PHEP 4

Question 1

The revolving runner of a hydraulic turbine is said to have:

Answer 1

Rotating plane motion

Question 2

The balls of the fly ball governor, when the spread of rotation is increasing or decreasing, is said to have:

Answer 2

Spherical motion

Question 3

Critical speed is defined as

Answer 3

A speed that creates a centrifugal force greater than the elastic restoring force of the shaft

Question 4

All of the below statements concerning critical speed are true except

Answer 4

Each shaft will have only one critical speed

Question 5

A mechanism that produces the snapping action when circuit breakers are opened or closed uses the principle of the:

Answer 5

Toggle

Question 6

Which one of the below statements concerning belts and pulleys is not true

Answer 6

The purpose of the idler is to reverse the direction of rotation of a belt drive

Question 7

Select one of the below statements concerning gears that is false

Answer 7

Herringbone gears cause and thrust on the shafts

Question 8

Most flexible couplings:

Answer 8

Require some form of lubrication to reduce friction

Question 9

Hydraulic couplings are generally used with:

Answer 9

Variable speed units

Question 10

Magnetic drives can be used as a:

Answer 10

Clutch, slip coupling, reversible Drive, all three