Power Generation

Binary’vapour cycles are used to_____________?

A. increase the performance of the condenser
B. increase the efficiency of the plant
C. increase efficiency of the turbine

Mercury is a choice with steam in binary vapour cycle because it has____________?

A. higher critical temperature and pressure
B. higher saturation temperature than other fluids
C. relatively low vapourisation pressure
D. all above

Reheat cycle in steam power plant is used to________________?

A. utilise heat of flue gases
B. increase thermal efficiency
C. improve condenser performance
D. reduce loss of heat

In regenerative cycle feed water is heated by_____________?

A. exhaust gases
B. heaters
C. draining steam from the turbine
D. all above

The maximum percentage gain in Regenerative feed heating cycle thermal efficiency____________?

A. increases with number of feed heaters increasing
B. decreases with number of feed heaters increasing
C. remains same unaffected by number of feed heaters
D. none of the above

In a regenerative feed heating cycle, the greatest economy is affected___________?

A. when steam is extracted from only one suitable point of steam turbine
B. when steam is extracted from several places in different stages of steam turbine
C. when steam is extracted only from the last stage of steam turbine
D. when steam is extracted only from the first stage of steam turbine

In a regenerative feed heating cycle, the optimum value of the fraction of steam extracted for feed heating________________?

A. decreases with increase in Rankine cycle efficiency
B. increases with increase in Rankine cycle efficiency
C. is unaffected by increase in Rankine cycle efficiency
D. none of the above

Regenerative cycle thermal efficiency_______________?

A. is always greater than simple Rankine thermal efficiency
B. is greater than simple Rankine cycle thermal efficiency only when steam is bled at particular pressure
C. is same as simple Rankine cycle thermal efficiency
D. is always less than simple Rankine cycle thermal efficiency

In Rankine cycle the work output from the turbine is given by__________?

A. change of internal energy between inlet and outlet
B. change of enthaply between inlet and outlet
C. change of entropy between inlet and outlet
D. change of temperature between inlet and outlet

Carnot cycle comprises of_______?

A. two isentropic processes and two constant volume processes
B. two isentropic processes and two constant pressure processes
E. two isothermal processes and three constant pressure processes
D. none of the above