MCQ
41. When transistor is used as an amplifier, it is operated in the:
Cut off region
Saturation region
Active region
Both a and b
42. Emitter follower is used for--
Impedance matching
Current gain
Voltage gain
None of the above
43. If, line frequency is 50 Hz, then output (Hz) of a bridge rectifier is-
25
100
50
None
Himalay Sen Sir
ইলেক্ট্রিক্যাল ডিপার্টমেন্ট Mcq
EEE MCQ
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ব্যাখ্যা: ব্যাখ্যা: Output frequency of bridge rectifier is twice the input frequency. Full wave bridge rectifier, 25,2x50=100H
44. In an LC oscillator, the frequency of oscillation is:
Proportional to LC
Proportional to square root of LC
Inversely proportional to the square root of LC
Independent of the value of LC
45. A pn junction acts as a-
unidirectional switch.
bidirecctional switch.
controlled switch.
both unidirectional and bidirectional.
Himalay Sen Sir
ইলেক্ট্রিক্যাল ডিপার্টমেন্ট Mcq
EEE MCQ
Electrical Department all question
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ব্যাখ্যা: ব্যাখ্যা : The PN junction is conduct with forward bias only. It means they conduct in only one direction (Current flows from P to N). That's why PN Junction acts as unidirectional switch.
46. The most commonly used semiconductor is-
germanium
carbon
sulphur
silicon
47. Class-B power amplifier- miximum collector efficiency কত %
25
78.5
50
60
48. If a power supply has no-load and full-load voltages of 30V and 25V respectively, then the percentage voltage regulation is:
10%
20%
15%
25%
49. Transistor biasing represents --conditions.
ac
both ac & dc
dc
none
50. RC coupling is used for---amplification.
voltage
power
current
none
51. What is the full name of LCD?
Light control diode .
Light crystal display.
Liquid crystal diode.
Liquid crystal display.
52. Process of adding impurities to semiconductor is called-
mixing
refining
diffusing
doping
Himalay Sen Sir
ইলেক্ট্রিক্যাল ডিপার্টমেন্ট Mcq
EEE MCQ
Electrical Department all question
বেসিক ইলেক্ট্রনিক্স all mcq
Besic electronics mcq
ব্যাখ্যা: ব্যাখ্যা: The process of adding controlled inpurities to a semiconductor is known as "doping" The amount of impurity, or dopant, added to as intrinsic (pure) semiconductor varies its level of conductivity.
53. Which one is the smallest region in a transistor?
base
collector
emitter
both (a) and (b)
Himalay Sen Sir
ইলেক্ট্রিক্যাল ডিপার্টমেন্ট Mcq
EEE MCQ
Electrical Department all question
বেসিক ইলেক্ট্রনিক্স all mcq
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ব্যাখ্যা: ব্যাখ্যা: The base region of a BJT transistor is very thin and is lightly doped with current carries. It is the region of a transistor which has opposite polarity charge carries from the emitter and the collector regions.
54. At what relgon a transistor operates --
Artlive
Saturatioit
Cut off
None
55. For highest power gain, one would use-- configuration.
CE
CB
CC
none of these
Himalay Sen Sir
ইলেক্ট্রিক্যাল ডিপার্টমেন্ট Mcq
EEE MCQ
Electrical Department all question
বেসিক ইলেক্ট্রনিক্স all mcq
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ব্যাখ্যা: ব্যাখ্যা: For highest power gain, CE configuration is used. In CE configuration, biasing capacitor is used to balance the operating point to obtain highest power gain
56. Half-wave rectifier- maximum efficiency--%
25
50
40.6
81.2
57. A PN junction acts as a--
unidirectional switch
bidirectional switch
controlled switch
none of the above
Himalay Sen Sir
ইলেক্ট্রিক্যাল ডিপার্টমেন্ট Mcq
EEE MCQ
Electrical Department all question
বেসিক ইলেক্ট্রনিক্স all mcq
Besic electronics mcq
ব্যাখ্যা: ব্যাখ্যা: The PN junction is conduct with forward bias only. It means they conduct in only one direction (Current flows from P to N) That's why PN Junction acts as unidirectional twitch
58. The maximum efficiency of a half-wave diode rectifier is --
50%
25%
40.0%
81.2%
59. When there is no forbidden region between the conductance band and valence band, the substance is called:
Semiconductor.
conductor
superconductor
insulator
60. The point of intersection of de and ac load lines is called-
saturation
operating
cut off
none of these