Mechanical Engineering MCQs

Page No. 5

The three “Ts” for good combustion are____________________?


atemperature, time, and turbulance

✓


btotal air, true fuel, and turbulance

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cthorough mixing, total air, and temperature

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dtotal air, time, and temperature

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Gardually increasing temperature of flue gases at inlet to chimney for given steam outputs is an indication of__________________?


ahigher effectiveness of boiler

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bhigh calorific value coal being burnt

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cfouling of heat transfer surfaces

✓


draising of steam temperature

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The capacity of induced draft fan compared to forced draft fan in a boiler is__________________?


asame

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bmore

✓


cless

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dless or more depending on size of boiler

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View Answer more

Feed water conditioning in thermal power plants in done to__________________?


areduce hardness and for removal of solids

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bincrease efficiency-of thermal power plant

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cincrease *heat transfer rate

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dall of the above

✓


View Answer all of the above

Boiler parameters are expressed by ___________________?


atonnes/hr. of steam

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bpressure of steam in kg/cm2

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ctemperature of steam in °C

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dall of the above

✓


View Answer all of the above

Calorific value of coal is of the order of _______________________?


a200-400 kcal/kg

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b800-1200 kcal/kg

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c2000-4000 kcal/kg

✓


d5000-8000 kcal/kg

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View Answer 2000-4000 kcal/kg

The condition of steam in boiler drum is always ___________________?


adry

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bwet

✓


csaturated

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dsupersaturated

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View Answer wet

In ordetjo obtain superheated steam, a superheater is added in an existing boiler. As as result, furnace vacuum will _________________?


aremain unaffected

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bimprove C. worsen

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cmay improve/worsen depending on size

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dunpredictable

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Overfire burning is the phenomenon of _____________________?


asupply of excess, air

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bsupply of excess coal

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cburning CO and unburnts in upper zone of furnace by supplying more air

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dfuel bed firing

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Deaeration of feed water is carried out because it reduces ____________________?


acavitation of .boiler feed pumps

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bcorrosion caused by oxygen

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cheat transfer coefficient

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dpH value of water

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