Discussion
Home ‣ Mechanical Engineering ‣ Heat Transfer, Refrigeration and Air Conditioning See What Others Are Saying!
- Question
The average value of thermal conductivity for water at 20° C saturate is about 0.51.
Options- A. True
- B. False
- Correct Answer
- True
- 1. The diameter of the nozzle (d) for maximum transmission of power is given by (where D = Diameter of pipe, f = Darcy 's coefficient of friction for pipe, and l = Length of pipe )
Options- A.
- B.
- C.
- D.
Discuss
- 2. A throttle governed steam engine develops 15 kW with 280 kg per hour of steam and 35 kW with 520 kg per hour of steam. The steam consumption in kg per hour when developing 20 kW will be nearly
Options- A. 150 kg/h
- B. 210 kg/h
- C. 280 kg/h
- D. 340 kg/h Discuss
- 3. Where reactor operation is designed with fast neutrons such as in reactors using highly enriched fuel, the moderator used is
Options- A. heavy water
- B. graphite
- C. carbon dioxide
- D. no moderator is needed Discuss
- 4. The evaporator changes the low pressure liquid refrigerant from the expansion valve into
Options- A. high pressure liquid refrigerant
- B. low pressure liquid and vapour refrigerant
- C. low pressure vapour refrigerant
- D. none of these Discuss
- 5. The basic characteristics of a brake fluid is
Options- A. a high boiling point
- B. low viscosity
- C. compatibility with rubber and metal parts
- D. all of these Discuss
- 6. In a crystalline material, atoms are arranged in definite and orderly manner and form.
Options- A. Agree
- B. Disagree Discuss
- 7. In a simple bending theory, one of the assumption is that the plane sections before bending remain plane after bending. This assumption means that
Options- A. stress is uniform throughout the beam
- B. strain is uniform throughout the beam
- C. stress is proportional to the distance from the neutral axis
- D. strain is proportional to the distance from the neutral axis Discuss
- 8. Environmental protection agencies advice against the use of chloro-fluoro-carbon refrigerants since
Options- A. these react with water vapour and cause acid rain
- B. these react with plants and cause green-house effect
- C. these react with oxygen and cause its depletion
- D. these react with ozone layer Discuss
- 9. According to Unwin's formula, the relation between the diameter of rivet hole (d) and the thickness of plate (t) is given by (where d and t are in mm)
Options- A. d = t
- B. d = 1.6 t
- C. d = 2 t
- D. d = 6 t Discuss
- 10. The silicon steel is widely used for
Options- A. connecting rods
- B. cutting tools
- C. generators and transformers in the form of laminated cores
- D. motor car crankshafts Discuss
More questions
Correct Answer:
Correct Answer: 340 kg/h
Correct Answer: no moderator is needed
Correct Answer: low pressure vapour refrigerant
Correct Answer: all of these
Correct Answer: Agree
Correct Answer: strain is proportional to the distance from the neutral axis
Correct Answer: these react with ozone layer
Correct Answer: d = 6 t
Correct Answer: generators and transformers in the form of laminated cores
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