Related Mcqs:

1. In a multiple effect evaporator system having ‘n’ effects, the amount of water evaporated per unit surface area in approximately equal to _____________ times that in a single effect?

   A. nth
   B. (1/n)th
   C. 0.5 nth
   D. 1.5 nth

2. Number of evaporators which can be used in service in a multiple effect evaporation system is limited by the__________________?

   A. Practical limit reached, due to low heat transfer rate because of inadequate temperature
   difference
   B. Economic limit reached, when the plant cost exceeds the saving of steam
   C. Both A. & B.
   D. Neither A. nor B.

3. 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?

   A. Two
   B. Five
   C. Ten
   D. Twenty

4. Multiple blade paddle agitator is used for mixing high viscosity liquids/paste in which the paddle diameter is commonly 0.8 times the tank diameter. However, the width of the blade is in the range of ______________ times the paddle diameter?

   A. 0.1 to 0.25
   B. 0.3 to 0.5
   C. 0.5 to 0.6
   D. 0.65 to 0.80

5. Poisson’s ratio of a material is the ratio of unit lateral strain to the unit axial elongation within its elastic limit. The value of Poisson’s ratio for structural and pressure vessel steel may be taken as ____________________?

   A. 0.01
   B. 0.3
   C. 0.75
   D. 0.95

6. If a single tube pass heat exchanger is converted to two passes; for the same flow rate, the pressure drop per unit length in tube side will _____________ times?

   A. Increase by 1.8
   B. Decrease by 22
   C. Increase by 21.6
   D. None of these

7. Low pressure steam (with saturation temperature between 105 to 120°C) is usually used in the vacuum evaporators, which normally employ a vacuum of about _______________ mm Hg (referred to a 760 mm mercury barometer)?

   A. 250
   B. 450
   C. 650
   D. 750

8. Steam side heat transfer co-efficient for design consideration under ordinary condition can be assumed to be about _____________ kcal/hr.m2.°C?

   A. 1250
   B. 2500
   C. 7500
   D. 15000

9. The normal range of velocity of steam in pipes is _________________________ m/sec?

   A. 0.1-0.5
   B. 1-5
   C. 10-20
   D. 80-100

10. In which of the following evaporators, steam is fed inside the tube while the liquor is outside the tube ?

    A. Long tube vertical evaporator
    B. Short tube vertical evaporator
    C. Horizontal tube evaporator
    D. None of these