Which of the following types of valves have a valve stem that moves up and down in a valve guide? Select one: a. Poppet valves b. Reed valves c. Check valves d. All of the above.

Poppet valves are the one whose valve stem moves up and down in a valve guide.

Answer: A

Explanation

Poppet valve is used for controlling the flow of fluid in the engine.

The valves are present inside a cylindrical structure from where the fluids will get inserted or exhausted.

The timing of input and output as well the quantity of input and output is maintained by Poppet valve.

The valve consists of a large metal plate connected with a long metal rod.

The metal rod is termed as valve stem which is present in the valve guide.

The valve stem will be moving up and down to insert and exhaust the gases respectively in an internal combustion engine.

Answer:c

Explanation:

thats wht it is