INTMECH Machine Design

What should be the diameter (in inches) of a pulley with a belt speed of 4500 fpm and
the motor running at 1760 rpm?

• 9.76

• 10

• 7.76

• 8.76

Determine the length of belt needed for a two flat belt pulleys having a diameter of
70 cm and 30 cm. The center distance is 400 cm and pulleys rotate in the same direction.
Assume power transmitted is 10 hp at 200 rpm.

• 958 cm

• 859 cm

• 589 cm

• 895 cm

The marble tiling machine is designed to be powered by a 150 hp electric motor at a
speed of 1700 rpm, with a standard D-120 V-belts. The pitch diameter of the smaller
sheave is 152 mm and the bigger sheave is 338 mm. Service factor is 1.2. Determine the
angle of contacts if the length of the belt is 3131.82 mm.

• 160.95o; 199.05o

• 170.95o; 189.05o

• 155.95o; 194.05o

• 165.95o; 194.05o

An ammonia compressor is driven by a 20-kW motor. The compressor and the motor rpm
are 360 and 1750, respectively. The small sheave has a pitch diameter of 152.4 mm. If
the belt to be used is standard C-120, determine the center distance between sheaves if
the length of belt is 122.9 in.?

• 709 mm

• 865 mm

• 806 mm

• 686 mm

Find the tooth thickness on the tooth circle of a 20 degree full depth involute tooth
having a circular pitch of 1.25 in. and whole depth of 0.75 inch.

• 10 mm

• 12 mm

• 14 mm

• 16 mm