Question

internal combustion engines with two or more strokes are called ______ engines, meaning the pistons move in a back and forth motion within the cylinder.

a. rotary motion
b. recurring motion
c. multi - cylinder motion
d. reciprocating motion

Explanation:

The back - and - forth motion of pistons in a cylinder is known as reciprocating motion. Rotary motion is circular, recurring motion is general repetition, and multi - cylinder motion refers to multiple cylinders rather than piston motion type.

Answer:

D. Reciprocating motion