Engineering :: Fuels and Combustion

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31.

A reading of 100% on the explosivementer means that the concentration of combustible gas is

A.	less than the lower limit of explosibility	B.	equal to the lower limit of explosibility
C.	higher than the lower limit of explosibility	D.	both (b) and (c)

32.

Which one is the most dangerous gas?

A.	Hydrogen	B.	Methane
C.	Ethane	D.	Butane

33.

If a gas is in the flammable range of concentration

A.	it will not explode at all	B.	it will explode always without requiring heat energy
C.	it will not explode unless a source of heat starts the reaction	D.	none of these answers

34.

The gross heat of combustion is

A.	the heat directly released by combustion	B.	the heat released by cooling down all combustion products to the temperature before combustion
C.	the latent heat of condensation of the water formed	D.	all of these answers

35.

One of the products formed by combustion of the hydrocarbon fuels is water which is in the

A.	solid state	B.	liquid state
C.	gaseous state	D.	solid liquid and gaseous states

36.

The net heat of combustion of the hydrocarbon fuels is

A.	equal to the gross heat of combustion of the hydrocarbon fuels	B.	greater than the gross heat of combustion of the hydrocarbon fuels
C.	equal to the gross heat of combustion minus the latent heat of condensation of the water formed during the combustion reaction	D.	equal to the latent heat of condensation of the water formed during the combustion reaction.

37.

The complete and perfect combustion of a hydrocarbon fuel yields

A.	carbon monoside gas and water vapour	B.	carbon dioxide gas only
C.	water vapour only	D.	both carbon dioside gas and water vapour

38.

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

39.

The oxygen for fuel combustion comes from the air which consists of about

A.	21% oxygen and 79% nitrogen by volume	B.	21% oxygen and 79% nitrogen by weight
C.	79% oxygen and 21% nitrogen by volume	D.	79% oxygen and 21% nitrogen by weight

40.

How many cubic foot of air is required for the complete and perfect combustion of one cubic foot of methane

A.	2.0 cu. Ft.	B.	3.0 cu. Ft.
C.	7.5 cu. Ft.	D.	9.52 cu. Ft.