Mechanical Operations Mcqs for Chemical


Q.  Screw conveyors are________________?

a. Run at very high rpm
b. Suitable for sticky materials
c. Suitable for highly abrasive materials
d. All A., B. and C.


ANSWER: See Answer
 
No explanation is available for this question!
MCQs:  Two particles are called to be equal settling, if they are having the same ?
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MCQs:  For a non-spherical particle, the sphericity__________________?
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MCQs:  Velocity of a small particle of diameter ‘Dp’ at a distance ‘r’ from the rotational axis of a cyclone rotating at an angular speed ‘ω’ is given by (the other symbols are as per standard notation) ?
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MCQs:  Which of the following is the most suitable for cleaning of fine coal dust (<0.5 mm) ?
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MCQs:  Apron conveyors are used for ___________________ ?
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MCQs:  The ratio of the area of openings in one screen (Taylor series) to that of the openings in the next smaller screen is_________________?
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MCQs:  Which of the following is not a cutting machine ?
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MCQs:  The sphericity of a cylinder of 1 mm diameter and length 3 mm is_________________?
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MCQs:  Separation of materials into products based on the difference of their sizes is called___________________?
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MCQs:  Ultra centrifuges are used for the separation of _____________ solid particles?
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MCQs:  Sizing of very fine particles of the order of 5 to 10 microns is done by elutriation, which is a _____________ operation?
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MCQs:  Run of mine (ROM) coal is crushed by a _________________________ for use in domestic ovens?
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MCQs:  A sand mixture was screened through a standard 10-mesh screen. The mass fraction of the oversize material in feed, overflow and underflow were found to be 0.38, 0.79 and 0.22 respectively. The screen effectiveness based on the oversize is_________________?
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MCQs:  ____________ conveyor is the most suitable for long distance transportation of cold, nonabrasive granular/irregular shape/fine materials?
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MCQs:  ____________ mills fall in the category of tumbling mills ?
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MCQs:  Pulverised coal passing through 200 mesh screen has a diameter of 0.074 mm (74 micron). The same passing through 50 mesh screen will have a dia of ____________ mm?
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MCQs:  For Indian standard (IS) screens, the mesh number is equal to its aperture size expressed to the nearest deca-micron (0.01 mm). Aperture width of IS screen of mesh number 50 will be approximately _____________ microns?
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MCQs:  Which of the following is not categorised as a “mechanical operation”?
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MCQs:  Grinding characteristic of a material is given by its___________________?
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MCQs:  Ball mills and tube mills with flint or porcelain balls are used for size reduction of_______________?
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