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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
Q

How might the frame of a Diesel engine be constructed?

A

Cast or welded

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26
Q

Using a compressed air starting motor is a popular method of starting a

A

Large stationary Diesel engine

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27
Q

When using compressed air to each cylinder for starting purposes, the pressure is approximately

28
Q

Reduction in sealing qualities between the piston rings and cylinder wall by the lube oil may be a result of

A

High cooling water temperature

29
Q

Large internal combustion engines achieve cooling by use of

A

Water jackets

30
Q

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

A

On the power stroke

31
Q

In which ways might a Diesel engine be started

A

Hand cranking
Air starter motor
Electric starter
Compressed air delivered to cylinders

32
Q

What must be done before starting a large Diesel engine?

A

Prime the fuel injector pump

33
Q

What problems could a leaking fuel injector cause in a Diesel engine?

A

Abnormally high exhaust temperatures

Smoky exhaust

34
Q

VIGV

A

Variable pitch inlet guide vanes

35
Q

I thermal combustion engines apply to all

A

Engines burning off fuel

36
Q

Internal combustion changes chemical energy in fuel to

A

Useful heat

37
Q

What are most common fuels used in an I thermal combustion engine

A

Natural gas
Gasoline
Light oil fuel
Heavy oil fuel

38
Q

Natural gas is considered

A

Environmentally clean

39
Q

Natural gas is

A

Readily accessible

40
Q

Gasoline is

A

Liquid hydrocarbons enhanced with benzene or Iso-octanes

41
Q

Gasoline is ___ speed type

42
Q

The process of vaporization is know as

A

Carburetion

43
Q

Most modern engines now use

A

Direct fuel injection

44
Q

Heavy oil fuel is important in what type of combustion engine

A

High compression engines

45
Q

What are the for steps of a four struck ignition cycle

A

Intake
Compression
Power
exhaust

46
Q

How is the crankcase lubricated

A

Pumped under pressure or splashed

47
Q

Two advantages of Four cycle engines

A

Good fuel economy and good control at all speeds

48
Q

Two stroke ignition cycle had no

A

Valves or camshaft

49
Q

How is two stroke engine lubricated

A

My mixing special lubrication with gasoline in the tank

50
Q

In the carburetor the gasoline is

51
Q

Two cycle engines are best for

A

Max power and min size. Best at high engine speeds

52
Q

In a Diesel engines the fuel is injected at

A

High pressure directly into the engines cylinder in liquid form (finely atomized)

53
Q

In Diesel engines ignition takes place with out the aid of a

54
Q

List the four stages of a Diesel engine

A

Suction
Compression
Power
Exhaust

55
Q

In a two stroke Diesel engine removal is done by

A

Scavenging

56
Q

What are the most common methods of air induction

A

Supercharges and turbochargers

57
Q

Diesel engines use what type of ignition

A

Compression

58
Q

Diesel engines have no

A

Carburetor

59
Q

What does a carburetor do

A

Mix air and fuel

60
Q

What are the moving parts in a Diesel engine

A 
Piston
Connecting rods
Crank pins
Crankshaft 
Main bearings
61
Q

Diesel engine compression ratio

62
Q

The fuel for a Diesel engine is

A

Mechanically atomized by high pressure

63
Q

An example of an engine which gives high torque at low speeds would be that of a

A

Four stroke engine

64
Q

The purpose of a spark plug is

A

To ignite the fuel air mixture in a gasoline engine

65
Q

Using a compressed air starting motor is a popular method of starting a

A

Large stationary Diesel engine

66
Q

When using compressed air to each cylinder for starting purpose the pressure is approximately

67
Q

Reduction in sealing qualities between the piston ring and cylinder wall by the lube oil may be the result of

A

High cooling water temperatures

Power Engineering- 4th Class (27 decks)

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