The ratio of maximum adiabatic flame temperature in air to that in pure oxygen is always

The maximum adiabatic flame temperature in air is __________ the maximum flame temperature in pure oxygen.

A

Lower than

B

Higher than

C

Same as

D

Not related to

The maximum adiabatic flame temperature of fuels in air is __________ the maximum flame temperature in pure oxygen.

A

Lower than

B

Higher than

C

Same as

D

Not related to

The maximum adiabatic flame temperature in air as compared to that in pure oxygen is

A

Much lower

B

Much higher

C

Same

D

Either lower or higher, depends on the type of fuel

Actual flame temperature is always lower than the adiabatic flame temperature, because there is

A

No possibility of obtaining complete combustion at high temperature

B

Always loss of heat from the flame

C

Both A & B

D

Neither A nor B

Given that, 24 carat gold is pure gold, 18 carat gold is 3/4th of pure gold and 20 carat gold is 5/6th of pure gold, the ratio of the pure gold in 18 carat gold to the pure gold in 20 carat gold is -

A

5 : 8

B

10 : 9

C

8 : 5

D

9 : 10

For the case of a fuel gas undergoing combustion with air, if the air/fuel ratio is increased, the adiabatic flame temperature will

A

Increase

B

Decrease

C

Increase or decrease depending on the fuel type

D

Not change

The maximum adiabatic flame temperature is attained, when the fuel is burnt with

A

Theoretically required amount of air

B

More than theoretically required amount of air

C

Less than theoretically required amount of air

D

Theoretically required amount of oxygen

Adiabatic flame temperature of a fuel is dependent on the initial temperature of

A

Fuel

B

Air

C

Both A & B

D

Neither A nor B

With increase in calorific value of fuels, their adiabatic flame temperatures

A

Increase

B

Decrease

C

Remain unchanged

D

May increase or decrease ; depends on the quantity of products of combustion

For the air water system under ambient conditions, the adiabatic saturation temperature and the wet bulb temperature are nearly equal, because

A

Water has a high latent heat of evaporation

B

Lewis number is close to unity

C

They are always equal under all circumstances

D

Solubility of the components of air in water is very small

The ratio of maximum adiabatic flame temperature in air to that in pure oxygen is always

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