ABYC Practice Exam Questions &
Answers (Grade A+)
A sailboat's rigging is considered a reliable path to ground for
lightning? T/F? -
correct answer ✅FALSE. End fittings introduce the possibility of
high resistance. TE-4, Conductors
Gasoline engines use what kind of ignition? -
correct answer ✅Spark igntion Diesel Study Guide, Chapter 1
Diesel engines use what kind of ignition? -
correct answer ✅Compression ignition Diesel Study Guide,
Chapter 1
Spark ignition are what kind of engines? -
correct answer ✅Gasoline engines Diesel Study Guide, Chapter 1
Compression ignition are what kind of engines? -
correct answer ✅Diesel engines Diesel Study Guide, Chapter 1
How hot must a atomized diesel get before combustion? -
correct answer ✅750 degrees or more Diesel Study Guide, Chapter
1
,ABYC Practice Exam Questions &
Answers (Grade A+)
Cooler air is denser than ambient temperature? T/F? -
correct answer ✅TRUE, denser air has more oxygen molecules per
cubic foot Diesel Study Guide, Chapter 1
"One of the primary differences between the gasoline-fueled
engine four-stroke cycle and the diesel four-stroke cycle is:
A. The intake stroke only brings air into the cylinder.
B. The compression ratio of the diesel engine is much lower than
the same sized gasoline engine.
C. Fuel gets atomized by the high heat with a diesel engine.
D. The diesel fuel is more volatile than the gasoline." -
correct answer ✅A. The intake stroke only brings air into the
cylinder. Diesel Study Guide, Chapter 1
What is the tool to check engine back-pressure? -
correct answer ✅Manometer Diesel Study Guide, Chapter 2
When checking engine back-pressure, the engine must be under
load to get a valid reading. T/F? -
correct answer ✅TRUE Diesel Study Guide, Chapter 2
, ABYC Practice Exam Questions &
Answers (Grade A+)
"When choosing materials, we want them to be as close as possible
on the Galvanic Series. What is the recommended separation of
corrosion potential?
A. 200V
B. 2000mV
C. 200mV
D. 2V" -
correct answer ✅C. 200mV Diesel Study Guide, Chapter 2, pg 23
"In setting up a piping system for exhaust gases, the number of
sharp bends should be kept to a minimum to:
A. raise exhaust gas temperature.
B. permit use of a larger diameter pipe.
C. eliminate the need for a silencer.
D. prevent excessive exhaust back-pressure." -
correct answer ✅D. prevent excessive exhaust back-pressure.
Diesel Study Guide, Chapter 2
"An engine equipped with an exhaust-mixing elbow is installed
below the waterline. What device must be installed in the raw
water discharge hose ahead of the mixing elbow?
Answers (Grade A+)
A sailboat's rigging is considered a reliable path to ground for
lightning? T/F? -
correct answer ✅FALSE. End fittings introduce the possibility of
high resistance. TE-4, Conductors
Gasoline engines use what kind of ignition? -
correct answer ✅Spark igntion Diesel Study Guide, Chapter 1
Diesel engines use what kind of ignition? -
correct answer ✅Compression ignition Diesel Study Guide,
Chapter 1
Spark ignition are what kind of engines? -
correct answer ✅Gasoline engines Diesel Study Guide, Chapter 1
Compression ignition are what kind of engines? -
correct answer ✅Diesel engines Diesel Study Guide, Chapter 1
How hot must a atomized diesel get before combustion? -
correct answer ✅750 degrees or more Diesel Study Guide, Chapter
1
,ABYC Practice Exam Questions &
Answers (Grade A+)
Cooler air is denser than ambient temperature? T/F? -
correct answer ✅TRUE, denser air has more oxygen molecules per
cubic foot Diesel Study Guide, Chapter 1
"One of the primary differences between the gasoline-fueled
engine four-stroke cycle and the diesel four-stroke cycle is:
A. The intake stroke only brings air into the cylinder.
B. The compression ratio of the diesel engine is much lower than
the same sized gasoline engine.
C. Fuel gets atomized by the high heat with a diesel engine.
D. The diesel fuel is more volatile than the gasoline." -
correct answer ✅A. The intake stroke only brings air into the
cylinder. Diesel Study Guide, Chapter 1
What is the tool to check engine back-pressure? -
correct answer ✅Manometer Diesel Study Guide, Chapter 2
When checking engine back-pressure, the engine must be under
load to get a valid reading. T/F? -
correct answer ✅TRUE Diesel Study Guide, Chapter 2
, ABYC Practice Exam Questions &
Answers (Grade A+)
"When choosing materials, we want them to be as close as possible
on the Galvanic Series. What is the recommended separation of
corrosion potential?
A. 200V
B. 2000mV
C. 200mV
D. 2V" -
correct answer ✅C. 200mV Diesel Study Guide, Chapter 2, pg 23
"In setting up a piping system for exhaust gases, the number of
sharp bends should be kept to a minimum to:
A. raise exhaust gas temperature.
B. permit use of a larger diameter pipe.
C. eliminate the need for a silencer.
D. prevent excessive exhaust back-pressure." -
correct answer ✅D. prevent excessive exhaust back-pressure.
Diesel Study Guide, Chapter 2
"An engine equipped with an exhaust-mixing elbow is installed
below the waterline. What device must be installed in the raw
water discharge hose ahead of the mixing elbow?
