The material commonly used for insulation in high voltage cables is

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

Which of the following equipment, for regulating the voltage in distribution feeder, will be most economical?

A. Static condenser

B. Synchronous condenser

C. Tap changing transformer

D. Booster transformer

The frequency of voltage generated, in case of generators, can be increased by

A. Using reactors

B. Increasing the load

C. Adjusting the governor

D. Reducing the terminal voltage

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