⚙️Mechanical Engineering MCQs
Mechanical Engineering MCQs
488 MCQs421
Which is not correct statement about the function of furnace____________________?
Ato provide proper conditions for con-tinuous complete combustion
Bmix fuel with air and ignite
Cseparate ash from coal
Dmaintain heat supply to prepare and ignite the incoming fuel E. to minimise radiation losses
422
Which is not correct statement about pulverised fuel firing ?
Ahigh burning rate is possible
Bheat release can be easily controlled
Cfuel burns economically
Dit is the best technique for burning high ash content fuel having low fusion ash E. separate mills are required to powder the coal
423
Pick up wrong statement about desired properties of a good fuel__________________?
Ahigh calorific value
Bproduce minimum smoke and gases
Cease in storing
Dhigh ignition point E. ecomomical
424
Thermal efficiency of a thermal power plant is of the order of___________________?
A15%
B20%
C30%
D45% E. 60%.
425
The radius of a dished head is taken approximately as______________________?
Aone-fourth
Bhalf
Cone
Dtwo E. three
426
The overall efficiency of thermal power plant is________________?
Aboiler efficiency, turhine efficiecny, generator efficiency
Ball the three above plus gas cycle efficiency
Ccarnot cycle efficiency
Dregenerative cycle efficiency E. rankine cycle efficiency
427
In forced circulation type boiler__________________?
Aheating takes place at bottom and the water supplied at bottom gets converted into the mixture of steam bubbles and hot water which rise to drum
Bwater is supplied in drum and through down-comers located in atmospheric condition it passes to the water wall and rises to drum in the form of mixture of water and steam
Cfeed pump is employed to supplement natural circulation in water wall type furnace
Dwater is converted into steam in one pass without any recirculation E. water is heated in a large number of tubes
428
The heat loss in a boiler takes place in the form of________________?
Aheat carried away by flue gases
Bheat carried away by ash
Cmoisture present in fuel and steam formed by combustion of hydrogen in fuel
Dradiation E. all of the above
429
In which of the following boilers, the draught in furnace is increased by utilising exhaust steam from engine__________________?
Alancashire boiler
Blocomotive boiler
Cbabcock and wilcox boiler
Dcochran boiler E. benson boiler
430
With increase in load, convection superheater has_______________________?
Adrooping characteristic
Blinear characterisstic
Cnone of the above
Dflat characteristic