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MCQs

Total Questions : 1628 | Page 8 of 163 pages
Question 71. The ratio of shear stress to shear strain is called
  1.    Bulk modulus
  2.    Shear modulus
  3.    Modulus of rigidity
  4.    Modulus of elasticity
 Discuss Question
Answer: Option B. -> Shear modulus
Question 72. For a 25 mm hole drilled in plates to be rivetted, the shank diameter of the rivet should be __________ mm.
  1.    25
  2.    23
  3.    26
  4.    27
 Discuss Question
Answer: Option B. -> 23
Question 73. In hydrostatic testing of welded pipe (for leakage, strength etc.) the ratio of minimum hydrostatic test pressure to internal design pressure is around
  1.    0.5
  2.    1.5
  3.    2.5
  4.    3.5
 Discuss Question
Answer: Option B. -> 1.5
Question 74. Tube side heat transfer co-efficient for turbulent flow of liquid through tubes is proportional to
  1.    G0.2
  2.    G0.5
  3.    G0.8
  4.    G1.5
 Discuss Question
Answer: Option C. -> G0.8
Question 75. With increase in temperature drop (in a shell and tube heat exchanger), the LMTD correction factor, FT
  1.    Decreases very rapidly
  2.    Increases very rapidly
  3.    Remains constant
  4.    Increases linearly
 Discuss Question
Answer: Option A. -> Decreases very rapidly
Question 76. Which of the following is not a valid assumption in continuous binary distillation for calculating the number of equilibrium stages by Mc-Cabe-Thiele's method?
  1.    Sensible heat changes for vapour & liquid are negligibly small
  2.    Reflux is not a saturated liquid
  3.    Molar latent heat of the two components are equal
  4.    Heat of mixing of normal liquid is assumed to be zero
 Discuss Question
Answer: Option B. -> Reflux is not a saturated liquid
Question 77. Pressure drop due to pipe fittings can be estimated by the equation, ΔP/p = 4f.Le/D.V2/2gc, where, Le = equivalent length of straight pipeline which will incur the same frictional loss as the fitting and D = diameter of the fitting. The value of Le/D (dimensionless) for 45° elbow and 180° close return bends would be respectively around
  1.    5 and 10
  2.    45 and 75
  3.    180 and 300
  4.    300 and 500
 Discuss Question
Answer: Option B. -> 45 and 75
Question 78. Practical dividing line between a ductile and brittle materials is suggested, when the ultimate elongation is about 5%. Generally, larger the knuckle radius, stronger is the corner torus section of a head. The knuckle radius provided should be less than __________ of the head.
  1.    6% of I.D.
  2.    3 times the thickness
  3.    Either A or B, whichever is larger
  4.    Either A or B, whichever is smaller
 Discuss Question
Answer: Option C. -> Either A or B, whichever is larger
Question 79. Most of the storage vessels/tanks are made cylindrical, because of the fact that a cylinder
  1.    Has greater structural strength
  2.    Is easy to fabricate
  3.    Both A & B
  4.    Neither A nor B
 Discuss Question
Answer: Option C. -> Both A & B
Question 80. Seamless pipe is made
  1.    From rolled strips formed into cylinders and seam-welded
  2.    By extrusion & casting into static and centrifugal molds
  3.    By forging a solid round, piercing it by simultaneously rotating & forcing it over a piercer point and further reducing it by rolling gas drawing
  4.    Both B and C
 Discuss Question
Answer: Option D. -> Both B and C

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