Environmental Engineering

101.Limestone powder is injected during pulverised coal burning in boilers to _________ the flue gases.

1. Reduce SO₂ content in
2. Catalytically convert SO₂ to SO₃ in
3. Increase the dew point of
4. None of these

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102.Lung cancer&DNA breakage are the major ill effects of excessive ozone exposure to human beings. Ozone layer depletion in the atmosphere is mainly caused by the presence of

1. CO₂
2. SO₂
3. Hydrocarbons
4. CFC (chloro fluoro carbon)

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103.Main pollutant present in automobile exhaust is

1. CO
2. CO₂
3. NO
4. Hydrocarbons

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104.Main pollutants released from iron&steel industry is

1. CO, CO₂&SO₂
2. H₂S, NO&SO₃
3. CO₂, H₂S&NO₂
4. SO₃, NO₂&CO₂

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105.Main pollutants released from petroleum refineries is

1. CO, SO₂&H₂S
2. CO₂, NO&SO₂
3. CO₂, H₂S&NO₂
4. SO₂, NO₂&CO₂

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106.Major sources of noise in furnace operation arises from air inspirators, combustion, side wall vibrations and fluctuation in the process heat load. A 50% increase in fuel firing rate may increase the furnace noise level by about _________ decibels.

1. 3
2. 30
3. 7
4. 70

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107.Maximum allowable concentration of CO₂ in air for safe working is _________ ppm (parts per million).

1. 50
2. 1000
3. 2000
4. 5000

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108.Maximum allowable noise exposure limits for a man working for 8 hours a day in a noisy chemical plant is about _________ decibels.

1. 20
2. 60
3. 90
4. 120

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109.Maximum permissible concentration (i.e. TLV) of DDT in public water supply system is _________ micro gram (μ g)/litre.

1. 22
2. 42
3. 332
4. 1050

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110.Maximum permissible limit of industrial noise as recommended by World Health Organisation (WHO) is _________ decibels.

1. 35
2. 75
3. 95
4. 105

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