Stoichiometry

241. Pick out the wrong unit conversion of calorific value.

1. 1 kcal/kg = 1.8 BTU/lb = 4.186 kJ/kg
2. 1 BTU/ft3 = 8.9 kcal/m³ = 0.038 MJ/m³
3. 1 BTU/lb = 2.3 kcal/kg
4. 1 kcal/m³ = 0.1124 BTU/ft3

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242. Pick out the wrong unit conversion of heat transfer co-efficient.

1. 1 kcal/m².hr.°C = 0.2048 BTU/ft2.hr. °F. = 1.163 W/m².°K
2. 1 kcal/m².hr.°K = 1.163 W/m².°C
3. 1 W/m².°C = 0.1761 BTU/ft2.hr.°F.
4. 1 BTU/ft2.hr.°F = 4.88 kcal/m².hr.°C = 20.44 kJ/m².hr°C = 5.678 W/m².°C

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243. Pick out the wrong unit conversion of heat transfer rate.

1. 1 kcal/hr= 1.163 Watt
2. 1 Watt = 1.163 kcal/hr
3. 1 BTU/ft².hr = 2.712 kcal/m².hr
4. 1 kcal/m².hr = 0.3687 BTU/ft2.hr = 1.163 Watt/m²

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244. Pick out the wrong unit conversion of mass transfer co-efficient.

1. 1 lb/hr.ft³.atm. = 4.8182 kg/hr.m².bar
2. 1 kg/hr.m².atm= 0.98687 kg/hr. m .bar
3. 1 lb/hr.ft² = 4.8823 kg/hr.m²
4. 1 kg/hr.m² = 4.8823 lb/hr.ft²

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245. Pick out the wrong unit conversion of temperature.

1. °R = 273 + °F
2. Temperature difference of 1°K = 1°C = 9/5°F
3. °C = (F- 32) × 0.555
4. °F = (°C + 17.778) × 1.8

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246. Pick out the wrong unit conversion of thermal conductivity.

1. 1 BTU/ft2.hr.°F/ft = 1.488 kcal/m². hr.°C/m
2. 1 BTU/ft2.hr.°F/inch = 1.488 kcal/m². hr.°C/m
3. 1 kcal/m.hr.°C = 0.672 BTU/ft.hr.°F = 1.163 W/m. °K
4. 1 W/cm.°C = 85.985 kcal/m.hr.°C = 57.779 BTU/ft.hr.°F

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247. Pick out the wrong unit conversion.

1. 1 kgf= 9.8 Newton
2. 1 stoke = 1 m²/second
3. 1 Pascal second = 10 poise
4. 1 ppm = 1 ml/m³ = 1 mg/kg

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248. Presence of MgO in alumino-silicate refractories _________ its refractoriness.

1. Increases
2. Lowers
3. Does not affect
4. Either (A) or (B); depends on its quantity

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249. Pure aniline is evaporating through a stagnant air film of 1 mm thickness at 300 K and a total pressure of 100 KPa. The vapor pressure of aniline at 300 K is 0.1 KPa. The total molar concentration under these conditions is 40.1 mole/m³. The diffusivity of aniline in air is 0.74 × 10^-5m²/s. The numerical value of mass transfer co-efficient is 7.4 × 10^-3. Its units are

1. m/s
2. cm/s
3. mole/m².s.Pa
4. k.mole/m².s.Pa

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250. Pure aniline is evaporating through a stagnant air film of 1 mm thickness at 300 K and a total pressure of 100 KPa. The vapor pressure of aniline at 300 K is 0.1 KPa. The total molar concentration under these conditions is 40.1 mole/m³. The diffusivity of aniline in air is 0.74 × 10^-5m²/s. The numerical value of mass transfer co-efficient is 7.4 × 10^-3. The rate of evaporation of aniline is 2.97 × 10'^-4. Its units are

1. mole/s
2. mole/cm².s
3. mole/m² .s
4. k.mole/m².s

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