Question

identify the system that is used to remove blowby gases from the crankcase in an environmentally friendly manner.
a. evap system
b. pcv system
c. egr system
d. secondary air injection system

Explanation:

• EVAP system: It is mainly for collecting and storing fuel vapors from the fuel tank, not for crankcase blowby gases.
• PCV system (Positive Crankcase Ventilation): This system is designed to draw blowby gases (a mixture of unburned fuel, water vapor, and combustion by - products that escape past the piston rings into the crankcase) from the crankcase and re - introduce them into the engine's intake system for combustion, which is an environmentally friendly way of dealing with these gases.
• EGR system (Exhaust Gas Recirculation): It recirculates a portion of the engine's exhaust gas back to the engine cylinders to reduce nitrogen oxide emissions, not related to crankcase blowby.
• Secondary Air Injection System: It injects air into the exhaust system to promote the oxidation of unburned hydrocarbons and carbon monoxide, not for crankcase blowby.

Answer:

B. PCV system