Machine Design

131. Whether any core is required in wire ropes

  1. yes
  2. no
  3. sometimes
  4. rarely
  5. very often.

Correct answer: (A)
yes

132. Which is correct statement ? Stress concentration in static loading is

  1. very serious in brittle materials and less serious in ductile materials
  2. very serious in ductile materials and less serious in brittle materials
  3. equally serious in both types of materials
  4. seriousness would depend on other factors
  5. none of the above.

Correct answer: (A)
very serious in brittle materials and less serious in ductile materials

133. Which is correct statement?

  1. a member made of steel will generally be more rigid than a member of equal load-carrying ability made of cast iron
  2. a member made of cast iron will generally be. more rigid than a member of equal load carrying ability made of steel
  3. both will be equally rigid
  4. which one is rigid will depend on several other factors
  5. none of the above.

Correct answer: (B)
a member made of cast iron will generally be. more rigid than a member of equal load carrying ability made of steel

134. Which is correct statement? Stress concentration in cyclic loading is

  1. very serious in brittle materials and less serious in ductile materials
  2. very serious in ductile materials and less serious in brittle materials
  3. equally serious in both types of materials
  4. seriousness would depend on other factors
  5. none of the above.

Correct answer: (C)
equally serious in both types of materials

135. Which of the following is a permanent fastening ?

  1. bolts
  2. keys
  3. cotters
  4. rivets
  5. screws.

Correct answer: (D)
rivets

136. Which of the following is not correct procedure to increase the fatigue limit

  1. cold working
  2. shot peening
  3. surface decarburisation
  4. under-stressing
  5. all of the above.

Correct answer: (C)
surface decarburisation

137. Which of the following pipe joints would be suitable for pipes carrying steam

  1. flanged
  2. threaded
  3. bell and spigot
  4. expansion
  5. compression.

Correct answer: (D)
expansion

138. Which process will increase the fatigue duration of parts ?

  1. finishing and polishing
  2. shot-peening
  3. decarburisation
  4. electroplating
  5. all of the above".

Correct answer: (B)
shot-peening

139. Yield point in fatigue loading as compared to static loading is

  1. same
  2. higher
  3. lower
  4. depends on other factors
  5. none of the above.

Correct answer: (C)
lower

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