Discussion
Home ‣ Mechanical Engineering ‣ Heat Transfer, Refrigeration and Air Conditioning See What Others Are Saying!
- Question
The heat transfer by conduction through a thick sphere is given by
Options- A.
- B.
- C.
- D.
- Correct Answer
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- 1. The water tubes in a Babcock and Wilcox boiler are
Options- A. vertical
- B. horizontal
- C. inclined Discuss
- 2. In TIG arc welding, the welding zone is shielded by an atmosphere of
Options- A. helium gas
- B. argon gas
- C. either (a) or (b)
- D. none of these Discuss
- 3. For a self locking machine, the efficiency must be
Options- A. equal to 50%
- B. less than 50%
- C. greater than 50%
- D. 100% Discuss
- 4. The Parsons' reaction turbine has
Options- A. only moving blades
- B. only fixed blades
- C. identical fixed and moving blades
- D. fixed and moving blades of different shape Discuss
- 5. Galvanising is a
Options- A. zinc diffusion process
- B. process of coating zinc by hot dipping
- C. process used for making thin phosphate coating on steel
- D. none of the above Discuss
- 6. Supercharging __________ the power developed by the engine.
Options- A. has no effect on
- B. increases
- C. decreases Discuss
- 7. The exhaust gas from petrol engine contains
Options- A. petrol vapours
- B. water vapours
- C. carbon monoxide
- D. all of these Discuss
- 8. The stiffness is the ability of a material to resist
Options- A. deformation under stress
- B. fracture due to high impact loads
- C. externally applied forces with breakdown or yielding
- D. none of the above Discuss
- 9. A nozzle is said to be a divergent nozzle
Options- A. when the cross-section of the nozzle increases continuously from entrance to exit
- B. when the cross-section of the nozzle decreases continuously from entrance to exit
- C. when the cross-section of the nozzle first decreases from entrance to throat and then increases from its throat to exit
- D. none of the above Discuss
- 10. When the gas is heated at constant volume, the heat supplied increases the internal energy of the gas.
Options- A. True
- B. False Discuss
More questions
Correct Answer: inclined
Correct Answer: either (a) or (b)
Correct Answer: less than 50%
Correct Answer: identical fixed and moving blades
Correct Answer: process of coating zinc by hot dipping
Correct Answer: increases
Correct Answer: all of these
Correct Answer: deformation under stress
Correct Answer: when the cross-section of the nozzle increases continuously from entrance to exit
Correct Answer: True
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