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BELTS

The document presents a series of problems related to belt drives, including calculations for angle of contact, belt length, pulley speeds, horsepower ratings, and stress limits. Each problem provides multiple-choice answers for users to select from. The scenarios involve various pulley sizes, speeds, and material properties.

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Ej
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115 views2 pages

BELTS

The document presents a series of problems related to belt drives, including calculations for angle of contact, belt length, pulley speeds, horsepower ratings, and stress limits. Each problem provides multiple-choice answers for users to select from. The scenarios involve various pulley sizes, speeds, and material properties.

Uploaded by

Ej
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as DOCX, PDF, TXT or read online on Scribd
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BELTS

1. Find the angle of contact on the small pulley for an open belt drive with a 72 in center distance. The
pulley diameters are 6 in and 12 in.
A. 175.22°
B. 170.34°
C. 185. 34°
D. 165.34°

2. Find the belt length at a 72 in distance connected in open belt. The pulley diameters are 6 and 12 in.
A. 162.34 in
B. 173.45 in
C. 123.55 in
D. 172.39 in
3. A 6 in diameter pulley turning at 600 rpm is belt connected to ma 12 in diameter pulley. If there is
4% slip, find the speed of the 12 in pulley.
A. 187 rpm
B. 223 rpm
C. 203 rpm
D. 288 rpm

4. For a given belt a manufacturer gives a horsepower rating of 2.5 hp per inch of width based on a belt
speed of 2600 ft/min. The drive is to handle 10 hp and the arc of contact correction factor is 0.90.
Find the width of belt needed. Assume that the belt widths are available in 1 inch increments.
A. 3 in
B. 5 in
C. 4 in
D. 6 in

5. A ¼ in round endless belt connects a 1 in diameter pulley with a 2 in pulley; spacing between
pulleys is 4 in on centers. The allowable stress is 400 psi. If the 1 in pulley is the driver and rotates
100 rpm. How much horsepower can be transmitted? Assume the coefficient of friction to be 0.30
for each pulley.
A. 0.123 hp
B. 1.234 hp
C. 0.0115 hp
D. 0.0090 hp

6. A 3/8 in flat leather belt is 12 in wide and is used on a 24 in diameter pulley rotating 600 rpm. The
specific weight of the belt is 0.035 lb/in3. The angle of contact is 150°. If the coefficient of friction is
0.3 and the allowable stress is 300 psi how much hp can it transmit?
A. 34.5 hp
B. 69.5 hp
C. 78.5 hp
D. 54.5 hp

7. A 5 mm round belt connects a 20 mm pulley with a 40 mm pulley. The center distance is 150 mm.
The 20 mm pulley rotates at 100 rpm and the coefficient of friction of the belt is 0.25. Find the
horsepower capacity for this arrangement if the allowable belt stress is 2.6 N/mm2.
A. 0.12 kw
B. 0.23 kw
C. 0.00282 kw
D. 0.054 kw

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