Poisonous fumes can enter the cab due to: Question Poisonous fumes can enter the 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: Illinois Tank Indiana Class B Knowledge Test Kansas Class B Knowledge Test Mississippi Class B Knowledge Test Montana Passenger Nebraska Class B Knowledge Test New York Passenger Oregon Double Pennsylvania Double Texas Class A Knowledge Test Texas Class B Knowledge Test West Virginia Class B Knowledge Test West Virginia Class B Knowledge Test Wisconsin Passenger
