Thermal Environmental Engineering Objective Questions - Set 03 - ObjectiveBooks

Thermal Environmental Engineering Objective Questions - Set 03

Practice Test: Question Set - 03


1. Which of the following gases is having the widest explosion limit (about 2 to 81% gas in gas-air mixture), rendering it the property of the most explosive gas?
    (A) Hydrogen
    (B) Acetylene
    (C) Carbon monoxide
    (D) Ammonia

2. Very small amount of air pollutants are present in stratosphere also; though most of the atmospheric pollutants are present in the troposphere. Which of the following atmospheric pollutants does not cause the ozone layer depletion in atmosphere at tremendous rate?
    (A) CO
    (B) SO2
    (C) NOx
    (D) CFC (chloro fluoro carbons)

3. Maximum permissible limit of mercury in human blood is __________ micrograms/100 c.c.
    (A) 1
    (B) 7
    (C) 19
    (D) 82

4. For existence of aquatic life in water, the dissolved oxygen content in it, should not be less than __________ ppm.
    (A) 10000
    (B) 5
    (C) 500
    (D) 1000

5. Soluble silica present in boiler feed water can be removed by
    (A) Coagulation
    (B) Filtration
    (C) Anion exchanger
    (D) Preheating it

6. Threshold limit value (TLV) i.e., the maximum permissible safe limit of phosgene gas which Hitler used to use to kill his enemies in 'gas chamber' is about __________ ppm.
    (A) < 1
    (B) 10-100
    (C) 100-200
    (D) 100-1000

7. Presence of carbon monoxide in atmosphere produced by decomposition of chlorophyll and haemoglobin breakdown of some animals, beyond TLV (>50 ppm)
    (A) Acts as a green house gas thereby raising earth's temperature
    (B) Causes asphyxia
    (C) Causes increase in sea level
    (D) Enhances the green house effect

8. Smog is
    (A) Nothing but black smoke
    (B) A combination of smoke and fog
    (C) A liquid particle resulting from vapor condensation
    (D) A solid particle e.g. fly-ash

9. Fluorosis is caused due to the presence of excessive amount of __________ in drinking water.
    (A) Mercury
    (B) Lead
    (C) Fluoride
    (D) Arsenic

10. Noise pollution level in a chemical plant is expressed in
    (A) Roentgen
    (B) Decibel
    (C) Hertz
    (D) None of these

11. A considerable part of the harmful ultraviolet radiation of the sum does not reach the earth surface, because of the fact that, there is a layer of __________ high above earth's atmosphere, which absorbs it.
    (A) Hydrogen
    (B) Carbon dioxide
    (C) Ozone
    (D) None of these

12. Which of the following is not a weightless pollutant?
    (A) SPM
    (B) Thermal pollution
    (C) Radioactive rays
    (D) Noise pollution

13. Noise level inside a jet airliner in normal flight is about __________ decibels.
    (A) 80
    (B) 100
    (C) 125
    (D) 150

14. Noise level in a quiet private business office is about __________ decibels.
    (A) 25
    (B) 50
    (C) 70
    (D) 85

15. Aerosols present in atmospheric air may be
    (A) Positively charged
    (B) Negatively charged
    (C) Neutral
    (D) Combination of all (a), (b) & (c)

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