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MB4 > Review 3 > Flashcards

Review 3 Flashcards

(70 cards)

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1
Q

The accuracy of each stage of the oil analysis is ______ on the accuracy of the one previous

A

Dependent

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2
Q

Take the oil sample at mid tank or at a point midway between the exit and the entrance, not at the top or bottom of the tank. T or F

A

True

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3
Q

The filter is one of the best places to take an oil sample from

A

False

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4
Q

A test called _____ is commonly yaed to determine several conditions of lube oils and greases

A

Spectrographic analysis

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5
Q

Basic spectrographic analysis identifies wear metals and base elements in lubrication oils and greases

A

True

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6
Q

Primarily, ____ is looking for particles larger than 5 microns

A

Particle count analysis

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7
Q

Oxidation of oils is generally _______ by high operating temps

A

Accelerated

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8
Q

For pressurized oil systems, take oil sample when

A

While the machine is running

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9
Q

For non pressurized systems take the oil sample when

A

While the machine is running at its idle speed

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10
Q

Oxidation continues to be the most common form of oil degradation

A

True

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11
Q

The area of a circle that has a circumference of 15.7 inches is approximately?

A

19 5/8 sq.inches

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12
Q

A cone has a too with an area of two square inches, the bottom has an area 35% greater, what is the area of the bottom?

A

2.7 sq.inches

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13
Q

The mechanical advantage of a hydraulic jack is 280. What is the maximum weight it can lift with a force of 68 lbs?

A

19040 lbs

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14
Q

In a 2 cycle engine, a power stroke occurs in each cylinder

A

Every two strokes of the piston

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15
Q

In most oil pumps, the pressure regulator calve directs the excess oil in the

A

Oil pan

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16
Q

The distance travelled by the piston in its movement from BDC to TDC is called?

A

The stroke

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17
Q

In a four cycle engine, the piston moves from BDC to TDC during the

A

Exhaust stroke

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18
Q

What is one of the differences between 2 stroke and a 4 stroke diesel engine?

A

Two stroke has no intake valves

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19
Q

What is the purpose of the carburetor on a 2 stroke engine?

A

Provide the air fuel mixture

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20
Q

Which of the following is a poisonous gas produced by the gasoline engine?

A

Carbon monoxide

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21
Q

The diameter of an engine cylinder is called

A

Bore

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22
Q

An air cooled engine, the cooling air is directed around the cylinders by sheet metal forms called

A

Shrouds

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23
Q

The abbreviation used to describe the farthest upward travel point of the piston in the cylinder is called

A

TDC

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24
Q

The stroke of an engine is reffered to as

A

The distance traveled by the piston from TDC to BDC or from BDC to TDC

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25
During one complete cycle of a 4 cycle engine, the crankshaft rotates
720 degrees
26
The engine obtains its power from?
The expansion of gases
27
The ordinary four cycle engine gasoline has
Two valves for each cylinder
28
The shaft having lobes which operate engine valves is called?
Camshaft
29
What provides a large reservoir of gasoline at or near the engine?
Fuel tank
30
The mixtyre of air and gasoline burns during the
Powerstroke
31
What purpose does a Turbo charger serve on a diesel engine?
Engine power increased
32
Which one of the following is the most common type of governor used in a diesel engine
Mechanical
33
Which one of the following defines the removal of exhaust gases with incoming air?
Scavenging
34
What is the purpose of the transfer pump on a diesel engine
Transfers fuel from the tank to the injection pump
35
What causes ignition to take place in a diesel engine?
Heat from compression
36
How can a diesel engine be shut off when the governor fails to operate
Shut the fuel off
37
What is the difference in the compression stroke of a gasoline and diesel engine?
Only air is compressed in a diesel engine
38
Which problem occurs when the line of sight passes over hot objects
Distorted image
39
Which type of anchor bolt is used on bases subject to severe vibration?
Boxed
40
Why is concrete mix not used as a grout?
Shrinks when it sets
41
Which of the following is used to bring a base to an exact height before grouting?
Wedges
42
Which level uses optical principles to a reference line?
Builders
43
On how many directions should a piece of machinery should be levelled when using a machinist level?
2
44
When pouring a cement base that is to have a machine grouted to it, one precaution is to:
Leave the surface rough and level in 2 directions
45
Which device is used to center an instrument over a ground level benchmark
Plumb bob
46
Which type of ground will support the most weight?
Hard rock
47
Which type of the following holds re-bar in position during concrete pouring?
Tie wires
48
How many days must new concrete cure before it reaches 100% of its compressive strength?
28 days
49
Which terms refers to the amount of water used in concrete?
Consistency
50
What does a 1:2:4 designation mean when mixing concrete?
One part cement, two parts sand, four parts coarse aggregate
51
The backsight reading on a levelling rod is 6.35. The foresight reading is 9.17 feet. Complete the following statement. "The foresight is
2.82 lower than the backsight
52
What is the discrimination of an optical vernier micrometer?
0.0001"
53
A base is to be poured on an existing concrete floor, the procedure used to ensure that movement of the base will not occur is:
Cement roughening
54
A small base is to be poured in an existing plant. The locating lines are measured from:
Its edge distance from known reference points with a steel tape
55
One precaution when pouring grout is to provide for?
Air escape during pouring procedures
56
A slow speed reciprocating compressor and drive motor should be anchored to its foundation base using:
Boxed anchor bolts
57
When using double insulated tools, protection against shocks is provided by which of the following?
Plastic case or liner
58
What determines how severe an electric shock is?
Duration, amount, and path of current
59
Which of the following offers the least resistance of the flow of electricity?
A conductor
60
What current can be forced through a resistance of 20 ohms by a pressure of 220 volts?
11 amps E= I x R | I = E/R 220/20= 11
61
What is the horsepower of a motor which takes a current of 50 amps at 220 volts?
15 hp
62
What colour is the ground wire in a three wire 110 volt circuit?
Green
63
Which instrument is used to measure electric circuit current
Ampmeter
64
What is used to control the volume of air produced by a draft fan?
Inlet dampers
65
Which blade configuration is especially likely to pick up foreign materials?
Backward type
66
Which fan discharges combustion air to the boiler?
Forced draft
67
Which blade configuration would be used in an induced draft fan installation
Forward curve
68
Which type of draft system requires external cooling forcthe bearings lf the fan?
Induced
69
Which type of fan or rotor design is most commonly used for forced draft systems
Centrifugal
70
Where is the pump located when forced circulation is used in a boiler?
Between downcomers and risers

MB4 (5 decks)

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