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- Question
For a two stage reciprocating compressor, compression from p1 to p3 is with perfect intercooling and no pressure losses. If compression in both the cylinders follows the same polytropic process and the atmospheric pressure is pa, then the intermediate pressure p2 is given by
Options- A. p2 = (p1 + p3)/2
- B. p2 = p1.p3
- C. P2 = Pa x p3/p1
- D. p2 = pa p3/p1
- Correct Answer
- p2 = p1.p3
- 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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