Review

Question 1

Characteristics of a 3 phase motor?

Answer 1

Easily reversed

Question 2

Accuracy of a precision level?

Answer 2

.005”

Question 3

Accuracy of an optical precision level?

Answer 3

.001”

Question 4

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

Answer 4

Quasi-static

Question 5

Displacement is measured in?

Answer 5

Mils

Question 6

What opens an intake valve?

Answer 6

Cam lobe, or Vacuum of piston?

Question 7

Diesel engine smoking black, what should be checked first?

Answer 7

Air filter

Question 8

Order of stroke in 4 stroke engines

Answer 8

ICPE, intake-compression-power-exhaust

Question 9

Purpose of a turbo charger?

Answer 9

Increased HP

Question 10

First step for starting a gas turbine?

Answer 10

Turn on starter engine

Question 11

Pressure is highest in which part of a gas turbine?

Answer 11

Combustor

Question 12

Steam from superheater goes?

Answer 12

HP turbine

Question 13

What type of governor is on small turbines?

Answer 13

Flyball

Question 14

The governor controls?

Answer 14

The amount of steam entering the turbine

Question 15

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

Answer 15

1/2 turn

Question 16

Define voltage:

Answer 16

Potential difference

Question 17

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

Answer 17

Adhesive

Question 18

Vibration suddenly increases, what could be the reason?

Answer 18

Part broken off rotating element

Question 19

Machine operating near its natural frequency is at what?

Answer 19

Critical speed

Question 20

After welding on a fan, first thing to check?

Answer 20

Is it still balanced

Question 21

After isolating a fan, what should be done next?

Answer 21

Block blades to prevent rotation

Question 22

A known point to base measurements off of?

Answer 22

Bench mark

Question 23

0.5 PSI is how many inches of mercury?

Answer 23

1 in/hg

Question 24

Vacuum is measured in?

Answer 24

In/Hg

Question 25

Machinery requiring a critical alignment should have its base?

Answer 25

Levelled lengthways and side ways

Question 26

Multi staging of turbine is?

Answer 26

Impulse type

Question 27

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

Answer 27

Ensure motor doesnt start

Question 28

Rubber can be used to isolate a machine from what?

Answer 28

Vibration

Question 29

Fan output can be controlled by?

Answer 29

Inlet dampers

Question 30

Why keep H2O on new concrete?

Answer 30

To prevent rapid evaporation

Question 31

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

Answer 31

Synthetic

Question 32

Why are boiler tubes rolled and flared?

Answer 32

To prevent burning

Question 33

A shaft running through its critical speed would have?

Answer 33

A 180 degree phase shift

Question 34

Machinery that is inexpensive is usually run on?

Answer 34

Breakdown maintenance requirement

Question 35

What is consistency in concrete?

Answer 35

The amount of H2O

Question 36

Static unbalance can easilg be found with?

Answer 36

Knife edge

Question 37

ID fans require?

Answer 37

External cooled bearings

Question 38

Velocity is a combination of?

Answer 38

Speed and direction

Question 39

Most common cause of vibration?

Answer 39

Unbalance

Question 40

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

Answer 40

Remove it from 180 degrees

Question 41

The number of times AC travels back and forth is?

Answer 41

Frequency

Question 42

What is a unit of frequency?

Answer 42

Cycles per minute

Question 43

What does a condenser do?

Answer 43

Increase the pressure drop

Question 44

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

Answer 44

Identical

Question 45

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

Answer 45

Amplitude/frequency

Question 46

Which type of balance is hard to correct?

Answer 46

Dynamic (most common)

Question 47

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

Answer 47

In phase

Question 48

Vibration that is straight with the axis is?

Answer 48

Parallel and misaligned

Question 49

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

Answer 49

Acceleration

Question 50

As a machines speed is doubled, the force is?

Answer 50

Quadrupled

Question 51

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

Answer 51

Period of vibration

Question 52

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

Answer 52

High frequency vibration

Question 53

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

Answer 53

Feed water

Question 54

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

Answer 54

To prevent overheating and burning

Question 55

Which component changes water into steam?

Answer 55

Risers

Question 56

Why is a mechanical draft employed on boiler equipment?

Answer 56

Overcome furnace resistance

Question 57

draft fan vibration is usually caused by?

Answer 57

Soot buildup

Question 58

Where do you take vibe readings for vibe analysis?

Answer 58

Horizontal, vertical, axial

Question 59

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

Answer 59

Jack tank up, shim, grout

Question 60

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

Answer 60

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