Related Mcqs:

1. When dry bulb temperature & wet bulb temperature of moist air is the same, it means that the _________________?

   A. Partial pressure of water vapour is less than the total pressure
   B. Humidity is < 100% & dew point temperature of air has not reached
   C. Dew point temperature of air has not reached & air is not saturated fully
   D. Air is fully saturated

2. In a forced draft cooling tower, water is cooled from 95 to 80°F by exposure to air with a wet bulb temperature of 70°F. In this case, the________________?

   A. Range is 15°F
   B. Approach is 10°F
   C. Both A. & B.
   D. Neither A. nor B.

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3. Minimum temperature upto which water can be theoretically cooled down in the cooling tower by evaporative cooling is equal to the ______________ temperature of air?

   A. Wet bulb
   B. Dry bulb
   C. Saturation
   D. Dew point

4. When the wet steam is throttled but still remains wet at the exit of the throttle valve, then its temperature & dryness fraction respectively____________________?

   A. Decreases & increases
   B. Increases & increases
   C. Increases & decreases
   D. Decreases & decreases

5. The minimum temperature to which the water can be cooled in a cooling tower is the ______________ temperature of air?

   A. Ambient
   B. Dry bulb
   C. Dew point
   D. Wet bulb

6. Heating the Hypo-eutectoid steels to 30°C above the upper critical temperature line, soaking at that temperature and then cooling slowly to the room temperature to form a pearlite & ferrite structure is called_______________________?

   A. Tempering
   B. Hardening
   C. Annealing
   D. Normalising

7. During sensible heating of humid air__________________?

   A. Relative humidity increases
   B. Dew point remains constant
   C. Dry bulb & wet bulb temperature increases
   D. Both B & C

8. Evaporative cooling process employs a combination of cooling and humidification in which the____________________?

   A. Sensible heat is added
   B. Sensible heat is removed and the latent heat is added
   C. Latent heat is removed
   D. Sensible heat is added and latent heat is removed

9. Transformation range for ferrous material is the temperature interval during which ___________________ is formed during its heating?

   A. Cementite
   B. Austenite
   C. Martensite
   D. Pearlite

10. Moist air is cooled along the line of constant ________________ , when it is passed over a cold & dry cooling coil, such that no condensation occurs ?

    A. Enthalpy
    B. Relative humidity
    C. Wet bulb temperature
    D. Dew point temperature