Top 50+ Solved Engine Emission and their Control MCQ Questions Answer
Q. The major contributor of Carbon monoxide is
a. Motor vehicle
b. Industrial processes
c. Stationary fuel combustion
d. None of the above
Q. Apart from hydrocarbons, the main pollutants in the engine exhaust are
a. CO and CO2
b. CO2 and NOx
c. CO and NOx
d. CO2 and H2O
Q. Maximum allowable hydrocarbon in the car emission are approximately
a. 10 ppm
b. 100 ppm
c. 1000 ppm
d. 5000 ppm
Q. The PCV (Positive Crankcase Ventilation) valve is located between the
a. Air cleaner and the carburetor
b. Carburetor and the intake manifold
c. Intake manifold and air cleaner
d. Intake manifold and crankcase
Q. In case of engines backfiring, the PCV valve:
a. Opens maximum
b. Closes
c. Disintegrates
d. Sticks in the centre position
Q. The position of the PCV valve plunger at idle speed is
a. Towards the valve outlet side
b. Towards the valve inlet side
c. Towards the crankcase
d. Near the valve centre
Q. The function of charcoal granules is to absorb:
a. Water vapour
b. Carbon monoxide
c. Petrol Vapour
d. Liquid petrol
Q. The liquid – vapour separator is located near the
a. Fuel tank
b. Carburettor
c. Charcoal canister
d. Purge valve
Q. EGR (Exhaust Gas Recirculation) system is employed for controlling emissions of:
a. HC
b. CO
c. NOx
d. HC and CO
Q. The main purpose of the diverter valve in the air injection system is to
a. Close the check valve
b. Prevent back fire in the exhaust system
c. Prevent backfire in the inlet manifold
d. Weaken the air-fuel mixture
Q. The catalyst used in the converter for oxidizing HC and CO is
a. Copper
b. Charcoal
c. Rodium
d. Platinum
Q. The air fuel ratio required for the efficient operation of a three approximately
a. 5:1
b. 10:1
c. 15:1
d. 20:1S