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MB4 > Review > Flashcards

Review Flashcards

1
Q

Characteristics of a 3 phase motor?

A

Easily reversed

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2
Q

Accuracy of a precision level?

A

.005”

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3
Q

Accuracy of an optical precision level?

A

.001”

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4
Q

What type of unbalance is a combination of static and couple unbalance?

A

Quasi-static

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5
Q

Displacement is measured in?

A

Mils

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6
Q

What opens an intake valve?

A

Cam lobe, or Vacuum of piston?

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7
Q

Diesel engine smoking black, what should be checked first?

A

Air filter

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8
Q

Order of stroke in 4 stroke engines

A

ICPE, intake-compression-power-exhaust

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9
Q

Purpose of a turbo charger?

A

Increased HP

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10
Q

First step for starting a gas turbine?

A

Turn on starter engine

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11
Q

Pressure is highest in which part of a gas turbine?

A

Combustor

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12
Q

Steam from superheater goes?

A

HP turbine

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13
Q

What type of governor is on small turbines?

A

Flyball

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14
Q

The governor controls?

A

The amount of steam entering the turbine

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15
Q

How many revolutions for the intake valve to open and close?

A

1/2 turn

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16
Q

Define voltage:

A

Potential difference

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17
Q

What type of anchor is used near the side of the base?

A

Adhesive

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18
Q

Vibration suddenly increases, what could be the reason?

A

Part broken off rotating element

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19
Q

Machine operating near its natural frequency is at what?

A

Critical speed

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20
Q

After welding on a fan, first thing to check?

A

Is it still balanced

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21
Q

After isolating a fan, what should be done next?

A

Block blades to prevent rotation

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22
Q

A known point to base measurements off of?

A

Bench mark

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23
Q

0.5 PSI is how many inches of mercury?

A

1 in/hg

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24
Q

Vacuum is measured in?

A

In/Hg

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25
Q

Machinery requiring a critical alignment should have its base?

A

Levelled lengthways and side ways

26
Q

Multi staging of turbine is?

A

Impulse type

27
Q

Changing out a motor, its isolated and locked out. Whats next?

A

Ensure motor doesnt start

28
Q

Rubber can be used to isolate a machine from what?

A

Vibration

29
Q

Fan output can be controlled by?

A

Inlet dampers

30
Q

Why keep H2O on new concrete?

A

To prevent rapid evaporation

31
Q

Machinery operating in high temps, should use what type of oil?

A

Synthetic

32
Q

Why are boiler tubes rolled and flared?

A

To prevent burning

33
Q

A shaft running through its critical speed would have?

A

A 180 degree phase shift

34
Q

Machinery that is inexpensive is usually run on?

A

Breakdown maintenance requirement

35
Q

What is consistency in concrete?

A

The amount of H2O

36
Q

Static unbalance can easilg be found with?

A

Knife edge

37
Q

ID fans require?

A

External cooled bearings

38
Q

Velocity is a combination of?

A

Speed and direction

39
Q

Most common cause of vibration?

A

Unbalance

40
Q

If adding weights to a rotor is not possible, you can?

A

Remove it from 180 degrees

41
Q

The number of times AC travels back and forth is?

A

Frequency

42
Q

What is a unit of frequency?

A

Cycles per minute

43
Q

What does a condenser do?

A

Increase the pressure drop

44
Q

Phase readings taken on each end of a rotor that has a statuc unbalance would be?

A

Identical

45
Q

To determine a machines vibration is related to unbalance it would be best to analyze the?

A

Amplitude/frequency

46
Q

Which type of balance is hard to correct?

A

Dynamic (most common)

47
Q

When vibration moves in the same direction at the same time, they are said to be?

A

In phase

48
Q

Vibration that is straight with the axis is?

A

Parallel and misaligned

49
Q

Velocity changes rapidly at the upper and lower peaks of displacement is called?

A

Acceleration

50
Q

As a machines speed is doubled, the force is?

A

Quadrupled

51
Q

The amount of time to complete one cycle of vibration is called?

A

Period of vibration

52
Q

Which of the following would indicate a loose component of a piece of machinery?

A

High frequency vibration

53
Q

Which term describes water that is fed into the boiler to replace the water that has been drawn off in the form of steam?

A

Feed water

54
Q

Why are tubes beaded after they are expanded into the tube sheet of an Horizontal Return Tube Boiler?

A

To prevent overheating and burning

55
Q

Which component changes water into steam?

A

Risers

56
Q

Why is a mechanical draft employed on boiler equipment?

A

Overcome furnace resistance

57
Q

draft fan vibration is usually caused by?

A

Soot buildup

58
Q

Where do you take vibe readings for vibe analysis?

A

Horizontal, vertical, axial

59
Q

Tank of oil is found to be out of level, how do you fix?

A

Jack tank up, shim, grout

60
Q

When commissioning a new hydraulic system, what is done first?

A

Back off all relief valve springs and check DCV to ensure correct operation

MB4 (5 decks)

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