Electrical Engineering MCQs

Page No. 309

Binary’vapour cycles are used to_____________?


aincrease the performance of the condenser

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bincrease the efficiency of the plant

✓


cincrease efficiency of the turbine

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dnone of these

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


ahigher critical temperature and pressure

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bhigher saturation temperature than other fluids

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crelatively low vapourisation pressure

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dall above

✓


View Answer all above

Reheat cycle in steam power plant is used to________________?


autilise heat of flue gases

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bincrease thermal efficiency

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cimprove condenser performance

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dreduce loss of heat

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In regenerative cycle feed water is heated by_____________?


aexhaust gases

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bheaters

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c draining steam from the turbine

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dall above

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


aincreases with number of feed heaters increasing

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bdecreases with number of feed heaters increasing

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c remains same unaffected by number of feed heaters

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dnone of the above

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


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

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

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

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dwhen steam is extracted only from the first stage of steam turbine

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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

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bincreases with increase in Rankine cycle efficiency

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cis unaffected by increase in Rankine cycle efficiency

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d none of the above

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Regenerative cycle thermal efficiency_______________?


ais always greater than simple Rankine thermal efficiency

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

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cis same as simple Rankine cycle thermal efficiency

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d is always less than simple Rankine cycle thermal efficiency

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


achange of internal energy between inlet and outlet

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b change of enthaply between inlet and outlet

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cchange of entropy between inlet and outlet

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dchange of temperature between inlet and outlet

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Carnot cycle comprises of_______?


atwo isentropic processes and two constant volume processes

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b two isentropic processes and two constant pressure processes

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ctwo isothermal processes and three constant pressure processes

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dnone of the above

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