Chemical Engineering Basics

741. Wavelength of radiation emitted by a body depends on the __________ of its surface.

1. Temperature
2. Area
3. Nature
4. All 'a', 'b' & 'c'

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742. What happens, when SO2 is passed through a solution of H2S in water?

1. Precipitation of sulphur takes place
2. H₂SO₃ is formed
3. Oleum is formed
4. None of these

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743. What is the critical radius of insulation (cms) for a metallic cylinder, if the convective heat transfer co-efficient with the ambient atmosphere is 5 W/m². °K? Thermal conductivity of metal and insulation material are 40 and 0.1 W/m.°K respectively.

1. 2
2. 8
3. 10
4. 40

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744. What is the percentage of chromium in 18-4-1 high speed steel?

1. 1
2. 4
3. 18
4. 23

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745. What is the pH of distilled water?

1. 0
2. 1
3. 7
4. 14

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746. What is the range of tempering temperature (°C) for most of the materials?

1. 75-100
2. 200-300
3. 350-450
4. 500-600

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747. What is the value of entropy at 273°K?

1. 0
2. 1
3. ∞
4. None of these

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748. What is the value of included angle of a triangular notch for maximum discharge?

1. 30°
2. 60°
3. 90°
4. 120°

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749. When an isolated thermodynamic system executes a process,

1. Work is done
2. Heat transfer takes place
3. Mass flow occurs across the boundary of the system
4. No chemical reaction takes place within the system

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750. When dry bulb temperature & wet bulb temperature of moist air is the same, it means that the

1. Partial pressure of water vapour is less than the total pressure
2. Humidity is < 100% & dew point temperature of air has not reached
3. Dew point temperature of air has not reached & air is not saturated fully
4. Air is fully saturated

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