Discussion
Home ‣ Mechanical Engineering ‣ Heat Transfer, Refrigeration and Air Conditioning Comments
- Question
For large tonnage (more than 200 TR) air-conditioning applications, the compressor recommended is
Options- A. reciprocating
- B. rotating
- C. centrifugal
- D. screw
- Correct Answer
- centrifugal
- 1. 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
- 2. 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
- 3. In a vapour compression system, the condition of refrigerant before passing through the condenser is
Options- A. saturated liquid
- B. wet vapour
- C. dry saturated vapour
- D. superheated vapour Discuss
- 4. The expression
is used for calculating relative humidity.
Options- A. Yes
- B. No Discuss
- 5. In a vapour compression refrigeration system, a throttle valve is used in place of an expander because
Options- A. it considerably reduces mass of the system
- B. it improves the C.O.P., as the condenser is small
- C. the positive work in isentropic expansion of liquid is very small
- D. it leads to significant cost reduction Discuss
- 6. 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
- 7. 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
- 8. 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 Discuss
- 9. The average value of thermal conductivity for water at 20° C saturate is about 0.51.
Options- A. True
- B. False Discuss
- 10. The heat of sun reaches to us according to
Options- A. conduction
- B. convection
- C. radiation
- D. none of these Discuss
Heat Transfer, Refrigeration and Air Conditioning problems
Search Results
Correct Answer: low side float valve
Correct Answer: wet bulb temperature
Correct Answer: superheated vapour
Correct Answer: No
Correct Answer: the positive work in isentropic expansion of liquid is very small
Correct Answer: it is not affected by the moisture present in the air
Correct Answer: 100
Correct Answer: forced convection
Correct Answer: True
Correct Answer: radiation
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