Smoke is produced due to__________________?

Related Mcqs:

1. Sooty and sulphurous smog formed due to combustion of fossil fuels particularly in winter, continues throughout the day and night. When the moist atmospheric air’s water vapor condenses on the solid particles of smoke thereby forming smog (smoke + fog), it causes_________________?

   A. Poor visibility due to sky darkening
   B. Irritation in eyes
   C. Respiratory trouble
   D. All A., B. and C.

2. Ringelmann chart No. 2 corresponds to _______________ percent black smoke?

   A. 10
   B. 20
   C. 40
   D. 80

3. Black smoke coming out of the chimney of a furnace is an indication of the use of ______________ in the furnace?

   A. Low amount of excess combustion air
   B. Large quantity of excess combustion air
   C. Hydrocarbon fuel
   D. Pulverised coal as fuel

4. White smoke coming out of the chimney of a furnace indicates the use of_________________?

   A. Low excess air
   B. Very high excess air
   C. Gaseous fuel in the furnace
   D. Liquid fuel in the furnace

5. Noise produced by cooling fans (employed in air cooled heat exchangers or cooling tower) is mainly caused due to the turbulence created by blade passage through air. It can be reduced by use of a slower fan_________________?

   A. With greater number of blades
   B. Of increased diameter
   C. Both A. & B.
   D. Neither A. nor B.

6. High noise levels produced during operation of fans and compressors can be reduced by using__________________?

   A. Mufflers (silencers)
   B. Acoustic absorbent
   C. Lagging of noisy duct
   D. None of these

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. Nitrogen oxides (NOx) is not produced in the ______________ industry?

   A. Nitric acid making
   B. Nitrogenous fertiliser
   C. Detergent
   D. Any of these

9. Sound produced by an automobile horn heard at a distance of 1.5 metres corresponds to about ______________ decibels?

   A. 90
   B. 120
   C. 150
   D. 180

10. A masonry structure built below ground level, where biochemical reaction takes place due to anaerobic bacteria is called___________________?

    A. Cesspool
    B. Lagoon
    C. Skimming mill
    D. Septic tank