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
Pick out the wrong unit conversion of heat transfer rate.
A 1 kcal/hr = 1.163 Watt
B 1 Watt = 1.163 kcal/hr
C 1 BTU/ft2.hr = 2.712 kcal/m2.hr
D 1 kcal/m2.hr = 0.3687 BTU/ft2.hr = 1.163 Watt/m2
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
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
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
The ratio of the actual mass of water vapour in a unit mass of dry air to the mass of water vapour in the same mass of dry air when it is saturated at the same temperature and pressure, is called
A Humidity ratio
B Relative humidity
C Absolute humidity
D Degree of saturation
According to the film theory of mass transfer, the mass transfer co-efficient is proportional to (where, D = molecular diffusivity)
A D
B D2
C D0.5
D $$\frac{1}{{\text{D}}}$$

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