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

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

Shweta has connected a cell with a bulb. The bulb didn't glow. What could be the reasons? A. Bulb was connected by the positive terminal from both ends. B. One end of the bulb was connected with a positive terminal and another end was connected with a negative terminal. C. Bulb was connected by the negative terminal from both ends D. Bulb was fuse.

A

B, C

B

A,B and D

C

A,C

D

A, C, D

Relative humidity is given by (where pv = Partial pressure of water vapour, pb = Barometric pressure, ps = Pressure of saturated air, pd = Pressure at dry bulb temperature, pw = Saturation pressure corresponding to wet bulb temperature, and μ = Degree of saturation)

A

0.622 Pv / (Pb - Pv)

B

μ/[1 - (1 - μ) (Ps/Pb)]

C

[Pv (Pb - Pd)]/ [Pd (Pb - Pv)]

D

None of these

Relative humidity is given by (where p_v = Partial pressure of water vapour, p_b = Barometric pressure, p_s = Pressure of saturated air, p_d = Pressure at dry bulb temperature, p_w = Saturation pressure corresponding to wet bulb temperature and $$\mu $$ = Degree of saturation)

A

$$\frac{{0.622{{\text{p}}_{\text{v}}}}}{{{{\text{p}}_{\text{b}}} - {{\text{p}}_{\text{V}}}}}$$

B

$$\frac{\mu }{{1 - \left( {1 - \mu } \right)\frac{{{{\text{p}}_{\text{s}}}}}{{{{\text{p}}_{\text{b}}}}}}}$$

C

$$\frac{{{{\text{p}}_{\text{v}}}\left( {{{\text{p}}_{\text{b}}} - {{\text{p}}_{\text{d}}}} \right)}}{{{{\text{p}}_{\text{d}}}\left( {{{\text{p}}_{\text{b}}} - {{\text{p}}_{\text{v}}}} \right)}}$$

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

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

A

100

B

50

C

78

D

None of these

The wet and dry bulb temperature for a vapour-gas mixture are 25°C and 30°C respectively. If the mixture is heated to 45°C at constant pressure, the wet bulb temperature will be __________ °C.

A

25

B

> 25

C

- 25

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

The statement concern psychrometric chart. 1. Constant relative humidity lines are uphill straight lines to the right 2. Constant wet bulb temperature lines are downhill straight lines to the right. 3. Constant specific volume lines are downhill straight lines to the right. 4. Constant enthalpy lines are coincident with constant wet bulb temperature lines. Which of the statements are correct?

A

2 and 3

B

1 and 2

C

1 and 3

D

2 and 4

During adiabatic saturation process of air, wet bulb temperature ___________

A

Increases and dry bulb temperature remains constant

B

Remains constant and dry bulb temperature increases

C

Remains constant and dry bulb temperature decreases

D

Decreases and dry bulb temperature remains constant

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

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