⚙️Mechanical Engineering MCQs
Mechanical Engineering MCQs
488 MCQs441
The feed check valve is used in order to ______________________?
Aregulate flow of boiler water
Bcheck level of water in boiler drum
Crecirculate unwanted feed water
Dallow high pressure feed water to flow to drum and not allow reverse flow to take place E. none of the above
442
In water wall furnace, the heat is transferred to the water-walls by _________________?
Aconvection
Bradiation
Cconduction
Dradiation and conducton E. radiation and convection
443
Fire tube boilers are limited to a maximum design working pressure of ____________________?
A1 kg/cm
B6 kg/cm
C17 kg/cm2
D100 kg/cm2 E. 250 kg/cm2
444
The condition of steam in boiler drum is always ___________________?
Adry
Bwet
Csaturated
Dsupersaturated E. superheated
445
In ordetjo obtain superheated steam, a superheater is added in an existing boiler. As as result, furnace vacuum will _________________?
Aremain unaffected
Bimprove
Cmay improve/worsen depending on size
Dunpredictable
446
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 E. none of the above
447
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 E. weight of water to be handled
448
Natural water circulation, by convection in water tube boilers, with increase in pressure of boiler _________________?
Aincreases
Bdecreases
Cremains unaffected
Dfirst increases and then decreases E. first decreases and then increases
449
During storage, the heating value of coal __________________?
Aincreases
Bdecreases
Cremains constant
Dmay increase or decrease depending upon the method of storage E. none of the above
450
Film boling occurs at _______________________?
Avery low pressure
Batmospheric pressures
Cmedium pressures
Dvery high pressures E. none of the above