Q. What is the primary function of a transmission line's reactance?
A.
To store energy
B.
To limit current flow
C.
To provide voltage regulation
D.
To reduce losses
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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 function of protective relays in power systems?
A.
To generate electricity
B.
To monitor system performance
C.
To detect faults and isolate sections
D.
To regulate voltage
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Solution
Protective relays are designed to detect faults in the power system and isolate affected sections to prevent damage and ensure safety.
Correct Answer:
C
— To detect faults and isolate sections
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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
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Solution
Switchgear is used to control, protect, and isolate electrical equipment in a power system.
Correct Answer:
B
— To control and protect electrical equipment
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Q. What is the primary material used in the core of a transformer?
A.
Copper
B.
Aluminum
C.
Silicon steel
D.
Iron
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Solution
The primary material used in the core of a transformer is silicon steel, which has good magnetic properties.
Correct Answer:
C
— Silicon steel
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Q. What is the primary method of generating electricity in a hydroelectric power plant?
A.
Wind turbines
B.
Steam turbines
C.
Water turbines
D.
Solar panels
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Solution
Hydroelectric power plants primarily use water turbines to convert the kinetic energy of flowing water into electrical energy.
Correct Answer:
C
— Water turbines
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Q. What is the primary method of generating electricity in a thermal power plant?
A.
Solar panels
B.
Wind turbines
C.
Burning fossil fuels
D.
Hydroelectric dams
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Solution
Thermal power plants primarily generate electricity by burning fossil fuels such as coal, natural gas, or oil to produce steam that drives a turbine.
Correct Answer:
C
— Burning fossil fuels
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Q. What is the primary purpose of a boost converter?
A.
To step down voltage
B.
To step up voltage
C.
To convert AC to DC
D.
To filter noise from DC
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Solution
A boost converter is designed to step up the input voltage to a higher output voltage.
Correct Answer:
B
— To step up voltage
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Q. What is the primary purpose of a load flow study?
A.
To determine the stability of the system
B.
To analyze the economic operation of the system
C.
To calculate the voltage drops and power flows in the network
D.
To design new transmission lines
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Solution
Load flow studies are conducted to calculate voltage drops, power flows, and to ensure that the system operates within its limits.
Correct Answer:
C
— To calculate the voltage drops and power flows in the network
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Q. What is the primary purpose of a snubber circuit in power electronics?
A.
To increase efficiency
B.
To protect against voltage spikes
C.
To reduce harmonics
D.
To improve power factor
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Solution
A snubber circuit is used to protect power electronic devices from voltage spikes and transients.
Correct Answer:
B
— To protect against voltage spikes
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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
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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
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Q. What is the primary purpose of a transformer in a power generation system?
A.
To generate electricity
B.
To convert AC to DC
C.
To step up or step down voltage
D.
To store energy
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Solution
Transformers are used in power generation systems to step up or step down voltage levels for efficient transmission and distribution of electricity.
Correct Answer:
C
— To step up or step down voltage
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Q. What is the primary purpose of a transformer in power generation?
A.
To generate electricity
B.
To step up or step down voltage
C.
To store energy
D.
To convert AC to DC
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Solution
Transformers are used in power generation to step up (increase) or step down (decrease) voltage levels for efficient transmission and distribution of electricity.
Correct Answer:
B
— To step up or step down voltage
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Q. What is the primary purpose of a transformer protection relay?
A.
To increase transformer efficiency
B.
To prevent transformer overheating
C.
To detect faults and isolate the transformer
D.
To improve voltage regulation
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Solution
Transformer protection relays are designed to detect faults and isolate the transformer to prevent damage and ensure safety.
Correct Answer:
C
— To detect faults and isolate the transformer
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Q. What is the primary purpose of a transmission line?
A.
To generate electricity
B.
To distribute electricity to consumers
C.
To transmit electricity over long distances
D.
To convert AC to DC
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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 circuit breakers in switchgear?
A.
To regulate voltage
B.
To protect electrical circuits from overloads
C.
To convert AC to DC
D.
To measure current
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Solution
Circuit breakers are designed to protect electrical circuits from overloads and short circuits by interrupting the flow of electricity.
Correct Answer:
B
— To protect electrical circuits from overloads
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Q. What is the primary purpose of load flow analysis in power systems?
A.
To determine the efficiency of generators
B.
To analyze voltage levels and power flows
C.
To calculate energy losses
D.
To design transmission lines
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Solution
Load flow analysis is used to analyze voltage levels and power flows in a power system to ensure stability and reliability.
Correct Answer:
B
— To analyze voltage levels and power flows
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Q. What is the primary purpose of protective relays in power systems?
A.
Control voltage levels
B.
Detect faults and isolate sections
C.
Regulate power factor
D.
Monitor load conditions
Show solution
Solution
Protective relays are designed to detect faults in the power system and isolate affected sections to prevent damage.
Correct Answer:
B
— Detect faults and isolate sections
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Q. What is the primary purpose of protective relays in transmission systems?
A.
To monitor voltage levels
B.
To disconnect faulty sections
C.
To regulate power flow
D.
To enhance transmission efficiency
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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 primary purpose of switchgear in power systems?
A.
To generate electricity
B.
To control and protect electrical equipment
C.
To store energy
D.
To convert voltage levels
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Solution
Switchgear is used to control, protect, and isolate electrical equipment in power systems, ensuring safe and reliable operation.
Correct Answer:
B
— To control and protect electrical equipment
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Q. What is the primary purpose of using a transformer in a transmission system?
A.
To increase voltage for transmission
B.
To decrease voltage for distribution
C.
To isolate sections of the network
D.
All of the above
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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 primary reason for using high voltage in transmission lines?
A.
To reduce insulation requirements
B.
To minimize energy losses
C.
To increase current flow
D.
To improve safety
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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 primary role of a circuit breaker in a transmission line?
A.
To regulate voltage
B.
To protect the line from overloads
C.
To increase transmission capacity
D.
To convert AC to DC
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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 primary role of capacitors in power systems?
A.
To increase current
B.
To store energy
C.
To improve power factor
D.
To convert AC to DC
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Solution
Capacitors are used in power systems to improve the power factor by providing reactive power support, thus enhancing system efficiency.
Correct Answer:
C
— To improve power factor
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Q. What is the purpose of a circuit breaker in a power system?
A.
To regulate voltage
B.
To protect the system from overloads and faults
C.
To convert AC to DC
D.
To increase power factor
Show solution
Solution
Circuit breakers are designed to protect electrical circuits from overloads and short circuits by interrupting the flow of current.
Correct Answer:
B
— To protect the system from overloads and faults
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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
Show solution
Solution
Circuit breakers are designed to interrupt fault currents and protect the electrical system from damage.
Correct Answer:
B
— To interrupt fault currents
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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
Show solution
Solution
Differential relays compare the currents entering and leaving a protected zone to detect faults.
Correct Answer:
C
— To compare currents in two circuits
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Q. What is the purpose of a switchgear in a transmission system?
A.
To generate electricity
B.
To control and protect electrical equipment
C.
To convert AC to DC
D.
To store energy
Show solution
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 tap changer in a transformer?
A.
To change the frequency
B.
To adjust the voltage ratio
C.
To increase efficiency
D.
To reduce harmonics
Show solution
Solution
A tap changer is used to adjust the voltage ratio of a transformer to maintain the desired output voltage.
Correct Answer:
B
— To adjust the voltage ratio
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Q. What is the purpose of a transformer in a power distribution system?
A.
To convert power to mechanical energy
B.
To reduce transmission losses
C.
To increase the frequency of the supply
D.
To provide backup power
Show solution
Solution
Transformers in power distribution systems help reduce transmission losses by stepping up voltage for long-distance transmission.
Correct Answer:
B
— To reduce transmission losses
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Q. What is the purpose of a transformer in a transmission system?
A.
To increase voltage for transmission
B.
To decrease voltage for distribution
C.
To convert AC to DC
D.
Both A and B
Show solution
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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