Transmission and Distribution

type insulators are generally not used for voltages beyond_________?

A. 1 kV
B. 11 kV
C. 22 kV
D. 33 kV

The current drawn by the line due to corona losses is___________?

A. non-sinusoidal
B. sinusoidal
C. triangular
D. square

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

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

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

In a substation the following equipment is not installed?

A. exciters
B. series capacitors
C. shunt reactors
D. voltatre transformers

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

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

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

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