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1) Load carrying capacity of belt conveyor is about___________? a. 20 to 40 tonnes/hr b. 50 to 100 tonnes/hr c. 100 to 150 tonnes/hr d. 150 to 200 tonnes/hr
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2) In coal preparation plant, magnetic separators are used to remove___________? a. dust b. clinkers c. iron particles d. sand
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3) Secondary air is the air used to______________? a. reduce the flame length b. increase the flame length c. transport and dry the coal d. provide air round the burners for getting optimum combustion
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4) Primary air is that air which is used to_____________? a. reduce the flame length b. increase the flame length c. transport and dry the coal d. provide air around burners for get¬ting optimum combustion
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5) Caking coals are those which__________? a. burn completely b. burn freely c. do not form ash d. form lumps or masses of coke
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6) The capacity of large turbo-generators varies from___________? a. 20 to 100 MW b. 50 to 300 MW c. 70 to 400 MW d. 100 to 650 MW
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7) Economisers improve boiler efficiency by__________? a. 1 to 5% b. 4 to 10% c. 10 to 12%
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8) Steam pressure in a steam power station, which is usually kept now-a-days is of the order of____________? a. 20 kgf/cm2 b. 50 kgf/cm2 c. 100 kgf/cm2 d. 150 kgf/cm2
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9) Load center in a power station is___________? a. center of coal fields b. center of maximum load of equipments c. center of gravity of electrical system
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10) The efficiency of a modern boiler using coal and heat recovery equipment is about_____________? a. 25 to 30% b. 40 to 50% c. 65 to 70% d. 85 to 90%
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11) The maximum length of a screw conveyer is about___________? a. 30 metres b. 40 metres c. 60 metres d. 100 metres
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12) Belt conveyer can be used to transport coal at inclinations upto____________? a. 30° b. 60° c. 80° d. 90°
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13) Steam turbines commonly used in steam power station are__________? a. condensing type b. non-condensing type c. none of the above
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14) For the safety of a steam boiler the number of safety valves fitted are____________? a. four b. three c. two d. one
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15) Pipes carrying steam are generally made up of_____________? a. steel b. cast iron c. copper d. aluminium
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16) Evaporative type of condenser has___________? a. steam in pipes surrounded by water b. water in pipes surrounded by steam c. either A. or (b) d. none of the above
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17) In a regenerative surface condenser_____________? a. there is one pump to remove air and condensate b. there are two pumps to remove air and condensate c. there are three pumps to remove air, vapour and condensate d. there is no pump, the condensate gets removed by gravity
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18) In a steam power plant, the function of a condenser is__________? a. to maintain pressure below atmospheric to increase work output from the primemover b. to receive large volumes of steam exhausted from steam prime mover c. to condense large volumes of steam to water which may be used again in boiler d. all of the above
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19) Edward’s air pump____________? a. removes air and also vapour from condenser b. removes only air from condenser c. removes only un-condensed vapour from condenser d. removes air alongwith vapour and also the condensed water from condenser
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20) The cooling section in the surface condenser__________? a. increases the quantity of vapour extracted along with air b. reduces the quantity of vapour extracted along with air c. does not affect vapour quantity extracted but reduces pump capacity of air extraction pump d. none of the above
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