Design of Machine Elements MCQs with answers Page - 2

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Q. Which of the following is incorrect about tolerances?

  • (A) too loose tolerance results in less cost
  • (B) tolerance is a compromise between accuracy and ability
  • (C) too tight tolerance may result in excessive cost
  • (D) fit between mating components is decided by functional requirements

A

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Q. Quality control charts doesn’t depend on which factor?

  • (A) normal distribution
  • (B) random sampling
  • (C) independence between samples
  • (D) binomial distribution

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Q. If a clearance fit is present between shaft and hole, what is the tolerance on shaft or hole for a complete interchangeable approach?

  • (A) ½ of maximum clearance – ½ of minimum clearance
  • (B) ¼ of maximum clearance – ¼ of minimum clearance
  • (C) maximum clearance – minimum clearance
  • (D) ¾ of maximum clearance – ¾ of minimum clearance

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Q. A beam is said to be of uniform strength, if

  • (A) b.m. is same throughout the beam
  • (B) shear stress is the same through the beam
  • (C) deflection is the same throughout the beam
  • (D) bending stress is the same at every section along its longitudinal axis

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Q. Stress in a beam due to simple bending is

  • (A) directly proportional
  • (B) inversely proportional
  • (C) curvilinearly related
  • (D) none of the mentioned

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Q. Which stress comes when there is an eccentric load applied?

  • (A) shear stress
  • (B) bending stress
  • (C) tensile stress
  • (D) thermal stress

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Q. On bending of a beam, which is the layer which is neither elongated nor shortened?

  • (A) axis of load
  • (B) neutral axis
  • (C) center of gravity
  • (D) none of the mentioned

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Q. The bending stress is

  • (A) directly proportional to the distance of layer from the neutral layer
  • (B) inversely proportional to the distance of layer from the neutral layer
  • (C) directly proportional to the neutral layer
  • (D) does not depend on the distance of layer from the neutral layer

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Q. Consider a 250mmx15mmx10mm steel bar which is free to expand is heated from 15C to 40C. what will be developed?

  • (A) compressive stress
  • (B) tensile stress
  • (C) shear stress
  • (D) no stress

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Q. The safe stress for a hollow steel column which carries an axial load of 2100 kN is 125 MN/m2. if the external diameter of the column is 30cm, what will be the internal diameter?

  • (A) 25 cm
  • (B) 26.19cm
  • (C) 30.14 cm
  • (D) 27.9 cm

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