A. Downcomer liquid seal in case of a balanced tray design
B. Static submergence in case of a bubble cap tray for column operating under pressure (≥ 1 atm)
C. Skirt clearance for bubble caps
D. All A., B. and C.
Related Mcqs:
- In case of plain carbon steel, butt welded joints are used for shell plate thickness ≤ _____________ cms?
A. 1.2
B. 0.5
C. 3.8
D. 6.8 - The ideal size of round bubble caps to be used in industrial distillation column having a diameter of 3-6 metres is ________________ cms?
A. 5
B. 15
C. 7.5
D. 50 - In a distillation column, minimum clearance to be maintained between the overflow weir and the last row of the bubble caps is ______________ cms?
A. 2.5
B. 7.5
C. 15
D. 20 - In case of bubble cap distillation column of diameter greater than 1.2 metres, the cap diameter is roughly about _______________ cms?
A. 10
B. 20
C. 30
D. 35 - Any shell opening greater than 5 cms for a storage tank must be reinforced for reason of ____________________?
A. Preventing the local overstressing of the shell around the opening
B. Reduction of discontinuity in shape at the junction
C. Making the joint leak proof
D. None of these - 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 - With increase in the reflux ratio for a fixed production from a continuous binary distillation column, the ______________________ decreases?
A. Fixed charges initially
B. Running cost of cooling water for condenser
C. Vapour & liquid load both
D. Running cost of steam for reboiler - The retention time of material in a rotary dryer depends upon its ______________________?
A. rpm
B. Slope & length
C. Flights arrangement
D. All A., B. and C. - 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 - 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.
