Mechanical Engineering MCQs

Page No. 3

In a recuperative air preheater, the heat is transferred____________________?


afrom a metal wall from one medium to another

✓


bfrom heating an itermediate material and then heating the air from this material

✖


cby direct mixing ,

✖


dheat is transferred by bleeding some gases from furnace

✖



The temperature of flue gases at air heater outlet should be__________________?


a100°C

✖


babove dew-point temperature of flue gases

✓


cbelow dew-point temperature of flue gases

✖


dless than wet bulb temperature of flue gases

✖



In designing air preheater, the important design consideration is that_________________?


aapproach temperature should be as low as possible

✖


bhandling and maintenance should be easier

✖


cheat transfer area should be optimum

✖


dstack gases should not be cooled to the dew point

✓



The function of injector used in small capacity boilers is to____________________?


acreate vacuum

✖


binject chemical solution in feed pump

✖


cpump water, similar to boiler feed pump

✓


dadd make up water in the system

✖



The height of chimney in a power plant is governed by__________________?


athe draft to be created

✖


blimitation of construction facilities

✖


ccontrol of pollution

✓


dquantity of flue gases to be handled

✖


View Answer control of pollution

Vacuum for reciprocating steam engines compared to steam turbines is__________________?


amore

✖


bequal

✖


cless

✓


dcould be more or less depending on the size of plant

✖


View Answer less

In locomotives, the draught is produced by_________________?


achimney

✖


binduced draft fan

✖


cboth combined A. and B.

✖


dsteam jet draught

✓


View Answer steam jet draught

The maximum discharge through a chimney occurs when the height of chimney is_____________________?


ainfinitely long

✖


baround 200 meters

✖


cequal to the height of the hot gas column producing draught

✓


doutside temperature is very low

✖



Which device is used in thermal power plants to reduce level of pollution___________________?


ainduced draft fan

✖


bsmoke meter

✖


cchimney

✖


dprecipitator

✓


View Answer precipitator

Ultimate analysis of fuel is determination of percentage of____________________?


acarbon, hydrogen, nitrogen, sulphur, moisture

✓


bfixed carbon, ash, volatile matter, moisture

✖


chigher calorific value

✖


dlower calorific value

✖



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