Related Questions

Pick out the wrong unit conversion of heat transfer co-efficient.
A 1 kcal/m2.hr.°C = 0.2048 BTU/ft2.hr.°F. = 1.163 W/m2.°K
B 1 kcal/m2.hr.°K = 1.163 W/m2.°C
C 1 W/m2.°C = 0.1761 BTU/ft2.hr.°F
D 1 BTU/ft2.hr.°F = 4.88 kcal/m2.hr.°C = 20.44 kJ/m2.hr°C = 5.678 W/m2.°C
Extended heat transfer surface like fins are used to increase the heat transfer rate. Fin efficiency is defined as the ratio of heat transferred across the fin surface to the theoretical heat transfer across an equal area held at the
A Surrounding temperature
B Average temperature of the fin
C Temperature of the fin end
D Constant temperature equal to that of the base
Pick out the wrong unit conversion of mass transfer co-efficient.
A 1 lb/hr.ft3.atm. = 4.8182 kg/hr.m2.bar
B 1 kg/hr.m2.atm= 0.98687 kg/hr.m.bar
C 1 lb/hr.ft2 = 4.8823 kg/hr.m2
D 1 kg/hr.m2 = 4.8823 lb/hr.ft2
Pick out the wrong conversion formula for the conversion of weight units :
A 1 tonne = 1000 kg = 22.046 lbs
B 1 U.S. ton = 907 kg = 0.907 tonne = 0.893 ton
C 1 ton = 2240 lbs = 1016 kg = 1.016 tonnes = 1.12 U.S. tons
D None of these
The scales form in heat exchanges after a period of operation and provide additional resistance to heat transfer with some heat transfer coefficient . The reciprocal of this scale heat transfer coefficient is called .
A scaling factor
B forming factor
C resisting factor
D fouling factor
Pick out the wrong unit conversion of calorific value.
A 1 kcal/kg = 1.8 BTU/lb = 4.186 kJ/kg
B 1 BTU/ft3 = 8.9 kcal/m3 = 0.038 MJ/m3
C 1 BTU/lb = 2.3 kcal/kg
D 1 kcal/m3 = 0.1124 BTU/ft3
Pick out the wrong unit conversion of temperature.
A °R = 273 + °F
B Temperature difference of 1°K = 1°C = $$\frac{9}{5}$$ °F
C °C = (F - 32) × 0.555
D °F = (°C + 17.778) × 1.8
Pick out the wrong unit conversion.
A 1 atm = 760 mm Hg = 29.92 inch Hg = 14.7 psi = 1.013 bar = 1.013 kgf/cm2
B 1 kPa = 100 bar
C 1 mm Hg = 1 torr = 133.3 Pa
D None of the above
Pick out the wrong unit conversion of thermal conductivity.
A 1 BTU/ft2.hr.°F/ft = 1.488 kcal/m2.hr.°C/m
B 1 BTU/ft2.hr.°F/inch = 1.488 kcal/m2.hr.°C/m
C 1 kcal/m.hr.°C = 0.672 BTU/ft.hr.°F = 1.163 W/m.°K
D 1 W/cm.°C = 85.985 kcal/m.hr.°C = 57.779 BTU/ft.hr.°F
For shell and tube heat exchanger, with increasing heat transfer area, the purchased cost per unit heat transfer area
A Increases
B Decreases
C Remains constant
D Passes through a maxima

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