Machine Design Mcq PART-3

Machine Design  Mcq  PART-3

01. A screw will be self locking, if

A .friction angle is more than helix angle      

02. The maximum shear stress theory is used for

A .ductile materials

03. The rolling contact bearings are known as

A .antifriction bearings

04. The backlash for spur gears depends upon

A.module

B.pitch line velocity

C .both (a) and (b)

05. When carbon in the cast iron is principally in the form of graphite, the cast iron will be of

A.grey colour

06. A shoe brake is commonly used in

A. railway trains.

07. The rivet head used for boiler plate riveting is usually

         

A.snap head

08. 18/8 steel contains

A .18% chromium and 8% nickel

09. A localised compressive stress at the area of contact between two members is known as

A .bearing stress

10. The metal suitable for bearings subjected to heavy loads is

A .white metal

11. An universal coupling is used to connect two shafts

A .whose axes intersect at a small angle

12. A taper key which fits half in the key way of the hub and half in the key way of shaft, is known as

A. sunk key

13. When bevel gears having equal teeth and equal pitch angles connect two shafts whose axes intersect at right angle, then they are known as

  

D.mitre gears

14. A machine part subjected to an axial compressive force is called a

A.strut.

15. Which one of the following is a positive drive?

A .Chain drive

16. The included angle for the British Association thread is

A .47.3°

17. Tapered roller bearings can take

A .both radial and axial loads and the ratio of these being greater than unity

18. In order to remove internal stresses produced by hardening the steel, the process usually adopted is

A. tempering

19. In levers, leverage is the ratio of

A .effort arm to the load arm

20. Lewis equation in gears is used to find the

A .compressive stress in bending

21. All stresses produced in a belt are

A .tensile stresses

22. A shaft is designed on the basis of

A. rigidity and stiffness.

23. Which of the following spring is used in mechanical wrist watch?

A .Torsion spring

  

24. Which of the following has threads at both ends?

A .Stud

  

25. The ratio of the ultimate stress to the design stress is known as

A .factor of safety

26. The cam follower extensively used in air-craft engines is

A .roller follower

27. The resilience of a bolt may be increased by

A .increasing its length

28. A connecting rod should be

A .equally strong in buckling about X-axis and Y-axis

29. A basic hole is one whose

A.lower deviation is zero

30. The property of a material which enables it to be drawn into wires with the application of a tensile force, is called

A .ductility

31. The helix angle for single helical gears ranges from

  

A .20° to 35°

32. A leaf spring in automobiles is used

A .to absorb shocks

33. Pitch point of a cam is

A .a point on the pitch curve having maximum pressure angle

34. A screw is specified by its

A.major diameter

35. Antifriction bearings are

A .ball and roller bearings

  

36. Stress concentration factor is defined as the ratio of

A .maximum stress to the nominal stress

37. In the levers of third type, the mechanical advantage is

A . less than one.

38. The toughness of a material __________ when it is heated.

A .decreases

39. A screw is said to be over hauling screw, if its efficiency is

A .more than 50%

40. The application of third type levers is found in

A .a pair of tongs

41. In second type of levers,

A.load is in between the fulcrum and effort

42. In a flange coupling, the flanges are coupled together by means of

A.bolts and nuts

43. Slenderness ratio is the ratio of

A .effective length of column to least radius of gyration of the column

44. A crankshaft is a __________ shaft.

A .machine

  

45. A column is known as a long column if the slenderness ratio is

A .100

46. The ball bearings are provided with a cage

A .to maintain the balls at a fixed distance apart

47. In radial cams, the follower moves

A.in a direction perpendicular to the cam axis

48. The value of stress concentration factor depends upon

A .material and geometry of the part

49. An open belt drive is used when

A .shafts are arranged parallel and rotate in the same directions

50. In unilateral system of tolerance, the tolerance is allowed on

A .one side of the nominal size

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