Valve Train Quiz

What is the primary function of the camshaft in a DOHC engine?

• To control the vehicle's exhaust system

• To open and close the intake and exhaust valves

• To regulate the fuel injection system

• To drive the engine's water pump

How often should the timing belt in a DOHC engine typically be replaced?

• Every 30,000 miles

• Every 60,000 to 100,000 miles

• Every 150,000 miles

• It never needs to be replaced

What is the main advantage of Variable Valve Timing (VVT) in DOHC engines?

• It reduces the need for regular maintenance

• It increases fuel efficiency by adjusting the timing of valve opening and closing

• It allows for a larger engine displacement

• It simplifies the engine design

Which component is directly driven by the camshaft in a DOHC engine?

• The crankshaft

• The pistons

• The valves

• The spark plugs

What does DOHC stand for?

• Dual Overhead Camshaft

• Double Operated Camshaft

• Dual Output Camshaft

• Double Overhead Crankshaft

What is the primary role of the timing belt in a DOHC engine?

• To drive the water pump

• To control the vehicle's speed

• To synchronize the rotation of the camshafts with the crankshaft

• To provide electrical power to the engine

What happens if the timing belt breaks while the engine is running?

• The engine will overheat

• The engine will continue to run at a reduced efficiency

• The engine will stop immediately, potentially causing engine damage

• The fuel efficiency of the engine will improve

Which of the following is a benefit of having a DOHC engine over a SOHC engine?

• Lower production cost

• Increased fuel efficiency and power

• Simpler timing belt replacement

• Reduced engine size

In the context of Variable Valve Timing, what does the term "phasing" refer to?

• The process of cooling the engine

• The synchronization of the fuel injection with the exhaust cycle

• The adjustment of the timing of valve opening and closing relative to the position of the piston

• The phase of engine operation when it switches from petrol to diesel

Why is it critical to replace the timing belt at the recommended intervals?

• To ensure the air conditioner continues to work efficiently

• To prevent potential severe engine damage due to belt failure

• To improve the sound system quality in the vehicle

• To increase the top speed of the vehicle