Brainscape's Knowledge GenomeTM


Top Flashcards (Certified)
All Flashcards

Sait final review > Engines > Flashcards

Engines Flashcards

1
Q

The amount of air an engine is able to take into the cylinder compared with the volume of the cylinder is called?

A

Volumetric efficiency

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

The description of compression ratio is best stated as?

A

The cylinder volume plus the combustion chamber volume, divided by the combustion chamber volume

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

The SI metric system measures pressure in?

A

Pascals

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

When you are determining engine rotation using the SAE standard, the engine is viewed from?

A

The main power end of the engine

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Which type of head design has the valves in the block?

A

“L” head engine

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

The main reason for using chrome cylinder liners is for?

A

Reducing the rate of wear on the cylinders

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

To check for out of round in a cylinder you must measure?

A

In the ring travel area, 90 degrees and parallel to the crank

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Which liners are not exposed to engine coolant?

A

Dry liners

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

What is the most accurate method of checking bearing clearances?

A

Measure the shaft and bearings

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Piston rings fall into 2 major groups?

A
  • compression

- oil control

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Maximum torque will occur on an engine at what point?

A

At the best volumetric efficiency

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Deglazing of a cylinder with flexible hone promotes?

A

Good cylinder to ring lubrication.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

The crankshaft on most modern diesels are made from?

A

Forged alloy steel

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

The main cause of crankshaft deflection on large engine installations is?

A

Foundation that is crooked or uneven

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

The usable power that an engine actually delivers is, refers to as?

A

Brake horse power

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

The main reason for counter weights on the crankshaft is?

A

Counter weights, balances reciprocating forces.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

Valve clearance on a four stroke engine is normally adjusted with the piston at?

A

Top dead centre (TDC) compression stroke

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

Which engine part has the function of storing energy during the power pulses and then using that energy to carry the engine to the next power pulse?

A

Flywheel

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

An engine that has a larger stroke length then bore diameter is?

A

Under square

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

Running an engine without a thermostat would most likely cause?

A

Sludge

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

Abnormally high crankcase pressure could be caused by?

A

Scored cylinder

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

One sign that could be used to indicate a faulty spark plug in a running gas engine?

A

A cool exhaust manifold elbow

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
23
Q

Excessive side clearance between the piston ring and the ring groove will cause?

A

Ring breakage and excessive oil consumption

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
24
Q

The amount of contact on a dry liner is important for?

A

Correct heat transfer

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
25
Excessive valve lash could cause?
Insufficient scavenging
26
What can cause increased compression?
A build up of carbon in the combustion chamber
27
The in-line cylinder configuration has the advantage of?
A greater number of bearings to share the load
28
The quickest way to check the main bearing clearance is by?
Lift check
29
The mass of a stationary engine foundation should be how big?
2.5 times the mass of the complete engine
30
Which sensor would have the purpose of telling the computer the fuel is too rich or too lean?
Oxygen sensor
31
Excessive crankshaft deflection would cause?
Crankshaft fatigue
32
What fills the cylinder with air on a naturally aspirated engine?
Atmospheric pressure
33
When replacing piston oil rings ensure?
The rounded edge faces the top of the cylinder
34
What is always found in the cylinder head of an "I" head four stroke engine?
Valves, intake and exhaust passages
35
What is the purpose of the natural gas carburetor?
Proper air fuel (A/F) ratio
36
Which engine system uses the heat of a compressed gas for ignition?
Diesel engine
37
Abnormal oil consumption could be caused by?
Excessive valve guide clearance
38
How is an intake valve cooled in a typical industrial engine?
Intake air plus valve seat and valve guide contact
39
The piston compression ring which is least likely to stick is?
Keystone
40
The coolant in a pressurized system will have a boiling point ________ degrees higher for every ______psi
3 degrees F higher for every 1 psi
41
Which pistons will be fit looser in the cylinder than cast iron pistons and why?
Pure aluminum pistons because of the amount of expansion when heated
42
On a liquid cooled inline 4-stroke 8 cylinder Diesel engine the power pulse is located _________ degrees apart.
90 degrees.
43
In a 4-stroke engine the sequence of events would be?
Intake, compression, power, exhaust
44
If an engine has valve overlap of 30° this means that?
The intake valve opens 30° before the exhaust valve closes
45
Adding an intercooler to a turbocharged engine will?
Give a further power increase
46
A Waste gate (dump valve) is located?
Between the exhaust and the turbine
47
Which fuel is more susceptible to pre-ignition?
Gasoline
48
With normal combustion on an SI engine, ignition normally occurs?
When the spark is delivered, before TDC
49
If the exhaust valve is open while the intake valve is also open before and after TDC what happens?
Exhaust gas is being scavenged
50
On a diesel engine the governor controls the?
Fuel rack
51
Cylinder liner cavitation can be caused by?
Vibration
52
Engine knock (detonation) occurs when?
Two flame fronts colliding cause a rapid combustion of the fuel
53
Most cylinder wear occurs at the?
Top of ring travel
54
Spectra analysis program of engine oil will tell you?
The condition of the oil and engine wear
55
When starting a natural gas engine which has to be shut down for a few days, it should be barred over, doing this will?
Check for hydrostatic lock
56
Multi engine installations that have all the exhaust united into one manifold and muffler system can cause?
Condensation in the cylinder on the non-running engine
57
Work is expressed as?
As force unit times distance
58
How is heat removed from the piston in a diesel engine?
Oil spray and ring contact with cylinder walls
59
Setting the correct valve lash on a four stroke engine is best done?
After the intake valve closes
60
What is best used to set a natural gas A/F ratio?
Wideband oxygen sensor
61
What is the purpose of the converter on a LPG system?
Changes higher pressure liquid to lower pressure vapour
62
What is not required for a magneto type ignition system?
Battery
63
A sign that a diesel is running excessively cold is the emission of _________ smoke
White smoke
64
What does the stoichiometric mean as it relates to natural gas engines?
It is the chemically correct ratio to burn all of the oxygen and fuel
65
The primary circuit of a basic ignition circuit is?
The low-voltage part of the circuit
66
Pre-ignition occurs when, in the combustion process?
Before normal combustion
67
Lubrication for the cylinders of very large displacement engines can be accomplished with the use of?
Oil injection
68
What causes the air to flow through the carburetor on a natural gas engine?
Movement of the piston
69
What ratio does the camshaft turn in relation to the crankshaft in a four stroke engine?
1 to 2 (crankshaft in relation to camshaft would be 2 to 1)
70
High-octane fuel burns?
Slower (less volatile)
71
Too much fuel in carburetor is?
Rich
72
Too much air in carburetors is?
Lean
73
Valve over lap (4 stroke engine) takes place at the?
Start of the intake stroke
74
In a two stroke engine scavenging takes place?
After the power stroke
75
Valve face interference angle is sometimes used to apply?
Quick seating for initial start up after a valve job
76
What instrument is commonly used to check the crankcase ventilation system?
A manometer.
77
What does a pyrometer do?
It measures exhaust gas temperatures.
78
Best way to remove a ridge on a cylinder 6" or less is with?
Ridge reamer
79
Balanced manifold pressure is important?
To keep work being done by each cylinder constant.

Sait final review (4 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2025 Bold Learning Solutions. Terms and Conditions