Lakshya Education MCQs

Question: A thin spherical shell of internal diameter d is subjected to an internal pressure p. If σt is the tensile stress for the shell material, then thickness of shell is equal to
Answer: Option D

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Question 1. The tension on the slack side of the belt is __________ the tension on the tight side of the belt.
  1.    Equal to
  2.    Less than
  3.    Greater than
  4.    None of these
Answer: Option B
Question 2. When the belt is transmitting maximum power, the belt speed should be (Where, m = mass of belt per meter (kg/m) and Pmax = maximum permissible tension in belt (N))
  1.    √(Pmax / 2m)
  2.    √(Pmax / 3m)
  3.    √(Pmax / m)
  4.    √(3m /Pmax)
Answer: Option B
Question 3. In order to have smooth operation, the minimum number of teeth on the smaller sprocket, for moderate speeds, should be
  1.    15
  2.    17
  3.    21
  4.    25
Answer: Option B
Question 4. A special case of ductility which permits materials to be rolled or hammered into thin sheets, is called
  1.    Plasticity
  2.    Elasticity
  3.    Ductility
  4.    Malleability
Answer: Option D
Question 5. A key capable of tilting in a recess milled out in a shaft is known as
  1.    Woodruff key
  2.    Feather key
  3.    Flat saddle key
  4.    Hollow saddle key
Answer: Option A
Question 6. For a shoe brake, the equivalent coefficient of friction is equal to (where μ = Actual coefficient of friction, and θ = Semi-block angle)
  1.    2μ sinθ/(θ + sinθ)
  2.    μ sinθ/(2θ + sin 2θ)
  3.    4μ sinθ/(θ + sinθ)
  4.    4μ sinθ/(2θ + sin 2θ)
Answer: Option D

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