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- Question
Two long parallel surfaces each of emissivity 0.7 are maintained at different temperatures and accordingly have radiation heat exchange between them. It is desired to reduce 75% of the radiant heat transfer by inserting thin parallel shields of emissivity 1 on both sides. The number of shields should be
Options- A. one
- B. two
- C. three
- D. four
- Correct Answer
- three
- 1. If a number of forces are acting at a point, their resultant is given by
Options- A. (?V)2 + (?H)2
- B.
- C. (?V)2 +(?H)2 +2(?V)(?H)
- D.
Discuss
- 2. The wet bulb depression indicates __________ humidity of the air.
Options- A. absolute
- B. relative
- C. specific Discuss
- 3. The work ratio of simple gas turbine cycle depends upon
Options- A. maximum cycle temperature
- B. minimum cycle temperature
- C. pressure ratio
- D. all of these Discuss
- 4. Nimonic contains __________ percentage of nickel as that of Inconel.
Options- A. same
- B. less
- C. more Discuss
- 5. The discharge through an external mouthpiece is given by (where a = Cross-sectional area of the mouthpiece, and H = Height of liquid above the mouthpiece)
Options- A. 0.855 a2gH
- B. 1.855 aH2g
- C. 1.585 a2gH
- D. 5.85 aH2g Discuss
- 6. The factor considered for evaluation of machinability is
Options- A. cutting forces and power consumption
- B. tool life
- C. type of chips and shear angle
- D. all of these Discuss
- 7. In an impulse turbine, the jet of water impinges on the bucket with a low velocity and after flowing over the vanes, leaves with a high velocity.
Options- A. True
- B. False Discuss
- 8. The starting system includes
Options- A. a battery, a starter, and an ignition switch
- B. a battery, a distributor, and an ignition switch
- C. a battery, a starter, and a distributor
- D. a distributor, a starter, and an ignition switch Discuss
- 9. The ratio of shear modulus to the modulus of elasticity for a Poisson's ratio of 0.4 will be
Options- A. 5/7
- B. 7/5
- C. 5/14
- D. 14/5 Discuss
- 10. Brass is an alloy of
Options- A. copper and zinc
- B. copper and tin
- C. copper, tin and zinc
- D. none of these Discuss
More questions
Correct Answer:
Correct Answer: relative
Correct Answer: all of these
Correct Answer: same
Correct Answer: 0.855 a2gH
Correct Answer: all of these
Correct Answer: False
Correct Answer: a battery, a starter, and an ignition switch
Correct Answer: 5/14
Correct Answer: copper and zinc
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