ASVAB Armed Services Vocational Aptitude Battery (#41)

Section: Automotive and Shop Information

The difference between a single-acting and an opposed piston engine is:

Single-acting piston engines wear longer.
Opposed piston engines have cylinders set in a V-shape.
Single-acting piston engines have one piston per cylinder and opposed piston engines have two.
Single-acting piston engines are used with carburetors and opposed piston engines are used with fuel injectors.