Electrical Engineering MCQs

Page No. 309

Binary’vapour cycles are used to_____________?


aincrease the performance of the condenser


bincrease the efficiency of the plant


cincrease efficiency of the turbine


dnone of these



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


ahigher critical temperature and pressure


bhigher saturation temperature than other fluids


crelatively low vapourisation pressure


dall above


View Answer all above

Reheat cycle in steam power plant is used to________________?


autilise heat of flue gases


bincrease thermal efficiency


cimprove condenser performance


dreduce loss of heat



In regenerative cycle feed water is heated by_____________?


aexhaust gases


bheaters


c draining steam from the turbine


dall above



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


aincreases with number of feed heaters increasing


bdecreases with number of feed heaters increasing


c remains same unaffected by number of feed heaters


dnone of the above



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


awhen steam is extracted from only one suitable point of steam turbine


bwhen steam is extracted from several places in different stages of steam turbine


cwhen steam is extracted only from the last stage of steam turbine


dwhen 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________________?


adecreases with increase in Rankine cycle efficiency


bincreases with increase in Rankine cycle efficiency


cis unaffected by increase in Rankine cycle efficiency


d none of the above



Regenerative cycle thermal efficiency_______________?


ais always greater than simple Rankine thermal efficiency


bis greater than simple Rankine cycle thermal efficiency only when steam is bled at particular pressure


cis 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__________?


achange of internal energy between inlet and outlet


b change of enthaply between inlet and outlet


cchange of entropy between inlet and outlet


dchange of temperature between inlet and outlet



Carnot cycle comprises of_______?


atwo isentropic processes and two constant volume processes


b two isentropic processes and two constant pressure processes


ctwo isothermal processes and three constant pressure processes


dnone of the above



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