Question 150Motor Plants - QMED

70% to pass

Fuel injection pumps using the port and helix metering principle requires the use of a _______________.

Acrosshatched design
Blapped plunger and barrel
Cvariable stroke
Dvariable cam lift
AI Explanation

The correct answer is B) lapped plunger and barrel. Fuel injection pumps using the port and helix metering principle require a lapped plunger and barrel design to precisely control the fuel delivery. The lapped surfaces between the plunger and barrel allow for a tight, leak-free fit that enables the accurate metering of fuel through the ports and helical grooves. This design is essential for the proper operation of port and helix fuel injection systems. The other options are incorrect because: A) crosshatched design is not specifically required for port and helix fuel injection pumps, C) variable stroke is not a necessary feature, and D) variable cam lift is not relevant to the fuel injection pump itself.

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Official Resources
46 CFR Machinery & Electrical 46 CFR Engineering USCG National Maritime Center
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