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Electrical Engineering
Circuit Theorems In Ac Analysis
Quiz 1
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Q.1
Norton's theorem gives
An equivalent current source in parallel with an equivalent impedance
An equivalent current source in series with an equivalent impedance
An equivalent voltage source in parallel with an equivalent impedance
An equivalent voltage source in series with an equivalent impedance
Q.2
The Norton equivalent current is
The current through the load
The open-current from the source
The short circuit current
None of the above
Q.3
Norton's theorem provides a method for the reduction of any ac circuit to an equivalent form consisting of an equivalent voltage source in series with an equivalent impedance.
True
False
Q.4
Thevenin's theorem provides a method for the reduction of any ac circuit to an equivalent form consisting of an equivalent current source in parallel with an equivalent impedance.
True
False
Q.5
The Thevenin equivalent voltage is
Equal to the source voltage
The same as the load voltage
The open circuit voltage
None of the above
Q.6
The superposition theorem is useful for circuit analysis only in ac circuits.
True
False
Q.7
In order to get maximum power transfer from a capacitive source, the load must
Have a capacitive reactance equal to circuit resistance
Have an impedance that is the complex conjugate of the source impedance
Be as capacitive as it is inductive
None of the above
Q.8
In order to get maximum power transfer from a capacitive source, the load must have an impedance that is the complex conjugate of the source impedance.
True
False
Q.9
An equivalent circuit is one that produces the same voltage and current to a given load as the original circuit that it replaces.
True
False
Q.10
Like Thevenin's theorem, Norton's theorem provides a method of reducing a more complex circuit to a simpler, more manageable form for analysis.
True
False
Q.11
The superposition theorem is useful for the analysis of single-source circuits.
True
False
Q.12
If two currents are in the same direction at any instant of time in a given branch of a circuit, the net current at that instant
Is zero
Is the sum of the two currents
Is the difference between the two currents
Cannot be determined
Q.13
In applying the superposition theorem,
The sources are considered one at a time with all others replaced by their internal impedance
All sources are considered independently
All sources are considered simultaneously
The sources are considered one at a time with all others replaced by their internal resistance
Q.14
A Thevenin ac equivalent circuit always consists of an equivalent ac voltage source and an equivalent capacitance.
True
False
Q.15
In an ac circuit, power to the load peaks at the frequency at which the load impedance is the complex conjugate of the output impedance.
True
False
Q.16
Referring to the given circuit, find Z
TH
for the part of the circuit that is external to RL.
129 ∠21.4° Ω
43.7 ∠68.6° Ω
43.7 ∠21.4° Ω
12.9 ∠68.6° Ω
Q.17
For the circuit shown, determine Z
TH
for the portion of the circuit external to RL.
66.7 ∠-33.7° kΩ
6.67 ∠-333.7° kΩ
14.4 ∠-56.3° kΩ
1.44 ∠-33.7° kΩ
Q.18
Referring to the given circuit, how much power, in watts, is delivered to the speaker at the determined frequency if VS = 4.5 VRMS?
226 mW
2.26 mW
4.24 mW
424 mW
Q.19
Referring to the given circuit, what is Z
TH
if R1 is changed to 220 Ω?
225 ∠12.1° Ω
225 ∠77.9° Ω
46 ∠77.9° Ω
46 ∠12.1° Ω
Q.20
Determine V
TH
if R1 is changed to 3.3 kΩ.
0.574 ∠16.7° V
4.63 ∠16.7° V
4.63 ∠39.5° V
0.463 ∠39.5° V
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