FIST 2-1

Question 1

The rotating weight of the unit is transferred through the thrust bearing, through the upper bridge, and through the ___ ____ to the foundation

Answer 1

Stator frame

Question 2

On an umbrella unit, the thrust bearing is located

Answer 2

Below the rotor

Question 3

The three typical types of thrust bearings are

Answer 3

adjustable shoe, self equalizing and spring loaded

Question 4

The adjustable shoe thrust bearing uses a ___ under each of the shoes for adjusting the height and loading of the shoes.

Answer 4

Jack screw

Question 5

To install the thrust block, it is heated to a predetermined temperature and lowered over the shaft, again with the unit on jacks. The block is set on the ____ ____
the rigging removed,
and the radial keys and keeper installed.

Answer 5

Thrust shoes

Question 6

With the thrust block still hot and installed on the shaft, the jacks are released to:

Answer 6

allow the full weight of the unit to set the block in place against the keys

Question 7

Using the thrust bearing high pressure lubrication system, allows for both ___ and ___ movement required during the alignment process.

Answer 7

Rotational; lateral

Question 8

As alignment deviates, loading on the guide bearings will increase as will ___ levels

Answer 8

Vibration

Question 9

Any increase in vibration from misalignment will decrease the ____ factor of operation in severe conditions

Answer 9

Safely

Question 10

The concentricity of the stationary components can be checked by:

Answer 10

hanging a single tight wire to check plumb reference

Question 11

The tolerance for plumb of center of shaft run-out is _____ multiplied by the length of the shaft
from the highest plumb reading to the lowest plumb reading in inches.

Answer 11

0.000025

Question 12

The tolerance for shaft straightness should not be more than _____ inch from a straight line connecting the top and bottom reading point.

Answer 12

0.003

Question 13

The parallel misalignment between two shafts that occurs at the coupling between the generator and turbine shaft is called

Answer 13

Offset

Question 14

Shaft dogleg is

Answer 14

angular misalignment of the turbine and generator shafts

Question 15

Plumb wires should be hung ___ apart.

Answer 15

90°

Question 16

The first preliminary check during the alignment process, is to loosen the mounting bolts on each leg of the upper bridge to check for:

Answer 16

Soft foot

Question 17

One of the most important things to check before taking alignment readings is to make sure the:

Answer 17

Shaft is free

Question 18

The procedure that is particularly useful during major overhauls is to temporarily install the upper and lower bridges and the head cover to check the concentricity of the stationary components with a single plumb wire and a(n):

Answer 18

Electric micrometer

Question 19

When the unit is centered the concentricity can be checked by taking ____ readings at the turbine guide bearings, seal rings, generator air gap, etc.

Answer 19

Clearance

Question 20

Correcting dogleg between the generator and turbine shafts requires installing a shim pack between the:

Answer 20

Coupling faces

Question 21

The second method used for aligning Hydrounits with Adjustable Shoe Thrust Beanngs is using the adjustable feature of the shoes only to achieve equal:

Answer 21

Loaded

Question 22

On Self Equalizing Thrust Bearings, one step in the procedure is to center the shaft in the ____ ____ housing and move the ____ of the shaft to make plumb

Answer 22

turbine bearing; top

Question 23

The final step in the alignment process is the installation and adjustment of the _____ _____

Answer 23

Guide bearings

Question 24

To make the generator guide bearings concentric to the turbine guide bearing, the ____ is used as a reference

Answer 24

Shaft

Question 25

When installing the turbine bearing, several ____ are used to prevent lateral movement

Answer 25

Dowels