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MB4 > Review 3 > Flashcards

Review 3 Flashcards

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
Q

During one complete cycle of a 4 cycle engine, the crankshaft rotates

A

720 degrees

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26
Q

The engine obtains its power from?

A

The expansion of gases

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27
Q

The ordinary four cycle engine gasoline has

A

Two valves for each cylinder

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28
Q

The shaft having lobes which operate engine valves is called?

A

Camshaft

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29
Q

What provides a large reservoir of gasoline at or near the engine?

A

Fuel tank

30
Q

The mixtyre of air and gasoline burns during the

A

Powerstroke

31
Q

What purpose does a Turbo charger serve on a diesel engine?

A

Engine power increased

32
Q

Which one of the following is the most common type of governor used in a diesel engine

A

Mechanical

33
Q

Which one of the following defines the removal of exhaust gases with incoming air?

A

Scavenging

34
Q

What is the purpose of the transfer pump on a diesel engine

A

Transfers fuel from the tank to the injection pump

35
Q

What causes ignition to take place in a diesel engine?

A

Heat from compression

36
Q

How can a diesel engine be shut off when the governor fails to operate

A

Shut the fuel off

37
Q

What is the difference in the compression stroke of a gasoline and diesel engine?

A

Only air is compressed in a diesel engine

38
Q

Which problem occurs when the line of sight passes over hot objects

A

Distorted image

39
Q

Which type of anchor bolt is used on bases subject to severe vibration?

A

Boxed

40
Q

Why is concrete mix not used as a grout?

A

Shrinks when it sets

41
Q

Which of the following is used to bring a base to an exact height before grouting?

A

Wedges

42
Q

Which level uses optical principles to a reference line?

A

Builders

43
Q

On how many directions should a piece of machinery should be levelled when using a machinist level?

A

2

44
Q

When pouring a cement base that is to have a machine grouted to it, one precaution is to:

A

Leave the surface rough and level in 2 directions

45
Q

Which device is used to center an instrument over a ground level benchmark

A

Plumb bob

46
Q

Which type of ground will support the most weight?

A

Hard rock

47
Q

Which type of the following holds re-bar in position during concrete pouring?

A

Tie wires

48
Q

How many days must new concrete cure before it reaches 100% of its compressive strength?

A

28 days

49
Q

Which terms refers to the amount of water used in concrete?

A

Consistency

50
Q

What does a 1:2:4 designation mean when mixing concrete?

A

One part cement, two parts sand, four parts coarse aggregate

51
Q

The backsight reading on a levelling rod is 6.35. The foresight reading is 9.17 feet. Complete the following statement. “The foresight is

A

2.82 lower than the backsight

52
Q

What is the discrimination of an optical vernier micrometer?

A

0.0001”

53
Q

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:

A

Cement roughening

54
Q

A small base is to be poured in an existing plant. The locating lines are measured from:

A

Its edge distance from known reference points with a steel tape

55
Q

One precaution when pouring grout is to provide for?

A

Air escape during pouring procedures

56
Q

A slow speed reciprocating compressor and drive motor should be anchored to its foundation base using:

A

Boxed anchor bolts

57
Q

When using double insulated tools, protection against shocks is provided by which of the following?

A

Plastic case or liner

58
Q

What determines how severe an electric shock is?

A

Duration, amount, and path of current

59
Q

Which of the following offers the least resistance of the flow of electricity?

A

A conductor

60
Q

What current can be forced through a resistance of 20 ohms by a pressure of 220 volts?

A

11 amps E= I x R

I = E/R 220/20= 11

61
Q

What is the horsepower of a motor which takes a current of 50 amps at 220 volts?

A

15 hp

62
Q

What colour is the ground wire in a three wire 110 volt circuit?

A

Green

63
Q

Which instrument is used to measure electric circuit current

A

Ampmeter

64
Q

What is used to control the volume of air produced by a draft fan?

A

Inlet dampers

65
Q

Which blade configuration is especially likely to pick up foreign materials?

A

Backward type

66
Q

Which fan discharges combustion air to the boiler?

A

Forced draft

67
Q

Which blade configuration would be used in an induced draft fan installation

A

Forward curve

68
Q

Which type of draft system requires external cooling forcthe bearings lf the fan?

A

Induced

69
Q

Which type of fan or rotor design is most commonly used for forced draft systems

A

Centrifugal

70
Q

Where is the pump located when forced circulation is used in a boiler?

A

Between downcomers and risers

MB4 (5 decks)

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