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
Related Mcqs:
- Heat transfer co-efficient for a horizontal condenser as compared to a vertical condenser operating under similar conditions is_______________?
A. Same
B. Less
C. About 3 times
D. About 0.33 times - For identical situation, condensing film coefficient in case of a horizontal condenser is almost ______________ the value expected in case of vertical condenser?
A. Half
B. Twice
C. Thrice
D. Five times - Which of the following types of reactors is the safest from operation point of view ?
A. A vapor phase reactor
B. Pot type reactor
C. A liquid phase reactor
D. A liquid phase catalytic reactor - In condenser, the cooling water is passed in the tube side in a pass arrangement, because________________?
A. It reduces heat transfer area
B. More thinner tubes can be used
C. Pressure drop is reduced
D. It makes condenser compact - Pick out the wrong statement pertaining to the design of a horizontal tube evaporator ?
A. It is unsuitable for concentrating those liquids, which form a scale or deposit salt
B. It is suitable for process, in which the final product is a liquor instead of solid
C. Its usual dimensions are: tube dia = 2-3 cms; evaporator body dia = 1-4 metres and evaporator
height = 2.5-4 metres
D. Liquor flows inside the tube, while the steam is outside submerging the tube - Cylindrical pressure vessels in horizontal condition is generally supported on a ________________ support?
A. Lug
B. Skirt
C. Saddle
D. Guy wire - Pick out the wrong statement pertaining to the design of a long tube vertical evaporator ?
A. Tube dia is 3-6 cms, while tube length in 3-6 metres
B. Steam is fed to the shell, whereas the liquor is filled inside the tube
C. Liquor level is maintained at 1/3rd to 1/2 of the height of the tube
D. None of these - Pick out the wrong statement. In an agitated vertical cylindrical reaction vessel, the___________________?
A. Ratio of liquid depth to tank diameter (i.e. the filling ratio) recommended for most purposes is 1
B. Filling ratio for dispersing gas in a liquid is 2 for sufficiently long contact period
C. Flat bottom and conical bottom vessels have low agitation efficiency for agitation of heavy solids in liquids
D. Dished bottom vessel has very high power consumption - ________________ liquor is best handled in a long tube vertical evaporator ?
A. Foamy
B. Scaling
C. Viscous
D. Salting - In a vertical short tube evaporator (Calandria type), the ______________________?
A. Tube dia of 2.5-7.5 cms, tube length of 75-200 cms and cylindrical drum dia of 1-6 metres are
normally used
B. Area of central downtake is equal to 40 to 100% of total cross-sectional area of the
surrounding tube
C. Liquor is inside the tube while the steam is outside the tube
D. All A., B. & C.
