Steam Boilers, Engines, Nozzles and Turbines
The temperature of flue gases at air heater outlet should be

Below dew point temperature of flue gases
Above dew point temperature of flue gases
100°C
Less than wet bulb temperature of flue gases

ANSWER DOWNLOAD EXAMIANS APP

Steam Boilers, Engines, Nozzles and Turbines
Spontaneous combustion is a phenomenon in which

Coal bursts into flame without any external ignition source but by itself due to gradual increase in temperature as a result of heat released by combination of oxygen with coal
Fuel burns with less air
All the fuel burns instantaneously producing high energy release
Explosion in furnace

ANSWER DOWNLOAD EXAMIANS APP
MORE MCQ ON Steam Boilers, Engines, Nozzles and Turbines