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#41📘 EE Pocket Reviewer RojasEasy
If the force on the contacts of a circuit breaker is increased, what will happen to the contact resistance?
AIt remains the same
BIt will decrease
CIt will increase linearly
DIt will increase exponentially
#42📘 EE Pocket Reviewer RojasEasy
What is the phase relation between the arc voltage to the arc current in a circuit breaker?
AThe arc current is in-phase with the arc voltage
BThe arc current lags the arc voltage by 90°
CThe arc current leads the arc voltage by 90°
DThe arc current lags the arc voltage by 180°
#43📘 EE Pocket Reviewer RojasEasy
Flame proof switch gear are usually preferred in which of the following applications?
AIn substations
BIn mines
CIn high MVA capacity circuits
DIn low voltage transmission lines
#44📘 EE Pocket Reviewer RojasEasy
Which one is not a part of a circuit breaker?
AExplosion pot
BConservator
CFixed and moving contacts
DOperating mechanism
#45📘 EE Pocket Reviewer RojasEasy
Which of the following circuit breakers has the lowest voltage range?
ATank type oil circuit breaker
BAir blast circuit breaker
CAir break circuit breaker
DSF6 circuit breaker
#46📘 EE Pocket Reviewer RojasEasy
Which one is considered as the main problem in a circuit breaker?
ATo extinguish the arc
BTo ionize the air inside the circuit breaker
CTo produce power for creating the arc
DTo deliver large power to a circuit
#47📘 EE Pocket Reviewer RojasEasy
Which of the following is the medium commonly used by contactors?
AAir
BSF6
COil
DAny of these
#48📘 EE Pocket Reviewer RojasEasy
What is an automatic device that operates at preset values?
AFuse
BContactor
CRegulator
DRelay
#49📘 EE Pocket Reviewer RojasEasy
A fuse is normally what type of device?
AA voltage limiting device
BA current limiting device
CA power limiting device
DA frequency limiting device
#50📘 EE Pocket Reviewer RojasEasy
In a circuit breaker, how do you call the time duration from the instant of the fault to the instant of energizing of the trip coil?
AClearing time
BLag time
CProtection time
DOperation time
#51📘 EE Pocket Reviewer RojasEasy
Which one is called “fusing factor” in high rupturing capacity fuse?
AMinimum fusing current/current rating
BCurrent rating/minimum fusing current
CMinimum fusing current/minimum rupturing time
DNone of these
#52📘 EE Pocket Reviewer RojasEasy
Which of the following cannot be used as the medium for extinguishing the arc in a circuit breaker?
ASF6 gas
BVacuum
CAir
DWater
#53📘 EE Pocket Reviewer RojasEasy
Circuit breakers used for remote operation must be equipped with which of the following?
AShunt trip
BInverse-time trip
CTime-delay trip
DAny of these
#54📘 EE Pocket Reviewer RojasEasy
What do you call the voltage that appears across the contacts of a circuit breaker after the final arc extinction has occurred?
APeak voltage
BArc voltage
CRecovery voltage
DRestriking voltage
#55📘 EE Pocket Reviewer RojasEasy
Which of the following is not a type of the contactor used in a circuit breaker?
AElectro-magnetic
BElectro-pneumatic
CPneumatic
DVacuum
#56📘 EE Pocket Reviewer RojasEasy
Which of the following is the formula in solving the three-phase breaking capacity of a circuit breaker in MVA?
A\(\sqrt{3}\) × rated service voltage × rated symmetrical current
B3 × rated service voltage × rated symmetrical current
C1.1 x rated service voltage x rated symmetrical current
D1.5 x rated service voltage x rated symmetrical current
#57📘 EE Pocket Reviewer RojasEasy
What is the purpose of a switchgear device?
ATo interrupt an electric circuit
BTo switch an electrical circuit
CTo control an electrical circuit
DAll of these
#58📘 EE Pocket Reviewer RojasEasy
Which of the following materials is best suited for making a fuse wire?
ASilver
BLead
CAluminum
DCopper
#59📘 EE Pocket Reviewer RojasEasy
What do you call the relay in which the measurement is performed by a stationary circuit and which has no moving parts?
ADifferential relay
BStatic relay
CTime delay relay
DInstantaneous relay
#60📘 EE Pocket Reviewer RojasEasy
Which of the following is true about the SF6 gas?
AIt is colorless gas
BIt is odorless gas
CIt is a non-toxic gas
DAll of these

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