Related Mcqs:

1. 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

2. At 100% relative humidity, the dew point temperature of moist air is_________________?

   A. Less than the wet bulb temperature
   B. More than the wet bulb temperature
   C. Equal to the wet bulb temperature
   D. Equal to the ambient temperature

3. A thin, flat & square plate measuring 2 m × 2 m is freely hanging in ambient air at 25°C. It is exposed to the solar radiation falling on one side of the plate at the rate of 500 W/m2. The plate temperature will remain constant at 30°C, if the convective heat transfer co-efficient is ________________ W/m2 °C ?

   A. 50
   B. 100
   C. 150
   D. 200

4. 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

5. _______________ is the hardest oxide and is hence used where high wear resistance at high temperature is required?

   A. Beryllium
   B. Zirconia
   C. Alumina
   D. Magnesia

6. What is the critical radius of insulation (cms) for a metallic cylinder, if the convective heat transfer co-efficient with the ambient atmosphere is 5 W/m2. °K? Thermal conductivity of metal and insulation material are 40 and 0.1 W/m.°K respectively ?

   A. 2
   B. 8
   C. 10
   D. 40

7. Materials having resistivity ranging from 1 to 100 ohm. cm is termed as___________________?

   A. Conductor
   B. Insulator
   C. Semi-conductor
   D. None of these

8. _____________ is the process of coating the surface of steel with aluminium oxide, thereby imparting it increased resistance to corrosion & oxidation upto a temperature of 700°C ?

   A. Veneering
   B. Galvanising
   C. Electroplating
   D. Calorising

9. In a boundary layer developed along the flow, the pressure decreases in the downstream direction. The boundary layer thickness in this case will _______________?

   A. Decrease gradually
   B. Increase gradually
   C. Increase rapidly
   D. Remain constant

10. With increase in temperature, the electrical conductivity of a _________________ decreases ?

    A. Semi-conductor
    B. Metal or alloy
    C. Dielectric
    D. None of these