1) Pin type insulators are generally not used for voltages beyond_________? a. 1 kV b. 11 kV c. 22 kV d. 33 kV
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2) The current drawn by the line due to corona losses is___________? a. non-sinusoidal b. sinusoidal c. triangular d. square
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3) The use of strain type insulators is made where the conductors are__________? a. dead ended b. at intermediate anchor towers c. any of the above d. none of the above
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4) The voltage drop, for constant voltage transmission is compensated by installing__________? a. inductors b. capacitors c. synchronous motors d. all of above e. none of the above
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5) jCorona usually occurs when the electrostatic stress in air around the conductor exceeds? a. 6.6 kV (r.m.s. value)/cm b. 11 kV (r.m.s. value)/cm c. 22 kV (maximum value)/cm d. 30 kV (maximum value)/cm
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6) In a substation the following equipment is not installed? a. exciters b. series capacitors c. shunt reactors d. voltatre transformers
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7) For which of the following equipment current rating is not necessary? a. Circuit breakers b. Isolators c. Load break switch d. Circuit breakers and load break switches
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8) A circuit is disconnected by isolators when____________? a. line is energized b. there is no current in the line c. line is on full load d. circuit breaker is not open
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9) By which of the following a bus-bar is rated? a. Current only b. Current and voltage c. Current, voltage and frequency d. Current, voltage, frequency and short time current
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10) In aluminium conductors, steel core is provided to____________? a. compensate for skin effect b. neutralise proximity effect c. reduce line inductance d. increase the tensile strength
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