Thermodynamics (Psychrometrics)
1. In an unsaturated air the state of a
vapour is
(a) wet
(b) superheated
(c) saturated
(d) unsaturated.
2. For saturated air
(a) Wet bulb depression is zero
(b) Wet bulb depression is positive
(c) Wet bulb depression is negative
(d) Wet bulb depression can be either
positive or negative.
3. Which one of the following statements is
correct ?
(a) Dew point temperature can be measured
with the help of thermometer
(b) Dew point temperature is the saturation
temperature corresponding to the partial pressure of the water vapour in moist
air.
(c) Dew point temperature is the same as the
thermodynamic wet bulb temperature.
(d) For saturated air, dew point
temperature is less than the wet bulb temperature.
4. During sensible heating of moist air, enthalpy
(a) increases
(b) decreases
(c) remains constant
(d) none of the above.
5. During sensible cooling, wet bulb
temperature
(a) decreases
(b) increases
(c) remains constant
(d) can decrease or increase.
6. Which one of the following statements is
correct ?
(a) Evaporative cooling and sensible
cooling is the same
(b) Evaporative cooling is a cooling and
humidification process
(c) Evaporative cooling is a cooling and
dehumidification process
(d) Evaporative cooling is not effective
for hot and dry climates.
7. An air washer can work as a
(a) filter only
(b) humidifier only
(c) dehumidifier only
(d) all of the above.
8. The relative humidity, during sensible
heating,
(a) can increase or decrease
(b) increases
(c) decreases
(d) remains constant.
9. The vapour pressure, during sensible
heating of moist air,
(a) increases
(b) decreases
(c) can increase or decrease
(d) remains constant.
10. The relative humidity, during heating
and humidification,
(a) increases
(b) decreases
(c) may increase or decrease
(d) remains constant.
11. The relative humidity, during cooling
and dehumidification of moist air
(a) increases
(b) decreases
(c) can increase or decrease
(d) remains constant.
Answers
1. (b) 2.
(a) 3. (b) 4. (a) 5. (a)
6. (b) 7.
(d) 8. (b) 9. (d) 10. (a)
11. (c).
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