Chemical Engineering MCQs [Set 4]

31. Fatigue limit improvement by over stressing the metal by successively increasing the load is called coaxing. In fatigue failure, the material fails
(A) Below the yield point
(B) Above the yield point
(C) Below the elastic limit
(D) At the elastic limit

32. Addition of silicon to cast iron
(A) Promotes graphite module formation
(B) Improves its ductility
(C) Does not promote graphite flakes formation
(D) Increases the fluidity of molten metal

33. The materials which fracture even at small strains are termed as brittle, while those materials which exhibit an appreciable deformation before failure are termed as
(A) Rigid
(B) Tough
(C) Ductile
(D) Plastic

34. __________ is used as a material of construction for the blade of power saw.
(A) Wrought iron
(B) Stainless steel
(C) Mild steel
(D) High speed steel

35. A steam carrying pipeline is insulated with two layers of insulating materials with the inferior insulation material forming the inner part. If the two insulating layers are interchanged, the heat conducted will
(A) Increase
(B) Decrease
(C) Remain unaffected
(D) May increase or decrease; depends on the thickness of each layer

36. Pick out the wrong statement.
(A) Cold cracking of a weld is due to the presence of hydrogen gas in the weld
(B) True stress is given by, ζ = ζE (1 + εE), where ζE and εE are engineering stress and engineering strain respectively
(C) Phosphorous can be easily recovered in the iron blast furnace
(D) High residual stress at the surface is beneficial for fatigue properties of a material

37. The capacity of a spring to store energy is called the spring form co-efficient. Stiffness of a spring is measured by the
(A) Ability to absorb shock
(B) Capacity to store energy
(C) Ratio of the wire & coil diameters
(D) Load to produce unit deflection

38. The elastic strain energy of a unit length of an edge dislocation as compared to that of a screw dislocation is
(A) More
(B) Equal
(C) Less
(D) Double

39. Which of the following is not the function of a volute casing provided in a centrifugal pump?
(A) To reduce the head loss in discharge
(B) To increase the pump efficiency
(C) To collect liquid from the periphery of the impeller and to transmit it to the delivery pipe at constant velocity
(D) To increase the pump discharge rate

40. Pick out the wrong statement.
(A) For a pressure vessel to be classified as ‘thin vessel’, the ratio of wall thickness to mean radius is less than 0.1
(B) For calculating forces and efficiency of riveted joint, either rivet diameter or rivet hole diameter is used in case of pressure vessel and in structural work
(C) Longitudinal joint is normally made butt joint to maintain the circularity of the vessel
(D) Maximum diameter of the opening provided in a pressure vessel, which does not require any compensation is 200 mm

Updated: 30th June 2019 — 8:53 PM

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