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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. |
Q61 ⇒ If the height of transmission tower is
increased, which of the following; parameters
is likely to change ? Capacitance [other wrong options] [Discuss in forum] Inductance Resistance All of the above None of the above |
Q62 ⇒ To increase the capacity of a transmission
line for transmitting power which
of the following must be decreased ? Line inductance [other wrong options] [Discuss in forum] Capacitance Voltage All of the above |
Q63 ⇒ The ground ring transmission lines are
used to reduce the earth capacitance of the lowest unit [other wrong options] [Discuss in forum] reduce the transmission losses increase the earth capacitance of the lowest unit none of the above |
Q64 ⇒ Ground wire is used to connect, a circuit conductor or other device to an earth-plate [other wrong options] [Discuss in forum] avoid overloading give the support to the tower give good regulation |
Q65 ⇒ Overhead system can be designed for
operation upto 400 kV [other wrong options] [Discuss in forum] 11 kV 33 kV 66 kV |
Q66 ⇒ The phenomenon of rise in voltage at
the receiving end of the open-circuited
or lightly loaded line is called the Ferranti effect [other wrong options] [Discuss in forum] Seeback effect Raman effect none of the above |
Q67 ⇒ Due to which of the following reasons the
cables should not, be operated too hot ? All of the above [other wrong options] [Discuss in forum] The oil may loose its viscosity and it
may start drawing off from higher
levels Expansion of the oil may cause the sheath to burst Unequal expansion may create voids in the insulation which will lead to ionization The thermal instability may rise due to the rapid increase of dielectric losses with temperature |
Q68 ⇒ The conductors of the overhead lines
are stranded [other wrong options] [Discuss in forum] solid both solid and stranded none of the above |
Q69 ⇒ The material generally used for armour
of high voltage cables is steel [other wrong options] [Discuss in forum] aluminium brass copper |
Q70 ⇒ A uniformly-loaded D.C. distributor is
fed at both ends with equal voltages. As
compared to a similar distributor fed at
one end only, the drop at the middle
point is one-fourth [other wrong options] [Discuss in forum] one-third one-half twice none of the above |
Q71 ⇒ Which of the following is not a constituent
for making porcelain insulators ? Silica [other wrong options] [Discuss in forum] Quartz Kaolin Felspar |
Q72 ⇒ A conductor due to sag between two
supports, takes the form of catenary [other wrong options] [Discuss in forum] semi-circle triangle ellipse |
Q73 ⇒ In a substation the following equipment
is not installed exciters [other wrong options] [Discuss in forum] series capacitors shunt reactors voltage transformers |
Q74 ⇒ Which of the following equipment, for
regulating the voltage in distribution
feeder, will be most economical ? Booster transformer [other wrong options] [Discuss in forum] Static condenser Synchronous condenser Tap changing transforraer |
Q75 ⇒ When an alternator connected to the
bus-bar is shut, down the bus-bar voltage
will remain unchanged [other wrong options] [Discuss in forum] fall rise none of the above |
Q76 ⇒ By which of the following methods voltage
of transmission can be regulated ? Any of the above methods [other wrong options] [Discuss in forum] Use of series capacitors to neutralise
the effect of series reactance Switching in shunt capacitors at the receiving end during heavy loads Use of tap changing transformers |
Q77 ⇒ In context of corona, if the conductors
are polished and smooth, which of the
following statements is correct ? Corona glow will be uniform along the length of the conductor [other wrong options] [Discuss in forum] Hissing sound will be more intense Power loss will be least Corona glow will not occur |
Q78 ⇒ Which of the following are connected by
the service mains ? Distributor and consumer terminals [other wrong options] [Discuss in forum] Transformer and earth Distributor and relay system Distributor and transformer |
Q79 ⇒ By which of the following factors is the
sag of a transmission line least affected
? Current through the conductor [other wrong options] [Discuss in forum] Ice deposited on the conductor Self weight of conductor Temperature of surrounding air None of the above |
Q80 ⇒ A synchronous condenser is generally
installed at the of the ____ transmission
line receiving end [other wrong options] [Discuss in forum] sending end middle none of the above |
Or |