[B]
Is almost independent of IC
[C]
Is strongly dependant on IC
[D]
None of the above
Answer: Is almost independent of IC
(29)
The stabilisation of operating point in potential divider method is provided by ……….
[A]
RE consideration
[B]
RC consideration
[C]
VCC consideration
[D]
None of the above
(30)
If the temperature increases, the value of VCE …………
[A]
Remains the same
[B]
Is increased
[C]
Is decreased
[D]
None of the above
31
If the value of collector current IC increases, then the value of VCE …………
[A]
Remains the same
[B]
Decreases
[C]
Increases
[D]
None of the above
32
In the design of a biasing circuit, the value of collector load RC is determined by …………
[A]
VCE consideration
[B]
VBE consideration
[C]
IB consideration
[D]
None of the above
Answer: VCE consideration
33
The stability factor of a collector feedback bias circuit is ……….. that of base resistor bias.
[A]
The same as
[B]
More than
[C]
Less than
[D]
None of the above
34
In a base resistor method, if the value of ß changes by 50, then collector current will change by a factor ………
[A]
25
[B]
50
[C]
100
[D]
None of these
35
For germanium transistor amplifier, VCE should ………….. for faithful amplification
[A]
Be zero
[B]
Be 0.2 V
[C]
Not fall below 0.7 V
[D]
None of the above
Answer: 2.5 times the rated value
36
The base resistor method is generally used in ………
[A]
Amplifier circuits
[B]
Switching circuits
[C]
Rectifier circuits
[D]
None of the above
Answer: Switching circuits
37
In a transistor amplifier circuit VCE = VCB + ……………..
[A]
VBE
[B]
2VBE
[C]
5 VBE
[D]
None of the above
38
The purpose of resistance in the emitter circuit of a transistor amplifier is to ………….
[A]
Limit the maximum emitter current
[B]
Provide base-emitter bias
[C]
Limit the change in emitter current
[D]
None of the above
Answer: Limit the change in emitter current
39
Thermal runaway occurs when ……….
[A]
Collector is reverse biased
[B]
Transistor is not biased
[C]
Emitter is forward biased
[D]
Junction capacitance is high
Answer: Transistor is not biased
40
The disadvantage of voltage divider bias is that it has ………….
[A]
High stability factor
[B]
Low base current
[C]
Many resistors
[D]
None of the above
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