63. You are assigned to an OSV fitted with main propulsion diesel engines operating on the cycle represented in the polar timing diagram shown in the illustration. When do the exhaust valves open and close respectively

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the exhaust valves open at 55° before bottom dead center on the power stroke. the exhaust valves close at 85° after top dead center on the intake stroke.

63. You are assigned to an OSV fitted with main propulsion diesel engines operating on the cycle represented in the polar timing diagram shown in the illustration. When do the exhaust valves open and close respectively

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