low operating cost

they can be started and loaded very quickly

they can be used as base load and peak load plants as well

all of the above

operating cost is low and initial cost is high

operating cost is high and initial cost is low

both operating and initial costs are high

both operating and initial costs are low

the difference of water level between the level in the storage and tail race

the height of water level in the river where the tail race is provided

the height of water level in the river where the storage is provided

all of the above

the steam chest and the turbine in a thermal station

the dam and the turbine in a hydrostation

the turbine and the discharge drain

the heat exchanger and the turbine in a nuclear power plant

supply water at constant pressure

relieve water hammer pressures in the penstock pipe

produce surge in the pipeline

none of the above