Mechanical Engineering Mcqs


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  • Pressure drop due to pipe fittings can be estimated by the equation, ΔP/ρ = 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______________________?
  • Fouling factor must be included in the calculation of overall design heat transfer coefficient, when the liquid__________________?
  • Overall tray efficiency of a distillation column is the ratio of the number of ___________________?
  • An increase in the liquid resistance to interphase mass transfer and a resultant reduction in plate efficiency is caused by______________?
  • Vertical condenser is advantageous to the horizontal condenser from operation point of view, when________________?

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