Consider the following statements:
A psychrometer measures
1. Wet bulb temperature
2. dew point temperature
3. dry bulb temperature

Which of these statements is/are correct?

Q. Consider the following statements :

In psychrometry, wet-bulb temperature is a pressure of enthalpy of moist air, so that in the psychrometric chart.

1. The constant enthalpy lines are also constant wet bulb temperature lines.

2. The wet bulb and dry-bulb temperature are same at any condition.

3. The wet bulb and dry bulb temperature are equal at saturation condition.

Which of these statements is/are correct?

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?

Q. When do a wet and dry bulb psychrometer determine relative humidity?

Q. The statements 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?

Q. Air (at atmospheric pressure) at a dry bulb temperature of ${40}^{\circ }C$ and wet bulb temperature of ${20}^{\circ }C$ is humidified in an air washer operating with continuous water recirculation. The wet bulb depression (i.e., the difference between the dry and wet bulb temperatures) at the exit is 25% of that at the inlet. The dry bulb temperature at the exit of the air washer is closest to