Which of the following emissions in the exhaust gas of an I.C. engine causes the formation of photochemical smog ?

Related Mcqs:

1. Velocity of a gas in sound is not proportional to (where, T = Absolute temperature of the gas. P = Absolute pressure of the gas. y = Ratio of specific heats (Cp/Cv) ρ = specific weight of the gas) ?

   A. √T
   B. 1/√P
   C. √y
   D. 1/√ρ

2. ______________ the exhaust gas is an indication of the incomplete combustion of fuel?

   A. Low temperature of
   B. High temperature of
   C. High % of CO in
   D. High % of CO2 in

3. Work required for compression of a gas contained in a cylinder is 7000 kJ. During compression, heat interaction of 3000 kJ causes the surroundings to be heated. Internal energy change of the gas during the compression is __________________ kJ ?

   A. +4000
   B. -4000
   C. 10000
   D. -10000

4. A gas which is collected over water becomes moistened due to water vapor, exerts its own partial pressure at the gas temperature, which is termed as its_______________?

   A. Aqueous tension
   B. Saturated humidity
   C. Vapor pressure
   D. Absolute humidity

5. Volumetric composition of flue gas analysed with the Orsat apparatus is : CO2 = 12%, O2 = 8%, CO = nil, N2 = 80%. This flue gas composition indicates that_________________?

   A. Pure oxygen has been used for combustion
   B. Nitrogen percentage in the fuel is very high
   C. Excess air has been used for combustion
   D. Hydrogen is not present in the fuel

6. Which of the, following is not associated with the functioning of a petrol engine ?

   A. Compression ignition system
   B. Spark plug
   C. Carburettor
   D. Otto cycle

7. Which of the following performance characteristics of a S.I engine is not affected by the front end volatility of the petrol used ?

   A. Vapour locking
   B. Hot starting
   C. Spark plug fouling
   D. All A, B & C

8. In the formation of cermets, the ratio of ceramic material to metallic material is usually 80:20. Which of the following is a cermet ?

   A. Zirconia
   B. Alumina
   C. Bakelite
   D. Tungsten carbide

9. Alcohols are not suitable as diesel engine fuel because the cetane number of alcohols is____________________?

   A. Very low which prevents their ignition by compression
   B. Very high which prevents their ignition by compression
   C. Zero
   D. None of these

10. Air-petrol ratio in an automotive petrol engine is around ________________?

    A. 14 : 1
    B. 22 : 1
    C. 25 : 1
    D. 4 : 1