Power Transmission

Question 1

Calculate the accurate belt length for the following: Large diameter pulley is 11.25” and the small diameter pulley is 6.125”. Shaft centers are 17.5” apart.

Answer 1

(11.25 +6.125)/2 x π + (2x 17.5)
= 62.29

Question 2

The clearance of meshing gears of any diametral pitch is known as:

Answer 2

Backlash

Question 3

A Babbitt bearing percentage refers to its area of contact. This is found by:

Answer 3

Bluing

Question 4

A bearing with a “K” it denotes a tapered bearing. This is held in place by

Answer 4

A tapered adapter sleeve

Question 5

An 8” pulley turns at 120 RPM and drives a second pulley at 150 RPM. What is the driven pulley
diameter?

Answer 5

6.4

Question 6

The letters A, B, C on a sprocket refers to:

Answer 6

Hub Class

Question 7

Crowning on a pulley is used for:

Answer 7

Self alignment

Question 8

The standard taper on an imperial key is:

Answer 8

1:96

Question 9

A type of bearing mounted face to face and back-to-back is:

Answer 9

angular contact

Question 10

A bearing with a code of SKF 6212 has a bore of:

Answer 10

60 mm

Question 11

A belt is wrapped around a 6.25” pulley and has 220 degrees of contact. How much of the beltis contacting the pulley? (Use 3.14159 for pi)

Answer 11

11.999”

Question 12

A #60 chain has a pitch of

Answer 12

3/4”

Question 13

In a number 65 chain, the 5 refers to:

Answer 13

That the chain is rollerless

Question 14

A drive system has two pulleys. The drive pulley is rotating at 120RPM, and the driven at 150 RPM. The driven pulley is 6.4” in diameter. What is the diameter of the drive pulley?

Answer 14

8”

Question 15

Roller thrust anti friction bearings carry what type of load?

Answer 15

Axial

Question 16

What do you use to check the clearance of a spherical roller bearing?

Answer 16

Feeler gauge

Question 17

What type of coupling connects two shafts at slight angles?

Answer 17

U-Joint

Question 18

What temperature (in Fahrenheit) is a bearing to be heated to in an oil bath, prior to installation?

Answer 18

248 to 250

Question 19

What temperature (in Fahrenheit) is Babbitt poured at?

Answer 19

650 to 700

Question 20

What is the best method of belt joining?

Answer 20

Vulcanizing

Question 21

What is “creep” in a belt caused by?

Answer 21

elasticity

Question 22

What is “creep” in a bearing?

Answer 22

The very slow rotation of the outer race

Question 23

What principal do timing gears use?

Answer 23

Gear tooth

Question 24

A gear tooth with a larger pressure angle is said to be:

Answer 24

Stronger

Question 25

What are gib joint bearings suited for?

Answer 25

Limited side loading

Question 26

High-speed bearings and roller chain use what type of lubrication?

Answer 26

Mist

Question 27

How much oil is required to lubricate a ball bearing?

Answer 27

Enough to cover halfway up the bottom rolling element

Question 28

What is the breaker ply of a belt?

Answer 28

Layer under the carcass to absorb shock

Question 29

What do you use to carry “fines” on a conveyor?

Answer 29

Camber slide