Related Questions

Draught produced by a tall chimney due to density difference between hot flue gas inside the Chimney and atmospheric air outside the chimney is more appropriately known as the __________ draught.
A Natural
B Induced
C Forced
D Chimney
Thermal conductivity based continuous flue gas analyser makes use of varying thermal conductivity of the constituents of flue gases. Which of the following constituents of flue gases has the maximum thermal conductivity?
A CO2
B N2
C O2
D CO
White smoke coming out of the chimney of a furnace indicates the use of
A Low excess air
B Very high excess air
C Gaseous fuel in the furnace
D Liquid fuel in the furnace
Flue gas discharge velocity through chimney of a big thermal power plant may be around __________ m/sec.
A 0.5
B 500
C 10
D 50
Black smoke coming out of the chimney of a furnace is an indication of the use of __________ in the furnace.
A Low amount of excess combustion air
B Large quantity of excess combustion air
C Hydrocarbon fuel
D Pulverised coal as fuel
Oxygen percentage in the flue gas coming out of a gaseous fuel fired furnace should be ideally about __________ percent.
A [

A.

B.

Flue gas outlet temperature from the chimney of any furnace should be ideally about __________ °C.
A 50
B 100
C 150
D 250
Emission of dense white smoke out of the chimney of a thermal power plant is an indication of the use of
A Less air for combustion
B Correct amount of air for combustion
C Too much air for combustion
D Pulverised coal in boilers
A _________ in a boiler is used to put off fire in the furnace of the boiler when the level of water in the boiler falls to an unsafe limit.
A Blow off cock
B Fusible plug
C Stop valve
D Safety valve
Gradually increasing temperature of flue gases at inlet to chimney for given steam outputs is an indication of
A Higher effectiveness of boiler
B High calorific value coal being burnt
C Fouling of heat transfer surfaces
D Raising of steam temperature

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