Sulphur in coal results in___________________?
(A) causing clinkering and slagging
(B) corroding air heaters
(C) spontaneous combustion during coal storage
(D) facilitating ash precipitation
(D) all of the above
Green coal, in order to be burnt, must be____________________?
(A) heated sufficiently
(B) burnt in excess air
(C) heated to its ignition point
(D) burnt as powder
(D) burnt as lumps
In which of the following boilers, the draught in furnace is increased by utilising exhaust steam from engine__________________?
(A) lancashire boiler
(B) locomotive boiler
(C) babcock and wilcox boiler
(D) cochran boiler
(D) benson boiler
With increase in load, convection superheater has_______________________?
(A) drooping characteristic
(B) linear characterisstic
(C) rising characteristic
(D) flat characteristic
In a recuperative air preheater, the heat is transferred____________________?
(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
(D) none of the above
The temperature of flue gases at air heater outlet should be__________________?
(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
(D) above wet bulb temperature of flue gases
In designing air preheater, the important design consideration is that_________________?
(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
(D) none of the above
The function of injector used in small capacity boilers is to____________________?
(A) create vacuum
(B) inject chemical solution in feed pump
(C) pump water, similar to boiler feed pump
(D) add make up water in the system
(D) none of the above
The height of chimney in a power plant is governed by__________________?
(A) the draft to be created
(B) limitation of construction facilities
(C) control of pollution
(D) quantity of flue gases to be handled
(D) all of the above
Vacuum for reciprocating steam engines compared to steam turbines is__________________?
(A) more
(B) equal
(C) less
(D) could be more or less depending on the size of plant
(D) none of the above