Poisonous fumes can enter a truck's cab due to: Question Poisonous fumes can enter a truck's cab due to: Answers A defective exhaust system. The wrong type of fuel being used. A lack of oil in the engine. Under-inflated tires. Explanation Defects in an exhaust system are very dangerous because they can cause poisonous fumes to enter the cab or sleeper berth. This questions appears in the following tests: District Of Columbia Double Illinois Class B Knowledge Test Minnesota HazMat North Dakota Class A Knowledge Test Tennessee Class A Knowledge Test Utah Passenger West Virginia Tank Wyoming Class B Knowledge Test
