PHEP 3

Question 1

A machine is a device for converting force to useful work. It can be used to?

Answer 1

Change the size of a force, change the direction of the force, change the speed or rate of forces acting (all the above)

Question 2

Of the below statements concerning machine efficiency, which one is not a true statement?

Answer 2

Transformers are less efficient than reciprocating pumps

Question 3

A shaft or journal revolving in and oil lubricated bearing is usually identified with

Answer 3

Fluid friction

Question 4

A bearing that supports or restricts the longitudinal motion of a rotating shaft is called a

Answer 4

Thrust bearing

Question 5

All of the below factors have an effect on the formation of the desired oil wedge. Which one must operators give the most careful attention to preventing bearing damage

Answer 5

Shaft or journal speed

Question 6

Lubricating oil is normally fed into a horizontal journal bearing from where

Answer 6

 top

Question 7

Journal and thrust bearings are more susceptible to damage during

Answer 7

Both start up and shut down operations

Question 8

Well bearing clearances were very somewhat because of different design and loading characteristics, it is generally establish that for each inch of shaft diameter clearance should be about

Answer 8

.001”

Question 9

All the below statements relating to bearing load are true except

Answer 9

Heavy loaded bearings generally require an oil low and viscosity

Question 10

All of the below statements concerning all grooves and bearings are true except

Answer 10

The oil groove is generally located in the high-pressure area of the bearing

Question 11

An increase in bearing temperature may indicate

Answer 11

Dirty oil, insufficient oil, change in surrounding air temperature (all above)

Question 12

Anti-friction or roller bearings are made to carry

Answer 12

Radial loads, thrust loads, angular loads (all above)

Question 13

Ball bearing life may be shortened by

Answer 13

Improper installation, over or under lubrication, entrance of abrasive material into moving parts (all above)

Question 14

If the oil reservoir in a ring oiled bearing is carried to high the ring:

Answer 14

Will turn more slowly due to increase friction in turning through the oil

Question 15

The desired oil wedge is formed in a Kingsbury thrust bearing by

Answer 15

The pivoted shoes or blocks

Question 16

The below statements concerning a Kingsbury spherical thrust bearing are all true except

Answer 16

It combines the functions of a lower generator guide and thrust bearing

Question 17

Which of the following statements concerning vertical turbine guide bearings is true

Answer 17

The lignum-vitae strips are inserted in the bearing shell

Question 18

Which of the below features is not normally found on a horizontal turbine thrust bearing installation

Answer 18

Provisions for pressurized lubrication

Question 19

Which of the below features is not normally found on a horizontal turbine journal bearing installation

Answer 19

Bearing contained in a Reservoir or tub

Question 20

Which of the below features is not normally found on a Gibbs horizontal turbine shaft thrust and journal bearing

Answer 20

Pivoted blocks or shoes