- A. Z.H.ρ/L
- B. L/Z.H.ρ
- C. H.ρ/L
- D. Z.H/L.ρ
Process Equipment and Plant Design
-
In a rotary drier, the average retention time of solid is(where Z = length of the drier, metres ρ = apparent solid density, kg/m³ L = flow rate of dry solids, kg/see. m² drier cross-section H = hold up of solid.)
-
The thickness of heat transfer plates used in the plate type heat exchanger ranges from ______ mm, pressed in a single piece provided with grooves & corrugations.
- A. 0.3 to 0.8
- B. 1.25 to 3.125
- C. 3.5 to 7.0
- D. 8-12
-
______ of water makes it a widely used coolant in heat exchangers.
- A. Low corrosiveness
- B. Low dirt factor
- C. High specific heat
- D. Low viscosity
-
Compensation against openings in process vessels for giving inlet and outlet connections, for providing sight glasses and manholes etc. is provided for strength and rigidity. The most efficient type of compensation is of ______ type.
- A. Nozzle or rim
- B. Flared out
- C. Fluid in
- D. Ring plate
-
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
-
Le/D for 90° elbow (medium radius) and 90°square elbow would be respectively around_____.
- A. 25 and 60
- B. 3 and 5
- C. 100 and 250
- D. 250 and 600
-
In the case of a shell and tube heat exchanger, the logarithmic mean temperature difference_____.
- A. Is always less than arithmetic average value
- B. Is always more than arithmetic mean value and the geometric mean value
- C. Is always less than arithmetic mean value, but more than geometric mean value
- D. May be either more or less than geometric mean and arithmetic mean value depending upon whether the flow of stream is co-current or counter-current
-
Which of the following is used to set the diameter of the distillation column?
- A. Number of theorectical plates
- B. Static submergence
- C. Allowable vapour velocity
- D. Length of straight rectangular weir on cross-flow tray
-
Hole diameter of the seive trays in the distillation column ranges from ______ mm.
- A. L to 3
- B. 4 to 8
- C. 3 to 12.5
- D. 12.5 to 18.5
-
In packed towers provided with pall rings liquid redistributors are positioned at heights of every 6 metres or 5-10 times the column diameter, whichever is less. Maximum size of the pall rings should not exceed ______ of the column diameter.
- A. 1/10-1/15th
- B. 1/5-1/10th
- C. 1/20-1/30th
- D. 1/2 to 1/4th