46. You are assigned to a fishery research vessel fitted with main propulsion diesel engines operating on the cycle represented in the polar timing diagram shown in the illustration. When do the intake valves open and close respectively

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the intake valves open at 75° before top dead center on the exhaust stroke. the intake valves close at 45° after bottom dead center on the compression stroke.

46. You are assigned to a fishery research vessel fitted with main propulsion diesel engines operating on the cycle represented in the polar timing diagram shown in the illustration. When do the intake valves open and close respectively

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