In the illustrated polar timing diagram for...

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Question 1 of 205eccefa1bacbc34ba4d473d7

In the illustrated polar timing diagram for a four-stroke diesel engine, relative to the number of crank degrees before or after TDC or BDC as appropriate, when does the intake valve close? See illustration MO-0084.

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🔍 Key Concepts

• Four-stroke diesel cycle events: intake, compression, power, exhaust • How to read crank angle on a polar timing diagram (before/after TDC/BDC and direction of rotation) • Relationship between intake stroke and piston position when the intake valve opens and closes

💭 Think About

• Identify which colored band or ring represents the intake valve event, then trace it in the direction of crankshaft rotation until the valve just closes • Determine whether the piston is moving away from or toward TDC/BDC at that closing point, and whether the angle is measured before or after that dead center • Compare the crank angle number at the closing point with each answer choice, eliminating options that occur at the wrong dead center or in the wrong direction (before vs after)

✅ Before You Answer

• Confirm the direction of rotation shown by the arrow so you follow the timing arc correctly • Verify which radial ring corresponds to the intake valve (not exhaust or fuel injection) by looking at where it starts near TDC and extends past BDC • At the valve closing end of that arc, double-check whether the labeled angle is referenced to BDC or TDC, and whether it is before or after that point

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