Discussion
Home ‣ Mechanical Engineering ‣ Heat Transfer, Refrigeration and Air Conditioning Comments
- Question
The expression
is used for calculating relative humidity.
Options- A. Yes
- B. No
- Correct Answer
- No
- 1. 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
- 2. The critical temperature is the temperature
Options- A. below which a gas does not obey gas laws
- B. above which a gas may explode
- C. below which a gas is always liquified
- D. above which a gas will never liquified Discuss
- 3. When the discharge pressure is too high in a refrigeration system, high pressure control is installed to stop the compressor.
Options- A. Correct
- B. Incorrect Discuss
- 4. In case ofsensible cooling of air, the coil efficiency is given by
Options- A. B.P.F. - 1
- B. 1 - B.P.F.
- C.
- D. 1 + B.P.F. Discuss
- 5. If the energy radiated per second per sq. cm. of the surface for wave lengths lying between ?, and ? + d? is represented by (e?.d?), then e? is called
Options- A. absorptive power
- B. emissive power
- C. emissivity
- D. none of these Discuss
- 6. 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
- 7. 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
- 8. 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
- 9. For large tonnage (more than 200 TR) air-conditioning applications, the compressor recommended is
Options- A. reciprocating
- B. rotating
- C. centrifugal
- D. screw Discuss
- 10. 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
Heat Transfer, Refrigeration and Air Conditioning problems
Search Results
Correct Answer: the positive work in isentropic expansion of liquid is very small
Correct Answer: above which a gas will never liquified
Correct Answer: Correct
Correct Answer: 1 - B.P.F.
Correct Answer: emissive power
Correct Answer: superheated vapour
Correct Answer: wet bulb temperature
Correct Answer: low side float valve
Correct Answer: centrifugal
Correct Answer: it is not affected by the moisture present in the air
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