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Transmission and distribution of electrical power
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 ⇒ Which of the following equipment is
used to limit short-circuit current level
in a substation ? Series reactor [other wrong options] [Discuss in forum] Isolator Lightning switch Coupling capacitor |
Q22 ⇒ For exact compensation of voltage drop
in the feeder the booster must work on linear portion of its V-I characteristics [other wrong options] [Discuss in forum] must be earthed must work on line voltage must work on non-linear portion of its V-I characteFistics |
Q23 ⇒ System grounding is done so that for all above reasons [other wrong options] [Discuss in forum] inductive interference between power
and communication circuits can be
controlled the floating potential on the lower voltage winding for a transformer is brought down to an insignificant value the arcing faults to earth would not set up dangerously high voltage on healthy phases |
Q24 ⇒ The effective resistance of a conductor
will be the same as 'ohmic resistance'
when current is uniformly distributed in the conductor cross-section [other wrong options] [Discuss in forum] power factor is unity voltage is low current is in true sine wave form |
Q25 ⇒ The surge resistance of cables is 50 ohms [other wrong options] [Discuss in forum] 20 ohms 200 ohms 300 ohms |
Q26 ⇒ In the cables sheaths are used to prevent the moisture from entering the cable [other wrong options] [Discuss in forum] provide strength to the cable provide proper insulation none of the above |
Q27 ⇒ Which of the following are the constants
of the transmission lines ? All of the above [other wrong options] [Discuss in forum] Resistance Inductance Capacitance |
Q28 ⇒ Which of the following methods is used
for laying of underground cables ? All of the above [other wrong options] [Discuss in forum] Direct laying Draw-in-system Solid system |
Q29 ⇒ Most of the high voltage transmission
lines in India are overhead [other wrong options] [Discuss in forum] undergound either of the above none of the above |
Q30 ⇒ Overhead lines generally use A.C.S.R. conductors [other wrong options] [Discuss in forum] copper conductors all aluminium conductors none of these |
Q31 ⇒ In a D.C. 3-wire distributor using balancers
and having unequal loads on the
two sides balancer connected to lightly- loaded side runs as a motor [other wrong options] [Discuss in forum] both balancers run as generators both balancers run as motors balancer connected to heavily- loaded side runs as a motor |
Q32 ⇒ A 3-phase 4 wire system is commonly
used on secondary distribution [other wrong options] [Discuss in forum] primary transmission secondary transmission primary distribution |
Q33 ⇒ Which of the following regulations is
considered best ? 0.02 [other wrong options] [Discuss in forum] 0.5 0.2 0.1 |
Q34 ⇒ A circuit is disconnected by isolators
when there is no current in the line [other wrong options] [Discuss in forum] line is energized line is on full load circuit breaker is not open |
Q35 ⇒ For transmission of power over a distance
of 200 km, the transmission voltage
should be 132 kV [other wrong options] [Discuss in forum] 66 kV 33 kV 11 kV |
Q36 ⇒ When the interconnector between two
stations has large reactance the stations will fall out of step because oflarge angular displacement, between the stations [other wrong options] [Discuss in forum] the transfer of power will take place
with voltage fluctuation and noise the transfer of power will take place with least loss none of the above |
Q37 ⇒ In A.C.S.R. conductor the function of
steel is to provide additional mechanical strength [other wrong options] [Discuss in forum] prevent corona take care of surges reduce inductance and subsequently improve power factor |
Q38 ⇒ Corona results in radio interference [other wrong options] [Discuss in forum] power factor improvement better regulation none of the above |
Q39 ⇒ In a 70/6 A.C.S.R. conductor there are 70 aluminium conductors and 6 steel conductors [other wrong options] [Discuss in forum] 35 aluminium conductors and 3 steel
conductors 70 steel conductors and 6 aluminium conductors none of the above |
Q40 ⇒ Steepness of the travelling waves is
alternated by ____ of the line resistance [other wrong options] [Discuss in forum] capacitance inductance all of the above |
Or |