Discussion
Home ‣ Mechanical Engineering ‣ Heat Transfer, Refrigeration and Air Conditioning Comments
- Question
The process of heat transfer from one particle of the fluid to another by the actual movement of the fluid particles caused by some mechanical means, is known as
Options- A. conduction
- B. free convection
- C. forced convection
- D. radiation
- Correct Answer
- forced convection
- 1. For air conditioning the operation theatre in a hospital, the percentage of outside air in the air supplied is
Options- A. zero
- B. 20
- C. 50
- D. 100 Discuss
- 2. Dry bulb temperature is the temperature of air recorded by a thermometer, when
Options- A. it is not affected by the moisture present in the air
- B. its bulb is surrounded by a wet cloth exposed to the air
- C. the moisture present in it begins to condense
- D. none of the above Discuss
- 3. For large tonnage (more than 200 TR) air-conditioning applications, the compressor recommended is
Options- A. reciprocating
- B. rotating
- C. centrifugal
- D. screw Discuss
- 4. A valve which maintains a constant degree of superheat at the end of the evaporator coil, is called
Options- A. automatic expansion valve
- B. high side float valve
- C. thermostatic expansion valve
- D. low side float valve Discuss
- 5. The temperature of air recorded by a thermometer, when its bulb is surrounded by a wet cloth exposed to the air, is called
Options- A. wet bulb temperature
- B. dry bulb temperature
- C. dew point temperature
- D. none of these Discuss
- 6. The average value of thermal conductivity for water at 20° C saturate is about 0.51.
Options- A. True
- B. False Discuss
- 7. The heat of sun reaches to us according to
Options- A. conduction
- B. convection
- C. radiation
- D. none of these Discuss
- 8. Which of the following statement is wrong?
Options- A. The value of C.O.P. is always greater than one.
- B. In a vapour compression system, the condition of refrigerant before entering the compressor is dry saturated vapour.
- C. The space between the saturated liquid line and saturated vapour line, in a pressure enthalpy chart, is wet vapour region.
- D. none of the above Discuss
- 9. Kirchhoff's law states that
Options- A. the total radiation from a black body per second per unit area is directly proportional to the fourth power of the absolute temperature
- B. the wave length corresponding to the maximum energy is proportional to the absolute temperature
- C. the ratio of the emissive power and absorptive power of all bodies is the same and is equal to the emissive power of a perfectly black body
- D. none of the above Discuss
- 10. Film coefficient is defined as the ratio of
Options- A. thermal conductivity to the equivalent thickness of the film of fluid
- B. temperature drop through the films of fluids to the thickness of film of fluids
- C. thickness of film of fluid to the thermal conductivity
- D. thickness of film of fluid to the temperature drop through the films of fluids Discuss
Heat Transfer, Refrigeration and Air Conditioning problems
Search Results
Correct Answer: 100
Correct Answer: it is not affected by the moisture present in the air
Correct Answer: centrifugal
Correct Answer: low side float valve
Correct Answer: wet bulb temperature
Correct Answer: True
Correct Answer: radiation
Correct Answer: none of the above
Correct Answer: the ratio of the emissive power and absorptive power of all bodies is the same and is equal to the emissive power of a perfectly black body
Correct Answer: thermal conductivity to the equivalent thickness of the film of fluid
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