MDE 5 Q5

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Question: In scroll type fuel injection pumps, how is fuel oil prevented from spraying out if the high-pressure pipe fails in service?

C) By incorporating a shut-off valve in the pump assembly

D) By utilizing a design that allows fuel to bypass the high-pressure pipe

B) By employing a safety valve that closes off the fuel supply

A) By using a pressure relief valve to divert excess fuel

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Question: In scroll type fuel injection pumps, how is the delivered quantity of fuel varied?

D) By altering the temperature of the fuel

A) By adjusting the rotational speed of the pump

C) By modifying the position of the scroll or cam mechanism

B) By changing the angle of the delivery valve

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Question: What is the purpose of the delivery valve in scroll type fuel injection pumps?

C) To prevent backflow of fuel from the high-pressure side to the low-pressure side

A) To regulate the fuel pressure before it enters the pump

B) To control the timing of the fuel injection

D) To filter contaminants from the fuel before it reaches the injector

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