Q. In a transmission line, what does the term 'surge impedance' refer to?
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A.
The resistance to current flow
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B.
The characteristic impedance of the line
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C.
The maximum voltage the line can handle
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D.
The power factor of the line
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 does the term 'load flow' analysis help determine in a transmission system?
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A.
The efficiency of transformers
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B.
The voltage drop across the line
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C.
The optimal routing of power
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D.
The maximum load capacity
Solution
Load flow analysis helps determine the voltage drop across the transmission line under various load conditions.
Correct Answer:
B
— The voltage drop across the line
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Q. What is the effect of increasing the transmission line length on its resistance?
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A.
Resistance decreases
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B.
Resistance remains constant
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C.
Resistance increases
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D.
Resistance fluctuates
Solution
As the length of the transmission line increases, its resistance also increases proportionally.
Correct Answer:
C
— Resistance increases
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Q. What is the primary function of a transmission line's insulator?
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A.
To support the line
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B.
To prevent electrical leakage
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C.
To reduce line losses
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D.
To increase line capacity
Solution
Insulators are used to support the transmission line and prevent electrical leakage to the ground.
Correct Answer:
B
— To prevent electrical leakage
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Q. What is the primary role of a circuit breaker in a transmission line?
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A.
To regulate voltage
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B.
To protect the line from overloads
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C.
To increase transmission capacity
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D.
To convert AC to DC
Solution
Circuit breakers are designed to protect the transmission line from overloads and short circuits by interrupting the current flow.
Correct Answer:
B
— To protect the line from overloads
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Q. What is the purpose of a transmission line's right-of-way?
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A.
To allow for maintenance access
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B.
To prevent vegetation growth
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C.
To ensure safety from electrical hazards
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D.
All of the above
Solution
The right-of-way is essential for maintenance access, preventing vegetation growth, and ensuring safety from electrical hazards.
Correct Answer:
D
— All of the above
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Q. Which component is essential for switching operations in a transmission line?
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A.
Transformer
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B.
Circuit breaker
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C.
Capacitor
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D.
Inductor
Solution
Circuit breakers are essential for switching operations, allowing for the safe disconnection of lines.
Correct Answer:
B
— Circuit breaker
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Q. Which of the following factors does NOT affect the performance of a transmission line?
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A.
Line length
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B.
Voltage level
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C.
Weather conditions
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D.
Type of transformer used
Solution
The type of transformer used does not directly affect the performance of the transmission line itself.
Correct Answer:
D
— Type of transformer used
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Q. Which phenomenon can cause voltage instability in a transmission line?
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A.
Load shedding
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B.
Reactive power flow
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C.
Overhead line sag
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D.
Insulator failure
Solution
Reactive power flow can lead to voltage instability, especially under varying load conditions.
Correct Answer:
B
— Reactive power flow
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Q. Which type of fault is most common in transmission lines?
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A.
Single line-to-ground fault
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B.
Three-phase fault
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C.
Line-to-line fault
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D.
Double line-to-ground fault
Solution
Single line-to-ground faults are the most common type of fault in transmission lines due to insulation failure or external factors.
Correct Answer:
A
— Single line-to-ground fault
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