Discussion
Home ‣ Mechanical Engineering ‣ Heat Transfer, Refrigeration and Air Conditioning Comments
- Question
In a shell and tube heat exchanger, baffles are provided on the shell side to
Options- A. improve heat transfer
- B. provide support for tubes
- C. prevent stagnation of shell side fluid
- D. all of these
- Correct Answer
- all of these
- 1. Fourier's law of heat conduction gives the heat flow for
Options- A. irregular surfaces
- B. non-uniform temperature surfaces
- C. one dimensional cases only
- D. two dimensional cases only Discuss
- 2. The condition of refrigerant after passing through the condenser in a vapour compression system is
Options- A. saturated liquid
- B. wet vapour
- C. dry saturated vapour
- D. superheated vapour Discuss
- 3. During humidification process, dry bulb temperature
Options- A. remains constant
- B. increases
- C. decreases Discuss
- 4. A Bell Coleman refrigerator working on dense air system as compared to open air system, for the same range of temperature, results in higher coefficient of performance.
Options- A. Agree
- B. Disagree Discuss
- 5. The boiling point of ammonia is
Options- A. -10.5°C
- B. -30°C
- C. -33.3°C
- D. -77.7°C Discuss
- 6. Dew point temperature is the temperature of air recorded by a thermometer, when the moisture present in it begins to condense.
Options- A. Correct
- B. Incorrect Discuss
- 7. The heat rejection factor (HRF) is given by
Options- A. 1 + C.O.P
- B. 1 - C.O.P.
- C.
- D.
Discuss
- 8. An electric cable of aluminium conductor (k = 240 W/mK) is to be insulated with rubber (k = 0.15 W/mK). The cable is to be located in air (h = 6 W/m2). The critical thickness of insulation will be
Options- A. 25 mm
- B. 40 mm
- C. 160 mm
- D. 800 mm Discuss
- 9. The amount of heat flow through a body by conduction is
Options- A. directly proportional to the surface area of the body
- B. directly proportional to the temperature difference on the two faces of the body
- C. inversely proportional to the thickness of the body
- D. all of the above Discuss
- 10. In order to collect liquid refrigerant and to prevent it from going to a __________ , a device known as accumulator is used at the suction of compressor.
Options- A. compressor
- B. condenser
- C. expansion valve
- D. evaporator Discuss
Heat Transfer, Refrigeration and Air Conditioning problems
Search Results
Correct Answer: one dimensional cases only
Correct Answer: saturated liquid
Correct Answer: remains constant
Correct Answer: Agree
Correct Answer: -33.3°C
Correct Answer: Correct
Correct Answer:
Correct Answer: 25 mm
Correct Answer: all of the above
Correct Answer: compressor
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