Q. What does the term 'line loading' refer to?
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A.
The amount of power a line can carry
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B.
The physical weight of the conductors
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C.
The thermal capacity of the line
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D.
The voltage drop along the line
Solution
Line loading refers to the amount of electrical power that a transmission line can safely carry.
Correct Answer:
A
— The amount of power a line can carry
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Q. What does the term 'load flow' refer to in power systems?
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A.
The flow of energy from generation to consumption
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B.
The flow of reactive power only
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C.
The flow of energy in a single transmission line
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D.
The flow of energy during peak demand
Solution
Load flow analysis studies the flow of electrical power in a system from generation to consumption under various conditions.
Correct Answer:
A
— The flow of energy from generation to consumption
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Q. What is the main advantage of using high voltage for transmission?
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A.
Increased current flow
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B.
Reduced power losses
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C.
Simplified infrastructure
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D.
Lower insulation requirements
Solution
Using high voltage reduces current flow for the same power level, which in turn reduces resistive power losses in the transmission line.
Correct Answer:
B
— Reduced power losses
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Q. What is the primary function of a transformer in a transmission system?
-
A.
To increase voltage for transmission
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B.
To decrease voltage for distribution
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C.
To convert AC to DC
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D.
To store energy
Solution
Transformers are used to increase voltage levels for efficient transmission over long distances.
Correct Answer:
A
— To increase voltage for transmission
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Q. What is the primary purpose of protective relays in transmission systems?
-
A.
To monitor voltage levels
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B.
To disconnect faulty sections
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C.
To regulate power flow
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D.
To enhance transmission efficiency
Solution
Protective relays are designed to detect faults and disconnect faulty sections of the transmission system to prevent damage.
Correct Answer:
B
— To disconnect faulty sections
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Q. What is the purpose of a switchgear in a transmission system?
-
A.
To generate electricity
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B.
To control and protect electrical equipment
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C.
To convert AC to DC
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D.
To store energy
Solution
Switchgear is used to control, protect, and isolate electrical equipment in a transmission system.
Correct Answer:
B
— To control and protect electrical equipment
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Q. What is the purpose of a transmission line's insulator?
-
A.
To support the conductor
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B.
To increase the voltage
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C.
To reduce power losses
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D.
To protect against short circuits
Solution
Insulators are used to support the conductor and prevent electrical current from leaking to the ground.
Correct Answer:
A
— To support the conductor
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Q. What is the significance of the 'surge impedance' of a transmission line?
-
A.
It determines the maximum voltage
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B.
It affects the line's power factor
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C.
It influences the reflection of waves
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D.
It indicates the thermal limits
Solution
Surge impedance is significant as it influences the reflection of electrical waves along the transmission line.
Correct Answer:
C
— It influences the reflection of waves
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Q. What is the term for the reactive power flow in a transmission line?
-
A.
Active power
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B.
Apparent power
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C.
Reactive power
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D.
Real power
Solution
Reactive power is the component of power that oscillates between the source and load, affecting voltage levels in the transmission line.
Correct Answer:
C
— Reactive power
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Q. What is the typical voltage level for high voltage transmission lines?
-
A.
110 kV
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B.
400 kV
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C.
1 kV
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D.
10 kV
Solution
High voltage transmission lines typically operate at voltages of 110 kV and above, with 400 kV being common in many regions.
Correct Answer:
B
— 400 kV
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Q. Which component is used to protect transmission lines from overcurrent?
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A.
Circuit breaker
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B.
Transformer
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C.
Capacitor bank
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D.
Inductor
Solution
Circuit breakers are used to protect transmission lines from overcurrent conditions by interrupting the flow of electricity.
Correct Answer:
A
— Circuit breaker
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Q. Which of the following factors does NOT affect the resistance of a transmission line?
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A.
Material of the conductor
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B.
Length of the line
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C.
Temperature of the environment
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D.
Voltage level of the line
Solution
The resistance of a transmission line is affected by the material, length, and temperature, but not by the voltage level.
Correct Answer:
D
— Voltage level of the line
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Q. Which of the following is a common type of transmission line configuration?
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A.
Single-phase
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B.
Three-phase
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C.
Two-phase
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D.
Multi-phase
Solution
Three-phase transmission lines are the most common configuration used for efficient power transmission.
Correct Answer:
B
— Three-phase
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Q. Which type of transmission line is most commonly used for long distances?
-
A.
Overhead lines
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B.
Underground cables
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C.
Submarine cables
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D.
Microgrid connections
Solution
Overhead lines are the most common type of transmission line used for long distances due to their cost-effectiveness.
Correct Answer:
A
— Overhead lines
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