Steam Boiler Engines Nozels And Turbines Mcqs
Q.1: Which is not correct statement about effect of sulphur in fuel ___________________?S
A. it has heating value
B. it helps in electrostatic precipitation of ash in flue-gases<
C. it leads to corrosion of air heaters, ducting, etc. if flue gas exit temperature is lowW
D. it erodes furnace walls
Q.2: Which is not the correct statement about moisture in coal ______________________?Q
A. inherent moisture and surface moisture are different things=
B. in some coals moisture may be present upto 40%.
C. some moisture in coal helps in better burning which is not possible with completely dry coal\
D. it increases thermal efficiency
Q.3: Which is not correct statement about the function of furnace____________________?Q
A. to provide proper conditions for con-tinuous complete combustion@
B. mix fuel with air and ignite
C. separate ash from coal
D. maintain heat supply to prepare and ignite the incoming fuel<
Q.4: Which is not correct statement about pulverised fuel firing ?=
A. high burning rate is possible
B. heat release can be easily controlled%
C. fuel burns economically
D. it is the best technique for burning high ash content fuel having low fusion ashP
Q.5: Pick up wrong statement about desired properties of a good fuel__________________?R
A. high calorific value
B. produce minimum smoke and gases
C. ease in storing
D. high ignition point
Q.6: Thermal efficiency of a thermal power plant is of the order of___________________?R
A. 15%
B. 20%
C. 30%
D. 45%
Q.7: The radius of a dished head is taken approximately as______________________?L
A. one-fourth
B. half
C. one
D. two
Q.8: The overall efficiency of thermal power plant is________________?A
A. boiler efficiency, turhine efficiecny, generator efficiency;
B. all the three above plus gas cycle efficiency-
C. carnot cycle efficiency
D. regenerative cycle efficiency
Q.9: In forced circulation type boiler__________________?4
A. heating 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
B. water 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
C. feed pump is employed to supplement natural circulation in water wall type furnaceR
D. water is converted into steam in one pass without any recirculationC
Q.10: The heat loss in a boiler takes place in the form of________________?E
A. heat carried away by flue gases
B. heat carried away by ash
C. moisture present in fuel and steam formed by combustion of hydrogen in fuelK
D. radiation

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