Respan Dataset Explorer

What can too much belt tension cause?
Select one:
a. "walking" belt
b. belt to slip excessively
c. premature bearing failure
d. quiet operation

c. premature bearing failure

How do you calculate the proper belt test deflection?
Select one:
a. divide span length by 64
b. divide span length by 46
c. multiply span length by 46
d. multiply span length by 64

a. divide span length by 64

What feature of an adjustable speed sheave changes the driven shaft speed?
Select one:
a. the mounting angle
b. the tension of the set screw
c. the applied torque
d. the adjustable width between the sheave sides

d. the adjustable width between the sheave sides

How do you increase the effective pitch diameter of a sheave?
Select one:
a. decrease the width of the sheave
b. inverse the halves of the sheave
c. increase the diameter of the sheave
d. increase the width of the sheave

c. increase the diameter of the sheave

When adjusting the PD of the drive sheave, what else must be adjusted?
Select one:
a. speed and torque
b. belt tension and speed
c. alignment and torque
d. alignment and belt tension

d. alignment and belt tension

What is mentioned that may cause a positive drive belt to ride to one side of its sheave?
Select one:
a. heavy load
b. wrong sheave size
c. too much tension
d. angular misalignment

d. angular misalignment

Which of the following is not mentioned as an attribute of a positive drive belt?
Select one:
a. easily lubricated
b. quiet
c. no-slip
d. low-friction

a. easily lubricated

What does positive drive rely on to transfer power between pulleys?
Select one:
a. spacing
b. tension
c. fiction
d. geometry

d. geometry

Match the cause of a failure to its effect on the belt.
weathering	Answer 1
belt swells / softens, belt covering splits at seam
frozen or locked shaft on the load	Answer 2
cracking and crazing
excessive exposure to oil and grease	Answer 3
evenly spaced bottom cracks
idler with a diameter that is too small	Answer 4
severe localized wear

Here is the correct matching of the causes of failure to their effects on the belt:

- **Weathering**: Answer 3 (cracking and crazing)
- **Frozen or locked shaft on the load**: Answer 4 (severe localized wear)
- **Excessive exposure to oil and grease**: Answer 1 (belt swells / softens, belt covering splits at seam)
- **Idler with a diameter that is too small**: Answer 2 (evenly spaced bottom cracks) 

So, to summarize:

- Weathering → Cracking and crazing
- Frozen or locked shaft on the load → Severe localized wear
- Excessive exposure to oil and grease → Belt swells / softens, belt covering splits at seam
- Idler with a diameter that is too small → Evenly spaced bottom cracks

Which of the following belt failures is not caused by a sheave that is too small?
Select one:
a. belt slippage
b. split on pitch line
c. evenly spaced bottom cracks
d. ply separation

d. ply separation