Question

The shaft which raises and lowers the inlet and exhaust valves at proper time is

• A. Connecting rod
• B. Crankshaft
• C. Camshaft
• D. Timing gear

Hint:

Camshaft controls the opening and closing of inlet and exhaust valves in an engine.

Answer 1

The Correct Option is C

Concept:
In an internal combustion engine, valves must open and close at the correct time for proper intake and exhaust operations.

Step 1: The inlet valve allows air-fuel mixture or air to enter the cylinder.

Step 2: The exhaust valve allows burnt gases to leave the cylinder.

Step 3: The camshaft has cams which convert rotary motion into lifting motion of valves.

Step 4: As the camshaft rotates, it raises and lowers the inlet and exhaust valves at the required time.

Step 5: Hence, the shaft responsible for valve operation is the camshaft. \[ \boxed{\text{Camshaft}} \]