Chemical Engineering Basics

691. The units of the rate constant for a second order reaction are

1. Sec^-1. mole°
2. Moles¹. sec^-1
3. Moles^-1. sec¹
4. Moles¹. sec¹

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692. The usual energy consumption in electric arc furnace steel making is __________ KWh/ton of steel.

1. 60 - 100
2. 400 - 700
3. 1200 -1500
4. 2000 - 2300

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693. The value of y = c_b/c_v. at < 500°C for air & most common gases can be safely assumed to be

1. 0.8
2. 1
3. 1.4
4. 1.8

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694. The wet bulb temperature is lower in dry air than in wet air at the same temperature. A dry bulb thermometer registers a higher temperature than a wet bulb thermometer except at __________ percent relative humidity.

1. 0
2. 100
3. 50
4. None of these

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695. The yield point phenomenon observed in annealed low carbon steel is due to the presence of the following element.

1. Silicon
2. Carbon
3. Phosphorous
4. Chromium

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696. Theoretical volume of oxygen required for complete combustion of 1Nm3 of acetylene, in oxy-acetylene welding is __________ Nm3.

1. 0.5
2. 1
3. 43891
4. 2.5

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697. There are one octahedral void and __________ tetrahedral void in the closest packing of atoms.

1. One
2. Two
3. Three
4. None of these

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698. Thermal conductivity of a material does not depend upon its

1. Mass
2. Volume
3. Surface area
4. All 'a', 'b' & 'c'

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699. Thermal diffusivity of a substance is proportional to (where, k = Thermal conductivity)

1. 1/k
2. k
3. k²
4. 1/k²

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700. Thermal efficiency of an internal combustion engine is around __________ percent.

1. 8
2. 35
3. 65
4. 80

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