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

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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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