Q. In a long transmission line, which model is commonly used for analysis?
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A.
Short line model
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B.
Medium line model
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C.
Long line model
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D.
Transformer model
Solution
The long line model is used for transmission lines that are long enough to require consideration of distributed parameters.
Correct Answer:
C
— Long line model
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Q. In transmission line analysis, what does the term 'load flow' refer to?
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A.
The flow of electrical load
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B.
The analysis of power distribution
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C.
The calculation of voltage and current in the system
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D.
The flow of reactive power
Solution
Load flow refers to the analysis of power distribution in the system, determining voltage, current, and power at various points.
Correct Answer:
C
— The calculation of voltage and current in the system
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Q. What does the term 'surge impedance' refer to in transmission lines?
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A.
The impedance at which power is maximized
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B.
The characteristic impedance of the line
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C.
The impedance due to load
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D.
The impedance of transformers
Solution
Surge impedance refers to the characteristic impedance of the transmission line, which affects wave propagation.
Correct Answer:
B
— The characteristic impedance of the line
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Q. What is the effect of increasing the transmission line length on the voltage drop?
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A.
Voltage drop decreases
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B.
Voltage drop remains constant
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C.
Voltage drop increases
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D.
Voltage drop becomes negligible
Solution
As the transmission line length increases, the voltage drop also increases due to the resistance and reactance of the line.
Correct Answer:
C
— Voltage drop increases
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Q. What is the primary cause of corona discharge in transmission lines?
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A.
High voltage
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B.
Low humidity
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C.
High temperature
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D.
Insulation failure
Solution
Corona discharge primarily occurs due to high voltage, which ionizes the air around the conductors.
Correct Answer:
A
— High voltage
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Q. What is the primary function of a transmission line's reactance?
-
A.
To store energy
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B.
To limit current flow
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C.
To provide voltage regulation
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D.
To reduce losses
Solution
The reactance of a transmission line primarily serves to store energy in the magnetic field, affecting the current flow.
Correct Answer:
B
— To limit current flow
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Q. What is the primary purpose of a transmission line?
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A.
To generate electricity
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B.
To distribute electricity to consumers
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C.
To transmit electricity over long distances
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D.
To convert AC to DC
Solution
The primary purpose of a transmission line is to transmit electricity over long distances from generation sources to substations.
Correct Answer:
C
— To transmit electricity over long distances
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Q. What is the primary purpose of using a transformer in a transmission system?
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A.
To increase voltage for transmission
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B.
To decrease voltage for distribution
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C.
To isolate sections of the network
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D.
All of the above
Solution
Transformers are used to increase voltage for efficient transmission and decrease voltage for safe distribution, among other purposes.
Correct Answer:
D
— All of the above
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Q. What is the significance of the 'critical voltage' in transmission line analysis?
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A.
It indicates the maximum load capacity
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B.
It is the voltage at which the line becomes unstable
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C.
It is the minimum voltage for operation
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D.
It is the voltage drop across the line
Solution
The critical voltage is significant as it indicates the voltage level at which the transmission line may become unstable under certain conditions.
Correct Answer:
B
— It is the voltage at which the line becomes unstable
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Q. Which of the following is a common method for protecting transmission lines?
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A.
Fuses
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B.
Circuit breakers
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C.
Relays
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D.
All of the above
Solution
All of the above methods are commonly used for protecting transmission lines from faults.
Correct Answer:
D
— All of the above
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Q. Which of the following parameters is NOT typically considered in transmission line analysis?
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A.
Resistance
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B.
Inductance
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C.
Capacitance
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D.
Voltage regulation
Solution
Voltage regulation is an outcome of transmission line analysis, not a parameter typically considered in the analysis itself.
Correct Answer:
D
— Voltage regulation
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Q. Which type of transmission line configuration is most commonly used for high voltage transmission?
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A.
Single-phase
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B.
Two-phase
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C.
Three-phase
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D.
Multi-phase
Solution
Three-phase transmission line configurations are most commonly used for high voltage transmission due to their efficiency and balance.
Correct Answer:
C
— Three-phase
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