USCG USCG Motor
Set 11 • Question #70 of 382
Launch Interactive Practice Room Engines having a bore exceeding 250 mm, but not exceeding 300mm are to have at least_____________.
A
three compression rings per piston and the minimum of two oil scraper rings
B
one explosion relief valve in way of each alternate crank throw, with a minimum of two valves
✓ Correct Answer
C
one intake and one exhaust valve per cylinder provided no other means of scavenging is used
D
one crankshaft except in cases where an opposed piston design is required
USCG NMC Regulatory Explanation
In USCG Motor Plants (Diesel Engineering), regarding 'Engines having a bore exceeding 250 mm, but not exceeding 300mm are to have at least', the correct operational principle is: 'one explosion relief valve in way of each alternate crank throw, with a minimum of two valves'.
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