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ECAT Physics Chapter 16 Alternating Current Online Test MCQs With Answers
Question # 1
Conversion of alternating current into direct current is called
Choose an answer
amplification
rectification
conduction
polarization
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Question # 2
Alternating current can induce voltage because it has a
Choose an answer
High peak value
Varying magnetic field
Stronger field than direct curren
Constant magnetic field
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Question # 3
For the normal operation of the transistor, its
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emitter-base and collector base junctions are forward biased
emitter-base junction is reversed biased and collector base junction is forward biased
emitter-base junction is forward biased and collector-base junction is reverse biased
any one of these
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Question # 4
The bridge circuit of full wave rectification uses
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one diode
two diode
three diode
four diode
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Question # 5
In a transistor, the central region is called
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collector
emitter
base
none of them
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Question # 6
The value of current gain of n-p-n transistor is of the order of
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tens
hundreds
thousands
ten thousands
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Question # 7
A diode characteristic curve is a plot between
Choose an answer
current and time
voltage and time
voltage and current
forward voltage and reversed voltage
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Question # 8
The impedance of RLC series resonance circuit at resonant frequency is
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Greater than R
Equal to R
Less than R
None of these
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Question # 9
A P-N juction or semiconductor diode cannot be used as
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A rectifier
Detector
Oscillator
An amplifier
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Question # 10
The phase angle of a series RLC circuit at resonance is
Choose an answer
180
°
90
°
0
°
None of the these
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Question # 11
Alternating current can be transmitted:
Choose an answer
To long distance
At very high cost
At very low cost
Both (A) and (C)
Both (A) and (B)
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Question # 12
The Instantaneous value of alternative current maybe:
Choose an answer
The same as its RMS value
Greater than its Rms value
The same as its peak value
Any of these
None of these
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Question # 13
Unless stated otherwise, when we speak of A.C. meter reading, we usualy mean:
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Peak value
RMS value
Instantaneous value
Peak-to-peak value
Both (A) and (C0
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Question # 14
The highest value reached by the voltage or current:
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In quarter cycle is called Instantaneous value
In half cycle is called peak-to-peak value
In one cycle is called peak value
In half cycle is called Instantaneous value
None of these
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Question # 15
If 250V is the RMS value of alternative voltage, then its peak value V
o
will be:
Choose an answer
353.5V
250V
175V
zero
400V
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Question # 16
For normal operation of transistor, the batteries
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V
CC
is of much lower value than V
BB
V
CC
is of much higher value than V
BB
V
CC is equal to
V
BB
none of these
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