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Engineering :: Environmental Engineering

71.  Which pollutants result from automobile exhaust?
A. Carbon monoxide B. Nitrous oxide
C. Hydrocarbons D. Sulphur dioxide
E. All of the above    
72.  The discharge of hydrocarbons from automobile exhaust is maximum when the vehicle is
A. Idling B. Cruising at low speeds
C. Accelerating D. Decelerating
E. Cruising at high speeds    
73.  The emission of carbon monoxide in automobile exhaust will be low when the vehicle is
A. Idling B. Cruising at low speed
C. Cruising at high speed D. Accelerating
E. Decelerating    
74.  The emission of oxides of nitrogen in automobile exhaust will be least when the vehicle is
A. Idling B. Cruising at low speed
C. Cruising at high speed D. Accelerating
E. Decelerating    
75.  Dark, black smoke from diesel engines usually results when engine is
A. Idling B. Running at slow speeds
C. Running at light loads D. Running at full speed but under load conditions
E. Running at full load and full speed    
76.  A blue smoke from a diesel engine indicates presence of
A. Nitrous oxide B. Carbon dioxide
C. Carbon monoxide D. Unburnt oil
E. Unburnt carbon    
77.  While smoke from a diesel engine can be expected during
A. Start up or idling B. High load operating
C. High speed operation D. All of the above
E. None of the above    
78.  Which of the following automobile will provide least pollution problems
A. Diesel engine powered B. Petrol engine powered
C. Gas turbine powered D. Wankel engine powered
E. Battery powered    
79.  Which of the following particles will be smallest in size?
A. Smog B. Rain
C. Drizzle D. Mist
E. Fog    
80.  The percentage of nitrogen in air by weight is around
A. 75.5 percent B. 65.5 percent
C. 24.3 percent D. 23.1 percent
E. 20.3 percent    

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