24. The petrol engine is used alone when the vehicle is A. running at a constant speed B. applying brakes 2 C. over speeding 3 D. overtaking 4 -- / 1 Question 25 25. The additional power source in HEVs is the A. petrol engine B. engine 2 C. electric motor 3 D. transmission 4 26. The electric motor, functioning as a generator,gets its movement from the A. brakes 1 B. fuel tank 2 C. batteries 3 D. wheels 4