A. 15%
B. 20%
C. 30%
D. 45%
E. 60%.
Month: January 2019
A. one-fourth
B. half
C. one
D. two
E. three
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
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
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
A. lancashire boiler
B. locomotive boiler
C. babcock and wilcox boiler
D. cochran boiler
E. benson boiler
A. drooping characteristic
B. linear characterisstic
C. rising characteristic
D. flat characteristic
C. none of the above
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
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
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
