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MCQs

Total Questions : 2607 | Page 9 of 261 pages
Question 81. A compound cylinder with inner radius 50 mm and outer radius 70 mm is made by shrinking one cylinder on to the other cylinder, the junction radius is 60 mm and the junction pressure is 1.1 N/mm². The maximum hoop stress developed in the inner cylinder is
  1.    3.6 N/mm² compression
  2.    3.6 N/mm² tension
  3.    7.2 N/mm² compression
  4.    7.2 N/mm² tension
 Discuss Question
Answer: Option C. -> 7.2 N/mm² compression
Question 82. Oil in journal bearing should be applied at the point where load is
  1.    Nil or lightest
  2.    Maximum
  3.    Average
  4.    Any one of the above
 Discuss Question
Answer: Option A. -> Nil or lightest
Question 83. Maximum principal stress theory is applicable for
  1.    Ductile materials
  2.    Brittle materials
  3.    Elastic materials
  4.    All of the above
 Discuss Question
Answer: Option B. -> Brittle materials
Question 84. Shear stress theory is applicable for
  1.    Ductile materials
  2.    Brittle materials
  3.    Elastic materials
  4.    All of the above
 Discuss Question
Answer: Option A. -> Ductile materials
Question 85. In the levers of __________ type, the mechanical advantage is less than one.
  1.    First
  2.    Second
  3.    Third
  4.    None of these
 Discuss Question
Answer: Option C. -> Third
Question 86. The surface finish factor for a mirror polished material is
  1.    0.45
  2.    0.65
  3.    0.85
  4.    1
 Discuss Question
Answer: Option D. -> 1
Question 87. The circumferential and longitudinal strains in a cylindrical boiler under internal steam pressure are εc and εl respectively. The change in volume of the boiler cylinder per unit volume will be
  1.    εc + 2εl
  2.    2εc + εl
  3.    εc + εl²
  4.    εc² + εl
 Discuss Question
Answer: Option B. -> 2εc + εl
Question 88. A screw is said to be over hauling screw, if its efficiency is
  1.    More than 50%
  2.    Less than 50%
  3.    Equal to 50%
  4.    None of these
 Discuss Question
Answer: Option A. -> More than 50%
Question 89. A screw is said to be a self locking screw, if its efficiency is
  1.    Less than 50%
  2.    More than 50%
  3.    Equal to 50%
  4.    None of these
 Discuss Question
Answer: Option A. -> Less than 50%
Question 90. The included angle for the British standard whitworth thread is
  1.    29°
  2.    47.5°
  3.    55°
  4.    60°
 Discuss Question
Answer: Option C. -> 55°

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