Question

7 multiple choice 1 point which engine component controls the opening and closing of intake and exhaust valves? the pistons the crankshaft the camshaft(s) the valve train control pinion 8 multiple answer 1 point the intake and exhaust valves are closed on which two strokes of the four stroke cycle? compression power intake exhaust

Explanation:

For question 7:

• Pistons are involved in the up - and - down motion within the cylinder for compression and power.
• Crankshaft converts the linear motion of pistons to rotational motion.
• Camshaft(s) use lobes to open and close intake and exhaust valves.
• Valve train control pinion is not a standard component for this function.

For question 8:

• In the intake stroke, the intake valve is open.
• In the exhaust stroke, the exhaust valve is open.
• In the compression stroke, both intake and exhaust valves are closed to compress the air - fuel mixture.
• In the power stroke, both valves are closed as the fuel - air mixture burns and forces the piston down.

Answer:

1. C. the camshaft(s)
2. Compression, Power