TRANSISTORS,AMPLIFIERS & OSCILLATORS OBJECTIVE
TYPE QUESTIONS BASED ON DIPLOMA LEVEL SYLLABUS FOR THE
DRDO,DMRC,SSC,BHEL,RAILWAYS & OTHER ENGINEERING(DIPLOMA LEVEL)
COMPETITIVE EXAMS
1. The direction of arrow head placed
on the emitter of a transistor
Represents ________________.
a) the direction of motion of
holes b) the direction of motion of electrons
c) both (a) and (b) d) none of
the above
2. The direction
of flow of electrons is ____________ to the direction of motion of holes.
a) same as
b) opposite
3. During normal working of transistor as
amplifier, the emitter diode is ______________.
a) unbiased b) forward biased
c) reverse biased d) none
of the above
4. During normal working of transistor as
amplifier, the collector diode is ______________.
a) unbiased b) forward
biased
c) reverse biased
d) none of the above
5. The reverse current which results in a transistor due to minority
charge carriers
across the collector-to-base junction
is called as ________________.
a) base current b)
emitter current
c) collector current d) collector-to-base leakage current
6. A transistor can be visualized as a
___________ port network.
a) one
b) two
c) three d)
four
7. Varying the input current by varying the
input voltage at constant output voltage
is _____________________.
a) static input characteristics b) static output characteristics
c)
transistor i/o characteristics d) none of the above
8. Varying the output current by varying the
output voltage at constant input current is
_____________________.
a) static input characteristics b) static output characteristics
c) transistor i/o characteristics d) none of the above
9. The ratio of change in collector current to
the change in emitter current at constant collector to
base voltage is ___________.
a)α
b)β
c)γ
d)π
10. The ratio of change in
collector current to the change in base current at constant
collector to emitter voltage is ___________.
a)α
b)β
c)γ
d)π
11. The ratio of change in emitter current
to the change in base is ___________.
a)α
b)β
c)γ
d)π
12. A ______________ circuit has a very high input resistance and very
low output
resistance.
a) common base b)
common emitter
c) common collector
d) none of the above
13. In the saturation region, the emitter-base
& collector-base junctions
are _________________ biased.
a) forward
b) reverse
c) unbiased d)
none of these
14. In the cut-off region, the emitter-base
& collector-base junctions
are _________________ biased.
a) forward
b) reverse
c) unbiased d)
none of these
15. The
intersection of DC load line and the output characteristics of a transistor
called
_____________________.
a) Q–Point b)
quiescent Point
c) operating Point d) all of these
16. The
biasing circuit which gives most stable operating point is _________.
a) base bias b)
collector-to-base bias
c) voltage-divider bias d) none of these
17. The
collector-to-base bias circuit is also known as _______________.
a) base bias b)
voltage-divider bias
c) voltage feedback bias circuit d) none of
these
18. The
reverse saturation current doubles for every _________0C rise in temperature.
a) 40 b) 30
c) 20 d) 10
19. The
reverse saturation current __________ for every 100C
rise in temperature.
a) doubles b) triples
c) quadruples d)
none of these
20. ICBO doubles for every _________0C rise in
temperature.
a) 40 b) 30 c) 20 d) 10
21. ICBO__________ for every 100C rise in temperature.
a) doubles b) triples c) quadruples d) none of these
22. The stability factor ‘S’ is the
rate change of _____________ current with
respect to reverse saturation current.
a) emitter b) base c)
collector d) none of these
23. α is the ratio of change in
__________ current to the change in emitter
current at
constant collector to base voltage.
a) emitter b) base c)
collector d) none of these
24.β is the ratio of change in __________ current to the change in base
current at constant
collector to emitter voltage.
a) emitter
b) base c)
collector d) none of these
25.γ is the ratio of change in
__________ current to the change in base current.
a) emitter b) base c) collector
d) none of these
26. α is the ratio of change in collector current to the change in
_________current at constant
collector to base voltage.
a) emitter b)
base c) collector d) none of these
27. β is the ratio of change in collector current to the change in _________current
at
constant collector to emitter voltage.
a) emitter b) base c) collector d) none of these
28. γ is the ratio of change in emitter current to the change in _________current.
a) emitter b) base c) collector d) none of these
29. The emitter area in a transistor
is considerably __________ than the collector
area.
a) smaller b)
greater c) smaller or greater d) none of these
30. The
collector area is slightly _________ doped than the emitter.
a) more b) less c) more or less d)
none of these
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