Power Systems
A hydraulic turbine having rated speed of 250 rpm is connected to a synchronous generator. In order to produce power at 50 Hz, the numbers of pole are required in the generator

 16.
 6.
 12.
  24.

ANSWER DOWNLOAD EXAMIANS APP

Power Systems
A thermal power station needs space

 less than that required by the diesel power station of same output.
  less than that required by hydro-power station of same capacity.
 less than that required by a gas turbine power plant of same output.
 less than that required by atomic power station of the same output.

ANSWER DOWNLOAD EXAMIANS APP

Power Systems
The advantage of hydro electric power station over thermal power station is

 hydro electric station can be constructed at the place where the energy is required
 the initial cost of hydro electric power station is low
 hydro electric power station can supply the power throughout the year
 the operation cost of hydro electric power station is low

ANSWER DOWNLOAD EXAMIANS APP