Discussion
Home ‣ Mechanical Engineering ‣ Heat Transfer, Refrigeration and Air Conditioning See What Others Are Saying!
- Question
In figure shown, E is a heat engine with efficiency of 0.4 and R is a refrigerator. It is given that Q2 + Q4 = 3Q1. The C.O.P. of the refrigerator is
Options- A. 2.5
- B. 3.0
- C. 4.0
- D. 5.0
- Correct Answer
- 5.0
- 1. A receiver in compressor installations is used to damp pressure waves in compressor discharge.
Options- A. Yes
- B. No Discuss
- 2. When the relation between the controlling force (Fc) and radius of rotation (r) for a spring controlled governor is Fc = ar + b, then the governor will be
Options- A. stable
- B. unstable
- C. isochronous
- D. none of these Discuss
- 3. In case of eccentrically loaded struts __________ is preferred.
Options- A. solid section
- B. hollow section
- C. composite section
- D. reinforced section Discuss
- 4. In order to cut mild steel, the cutting angle of chisel should be
Options- A. 30°
- B. 45°
- C. 50°
- D. 60° Discuss
- 5. A flanged pipe joint will be a leak-proof joint, if the circumferential pitch of the bolts is (where d = Diameter of bolt hole)
Options- A. less than 20 d
- B. greater than 30 d
- C. between 20 d and 30 d
- D. equal to inside diameter of pipe Discuss
- 6. The proof resilience is the maximum strain energy which can be stored in a body.
Options- A. Yes
- B. No Discuss
- 7. In ultra-sonic machining, tool is made of
Options- A. tungsten carbide
- B. brass or copper
- C. diamond
- D. stainless steel Discuss
- 8. Tandem drawing of wires and tubes is necessary because
Options- A. it is not possible to reduce at one stage
- B. annealing is needed between stages
- C. accuracy in dimensions is not possible otherwise
- D. surface finish improves after every drawing stage Discuss
- 9. The diameter of superheated tubes in a locomotive boiler is
Options- A. 13 mm
- B. 31 mm
- C. 130 mm
- D. 230 mm Discuss
- 10. The steam leaves the nozzle at a
Options- A. high pressure and a low velocity
- B. high pressure and a high velocity
- C. low pressure and a low velocity
- D. low pressure and a high velocity Discuss
More questions
Correct Answer: Yes
Correct Answer: unstable
Correct Answer: composite section
Correct Answer: 60°
Correct Answer: between 20 d and 30 d
Correct Answer: Yes
Correct Answer: brass or copper
Correct Answer: annealing is needed between stages
Correct Answer: 130 mm
Correct Answer: low pressure and a high velocity
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