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Standard XII

Physics

Zeroth Law of Thermodynamics

Moist air und...

Question

Moist air undergoes a process of adiabatic saturation followed by cooling, in this process wet bulb temperature

Increases

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May increase or decrease

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Decreases

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Remains constant

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Solution

The correct option is C Decreases

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Similar questions

Q. The temperature of air entering an adiabatic saturator is

42^{\circ}

and that of the air leaving is

30^{\circ}

C.
The humidity ratio (kg/kg d.a) of the entering air is
Use the following relation:

P_{v} P_{w} - \frac{(P - P_{w}) (T_{d b} - T_{w b}) (1.8)}{2800 - 1.3 (1.8 T_{d b} + 32)}

where P = total air pressure (kPa)

P_{v}

= partial pressure of water vapour (kPa)

P_{w}

= saturation pressure of water vapour corresponding to wet bulb temperature (kPa)

T_{d b}

= dry-bulb temperature

(^{^{\circ} C})

T_{w b}

= Wet -bulb temperature

(^{^{\circ} C})

Use the following data:

T $(^{^{\circ} C})$	30	34	38	42
P(kPa)	4.246	4.753	6.624	8.20

Q. A rigid diatomic ideal gas undergoes an adiabatic process at room temperature,. The relation between temperature and volume of this process is

T V^{x}

= constant, then

x

is :

Q. Wet bulb depression, under saturated ambient air conditions:

When a poly atomic gas undergoes an adiabatic process, its temperature and volume are related by the equation $T V^{n}$ =constant, the value of n will be

Q. Water at

42^{\circ} C

is sprayed into a stream of air at atmospheric pressure, dry bulb temperature of

40^{\circ}

and a wet bulb temperature of

20^{\circ}

. The air leaving the spray humidifier is not saturated. Which of the following statements is true?

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