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83 of 83 questions match · page 2 of 5. Answer in your head first, then check the solution.

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#21📘 EE Pocket Reviewer RojasEasy
The ionization during the arcing in a circuit breaker is generally accompanied by emissions of which of the following?
AHeat
BLight
CSound
DAll of these
#22📘 EE Pocket Reviewer RojasEasy
What is the purpose of installing a reactor in some strategic locations in a power system?
ATo bring down the fault level within the capacity of the switchgears
BTo resonate the line impedance so that maximum power can be transferred
CTo absorb the surges caused by lightning
DTo directly pass the surges to ground
#23📘 EE Pocket Reviewer RojasEasy
Thermal overload relays are used to protect the motor against over current due to which of the following situations?
AShort circuits
BGround currents
CHeavy loads
DAll of these
#24📘 EE Pocket Reviewer RojasEasy
In a circuit breaker, how do you call the time duration from the instant of the fault to the final extinction of the arc?
ATotal clearing time
BReclosing time
CLag time
DOperation time
#25📘 EE Pocket Reviewer RojasEasy
Which relay is used for motor protection against overload?
AImpedance relay
BThermal relay
CBuchholz’s relay
DDifferential relay
#26📘 EE Pocket Reviewer RojasEasy
Which of the following medium is employed in the extinction of the arc in air circuit breaker?
AWater
BOil
CSF6
DAir
#27📘 EE Pocket Reviewer RojasEasy
What is the power factor of the arc in a circuit breaker?
AZero pf
BUnity pf
CLagging pf
DLeading pf
#28📘 EE Pocket Reviewer RojasEasy
What do you mean by “burden” of a protective relay?
AIt is the power absorbed by the relay circuit
BIt is the power developed in the relay circuit
CIt is the power dissipated in the arc of a circuit breaker
DIt is the power required to operate the circuit breaker
#29📘 EE Pocket Reviewer RojasEasy
How do you call the voltage that appears across the contacts of a circuit breaker at the instant of arc extinction?
APeak voltage
BArc voltage
CRecovery voltage
DRestriking voltage
#30📘 EE Pocket Reviewer RojasEasy
In a high rupturing capacity fuse, what do you call the time from cut-off to the final current zero?
AOperation time
BArcing time
CTransient time
DBreaking time
#31📘 EE Pocket Reviewer RojasEasy
MHO relay is used in which of the following applications?
ACircuit breakers
BMotor controls
CTransmission lines
DFeeders
#32📘 EE Pocket Reviewer RojasEasy
Air blast circuit breakers are usually used for which of the following applications?
ARepeated duty
BInstantaneous duty
CIntermittent duty
DAll of these
#33📘 EE Pocket Reviewer RojasEasy
DC shunt relays are made of which of the following types of wires?
AFew turns of thin wires
BMany turns of thin wires
CFew turns of thick wires
DMany turns of thick wires
#34📘 EE Pocket Reviewer RojasEasy
Which of the following relays is used in feeders?
AThermal relay
BMerz-Price relay
CBuchholz relay
DTranslay relay
#35📘 EE Pocket Reviewer RojasEasy
Which type of circuit breaker is generally used in railway traction?
AAir break circuit breaker
BSF6 gas circuit breaker
CVacuum circuit breaker
DMinimum oil circuit breaker
#36📘 EE Pocket Reviewer RojasEasy
What is the meaning of SF6?
ASulphur fluoride
BSulphur difluoride
CSulphur hexafluoride
DSulphur tetrafluoride
#37📘 EE Pocket Reviewer RojasEasy
What is the resistance of a good fuse?
AZero
BInfinite
CBetween 10 to 50 ohms
DBetween 100 to 250 ohms
#38📘 EE Pocket Reviewer RojasEasy
Which of the following contact point metals has the highest melting point in comparison to others?
ASilver
BTungsten
CCopper
DGold
#39📘 EE Pocket Reviewer RojasEasy
What is the purpose of a pilot relay?
AFor high speed tripping
BFor delayed tripping
CFor preset tripping
DFor instantaneous closing
#40📘 EE Pocket Reviewer RojasEasy
Which of the following can be protected by a thermal protection switch?
AShort circuit
BTemperature rise
COver voltage
DOverload

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