Protection Systems MCQs | Electrical Engineering Quiz – Questions and Answer
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Protection Systems MCQs
What is the main purpose of a protection system in an electrical network?
a) To control the voltage
b) To protect the equipment from damage
c) To increase the power factor
d) To generate power
Which type of fault is caused by a breakdown of the insulation between two conductors?
a) Overload fault
b) Short circuit fault
c) Ground fault
d) Phase-to-phase fault
What is the function of a circuit breaker in a protection system?
a) To limit the current flow in a circuit
b) To convert AC to DC
c) To control the voltage
d) To interrupt the current flow in a circuit
What is the purpose of a relay in a protection system?
a) To sense the fault and send a signal to the circuit breaker
b) To convert AC to DC
c) To store electrical energy
d) To control the voltage
Which type of relay is used to protect a transformer from thermal overloading?
a) Differential relay
b) Distance relay
c) Overcurrent relay
d) Buchholz relay
What is the purpose of a differential relay in a protection system?
a) To detect phase-to-phase faults
b) To detect ground faults
c) To detect overcurrents
d) To detect internal faults in a transformer
Which type of relay is used to protect a transmission line from overcurrents?
a) Differential relay
b) Distance relay
c) Overcurrent relay
d) Buchholz relay
What is the purpose of a ground fault relay in a protection system?
a) To detect phase-to-phase faults
b) To detect ground faults
c) To detect overcurrents
d) To detect internal faults in a transformer
Which type of relay is used to protect a generator from faults?
a) Differential relay
b) Distance relay
c) Overcurrent relay
d) Underfrequency relay
What is the purpose of an underfrequency relay in a protection system?
a) To detect phase-to-phase faults
b) To detect ground faults
c) To detect overcurrents
d) To detect low frequency in the power system
What is the purpose of a Buchholz relay in a transformer?
a) To detect overcurrents
b) To detect overvoltage
c) To detect low oil level
d) To detect gas formation due to faults
Which type of relay is used to protect a transmission line from overloading?
a) Differential relay
b) Distance relay
c) Overcurrent relay
d) Overvoltage relay
What is the purpose of a current transformer (CT) in a protection system?
a) To step up the voltage
b) To step down the voltage
c) To measure the current flowing through a circuit
d) To measure the voltage across a circuit
Which type of relay is used to protect a motor from under-voltage?
a) Differential relay
b) Distance relay
c) Overcurrent relay
d) Under-voltage relay
What is the purpose of a frequency relay in a protection system?
a) To detect overcurrents
b) To detect overvoltage
c) To detect low frequency
d) To detect high frequency
Which type of relay is used to protect a motor from overload?
a) Differential relay
b) Distance relay
c) Overcurrent relay
d) Overload relay
What is the purpose of a surge arrester in a protection system?
a) To protect against lightning strikes
b) To regulate the voltage
c) To convert AC to DC
d) To limit the current flow in a circuit
Which type of relay is used to protect a transformer from overloading?
a) Differential relay
b) Distance relay
c) Overcurrent relay
d) Overload relay
What is the purpose of a directional relay in a protection system?
a) To detect phase-to-phase faults
b) To detect ground faults
c) To detect overcurrents
d) To detect the direction of the fault
Which type of relay is used to protect a generator from overloading?
a) Differential relay
b) Distance relay
c) Overcurrent relay
d) Overload relay
What is the purpose of a synchronizing relay in a protection system?
a) To synchronize the frequency of two power sources before connecting them
b) To sense the fault and send a signal to the circuit breaker
c) To detect the direction of the fault
d) To detect overcurrents
Which type of relay is used to protect a busbar in a substation?
a) Differential relay
b) Distance relay
c) Overcurrent relay
d) Overvoltage relay
What is the purpose of a backup relay in a protection system?
a) To act as a secondary protection in case the primary relay fails
b) To detect the direction of the fault
c) To limit the current flow in a circuit
d) To sense the fault and send a signal to the circuit breaker
Which type of relay is used to protect a capacitor bank in a substation?
a) Differential relay
b) Distance relay
c) Overcurrent relay
d) Overvoltage relay
What is the purpose of a power transformer in a substation?
a) To step up or step down the voltage
b) To interrupt the current flow in a circuit
c) To store electrical energy
d) To convert AC to DC
Overcurrent relays are used to protect against which type of faults in power systems?
a) Short-circuit faults
b) Open-circuit faults
c) Ground faults
d) Transient faults
What is the pickup current of an overcurrent relay?
a) The current that causes the relay to operate
b) The maximum current that the relay can handle
c) The minimum current that the relay can handle
d) The rated current of the relay
What is the time delay of an overcurrent relay?
a) The time it takes for the relay to operate after the pickup current is reached
b) The time it takes for the relay to reset after a fault is cleared
c) The time it takes for the relay to trip the circuit breaker after it operates
d) The time it takes for the relay to measure the current in the circuit
Which type of overcurrent relay is used to protect against overcurrents that persist for a long time?
a) Instantaneous overcurrent relay
b) Time-delay overcurrent relay
c) Inverse-time overcurrent relay
d) Directional overcurrent relay
Which type of overcurrent relay is used to protect against overcurrents that occur for a short duration?
a) Instantaneous overcurrent relay
b) Time-delay overcurrent relay
c) Inverse-time overcurrent relay
d) Directional overcurrent relay
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