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. A low wet bulb temperature indicates very __________ humidity.
Options- A. low
- B. high Discuss
- 2. The coefficient of venturifiume, generally, lies between
Options- A. 0.3 to 0.45
- B. 0.50 to 0.75
- C. 0.75 to 0.95
- D. 0.95 to 1.0 Discuss
- 3. The frequency of damped vibrations with viscous damping is __________ the frequency of undamped vibrations.
Options- A. more than
- B. less than
- C. same as Discuss
- 4. In order to balance the reciprocating masses,
Options- A. primary forces and couples must be balanced
- B. secondary forces and couples must be balanced
- C. both (a) and (b)
- D. none of these Discuss
- 5. A twist drill is a
Options- A. side cutting tool
- B. front cutting tool
- C. end cutting tool
- D. none of these Discuss
- 6. A petrol engine has compression ratio from
Options- A. 6 to 10
- B. 10 to 15
- C. 15 to 25
- D. 25 to 40 Discuss
- 7. The thermal efficiency of diesel engines on weak mixtures is
Options- A. unaffected
- B. lower
- C. higher
- D. dependent on other factors Discuss
- 8. In electro-discharge machining, dielectric is used to
Options- A. help in the movement of the sparks
- B. control the spark discharges
- C. act as coolant
- D. all of these Discuss
- 9. It is required to cut screw threads of 2 mm pitch on a lathe. The lead screw has a pitch of 6 mm. If the spindle speed is 60 r.p.m., then the speed of lead screw will be
Options- A. 10 r.p.m.
- B. 20 r.p.m.
- C. 120 r.p.m.
- D. 180 r.p.m. Discuss
- 10. Which of the following metal shrinks most from molten state to solid state?
Options- A. Cast iron
- B. Cast steel
- C. Brass
- D. Admirality metal Discuss
More questions
Correct Answer: low
Correct Answer: 0.95 to 1.0
Correct Answer: less than
Correct Answer: both (a) and (b)
Correct Answer: end cutting tool
Correct Answer: 6 to 10
Correct Answer: higher
Correct Answer: all of these
Correct Answer: 20 r.p.m.
Correct Answer: Admirality metal
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