A. Characteristic of process fluid
B. Velocity of process fluid containing suspended solids
C. Suspended solids in the fluid
D. All A., B. and C.
Related Mcqs:
- Tube wall thickness depends on the corrosiveness of the fluids and their operating pressure & temperature and is specified by Birmingham wire gauge (B.W.G)-a number which varies from 8 to 18 with the numbers 14 and 16 being more commonly used. Outside diameter of tubes varies from about 15 to 50 mm; however a tube of less than _____________ mm outside diameter is generally not recommended for fouling fluids ?
A. 16
B. 19
C. 28
D. 38 - 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 - Factor of safety (i.e., overdesign factor) in heat transfer equipments is about _____________ percent more than the actual/theoretical design factor?
A. 5-10
B. 15-20
C. 30-35
D. 35-40 - Cooling water fouling factors vary in the range of 0.001 to 0.003____________________?
A. (BTU/hr.ft2. °F)-1
B. (kcal/hr.m2.°C)-1
C. (W/m2.°K)-1
D. (kcal/hr. m. °C)-1 - When one of the fluids is highly corrosive and has fouling tendency, it should_____________________?
A. Preferably flow inside the tube for its easier internal cleaning
B. Preferably flow outside the tube
C. Flow at a very slow velocity
D. Flow outside the tube, when the flow is counter-current and inside the tube when the flow is
co-current - Power required for agitation depends upon the______________________?
A. Height & properties of the liquid
B. Agitator type & speed of agitation
C. Size of agitator & the tank
D. All A., B. and C. - Height equivalent to a theoretical plate (HETP) is the height of packing that will give the same separation as one theoretical plate in gas-liquid mass transfer operations like distillation, absorption/stripping and humidification/dehumidification. HETP which is experimentally determined, depends upon the_______________?
A. Flow rates of each fluid
B. Type and size of packing
C. Concentration of each fluid
D. All A, B. & C. - 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. - The force due to wind load acting on a tall vessel depends upon its___________________?
A. Shape
B. Outside diameter
C. Height
D. All A, B. & C. - The design stress, which is more than the damaging stress, is the least unit stress that will render a member unfit for service before the end of its normal life. The design stress factor or factor of safety indicates the margin between design stress and the _______________ stress?
A. Working
B. Damaging
C. Allowable
D. None of these
