Basic Mechanical Engineering Notes

                            

 Basic Mechanical Engineering

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1. Two balls of equal mass and of perfectly elastic material are lying on the floor. One of the ball with velocity v is made to strike the second ball. Both the balls after impact will move with a

velocity v/2.

2. The break-even point is that volume of production where 

no profit exists.

3. The melting point of the filler material in brazing should be above 

420 deg C.

4. A product layout is generally suggested for 

continuous type of production.

5.One of the following objectives is not achieved by the process of annealing

to increase the yield point.

6.The friction experienced by a body, when in motion, is known as 

dynamic friction.

7. The objective of time study is to determine the time taken by 

efficient machine utilization.

8. Static friction is always greater than

dynamic friction.

9. If the resultant of two equal forces have the same magnitude as either of the forces, then the 

the angle between the two forces is 120°.

10.In a process chart the 

inverted triangle symbol indicates storage.

11. Feeler gauges are used for measuring the clearances between 

mating parts.

12. The mechanical advantage of a lifting machine is the ratio of 

the load lifted to the effort applied.

13. A micrometer screw has the pitch of 0.5 mm and the thimble has 100 equal divisions marked on it, the least count of the instrument in mm is

 0.005.

14. One of the materials used for making the surface plate is granite.

15. The range of projectile on a downward inclined plane is more than the range on an upward inclined plane for the same

the velocity of projection and angle of projection.

16. A smooth cylinder lying on its convex surface remains in 

unstable equilibrium.

17. The range of a projectile is maximum when the angle of projection is 

45°.

18. The force required to move the body up the plane will be minimum if it makes an angle with the inclined plane 

equal to the angle of friction.

19. The algebraic sum of the resolved parts of a number of forces in a given direction is equal to the resolved part of their resultant in the same direction. This is known as the principle of

resolution of forces.

20.The unit of power in S.I. units are

watt.

21. Three forces acting on a rigid body are represented in magnitude, direction, and line of action by the three sides of a triangle taken in order. The forces are equivalent to a couple whose

the moment is 

equal to twice the area of the triangle.

22. When a rigid body is suspended vertically, and it oscillates with a small amplitude under the action of the force of gravity, the body is known as 

compound pendulum.

23. The maximum frictional force, which comes into play, when a body just begins to slide over the surface of the other body, is known as 

limiting friction.

24. The force, by which the body is attracted, towards the center of the earth, is called 

weight.

25. During elastic impact, the relative velocity of the two bodies after impact is equal and opposite to the relative velocity of the two bodies 

before impact.

26. If the number of pulleys in a system is equal to its velocity ratio, then it is a

the second system of the pulley.

27. The bodies which rebound after impact are called 

elastic bodies.

28. The law of motion involved in the recoil of the gun is 

Newton's third law of motion.

29. One watt is equal to 

1 joule/s.

30. When two elastic bodies collide with each other than the two bodies begin to regain their original shape.

the two bodies will momentarily come to rest after collision.

the two bodies tend to compress and deform at the surface of contact.

31. A redundant frame is also called

imperfect frame.

32.The angle between two forces when the resultant is maximum and minimum

 respectively are 0° and 180.

33. Co-planer concurrent forces are those forces which meet at one point and their lines of action also lie on the same plane.

34. The sprue is the passing provided for the inflow.

35. An aircraft gas turbine operates on Breton cycle.

36. The pump with a low initial cost and low maintenance cost is 

centrifugal pump.

37. Which of the following operations cannot be performed on a lathe is 

slotting operation.

38. Upsetting is the term used in one of the following operations 

forging.

39. Rapping allowance is provided on a pattern to take care of 

easy withdrawal.

40. The operation of enlarging of a hole is called 

boring.

41. Quick return motion is used in a 

shaper.

42. One of the following methods is adopted for governing of steam

turbines in a power plant

throttle governing.

43. Brasses and bronzes are welded using

neutral flame.

44. In Industry of the developed nations, the type of production most often occurring is 

Batch production.

45. Draft on a pattern is provided for providing for 

shrinkage of the casting.

46. Mandrels are used to hold 

hollow workpieces.

47. In up cut milling the workpiece is fed against the


rotating cutter.

48. Feed in a lathe is expressed in mm per revolution.

49.For the purpose of comparison, the steam generating capacity of a boiler is generally expressed in terms of

 equivalent evaporation.

50.A refrigerant used in the domestic refrigerator is Freon .

51.Reducing flame is obtained in oxyacetylene welding with 

excess of acetylene.

52. If a number of coplaner forces acting at a point be in equilibrium, the sum of clockwise moments must be equal to the sum of anticlockwise moments about any point.

53.Which of the following are vector

quantities?

Angular velocity

Angular acceleration

Angular displacement

all of these.

54.A lead ball with a certain velocity is made to strike a wall, it falls down, but rubber ball of same mass and with same velocity strikes the same wall, it rebounds.

55.The total motion possessed by a body, is called momentum.

56.When a body falls freely under gravitational force, it possesses 

no weight.

57.The forces, which meet at one point and their lines of action also lie on the same plane, are known as 

coplaner concurrent forces .

58.The amplitude is always equal to

radius of the circle.

59.The matter contained in a body, is called mass .

60.According to lame's theorem if the three forces acting at a point are in equilibrium, then each force is proportional to the sine of the angle between the other two.

61.A machine having an efficiency greater than 50%, is known as

reversible machine.

62.An ideal machine is one whose efficiency is 100%.

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