|
1) In a thin cylindrical shell, the hoop stress is ________________ stress? a. Radial b. Circumferential tensile c. Compressive d. Longitudinal
|
||||
|
2) Pressure drop per tray in the atmospheric distillation column is about ________________ psi? a. 0.01 – 0.5 b. 0.07 – 0.12 c. 0.5 – 1.0 d. 1 – 3
|
||||
|
3) n the agitators, the power required will be changed with the increase of diameter of agitator D. as ____________________? a. D2 b. D5 c. D d. D9
|
||||
|
4) Pick out the correct statement___________________? a. Centre to centre distance between two consecutives rivets in a row is called the pitch b. A riveted joint made in overlapping plates is called butt joint c. Hole size drilled in riveted plates is less than the actual size of the rivet d. None of these
|
||||
|
5) The circumferential (hoop) stress in a thin walled cylindrical vessel under internal pressure is______________________? a. pd/2t b. pd/4t c. pd/t d. pd/3t
|
||||
|
6) Vertical condenser is advantageous to the horizontal condenser from operation point of view, when________________? a. Hydrostatic head is required for refluxing the condensate b. Only the function of condensation is to be carried out c. Sub-cooling of condensate is desired d. Both the functions of condensation & sub cooling are carried out in a single unit
|
||||
|
7) An increase in the liquid resistance to interphase mass transfer and a resultant reduction in plate efficiency is caused by______________? a. An increase in liquid viscosity b. An increase in relative volatility for rectification columns c. Decrease in gas solubility for absorbers d. All A., B. and C.
|
||||
|
8) Overall tray efficiency of a distillation column is the ratio of the number of ___________________? a. Overall gas transfer units to the number of ideal trays required b. Ideal trays required to the number of real trays required c. Real trays required to the number of ideal trays required d. None of these
|
||||
|
9) Fouling factor must be included in the calculation of overall design heat transfer coefficient, when the liquid__________________? a. Containing suspended solids flows at low velocity b. Containing suspended solids flows at high velocity c. Is highly viscous d. Is of high specific gravity
|
||||
|
10) Which of the following is not a graphical method (but is an analytical method) for the calculation of theoretical number of stages in case of continuous binary distillation ? a. Sorel-Lewis method b. McCabe-Thiele’s method c. Ponchon-Savarit method d. None of these
|
||||
|
11) For storing hazardous chemicals in large storage tanks, the minimum safe distance between the two tanks should range between ______________________ times the tank diameter? a. 1 to 1.5 b. 2.5 to 3.5 c. 4 to 5 d. 6 to 8
|
||||
|
12) 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
|
||||
|
13) Rivets are generally specified by the____________________? a. Head diameter b. Shank diameter c. Overall length d. None of these
|
||||
|
14) Shortest distance between two tubes is___________________? a. Called tube pitch b. Called tube clearance c. More in case of triangular pitch as compared to square pitch of tube layout d. None of these
|
||||
|
15) Bubble cap plate column is___________________? a. A finite stage contactor b. Used only for distillation, not for absorption c. A differential stage contactor d. A continuous contactor
|
||||
|
16) 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
|
||||
|
17) With increase in temperature drop (in a shell and tube heat exchanger), the LMTD correction factor, FT_________________? a. Decreases very rapidly b. Increases very rapidly c. Remains constant d. Increases linearly
|
||||
|
18) The distance between the top of the slots and the liquid surface when the static liquid is just ready to flow over the overflow weir is called____________________? a. Downcomer liquid seal b. Static submergence c. Skirt clearance d. None of these
|
||||
|
19) Minimum recommended baffle spacing in a shell and tube heat exchanger is about (where, D = shell diameter) ? a. 0.2 D b. 0.5 D c. 0.66 D d. 0.80 D
|
||||
|
20) In a cylindrical vessel subjected to internal pressure, the longitudinal stress ζL and the circumferential stress, ζn are related by___________________? a. ζh = 2 ζL b. ζh = ζL c. ζh = ζL/2 d. No relation exists
|
||||
