The ultimate analysis of coal gives
A.carbon hydrogen and ash
B.volatile matter moisture ash and fixed carbon
C.carbon hydrogen sulphur and nitrogen
D.volatilematter mositure nitrogen and fixed carbon
Category: Fuels and Combustion Mcqs
The dew point of the flue gases
A.decreases with decrease in C/H ratio of a fuel
B.decreases with increase in C/H ratio of fuel
C.is independent of C/H ration of a fuel
D.decreases with decrease in excess air
Production of flue gas as kg/kg of furnace oil at about 40% excess air will aproximately be
A.1.5 times
B.1 time
C.20 times
D.50 times
Heating value of liquid fuels in Btu/1b
A.decreases with decrease in specific gravity
B.increases with decrease in specific gravity
C.remains constant with change in specific gravity
D.increases with decrease in degree API.
A reading of 100% on the explosivementer would mean that the concentration of the combustible gas was 100% of the lowerlimit that is the concentration would be
A.1/4 the amount necessary to cause an explosion
B.1/2 the amount necessary to cause an explosion
C.1/10 the amount necessary to cause an explosion
D.sufficient to cause an explosion
The adiabatic flame temperatures of pentane and hydrogen are Tp and Th ?C. The difference Tp-Th is always
A.zero
B.negative
C.positive
How many cubic foot of oxygen is required for the complete and perfect combustion of one cubic foot of methane?
A.one cubic foot
B.two cubic foot
C.one and half cubic foot
D.three cubic foot
Actual flame temperature is always lower than the adiabatic flame temperature because
A.there is always loss of heat from the flame
B.it is impossible to obtain complete combustion at high temperature
C.both (a) and (b)
D.neither (a) nor (b)
Which sequence is followed for the flue-gas analysis in the Orsat gas analyzer?
A.O2 CO CO2
B.O2 CO2 CO
C.CO O2 CO2
D.CO2 O2 CO
Control of incomplete combustion loss would mean
A.decreasing the amount of excess air
B.increasing the amount of excess air
C.increasing the fuel/air ratio
D.to decrease moisture loss
