A. (BTU/hr.ft2. °F)-1
B. (kcal/hr.m2.°C)-1
C. (W/m2.°K)-1
D. (kcal/hr. m. °C)-1
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 - The value of fouling factor depends upon the__________________?
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. - 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 - 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 - 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 - A single pass air heater is connected to a two pass unit. For the air flow rate and other conditions remaining the same, the film heat transfer co-efficient for air will vary in the ratio of_________________?
A. 2
B. 20.8
C. 20.2
D. None of these - Commercial packed scrubbers are normally designed for a pressure drop range of ______________ mm water column per metre of packed height?
A. 4-8
B. 17-34
C. 52-68
D. 88-105 - The operating pressure drop range in a bag filter is about ______________ mm water gauge?
A. 50-150
B. 5-10
C. 500-1500
D. 1500-2500 - The normal range of velocity of water in pipes is _______________ m/sec?
A. 0.1-0.5
B. 1-2
C. 10-50
D. 15-30 - Pressure drop (Δp) and the superficial gas mass velocity (G) in case of packed absorption tower operating in the preloading range are related as_________________?
A. Δp = G
B. Δp = G0.5
C. Δp = G2
D. Δp = 1/G0.6
