ONE LINE MECHANICAL ENGINEERING QUESTIONS & ANSWERS ( part-1)

1.An ideal flow of any fluid must fulfill the continuity equation, invisid (surface tension=0),incompressible,zero shear resistance properties.

2.In centrifugal casting:

The impurities are collected in the centre of the casting,product of symmetrical shape about horizontal axis is produced.

3.Cold chamber die casting - non ferrous alloys with high melting temperature.

4. Herringbone gears are- Double Helical Gears

5. Lancashire Boiler – Horizontal fire tube Boiler

6. Vanes of centrifugal Pumps are- Curved Backward

7. Head loss for sudden expansion > head loss for sudden contraction ( for same diameter ratio).

8.Viscosity of water is higher than the viscosity of mercury.

9.  M=1 sonic region.

10. M<1 sub sonic region

11. M>1 super sonic region.

12. M<0.3 incompressible fluid.

13. Semi Automatic Welding Process- Submerged Arc welding

14. In shaper, Metal is removed during- Forward stroke

15. Blast furnace is used to produce- Pig iron

16. Blade of Power Saw is made of- High speed steel

17. Quartz is a- Piezoelectric material

18. Maximum value of Poisson ratio- 0.5

19.Gray surface properties independent of wavelength

20.Notching - removal of metal to the desired shape from the edge of a plate.

21.Blanking and piercing operation can be performed simultaneously in a compound die

22.Lancing – cutting a sheet of metal through part of its length and then bending the cut portion.

23.In welding CU alloys with TIG arc welding - direct current with straight polarity is used.

24. Forge welding- Solid State Welding

25. Angle of V Belts is- 40˚

26. Brayton cycle is – Reversed joule cycle

27. Critical temperature for water- 374˚C

28. Steam in Boiler drum- Superheated

29. Orifice meter is used to measure- Discharge

30.PERT – event oriented technique

31.Work study - method study and work measurement

32.Simplex -  linear programming method

33.Gantt method - production schedule.  

34. In a flange coupling, the flanges are coupled together by- bolts and nuts

35. For an involute gear, the ratio of base circle radius and pitch circle radius is equal to- cos φ

36. The height of a Watt’s governor is- Inversely proportional to speed

37. For same compression ratio and for same heat addition- Otto cycle is more efficient than Diesel Cycle

38. Blanking - Shear force

39.Deep Drawing - Tensile and compressive

40. Wire drawing - Tensile

41.Coining – Compressive

42.Flow in a straight long pipe with varying flow rate- Uniform and unsteady

43. Streamline, path line and streak line are Identical when the- Flow is steady

44. Condition for Continuous chip- Ductile material, high cutting speed, Low    feed and depth of cut

45. In Thermit welding- Thermit is a mixture of iron oxide and aluminum

46. Back rake angle for brass- Zero

47. Effect of sub cooling on performance of Vapor compression cycle- Refrigerating effect will increase and Cop increases

48. The eutectic mixture of austenite (γ) and cementite (Fe3C) is- Ledeburite

49. For self locking condition- Friction angle > Helix angle

50. Point of application of hydrostatic pressure force- Centre of Pressure