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বেসিক ইলেকট্রনিক্স MCQ
ইলেকট্রনিক্স ডিপার্টমেন্টের বেসিক ইলেকট্রনিক্স সাবজেক্টের সকল MCQ প্রশ্ন এই ফোল্ডারে পাবেন। ইলেকট্রনিক্স ইঞ্জিনিয়ারিং এ চাকরি প্রস্তুতির জন্য ডিপার্টমেন্ট ও নন-ডিপার্টমেন্টের সকল MCQ ও আপডেট প্রশ্ন উত্তর সহ এই গ্রুপে পাবেন। ইঞ্জিনিয়ারিং চাকরি প্রস্তুতির জন্য আমাদের App: Engineering Classroom গুগল প্লে-স্টোর থেকে ডাউনলোড করে নিন।
41. Process of adding impurities to semiconductor is called-
mixing
refining
diffusing
doping
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.
42. RC coupling is used for---amplification.
voltage
power
current
none
43. Emitter follower is used for--
Impedance matching
Current gain
Voltage gain
None of the above
44. A PN junction acts as a--
unidirectional switch
bidirectional switch
controlled switch
none of the above
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
45. The maximum efficiency of a half-wave diode rectifier is --
50%
25%
40.0%
81.2%
46. For highest power gain, one would use-- configuration.
CE
CB
CC
none of these
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
47. Class-B power amplifier- miximum collector efficiency কত %
25
78.5
50
60
48. At what relgon a transistor operates --
Artlive
Saturatioit
Cut off
None
49. Which one is the smallest region in a transistor?
base
collector
emitter
both (a) and (b)
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.
50. Half-wave rectifier- maximum efficiency--%
25
50
40.6
81.2
51. What is the full name of LCD?
Light control diode .
Light crystal display.
Liquid crystal diode.
Liquid crystal display.
52. The most commonly used semiconductor is-
germanium
carbon
sulphur
silicon
53. When there is no forbidden region between the conductance band and valence band, the substance is called:
Semiconductor.
conductor
superconductor
insulator
54. A pn junction acts as a-
unidirectional switch.
bidirecctional switch.
controlled switch.
both unidirectional and bidirectional.
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.
55. 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%
56. The point of intersection of de and ac load lines is called-
saturation
operating
cut off
none of these
57. Transistor biasing represents --conditions.
ac
both ac & dc
dc
none
58. If, line frequency is 50 Hz, then output (Hz) of a bridge rectifier is-
25
100
50
None
ব্যাখ্যা: Output frequency of bridge rectifier is twice the input frequency. Full wave bridge rectifier, 25,2x50=100H
59. When transistor is used as an amplifier, it is operated in the:
Cut off region
Saturation region
Active region
Both a and b
60. An alternating current is converted to direct current by-
dynamo
rectifier
transformer
motor
ব্যাখ্যা: A rectifier is a device which converts ac (alternating current) to de (direct current) which flows in only one direction. This process is know as rectification.