Discussion
Home ‣ Mechanical Engineering ‣ Heat Transfer, Refrigeration and Air Conditioning See What Others Are Saying!
- Question
Thermal diffusivity of a substance is given by (where h = Thermal diffusivity, ? = Density of substance, S = Specific heat, and k = Thermal conductivity)
Options- A.
- B.
- C.
- D.
- Correct Answer
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- 1. In an impulse turbine
Options- A. the steam is expanded in nozzles only and there is a pressure drop and heat drop
- B. the steam is expanded both in fixed and moving blades continuously
- C. the steam is expanded in moving blades only
- D. the pressure and temperature of steam remains constant Discuss
- 2. When the temperature of the surrounding is higher than the temperature of the body, then the heat loss by convection from the body to the surrounding will be
Options- A. positive
- B. negative
- C. zero
- D. none of these Discuss
- 3. The parking brake generally acts on
Options- A. front wheels
- B. rear wheels
- C. front and rear wheels
- D. propeller shaft Discuss
- 4. The velocity of tool along the tool face is known as
Options- A. shear velocity
- B. chip velocity
- C. cutting velocity
- D. mean velocity Discuss
- 5. The carbon in the pig iron varies from
Options- A. 0.1 to 0.5%
- B. 0.5 to 1%
- C. 1 to 5%
- D. 5 to 10% Discuss
- 6. Nickel when added to copper improves
Options- A. machinability
- B. hardness
- C. hardness and strength
- D. strength and ductility Discuss
- 7. In case of an over-reinforced beam, the depth of actual neutral axis is the same as that of the critical neutral axis.
Options- A. True
- B. False Discuss
- 8. The temperature of the inner luminous cone of neutral flame is about
Options- A. 1000° C
- B. 1250° C
- C. 2100° C
- D. 3200° C Discuss
- 9. The absolute humidity is the mass of water vapour present in 1 m3 of dry air.
Options- A. Agree
- B. Disagree Discuss
- 10. Which of the following statements are true for annealing of steels?
Options- A. Steels are heated to 500 to 700° C
- B. Cooling is done slowly and steadily
- C. Internal stresses are relieved
- D. all of these Discuss
More questions
Correct Answer: the steam is expanded in nozzles only and there is a pressure drop and heat drop
Correct Answer: negative
Correct Answer: rear wheels
Correct Answer: chip velocity
Correct Answer: 1 to 5%
Correct Answer: hardness
Correct Answer: False
Correct Answer: 3200° C
Correct Answer: Agree
Correct Answer: all of these
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