Chemical Engineering Basics

421. Minimum temperature upto which water can be theoretically cooled down in the cooling tower by evaporative cooling is equal to the __________ temperature of air.

1. Wet bulb
2. Dry bulb
3. Saturation
4. Dew point

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422. Minimum thermal efficiency of a steam boiler may be around __________ percent

1. 25
2. 45
3. 65
4. 20

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423. Moist air is cooled along the line of constant __________ , when it is passed over a cold & dry cooling coil, such that no condensation occurs?

1. Enthalpy
2. Relative humidity
3. Wet bulb temperature
4. Dew point temperature

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424. Moist climate is the most favourable factor in the site selection far a

1. Steel plant
2. Textile factory
3. Petroleum refinery
4. Coke oven battery

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425. More than 95% of __________ is present in corundum.

1. SiO_a
2. Al_aO₃
3. CaSiO_a
4. MgO

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426. Most important property of steels for use in automobile bodies is the

1. Formability
2. Yield strength
3. Toughness
4. Resilience

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427. Most of the phosphorous present in the blast furnace burden enters into

1. Hot metal
2. Flue gases
3. Slag
4. Refractory lining

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428. Multistage compression of air as compared to single stage compression offers the advantage of

1. Power saving per unit weight of air delivered
2. Moisture elimination in the inter-stage cooler
3. Increased volumetric efficiency
4. All (A), (B) & (C)

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429. Name the safety device used to protect the boiler, when the water level falls below a minimum level.

1. Blow down valve
2. Blow off cock
3. Fusible plug
4. Safety valve

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430. Natural water contains approximately __________ percent of heavy water.

1. 0.015
2. 0.71
3. 1.2
4. 3.5

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