Question

when disabling a cylinder during a power balance test, what indicates a correctly operating cylinder?
select one:
o a. no rpm drop
o b. the engine speeds up
o c. a substantial rpm drop
o d. the engine runs smoothly

Explanation:

In a power - balance test, when a cylinder is disabled, a properly operating cylinder contributes to the engine's power. So, disabling it should cause a noticeable change. A non - operating cylinder (like option a: no RPM drop) would not contribute, so no change. Option b (engine speeds up) is incorrect as disabling a working cylinder should reduce power, not increase speed. Option d (engine runs smoothly) is not a sign of a single cylinder operation as smooth running could be due to multiple factors. A substantial RPM drop (option c) indicates that the disabled cylinder was contributing to the engine's power output, meaning it was operating correctly.

Answer:

C. A substantial RPM drop