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Home⇒ Engineering⇒
Switchgear and protection
1-Dont try to cram or spend more time here just read it fast and cover syllabus then practice MCQ's cheptor of same topic to check your progress. . |
2-Wrong options are also given but dont concentrate there, Right answer is in bold format. |
Q21 ⇒ H.R.C. fuses provide best protection
against short-circuits [other wrong options] [Discuss in forum] overload reverse current open-circuits |
Q22 ⇒ Ungrounded neutral transmission system
is not recommended because of system all of the above [other wrong options] [Discuss in forum] insulation being overstressed clue
to over voltages insulation overstress may lead to failure and subsequent phase to phase faults being inadequately protected against ground fault |
Q23 ⇒ A.C. network analyser is used to solve
problems of load flow, short-circuit and stability [other wrong options] [Discuss in forum] load flow load flow and short-circuit load flow and stability none of the above |
Q24 ⇒ ____ relay is preferred for phase fault on
short transrnission line. Reactance [other wrong options] [Discuss in forum] Induction type Impedance None of the above |
Q25 ⇒ Series reactors should have low resistance [other wrong options] [Discuss in forum] high resistance low impedance high impedance |
Q26 ⇒ Series capacitors are used to compensate for line inductive reactance [other wrong options] [Discuss in forum] compensate for line capacitive reactance improve line voltage none of the above |
Q27 ⇒ H.R.C. fuse, as compared to a rewirable
fuse, has all of the above [other wrong options] [Discuss in forum] no ageing effect high speed of operation high rupturing capacity |
Q28 ⇒ A balanced 3-phase system consists of positive sequence currents only [other wrong options] [Discuss in forum] zero sequence currents only negative and zero sequence currents zero, negative and positive sequence currents |
Q29 ⇒ H.R.C. fuses provide best protection in
case of short-circuits [other wrong options] [Discuss in forum] overloads open circuits none of the above |
Q30 ⇒ ____ gives rise to symmetrical fault ? Three-phase short-circuit [other wrong options] [Discuss in forum] Phase-to-phase Single phase to ground Double phase to ground None of the above |
Q31 ⇒ Reactance relays are used for phase
fault in ____ line. short [other wrong options] [Discuss in forum] medium long all of the above |
Q32 ⇒ The main factor in favour of the use of
aluminium as bus-bar material is its low cost [other wrong options] [Discuss in forum] low density low melting point high resistivity |
Q33 ⇒ SF6 gas is transported in liquid form in cylinders [other wrong options] [Discuss in forum] air cylinders gas cylinders solid form in boxes none of the above |
Q34 ⇒ The arcing contacts in a circuit breaker
are made of copper tungsten alloy [other wrong options] [Discuss in forum] porcelain electrolytic copper aluminium alloy |
Q35 ⇒ Thermal overload relays are used to
protect the motor against over current
due to heavy loads [other wrong options] [Discuss in forum] short-circuits grounds all of the above |
Q36 ⇒ An efficient and a well designed protective
relaying should have all of the above [other wrong options] [Discuss in forum] good selectivity and reliability economy and simplicity high speed and selectivity |
Q37 ⇒ Ionization in circuit breaker is facilitated
by all of the above [other wrong options] [Discuss in forum] high temperature increase of mean free path increasing field strength |
Q38 ⇒ The ground wire should not be smaller
than no. ____ copper 10 [other wrong options] [Discuss in forum] 2 4 6 |
Q39 ⇒ The reflection co-efficient at the open
circuited end of a transmission line unity [other wrong options] [Discuss in forum] zero infinity none of the above |
Q40 ⇒ Which of the following statements is
incorrect ? Lightning arrestors are used before the switchgear [other wrong options] [Discuss in forum] Shunt reactors are used as compensation
reactors The peak short current is (1.8 X √2) times the A.C. component The MVA at fault is equal to base MVA divided by per unit equivalent fault reactance |
Or |