Steam Boilers, Engines, Nozzles and Turbines In recuperative air preheaters, the heat is transferred Heat is transferred by bleeding some gases from furnace By direct mixing From a metal wall from one medium to another From heating an intermediate material and then heating the air from this material Heat is transferred by bleeding some gases from furnace By direct mixing From a metal wall from one medium to another From heating an intermediate material and then heating the air from this material ANSWER DOWNLOAD EXAMIANS APP
Steam Boilers, Engines, Nozzles and Turbines The ratio of the energy required to produce the artificial draught (expressed in meters head or J/kg of flue gas) to the mechanical equivalent of extra heat carried away per kg of flue gases due to natural draught, is known as Efficiency of the chimney Efficiency of the fan Efficiency of the boiler Power of the boiler Efficiency of the chimney Efficiency of the fan Efficiency of the boiler Power of the boiler ANSWER DOWNLOAD EXAMIANS APP
Steam Boilers, Engines, Nozzles and Turbines During polytropic process Steam may be wet, dry or superheated after expansion Work is done All of these Heat transfer takes place across cylinder walls Steam may be wet, dry or superheated after expansion Work is done All of these Heat transfer takes place across cylinder walls ANSWER DOWNLOAD EXAMIANS APP
Steam Boilers, Engines, Nozzles and Turbines Water tube boilers are those in which Work is done during adiabatic expansion Water passes through the tubes and flue gases around it Change in enthalpy Flue gases pass through tubes and water around it Work is done during adiabatic expansion Water passes through the tubes and flue gases around it Change in enthalpy Flue gases pass through tubes and water around it ANSWER DOWNLOAD EXAMIANS APP
Steam Boilers, Engines, Nozzles and Turbines The natural draught is produced by Centrifugal fan Both (A) and (B) Steam jet Chimney Centrifugal fan Both (A) and (B) Steam jet Chimney ANSWER DOWNLOAD EXAMIANS APP
Steam Boilers, Engines, Nozzles and Turbines Hard coke is produced by carburization of coal at 950-1100°C 700-850°C Atmospheric temperature 500-600°C 950-1100°C 700-850°C Atmospheric temperature 500-600°C ANSWER DOWNLOAD EXAMIANS APP
EXAMIANS