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U.S.C.G. MERCHANT MARINE EXAM: MOTOR PLANTS (1) 2024/2025
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U.S.C.G. MERCHANT MARINE EXAM: MOTOR PLANTS (1) 2024/2025
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U.S.C.G. MERCHANT MARINE EXAM: MOTOR PLANTS (1)2024/2025
,U.S.C.G. MERCHANT MARINE EXAM: MOTOR PLANTS (1)
2024/2025
U.S.C.G. MERCHANT MARINE EXAM: MOTOR PLANTS (1)
2024/2025
The theoretical minimum compression ratio necessary to ensure compression
ignition in a direct
injection diesel engine is __________.
(A) 10:1
(B) 12:1
(C) 16:1
(D) 20:1 - Precise Answer ✔✔B
Modern marine diesel engines equipped with mechanical fuel injection operate on
a combustion
cycle which is __________.
(A) entirely constant volume
(B) entirely constant pressure
(C) a combination of constant volume and constant pressure
(D) a combination of constant temperature and constant pressure - Precise Answer
✔✔C
The power/expansion stroke shown in the illustration is indicated by the diagram
numbers
,U.S.C.G. MERCHANT MARINE EXAM: MOTOR PLANTS (1)
2024/2025
__________. Illustration MO-0025
(A) 1 through 3
(B) 1 through 4
(C) 3 through 6
(D) 4 through 6 - Precise Answer ✔✔A
The start of fuel oil injection into the cylinder of a four-stroke cycle diesel engine
occurs during the
__________.
(A) intake stroke
(B) exhaust stroke
(C) power stroke
(D) compression stroke - Precise Answer ✔✔D
If the piston stroke in a four-stroke cycle diesel engine is 10 1/2 inches and the
speed of rotation of
the crankshaft is 720 RPM, what is the average piston speed?
(A) 1200 feet/minute
(B) 1260 feet/minute
, U.S.C.G. MERCHANT MARINE EXAM: MOTOR PLANTS (1)
2024/2025
(C) 1320 feet/minute
(D) 1380 feet/minute - Precise Answer ✔✔B
of 37
Q531 Motor Plants I
Third Assistant Engineer
Q531 Motor Plants I
Illustrations: 21
Which of the following conditions would NOT be considered a valid reason for the
diesel engine to
operate in the area indicated by letter "B" shown in the illustration? Illustration
MO-0126
(A) Operating the vessel against high winds and current
(B) Operating with a fouled or damaged propeller
(C) Operating the vessel in shallow water
(D) Operating with minimal hull drag and under light draft - Precise Answer ✔✔D
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