Q. In a power system, what does the term 'load flow' refer to?
-
A.
The flow of electrical energy from generation to load
-
B.
The flow of water in hydroelectric plants
-
C.
The movement of switchgear components
-
D.
The distribution of voltage levels
Solution
Load flow analysis studies the flow of electrical energy from generation sources to the load in a power system.
Correct Answer:
A
— The flow of electrical energy from generation to load
Learn More →
Q. What does the term 'short-circuit current' refer to?
-
A.
The current flowing during normal operation
-
B.
The maximum current that can flow during a fault condition
-
C.
The current flowing through a transformer
-
D.
The current used for load flow calculations
Solution
Short-circuit current refers to the maximum current that can flow through a circuit during a fault condition.
Correct Answer:
B
— The maximum current that can flow during a fault condition
Learn More →
Q. What is the function of a relay in protection systems?
-
A.
To generate power
-
B.
To measure voltage
-
C.
To detect faults and initiate circuit interruption
-
D.
To regulate current
Solution
Relays are used to detect faults and initiate the operation of circuit breakers to isolate faulty sections.
Correct Answer:
C
— To detect faults and initiate circuit interruption
Learn More →
Q. What is the main advantage of using a vacuum circuit breaker?
-
A.
Low cost
-
B.
High insulation strength
-
C.
Compact size
-
D.
All of the above
Solution
Vacuum circuit breakers offer low cost, high insulation strength, and compact size, making them advantageous in many applications.
Correct Answer:
D
— All of the above
Learn More →
Q. What is the main advantage of using vacuum circuit breakers?
-
A.
Low cost
-
B.
High reliability and maintenance-free operation
-
C.
Large size
-
D.
High power factor
Solution
Vacuum circuit breakers are known for their high reliability and maintenance-free operation due to the vacuum environment.
Correct Answer:
B
— High reliability and maintenance-free operation
Learn More →
Q. What is the primary function of switchgear in an electrical system?
-
A.
To generate electricity
-
B.
To control and protect electrical equipment
-
C.
To transmit power over long distances
-
D.
To distribute power to end users
Solution
Switchgear is used to control, protect, and isolate electrical equipment in a power system.
Correct Answer:
B
— To control and protect electrical equipment
Learn More →
Q. What is the primary purpose of a surge arrester?
-
A.
To increase voltage
-
B.
To protect equipment from voltage spikes
-
C.
To measure current
-
D.
To regulate frequency
Solution
Surge arresters are used to protect electrical equipment from voltage spikes caused by lightning or switching operations.
Correct Answer:
B
— To protect equipment from voltage spikes
Learn More →
Q. What is the purpose of a circuit breaker in switchgear?
-
A.
To increase voltage
-
B.
To interrupt fault currents
-
C.
To measure current
-
D.
To provide reactive power
Solution
Circuit breakers are designed to interrupt fault currents and protect the electrical system from damage.
Correct Answer:
B
— To interrupt fault currents
Learn More →
Q. What is the purpose of a differential relay in protection systems?
-
A.
To detect phase imbalance
-
B.
To measure voltage levels
-
C.
To compare currents in two circuits
-
D.
To provide backup protection
Solution
Differential relays compare the currents entering and leaving a protected zone to detect faults.
Correct Answer:
C
— To compare currents in two circuits
Learn More →
Q. What is the role of a surge arrester in switchgear?
-
A.
To regulate voltage
-
B.
To protect against voltage spikes
-
C.
To measure current
-
D.
To provide reactive power support
Solution
Surge arresters protect electrical equipment from voltage spikes caused by lightning or switching operations.
Correct Answer:
B
— To protect against voltage spikes
Learn More →
Q. Which component is used to protect transformers from overload?
-
A.
Fuse
-
B.
Current transformer
-
C.
Voltage regulator
-
D.
Surge arrester
Solution
Fuses are commonly used to protect transformers from overload conditions by disconnecting the circuit when excessive current flows.
Correct Answer:
A
— Fuse
Learn More →
Q. Which of the following is a common type of protective relay?
-
A.
Overcurrent relay
-
B.
Voltage regulator
-
C.
Transformer
-
D.
Capacitor bank
Solution
An overcurrent relay is a protective device that operates when the current exceeds a predetermined value.
Correct Answer:
A
— Overcurrent relay
Learn More →
Q. Which of the following is NOT a type of switchgear?
-
A.
Air-insulated switchgear
-
B.
Gas-insulated switchgear
-
C.
Oil-filled switchgear
-
D.
Hydraulic switchgear
Solution
Hydraulic switchgear is not a recognized type of switchgear; the others are common types used in electrical systems.
Correct Answer:
D
— Hydraulic switchgear
Learn More →
Q. Which protection scheme is commonly used for transformer protection?
-
A.
Overcurrent protection
-
B.
Differential protection
-
C.
Distance protection
-
D.
Voltage protection
Solution
Differential protection is commonly used for transformers to detect internal faults.
Correct Answer:
B
— Differential protection
Learn More →
Q. Which type of switchgear is typically used for high voltage applications?
-
A.
Air-insulated switchgear
-
B.
Gas-insulated switchgear
-
C.
Miniature circuit breaker
-
D.
Fuse switch
Solution
Gas-insulated switchgear (GIS) is commonly used for high voltage applications due to its compact design and reliability.
Correct Answer:
B
— Gas-insulated switchgear
Learn More →
Showing 1 to 15 of 15 (1 Pages)
