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81.

Select the correct statement

A.	1 litre of LPG will produce lower quantity of heat than 1 litre of kerosine	B.	1 litre of LPG will produce greater quantity of heat than 1 litre of kerosine
C.	1 litre of LPG and 1 litre of kerosine will produce equal quantity of heat	D.	1 kg of LPG will produce lower quantity of heat than 1 kg of furnace oil.

82.

Select the correct statement

A.	Heating value of light paraffinic oil fuels is lower than that of equivalent olefins	B.	Heating value of light paraffinic oil fuels is higher than that of equivalent olefins
C.	Heating value of light paraffinic oil fuels is equal to that of equivalent olefins	D.	Heating value of n-paraffins is lower than that of isoparaffins of the same compounds.

83.

Select the correct statement

A.	Combustion is any unit process in which the oxidation reaction takes place	B.	Oxidation of toluene to benzaldehyde is a combustion process
C.	Oxidation of hydrogen chloride to chlorine is a combustion process	D.	Combustion is that unit process in which oxidation reaction takes place as the union of carbon hydrogen and sulphur with oxygen

84.

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

85.

Theoretical flame temperature is the temperature attained

A.	when a fuel is burned in air	B.	when a fuel is burned in oxygen
C.	when a fuel is burned in air or oxygen	D.	when a fuel is burned in air or oxygen without gain or loss of heat

86.

The maximum adiabatic flame temperature is attained when the fuel is burned with

A.	the theoretically required amount of air	B.	the theoretically required amount of pure oxygen
C.	more than the theoretically required amount of pure oxygen	D.	less than the theoretically required amount of pure oxygen

87.

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)

88.

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

89.

The ratio of the maximum adiabatic flame temperature in air to the maximum adiabatic temperature in pur oxygen is always

A.	equal to one	B.	much less than one
C.	much greater than one

90.

At a given temperature the enthalpy is the highest for

A.	CO2	B.	air
C.	SO2	D.	H2O