Heat Transfer, Refrigeration and Air Conditioning problems
- 1. The process of removing moisture from the air, without change in its dry bulb temperature, is called dehumidification.
Options- A. Correct
- B. Incorrect Discuss
Correct Answer: Correct
- 2. Thermal diffusivity of a substance is
Options- A. directly proportional to the thermal conductivity
- B. inversely proportional to density of substance
- C. inversely proportional to specific heat
- D. all of the above Discuss
Correct Answer: all of the above
- 3. Fouling factor is used
Options- A. in heat exchanger design as a safety factor
- B. in case of Newtonian fluids
- C. when a liquid exchanges heat with a gas
- D. none of the above Discuss
Correct Answer: in heat exchanger design as a safety factor
- 4. Which of the following refrigerant has the lowest freezing point?
Options- A. R-11
- B. R-12
- C. R-22
- D. Ammonia Discuss
Correct Answer: R-22
- 5. The critical pressure of a liquid is the pressure
Options- A. above which a liquid will remain a liquid
- B. above which a liquid will explode
- C. above which a liquid will always convert into a vapour
- D. below which a liquid will always be in vapour form Discuss
Correct Answer: above which a liquid will remain a liquid
- 6. Free convection flow depends on
Options- A. density
- B. coefficient of viscosity
- C. gravitational force
- D. all of these Discuss
Correct Answer: all of these
- 7. Air conditioning means
Options- A. cooling
- B. heating
- C. dehumidifying
- D. all of these Discuss
Correct Answer: all of these
- 8. The specific humidity during dehumidification process
Options- A. remains constant
- B. increases
- C. decreases Discuss
Correct Answer: decreases
- 9. During cooling and dehumidification, dry bulb temperature
Options- A. remains constant
- B. increases
- C. decreases Discuss
Correct Answer: decreases
- 10. The curved lines on a psychrometric chart indicates
Options- A. dry bulb temperature
- B. wet bulb temperature
- C. dew point temperature
- D. relative humidity Discuss
Correct Answer: relative humidity
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