Wet bulb and dry bulb temperatures becomes identical at __________ percent saturation curve.

The wet bulb temperature is lower in dry air than in wet air at the same temperature. A dry bulb thermometer registers a higher temperature than a wet bulb thermometer except at __________ percent relative humidity.

A

0

B

100

C

50

D

None of these

When the psychometric ratio is __________ then the adiabatic saturation temperature and wet bulb temperature becomes equal.

A

1

B

> 1

C

$$\infty $$

Dry bulb temperature of the gas is __________ the wet bulb temperature.

A

Less than

B

More than

C

Equal to

D

None of these

The difference between dry bulb temperature and wet bulb temperature, is called

A

Dry bulb depression

B

Wet bulb depression

C

Dew point depression

D

Degree of saturation

The difference of wet bulb temperature and adiabatic saturation temperature of unsaturated mixture of any system is

A

+ve

B

-ve

C

Zero

D

None of these

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

Fresh grapes contain 80 percent water while dry grapes contain 10 percent water. If the weight of the dry grapes is 250 kg what is total weight when it was fresh?

A

1000 kg

B

1100 kg

C

1125 kg

D

1225 kg

A 40 W bulb is connected in series with a room heater. If now 40 W bulb is replaced by 100 W bulb, the heater output will

A

decrease

B

increase

C

remain same

D

heater will burn out

Ponchon Savarit method is based on the use of enthalpy concentration diagram, which contains the bubble point curve (saturated liquid curve), dew point curve (saturated vapour curve) and equilibrium tie lines. As compared to McCabe-Thiele's method, this method

A

Is more accurate in finding the number of equilibrium stages

B

Accounts for the enthalpy changes in the process

C

Facilitates direct calculation of heat load on reboiler & condenser from, the diagram used in this method

D

All of the above

In case of an unsaturated mixture of gas and vapor, the percentage saturation is __________ its relative saturation.

A

Lower than

B

Higher than

C

Equal to

D

Either A or B, depends on the mixture composition

Wet bulb and dry bulb temperatures becomes identical at __________ percent saturation curve.

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