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Air-petrol ratio in an automotive petrol engine is around

A. 14 : 1

B. 22 : 1

C. 25 : 1

D. 4 : 1

Correct Answer : A.


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  1. Frother is added in the froth floatation cell used in ore beneficiation to stabilise the air bubbles…
  2. Filler material used in welding should have __________ as compared to the parent metal to be welded.
  3. Identify the correct statement.
  4. Which of the following is an unconventional source of energy?
  5. Which of the following metals cannot be hot worked at room temperature?
  6. Heat flow across a hollow sphere of inner radius 'r1' and outer radius 'r2' is directly proportional…
  7. The Al2O3 content of cryolite in Hall- Heroult cell is maintained between __________ percent.
  8. Regeneration of molecular sieve requires it to be heated to a temperature of about __________ °C.
  9. Titanium is produced by __________ of Ti Cl4.
  10. 'Cryogenics' is concerned with the generation & use of low temperature in the range of
  11. Joule-Thomson co-efficient is the ratio of
  12. While the oxy-acetylene flame produces a temperature of 3200°C, the temperature produced by oxy-hydrogen…
  13. Function of fusible plug in a boiler is to
  14. With increase in compression ratio, the volumetric efficiency of air compressor
  15. In Newton's law of viscosity, which states that the shear stress is proportional to the __________ Co-efficient…
  16. The atmospheric temperature during melting of ice/snow (in the atmosphere)
  17. Pick out the wrong statement.
  18. Heat transfer to the water wall in a high pressure water wall type boiler furnace is mainly by
  19. The process of removal of scale formed during hot rolling of steel is termed as
  20. The unit of gc is
  21. A polymer is termed as an 'elastomer', if its percentage elongation is more than 100%. An elastomer…
  22. In an eutectic system, two elements are completely
  23. Normalising of a casting does not
  24. The escape velocity of a body on earth which is independent of its mass is about __________ km/second.
  25. The taper provided on pattern for its easy & clean withdrawal from the mould is termed as the __________…
  26. For a thermodynamic system undergoing a process, which of the following pairs best expresses the relationship…
  27. Venturimeter is used to measure the flow rate of fluids in pipes, when the pipe is in __________ position.
  28. Friction factor for fluid flow in pipe does not depend upon the
  29. Baffles provided on the shell side of a shell and tube heat exchanger are meant for
  30. Alloy powder manufactured by the following process have spherical shapes.