In a typical medium speed 4-stroke cycle diesel engine the inlet valve _____.

(a)    opens at 20° before top dead center and closes at 35° after the bottom dead center
(b)     opens at top dead center and closes at bottom dead center
(c)    opens at 10° after top dead center and closes 20° before the bottom dead center
(d)    may open or close anywhere
(e)    remains open for 200°.

Ans: a