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Online Tests
ECAT Physics Chapter 16 Alternating Current Online Test MCQs With Answers
Question # 1
Nowadays, Most of the electric energy is produced by the A.C. generators using:
Choose an answer
Hydal water
Geothermal energy
Solar energy
Biomass
Both (B) and (D)
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Question # 2
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 # 3
In frequency modulation (FM), the carrier waves amplitude
Choose an answer
Remains constant
Increase
Decreases
None of these
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Question # 4
In a normally biased n-p-n transistor, an electron c current I
E
flows from the
Choose an answer
emitter into the base
collector into the base
base into collector
none of these
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Question # 5
The bridge circuit of full wave rectification uses
Choose an answer
one diode
two diode
three diode
four diode
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Question # 6
In a transistor, if the central region is p-type then this type of transistor is known as
Choose an answer
p-n-p transistor
n-p-n transistor
either of these
none of these
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Question # 7
In a transistor, the central region is called
Choose an answer
collector
emitter
base
none of them
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Question # 8
The wave form of alternating voltage is the graph between:
Choose an answer
Voltage across X-axis and time across y-axis
Current and time
Voltage along y-axis and time along x-axis
Voltage and current
Either (B) or (D)
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Question # 9
The entire wave form of sinusoidal voltage is actually a set of all the:
Choose an answer
Positive maximum value + V
o
and negative maximum value -V
o
Posiotive maximum value +V
o
and zero
Zero and negative maximum value -V
o
Any of these
None of these
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Question # 10
Unless stated otherwise, when we speak of A.C. meter reading, we usualy mean:
Choose an answer
Peak value
RMS value
Instantaneous value
Peak-to-peak value
Both (A) and (C0
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Question # 11
Which of the following diodes can operate in the reverse biased condition
Choose an answer
photo diode
light emitting diode
photo voltaic cell
none of these
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Question # 12
The basic circuit element in D.C. circuit is:
Choose an answer
A capacitor
A resistor
An inductor
Both (A) and (C)
Both (A) and (B)
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Question # 13
The closed loop gain of the inverting amplifier is written as
Choose an answer
G = R
2
/R
1
G = 1 + R
2
/R
1
G = -R
2
/R
1
G = 1 - R
2
/R
1
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Question # 14
The magnitude of alternative voltage V:
Choose an answer
Always increase
Always decrease
Remains constant
Does not remain constant
None of these
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Question # 15
Peak value of alternative current is:
Choose an answer
one of its Instantaneous value
Equal to its RMS value
The same as its peak-to-peak value
Both (B) and (C)
None of these
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