In most four-stroke internal combustion engines, when does the piston move downward?
during the compression stroke only
during the compression and exhaust strokes
during the intake and exhaust strokes
during the power and intake strokes

Question

In most four-stroke internal combustion engines, when does the piston move downward?
 during the compression stroke only
 during the compression and exhaust strokes
 during the intake and exhaust strokes
 during the power and intake strokes

anonymous · Answer

During the power and intake strokes.

anonymous · Answer

Thank you, sir!

anonymous · Answer

In forced-air heating systems, where are warm-air vents usually located?
 above windows
 near the floor
 next to cold-air ducts
 under radiators