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51.

Moisture loss is determined by

A.	the moisture content of the fuel	B.	the humidity of air used for combustion
C.	the moisture content of the fuel and the jumidity of air used for combustion	D.	the water formed by combustion reaction

52.

With no excess air flue gas from the complete and perfect combusion of methane world contain

A.	11.7% N2 and 88.3% CO2 by volume	B.	11.7% CO2 and 88.3% N2 by volume
C.	24.8% CO2 and 75.2% N2 by volume	D.	24.8% N2 and 75.2% CO2 by volume

53.

Under actual combustion conditions unless there is sufficient excess air the flue gas contains

A.	carbon monoxide	B.	carbon dioxide
C.	oxygen nitrogen	D.	all of these answers

54.

As the carbon-hydrogen ration of the fuel increases.

A.	The amount of CO2 formed decreases for the same % of excess air	B.	The amount of CO2 formed increases for the same % of excess air
C.	the amount of energy liberated by the combustion decreasesfor the same % of excess air	D.	the amount of CO2 formed remains constant for the same % of excess air.

55.

If the O2 concentration of the flue gas rises too high fuel is being wasted by

A.	incomplete combustion	B.	dry-gas or stack loss
C.	moisture loss	D.	none of these answers

56.

If the oxygen concentration of flue gas is too low

A.	the amount of excess air should be decreased	B.	the amount of excess air should be increased
C.	the amount of excess air should be kept constant	D.	there is dry-gas or stack loss

57.

The most important instrument for complete flue-gas analysis is the Orsat gas analyzer. The Orsat analyzes flue gases by the process of

A.	adsorption	B.	distillation
C.	evaporation	D.	absorption

58.

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

59.

The potassium hydroxide solution absorbs

A.	CO2 as well as CO	B.	CO2 as well as O2
C.	CO2 O2 and CO	D.	CO2 as well as SO2

60.

The pyrogallol solution absorbs

A.	CO2 as well as CO	B.	CO2 as well as O2
C.	CO2 CO and O2	D.	CO as well as O2