Q.1
The unequal voltage distribution across individual unit of string of suspension insulator is __________
  • a) desirable and expressed by string efficiency
  • b) undesirable and expressed by string efficiency
  • c) desirable and expressed by impulse ratio
  • d) undesirable and expressed by impulse ratio
Q.2
Glass insulator cannot be used for voltage above __________
  • a) 25 KV
  • b) 11 KV
  • c) 33 KV
  • d) 50 KV
Q.3
Which of the following location is suitable to use shackle insulator?
  • a) Sharp Turn in transmission line
  • b) Dead end of low voltage distribution line
  • c) For bearing High Voltage transmission line conductor
  • d) Dead end of EHV transmission line
Q.4
Which of the following insulator is used for insulating stay wire from pole?
  • a) Pin type insulator
  • b) Shackle insulator
  • c) Suspension insulator
  • d) Stay insulator
Q.5
What is the reason for unequal distribution of voltage among different unit of suspension insulator?
  • a) Unequal capacitance of different units
  • b) Unequal distribution of charging current caused by stray capacitance
  • c) Unequal resistivity of different units
  • d) Dirt deposited over the insulator disc
Q.6
Arcing horns are used for ______________
  • a) protecting insulators from birds
  • b) protecting insulators from cracking or breaking due to flash over
  • c) improving string efficiency
  • d) protecting insulator from deposition of dirt
Q.7
What is the effect of rain on string efficiency?
  • a) It becomes very low
  • b) It reduces slightly
  • c) It does not changes
  • d) It is improved
Q.8
A suspension string have 3 units. Voltage across topmost and lower most unit of string are 6.volts andvolts respectively. What is the voltage across middle string, if voltage across whole string is 25.volts?
  • a) 103.47 volts
  • b) 8.05 volts
  • c) 83.6 volts
  • d) 25.76 volts
Q.9
If voltage across lowermost unit of a string is 34.of voltage across whole string and string efficiency is 57.46%. What is the voltage across whole string.
  • a) 100%of line voltage
  • b) 43.64% of line voltage
  • c) 75.2% of line voltage
  • d) 92.26% of line voltage
Q.10
By using which of the following method hundred percent string efficiency can be achieved?
  • a) Using long cross arms
  • b) Capacitance grading
  • c) Static shielding
  • d) 100% string efficiency cannot be achieved
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