Transmission and Distribution

The skin effect of a conductor will reduce as the__________?

A. resistivity of conductor material increases
B. permeability of conductor material increases
C. diameter increases
D. frequency increases

The following system is not generally used?

A. 1-phase 3 wire
B. 1-phase 4 wire
C. 3-phase 3 wire
D. 3-phase 4 wire

When a conductor carries more current on the surface as compared to core, it is due to___________?

A. permeability variation
B. corona
C. skin effect
D. unsymmetrical fault
E. none of the above

The voltage regulation in magnetic amplifier type voltage regulator is effected by__________?

A. electromagnetic induction
B. varying the resistance
C. varying the reactance
D. variable transformer

Series capacitors on transmission lines are of little use when the load VAR requirement is___________?

A. large
B. small
B. fluctuating
D. any of the above

Electro-mechanical voltage regulators are generally used in___________?

A. reactors
B. generators
C. transformers
D. all of the above

The angular displacement between two interconnected stations is mainly due to___________?

A. armature reactance of both alternators
B. reactance of the interconnector
C. synchronous reactance of both the alternators
D. all of the above

When an alternator connected to the bus-bar is shut down the bus-bar voltage will___________?

A. fall
B. rise
C. remain unchanged
D. none of the above

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
E. none of the above

When the interconnector between two stations has large reactance?

A. the transfer of power will take place with voltage fluctuation and noise
B. the transfer of power will take place with least loss
C. the stations will fall out of step be¬cause of large angular displacement between the stations
D. none of the above