Mechanical Engineering MCQs

Page No. 5

The three “Ts” for good combustion are____________________?


atemperature, time, and turbulance


btotal air, true fuel, and turbulance


cthorough mixing, total air, and temperature


dtotal air, time, and temperature



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


ahigher effectiveness of boiler


bhigh calorific value coal being burnt


cfouling of heat transfer surfaces


draising of steam temperature



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


asame


bmore


cless


dless or more depending on size of boiler


View Answer more

Feed water conditioning in thermal power plants in done to__________________?


areduce hardness and for removal of solids


bincrease efficiency-of thermal power plant


cincrease *heat transfer rate


dall of the above


View Answer all of the above

Boiler parameters are expressed by ___________________?


atonnes/hr. of steam


bpressure of steam in kg/cm2


ctemperature of steam in °C


dall of the above


View Answer all of the above

Calorific value of coal is of the order of _______________________?


a200-400 kcal/kg


b800-1200 kcal/kg


c2000-4000 kcal/kg


d5000-8000 kcal/kg


View Answer 2000-4000 kcal/kg

The condition of steam in boiler drum is always ___________________?


adry


bwet


csaturated


dsupersaturated


View Answer wet

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


aremain unaffected


bimprove C. worsen


cmay improve/worsen depending on size


dunpredictable



Overfire burning is the phenomenon of _____________________?


asupply of excess, air


bsupply of excess coal


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


dfuel bed firing



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


acavitation of .boiler feed pumps


bcorrosion caused by oxygen


cheat transfer coefficient


dpH value of water



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