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Power Engineering- 4th Class > Chapter 72- Internal Combustion Engines > Flashcards

Chapter 72- Internal Combustion Engines Flashcards

1
Q

In a compression engine the fuel is ignited by

A

The compressed air temperature

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2
Q

Diesel engine governing is accomplished by

A

Varying the fuel quantity

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3
Q

Internal combustion engines used to drive gas compression machinery and which burn natural gas operate on the _______ stroke cycle

A

Two or four

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4
Q

How is fuel in a gasoline engine delivered?

A

An injector

A carburetor

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5
Q

What is a fuels resistance to premature detonation called?

A

Octane rating

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6
Q

Four-stroke cycle valves are operated

A

Cams

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7
Q

The purpose of a spark plug

A

To ignite the air fuel mixture in a gasoline engine

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8
Q

An engine which develops one power stroke with every other turn of the crankshaft is the

A

Four stroke natural gas engine

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9
Q

Four cycle engine lubrication may be accomplished by

A

Pumping oil under pressure

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10
Q 
An example of a gasoline engine which gives high torque at low speeds would be
A. chainsaw
B. two cycle snowmobile
C. four stroke motor cross motorcycle
D. two cycle lawnmower
E. two cycle transit bus
A

C

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11
Q

A major difficulty encountered with a two-stroke cycle engine is

A

Exhausting the spent gasses from the cylinder

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12
Q

When does the exhaust valve open on a four cycle engine

A

The end of the power stroke

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13
Q

A four stroke ignition engine in theory has ______ the power of a two stroke engine

A

Half

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14
Q

When does the spark plug ignite the air/fuel mixture in a four stroke engine

A

Near the end of the compression stroke

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15
Q

How many ports does a simple two stroke spark ignition engine have?

A

2

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16
Q

Define cylinder scavenging

A

The removal of exhaust gasses from a cylinder

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17
Q

Compression engines

A

Will compress air only on the compression stroke

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18
Q

An injection nozzle is used to _________ the fuel in a Diesel engine

A

Atomize

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19
Q

In larger two stroke Diesel engines how is scavenging air provided

A

With superchargers

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20
Q

The injection pump of a Diesel engine is driven by the

A

Camshaft

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21
Q

Ignition in a Diesel engine is started by

A

Compression in the cylinder

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22
Q

What is a diesels engines camshaft driven by?

A

The crankshaft

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23
Q

How high might the compression ratio of a Diesel engine be

A

25:1

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24
Q

What is the purpose of a pushrods in a typical four stroke Diesel engine?

A

To operate a rocker arm

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25
How might the frame of a Diesel engine be constructed?
Cast or welded
26
Using a compressed air starting motor is a popular method of starting a
Large stationary Diesel engine
27
When using compressed air to each cylinder for starting purposes, the pressure is approximately
2100 Kpa
28
Reduction in sealing qualities between the piston rings and cylinder wall by the lube oil may be a result of
High cooling water temperature
29
Large internal combustion engines achieve cooling by use of
Water jackets
30
In the case of large industrial Diesel engines which is started using compressed air direct to the cylinders, when is the air actually admitted to the cylinders
On the power stroke
31
In which ways might a Diesel engine be started
Hand cranking Air starter motor Electric starter Compressed air delivered to cylinders
32
What must be done before starting a large Diesel engine?
Prime the fuel injector pump
33
What problems could a leaking fuel injector cause in a Diesel engine?
Abnormally high exhaust temperatures | Smoky exhaust
34
VIGV
Variable pitch inlet guide vanes
35
I thermal combustion engines apply to all
Engines burning off fuel
36
Internal combustion changes chemical energy in fuel to
Useful heat
37
What are most common fuels used in an I thermal combustion engine
Natural gas Gasoline Light oil fuel Heavy oil fuel
38
Natural gas is considered
Environmentally clean
39
Natural gas is
Readily accessible
40
Gasoline is
Liquid hydrocarbons enhanced with benzene or Iso-octanes
41
Gasoline is ___ speed type
High
42
The process of vaporization is know as
Carburetion
43
Most modern engines now use
Direct fuel injection
44
Heavy oil fuel is important in what type of combustion engine
High compression engines
45
What are the for steps of a four struck ignition cycle
Intake Compression Power exhaust
46
How is the crankcase lubricated
Pumped under pressure or splashed
47
Two advantages of Four cycle engines
Good fuel economy and good control at all speeds
48
Two stroke ignition cycle had no
Valves or camshaft
49
How is two stroke engine lubricated
My mixing special lubrication with gasoline in the tank
50
In the carburetor the gasoline is
Vaporized
51
Two cycle engines are best for
Max power and min size. Best at high engine speeds
52
In a Diesel engines the fuel is injected at
High pressure directly into the engines cylinder in liquid form (finely atomized)
53
In Diesel engines ignition takes place with out the aid of a
Spark
54
List the four stages of a Diesel engine
Suction Compression Power Exhaust
55
In a two stroke Diesel engine removal is done by
Scavenging
56
What are the most common methods of air induction
Supercharges and turbochargers
57
Diesel engines use what type of ignition
Compression
58
Diesel engines have no
Carburetor
59
What does a carburetor do
Mix air and fuel
60
What are the moving parts in a Diesel engine
``` Piston Connecting rods Crank pins Crankshaft Main bearings ```
61
Diesel engine compression ratio
25:1
62
The fuel for a Diesel engine is
Mechanically atomized by high pressure
63
An example of an engine which gives high torque at low speeds would be that of a
Four stroke engine
64
The purpose of a spark plug is
To ignite the fuel air mixture in a gasoline engine
65
Using a compressed air starting motor is a popular method of starting a
Large stationary Diesel engine
66
When using compressed air to each cylinder for starting purpose the pressure is approximately
2100KPa
67
Reduction in sealing qualities between the piston ring and cylinder wall by the lube oil may be the result of
High cooling water temperatures

Power Engineering- 4th Class (27 decks)

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