POWER ENGINEERING 3B2 - CHAPTER
6 EXAM QUESTIONS AND ANSWERS.
VERIFIED 2026.
An example of an internal combustion engine is:
a. A diesel engine
b. A steam engine
c. A steam turbine
d. A gas turbine
e. An air compressor - ANS A
A two-stroke cycle engine has a power stroke every:
a. Two crank shaft revolutions
b. Four crank shaft revolutions
c. Crank shaft revolution
d. One half revolution
e. One half revolution - ANS C
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,The distinguishing characteristics of the gasoline engine
are________________________________________.
a. vaporized gasoline mixed with air is drawn into the cylinder during the intake stroke
b. ignition is achieved by means of a spark plug
c. governing takes place by throttling the air-fuel mixture
d. the fuel is injected at high pressure
e. four stroke cycle - ANS B
The major differences of the diesel engine compared to the gasoline engine are:
1) The charge drawn into the cylinder is air only
2) The fuel is injected at high pressure at the beginning of the compression stroke
3) Ignition is due to the high temperature resulting from the compression of the air
4) The fuel is injected at high pressure at the end of the compression stroke
5) The fuel is injected into the engine cylinder at a high temperature
a. 1, 3, 4
b. 2, 3, 4
c. 3, 4, 5
d. 1, 4, 5
e. 2, 4, 5 - ANS A
Scavenging is:
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,a. The supplying of air for combustion
b. The removal of exhaust gases from the cylinder
c. Used in all diesel engines
d. Usually used in four-stroke cycle engines
e. Recirculation of exhaust gases to reduce emissions - ANS B
A two-stroke cycle diesel engine:
a. Always has valves
b. Has difficulty removing exhaust gas from the cylinder
c. Are always of a uniflow type of action
d. Always use scavenging air
e. Requires oil mixed in the air for lubrication - ANS B
During the compression stroke of a diesel engine, the temperature may be as high as________.
a. 250°C
b. 350°C
c. 450°C
d. 650°C
e. 850°C - ANS D
The oil scraper ring in a diesel engine is located:
a. Above the compression rings
b. On the crank shaft
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, c. On the bottom portion of the piston
d. Next to the camshaft
e. In between the two compression rings - ANS C
The pistons used on a diesel engine are commonly made of _____ or _____.
1) stainless steel
2) aluminum alloy
3) carbon steel
4) cast iron
a. 1, 3
b. 1, 4
c. 2, 3
d. 1, 2
e. 2, 4 - ANS E
An engine that has a/an _____ has the oil contained within the engine crankcase.
a. wet sump type
b. dry sump type
c. gravity feed reservoir
d. outside storage
e. underground storage - ANS A
Cylinder liners in diesel engines are usually constructed of______________________.
4 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
6 EXAM QUESTIONS AND ANSWERS.
VERIFIED 2026.
An example of an internal combustion engine is:
a. A diesel engine
b. A steam engine
c. A steam turbine
d. A gas turbine
e. An air compressor - ANS A
A two-stroke cycle engine has a power stroke every:
a. Two crank shaft revolutions
b. Four crank shaft revolutions
c. Crank shaft revolution
d. One half revolution
e. One half revolution - ANS C
1 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
,The distinguishing characteristics of the gasoline engine
are________________________________________.
a. vaporized gasoline mixed with air is drawn into the cylinder during the intake stroke
b. ignition is achieved by means of a spark plug
c. governing takes place by throttling the air-fuel mixture
d. the fuel is injected at high pressure
e. four stroke cycle - ANS B
The major differences of the diesel engine compared to the gasoline engine are:
1) The charge drawn into the cylinder is air only
2) The fuel is injected at high pressure at the beginning of the compression stroke
3) Ignition is due to the high temperature resulting from the compression of the air
4) The fuel is injected at high pressure at the end of the compression stroke
5) The fuel is injected into the engine cylinder at a high temperature
a. 1, 3, 4
b. 2, 3, 4
c. 3, 4, 5
d. 1, 4, 5
e. 2, 4, 5 - ANS A
Scavenging is:
2 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
,a. The supplying of air for combustion
b. The removal of exhaust gases from the cylinder
c. Used in all diesel engines
d. Usually used in four-stroke cycle engines
e. Recirculation of exhaust gases to reduce emissions - ANS B
A two-stroke cycle diesel engine:
a. Always has valves
b. Has difficulty removing exhaust gas from the cylinder
c. Are always of a uniflow type of action
d. Always use scavenging air
e. Requires oil mixed in the air for lubrication - ANS B
During the compression stroke of a diesel engine, the temperature may be as high as________.
a. 250°C
b. 350°C
c. 450°C
d. 650°C
e. 850°C - ANS D
The oil scraper ring in a diesel engine is located:
a. Above the compression rings
b. On the crank shaft
3 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
, c. On the bottom portion of the piston
d. Next to the camshaft
e. In between the two compression rings - ANS C
The pistons used on a diesel engine are commonly made of _____ or _____.
1) stainless steel
2) aluminum alloy
3) carbon steel
4) cast iron
a. 1, 3
b. 1, 4
c. 2, 3
d. 1, 2
e. 2, 4 - ANS E
An engine that has a/an _____ has the oil contained within the engine crankcase.
a. wet sump type
b. dry sump type
c. gravity feed reservoir
d. outside storage
e. underground storage - ANS A
Cylinder liners in diesel engines are usually constructed of______________________.
4 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
