During which of the following operating conditions of an automobile, carbon monoxide content in the exhaust gas is maximum ?

Related Mcqs:

1. Catalyst used in the ‘catalytic converter’ employed in automobile exhaust line for complete combustion/oxidation of carbon monoxide, nitrogen oxides and hydrocarbons is__________________?

   A. Alumina
   B. Platinum
   C. Vanadium pentoxide
   D. Iron oxide

2. ‘Safe limit’ called Threshold Limit Value (TLV) of carbon monoxide in atmospheric air is < 50 ppm. The main source of carbon monoxide pollutant in air is the____________________?

   A. Industrial chimney exhaust
   B. Automobiles exhaust
   C. Photochemical reaction in polluted atmosphere
   D. Burning of domestic fuel

3. The combustion equations of carbon and carbon monoxide are as follows: C + O2 = CO2, ΔH = – 394 kJ/kg .mole CO + ½ O2 = CO2, ΔH = – 284.5 kJ/kg. mole. The heat of formation of CO is _____________ kJ/kg. mole?

   A. -109.5
   B. +109.5
   C. +180
   D. +100

4. Photochemical smog is formed from automobile exhaust ________________?

   A. By reaction of hydrocarbon & nitric oxide in presence of sunlight
   B. Appears only on sunny days
   C. Is harmful for crops and trees also besides causing eye irritation & asthma
   D. All A., B. & C.

5. Automobile exhaust is passed through two compartments catalytic converter employing platinum as catalyst for___________________?

   A. Conversion of CO into CO2 in the second compartment
   B. Conversion of NOx into N2 and NH3 in the first compartment
   C. Oxidation of unburnt hydrocarbon fuel in the second compartment
   D. All A., B. and C.

6. Inhalation of lead compounds present in automobile exhaust (using leaded petrol) causes__________________?

   A. Blood poisoning
   B. Anaemia
   C. Nervous system disorder
   D. All A., B. & C.

7. Main pollutant present in automobile exhaust is_________________?

   A. CO
   B. CO2
   C. NO
   D. Hydrocarbons

8. 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

9. Carbon monoxide is a pollutant, which causes_________________?

   A. Respiratory disease (e.g. asthma)
   B. Asphyxiation (suffocation) leading to death
   C. Retardation in crop growth
   D. Damage to building materials like marble

10. On prolonged exposure to high concentration of carbon monoxide (> 5000 ppm), man dies because __________________?

    A. Of clotting of blood
    B. Of jamming of respiratory tract
    C. It forms carboxyhemoglobin by combining with haemoglobin of blood, thereby making it
    incapable of absorbing oxygen
    D. It forms CO2 by combining with oxygen present in the blood