Machine Design

21. Belt slip may occur due to

  1. heavy load
  2. loose belt
  3. driving pulley too small
  4. all of the above
  5. none of the above.

Correct answer: (D)
all of the above

22. Brittle coating technique is used for

  1. determining brittleness
  2. protecting metal against corrosion
  3. protecting metal against wear and tear
  4. experimental stress analysis
  5. non-destructive testing of metals.

Correct answer: (D)
experimental stress analysis

23. Buttress threads are usually found on

  1. screw cutting lathes
  2. feed mechanisms
  3. spindles of bench vices
  4. screw jack
  5. railway carriage couplings.

Correct answer: (E)
railway carriage couplings.

24. Cap screws are

  1. similar to'small size tap bolts except that a greater variety of shapes of heads are available
  2. slotted for a screw driver and generally used with a nut
  3. used to prevent relative motion be-tween parts
  4. provided with detachable caps
  5. similar to stud.

Correct answer: (A)
similar to'small size tap bolts except that a greater variety of shapes of heads are available

25. Castle nut is a locking device in which

  1. one smaller nut is tightened over main nut and main nut tightened against smaller one by loosening, creating friction jamming
  2. a slot is cut partly is middle of nut and then slot reduced by tightening a screw
  3. a hard fiber or nylon cotter is recessed in the nut and becomes threaded as the nut is screwed on the bolt causing a tight grip
  4. through slots are made at top and a cotter pin is passed through these and a hole in the bolt, and cotter pin spitted and bent in reverse direction at other end
  5. none of the above.

Correct answer: (D)
through slots are made at top and a cotter pin is passed through these and a hole in the bolt, and cotter pin spitted and bent in reverse direction at other end

26. Coaxing is the procedure of increasing

  1. metal strength by cycling
  2. metal hardness by surface treatment
  3. metal resistance to corrosion by coating
  4. fatigue limit by overstressing the metal by successively increasing loadings
  5. none of the above.

Correct answer: (D)
fatigue limit by overstressing the metal by successively increasing loadings

27. Cold working

  1. increases the fatigue strength
  2. decreases the fatigue strength
  3. has no influence on fatigue strength
  4. alone has no influence on fatigue strength
  5. none of the above.

Correct answer: (A)
increases the fatigue strength

28. Elastic nut is a locking device in which

  1. one small nut is tightened over main nut and main nut tightened against smaller one by loosening, creating friction jamming
  2. a slot is cut partly in middle of nut and then slot reduced by tightening a screw
  3. hard fiber or nylon cotter is recessed in the nut and becomes threaded as the nut is stewed on the bolt causing a tight grip
  4. through slots are made at top and a cotter-pin is passed through these and a hole in the bolt, and cotter pin splitted and bent in reverse direction at other end
  5. none of the above,

Correct answer: (C)
hard fiber or nylon cotter is recessed in the nut and becomes threaded as the nut is stewed on the bolt causing a tight grip

29. Endurance limit or fatigue limit is the maximum stress that a member can withstand for an infinite number of load applications without failure when subjected to

  1. dynamic loading
  2. static loading
  3. combined static and dynamic loading
  4. completely reversed loading
  5. all of the above.

Correct answer: (D)
completely reversed loading

30. Eye bolts are used for

  1. foundation purposes
  2. locking devices *
  3. absorbing shock and vibrations
  4. transmission of power
  5. lifting and transportation of machines and cubicles.

Correct answer: (E)
lifting and transportation of machines and cubicles.

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