Q. What is the effect of increasing the length of a transmission line on its impedance?
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A.
Impedance decreases
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B.
Impedance remains constant
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C.
Impedance increases
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D.
Impedance fluctuates
Solution
Increasing the length of a transmission line increases its impedance due to the longer path for current flow.
Correct Answer:
C
— Impedance increases
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Q. What is the main advantage of using a three-phase transmission system?
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A.
Lower cost
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B.
Higher efficiency
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C.
Simplicity in design
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D.
Reduced conductor size
Solution
A three-phase transmission system is more efficient than single-phase systems, allowing for better power transfer and reduced losses.
Correct Answer:
B
— Higher efficiency
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Q. What is the main function of a transformer in a transmission system?
-
A.
To increase or decrease voltage levels
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B.
To store electrical energy
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C.
To convert AC to DC
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D.
To protect the system from faults
Solution
Transformers are used to increase or decrease voltage levels in a transmission system to facilitate efficient power transfer.
Correct Answer:
A
— To increase or decrease voltage levels
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Q. What is the primary function of a protective relay in a transmission line?
-
A.
To regulate voltage
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B.
To detect faults and initiate disconnection
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C.
To measure current
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D.
To control power factor
Solution
The primary function of a protective relay is to detect faults in the transmission line and initiate disconnection to prevent damage.
Correct Answer:
B
— To detect faults and initiate disconnection
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Q. What is the primary reason for using high voltage in transmission lines?
-
A.
To reduce insulation requirements
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B.
To minimize energy losses
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C.
To increase current flow
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D.
To improve safety
Solution
High voltage is used in transmission lines to minimize energy losses due to resistance in the conductors.
Correct Answer:
B
— To minimize energy losses
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Q. What is the purpose of 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 convert AC to DC
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D.
Both A and B
Solution
Transformers are used to either increase voltage for efficient transmission or decrease voltage for safe distribution.
Correct Answer:
D
— Both A and B
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Q. What is the purpose of protective relays in a transmission system?
-
A.
To regulate voltage levels
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B.
To detect and isolate faults
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C.
To increase transmission capacity
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D.
To convert AC to DC
Solution
Protective relays are designed to detect faults in the system and isolate affected sections to prevent damage.
Correct Answer:
B
— To detect and isolate faults
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Q. Which component is used to interrupt the flow of current in a transmission line during a fault?
-
A.
Transformer
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B.
Circuit breaker
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C.
Capacitor bank
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D.
Inductor
Solution
Circuit breakers are used to interrupt the flow of current in a transmission line during faults to protect the system.
Correct Answer:
B
— Circuit breaker
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Q. Which of the following is a common type of switchgear used in transmission systems?
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A.
Fuses
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B.
Relays
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C.
Disconnect switches
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D.
All of the above
Solution
All of the listed components, including fuses, relays, and disconnect switches, are types of switchgear used in transmission systems.
Correct Answer:
D
— All of the above
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