Process Control & Instrumentation Mcqs for Chemical


Q.  The time taken for a radioactive element to reduce to 50% of its original weight is _____________ years, if its half life period is 12 years?

a. 24
b. 18
c. 6
d. 36


ANSWER: See Answer
 
No explanation is available for this question!
MCQs:  The LMTD correction factor (FT) is defined as the __________________?
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MCQs:  Which of the following is the best tube material from thermal conductivity point of view alone ?
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MCQs:  Power required for agitation depends upon the______________________?
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MCQs:  Stage efficiency for packed tower varies with the____________________?
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MCQs:  Tube wall thickness depends on the corrosiveness of the fluids and their operating pressure & temperature and is specified by Birmingham wire gauge (B.W.G)-a number which varies from 8 to 18 with the numbers 14 and 16 being more commonly used. Outside diameter of tubes varies from about 15 to 50 mm; however a tube of less than _____________ mm outside diameter is generally not recommended for fouling fluids ?
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MCQs:  In hydrostatic testing of welded pipe (for leakage, strength etc.) the ratio of minimum hydrostatic test pressure to internal design pressure is around __________________?
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MCQs:  In a shell and tube heat exchanger, the shortest centre to centre distance between the adjacent tubes is__________________?
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MCQs:  If ‘D’ is the inside diameter of the shell of a shell and tube heat exchanger, then the baffle spacing is usually in the range of__________________?
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MCQs:  For turbulent flow (NRe > 2100) of low viscosity fluid (μ > 20cp) in steel pipes, the optimum inside pipe diameter is given by(where, Q = fluid flow rate, ft3/sec, ρ = fluid density, lb/ft3 μ = fluid viscosity, centipoise Di = optimum inside pipe diameter, inches) ?
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MCQs:  Scale up problem in design based on the similarity concept takes into account _______________ similarity?
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MCQs:  The longitudinal stress induced in a thin walled cylindrical vessel under internal pressure is_________________?
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MCQs:  1.2 to 3.8 cms is the value of the ______________________?
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MCQs:  In a pressure vessel containing multiple openings of various dimensions at different parts, stress concentration at the edges of the opening is maximum which becomes negligibly small beyond the area covered by ______________ times the hole diameter?
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MCQs:  Removable connection of tubes to tube sheet is called___________________?
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MCQs:  Bubble cap tray is the most commonly used tray in large distillation column, because______________?
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MCQs:  (Le/D) for a Tee (used as elbow, entering run) would be around _______________________?
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MCQs:  At equal mass velocities, the values of film co-efficients for gases as compared to that for liquids are generally ?
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MCQs:  The design stress, which is more than the damaging stress, is the least unit stress that will render a member unfit for service before the end of its normal life. The design stress factor or factor of safety indicates the margin between design stress and the _______________ stress?
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MCQs:  Baffles are provided in a shell and tube heat exchanger to increase the turbulence and velocity of the shell side fluid. Which of the following shaped baffles does not fall in the category of transverse baffle ?
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MCQs:  Value of Peclet number = ∞, is the representative of___________________?
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