A. 15%
B. 20%
C. 30%
D. 45%
E. 60%.
Thermal efficiency of a thermal power plant is of the order of___________________? Read More »
Engines, Nozzles and Turbines, Steam Boilers A. one-fourth
B. half
C. one
D. two
E. three
The radius of a dished head is taken approximately as______________________? Read More »
Engines, Nozzles and Turbines, Steam Boilers A. boiler efficiency, turhine efficiecny, generator efficiency
B. all the three above plus gas cycle efficiency
C. carnot cycle efficiency
D. regenerative cycle efficiency
E. rankine cycle efficiency
The overall efficiency of thermal power plant is________________? Read More »
Engines, Nozzles and Turbines, Steam Boilers 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 furnace
D. water is converted into steam in one pass without any recirculation
E. water is heated in a large number of tubes
In forced circulation type boiler__________________? Read More »
Engines, Nozzles and Turbines, Steam Boilers 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 fuel
D. radiation
E. all of the above
The heat loss in a boiler takes place in the form of________________? Read More »
Engines, Nozzles and Turbines, Steam Boilers A. lancashire boiler
B. locomotive boiler
C. babcock and wilcox boiler
D. cochran boiler
E. benson boiler
A. droog characteristic
B. linear characterisstic
C. rising characteristic
D. flat characteristic
C. none of the above
With increase in load, convection superheater has_______________________? Read More »
Engines, Nozzles and Turbines, Steam Boilers A. from a metal wall from one medium to another
B. from heating an itermediate material and then heating the air from this material
C. by direct mixing ,
D. heat is transferred by bleeding some gases from furnace
E. none of the above
In a recuperative air preheater, the heat is transferred____________________? Read More »
Engines, Nozzles and Turbines, Steam Boilers A. 100°C
B. above dew-point temperature of flue gases
C. below dew-point temperature of flue gases
D. less than wet bulb temperature of flue gases
E. above wet bulb temperature of flue gases
The temperature of flue gases at air heater outlet should be__________________? Read More »
Engines, Nozzles and Turbines, Steam Boilers A. approach temperature should be as low as possible
B. handling and maintenance should be easier
C. heat transfer area should be optimum
D. stack gases should not be cooled to the dew point
E. none of the above
In designing air preheater, the important design consideration is that_________________? Read More »
Engines, Nozzles and Turbines, Steam Boilers