Electrical Engineering MCQs

Page No. 304

The efficiency of a modern boiler using coal and heat recovery equipment is about_____________?


a25 to 30%


b40 to 50%


c65 to 70%


d85 to 90%


View Answer 85 to 90%

The maximum length of a screw conveyer is about___________?


a30 metres


b40 metres


c60 metres


d100 metres


View Answer 30 metres

Belt conveyer can be used to transport coal at inclinations upto____________?


a30°


b60°


c80°


d 90°


View Answer 30°

Steam turbines commonly used in steam power station are__________?


a condensing type


bnon-condensing type


cnone of the above


dnone of the above


View Answer condensing type

For the safety of a steam boiler the number of safety valves fitted are____________?


a four


bthree


ctwo


done


View Answer two

Pipes carrying steam are generally made up of_____________?


a steel


b cast iron


ccopper


daluminium


View Answer steel

Evaporative type of condenser has___________?


a steam in pipes surrounded by water


bwater in pipes surrounded by steam


ceither A. or (b)


dnone of the above



In a regenerative surface condenser_____________?


athere is one pump to remove air and condensate


bthere are two pumps to remove air and condensate


cthere are three pumps to remove air, vapour and condensate


d there is no pump, the condensate gets removed by gravity



In a steam power plant, the function of a condenser is__________?


ato maintain pressure below atmospheric to increase work output from the primemover


bto receive large volumes of steam exhausted from steam prime mover


cto condense large volumes of steam to water which may be used again in boiler


dall of the above


View Answer all of the above

Edward’s air pump____________?


aremoves air and also vapour from condenser


b removes only air from condenser


cremoves only un-condensed vapour from condenser


dremoves air alongwith vapour and also the condensed water from condenser



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