Machine Design Mcq Part – 4

Machine Design Mcq Part – 4

01. Surface endurance limit of gear material is dependent upon its

A .brinell hardness number 

02. Stress concentration is caused due to

A .abrupt change of cross-section

03. The resistance to fatigue of a material is measured by

  

A .endurance limit

04. The sleeve or muff coupling is designed as a

A .Hollow shaft

04. Screws used for power transmission should have

A .high efficiency

05. The design of shafts made of brittle materials is based on

A .Rankine's theory

06. A locking device extensively used in automobile industry is a

A .castle nut

07. A key way lowers

A .the strength and rigidity of the shaft

08. The bearing characteristic number in a hydrodynamic bearing depends upon

A .viscosity, speed and bearing pressure

09. The expansion joint is mostly used for pipes which carry steam at __________ pressures.

A .high

10. The included angle for the V-belt is usually

B.30°-40°

11. In static loading, stress concentration is more serious in

  

A.brittle materials

12. The piston pin bearings in heavy duty diesel engines are

  

A.needle roller bearings

13. Cast iron pipes are mainly used

A .in water and sewage systems

14. A feather key transmits a

A. turning moment and permits axial movement also.

15. The width of the pulley should be greater than

A . width of the belt.

16. The design of the pressure vessel is based on

A .hoop stress

17. For high speed engines, the cam follower should move with

  

A .cycloidal motion

18. Rankine's theory is used for

A .brittle materials

19. The objective of caulking in a riveted joint is to make the joint

A .leak-proof

  

20. The difference between the upper limit and lower limit of a dimension is called

A .tolerance

21. The algebraic difference between the actual size and the corresponding basic size is called

A. actual deviation.

22. Teflon is used for bearings because of

A.low coefficient of friction

23. The acme threads are usually found on

A .screw cutting lathes

  

24. When the fulcrum is in between the load and effort, the lever is said to be of

A .first type

25. The ball bearings are, usually, made from

A .medium carbon steel

26. A double strap butt joint (with equal straps) is

A .always in double shear

27. The modulus of elasticity for mild steel is approximately equal to

A .210 kN/mm2

28. A type of brake commonly used in motor cars is a

A .internal expanding brake

29. The centre to centre distance between two consecutive rivets in a row, is called

A .pitch

30. Which of the following property is essential for spring materials?

A .Resilience

31. A steel containing upto 0.15% carbon is known as

A .dead mild steel

32. The application of second type levers is found in

A .lever of a loaded safety valve

33. According to Indian standards, total number of tolerance grades are

A .18

  

34. An universal coupling is a type of __________ coupling.

A .flexible

35. The included angle for the British standard whitworth thread is

A .55°

36. Failure of a material is called fatigue when it fails

A .below the yield point

37. The transverse fillet welded joints are designed for

A .tensile strength

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