Question (1) A power screw has single square threads. It has a major diameter of 36 mm and a pitch of 6 mm. The coefficient of friction for the threads is 0.13 and that for the collar is 0.1 which has an effective diameter of 90 mm. This power screw is required to raise a load of 70 kN at a screw noond Circle the correct answer in the following:

International Edition---engineering Mechanics: Statics, 4th Edition
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ISBN:9781305501607
Author:Andrew Pytel And Jaan Kiusalaas
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Chapter7: Dry Friction
Section: Chapter Questions
Problem 7.57P: The square-threaded screw with a pitch of 10 mm and a mean radius of 18 mm drives a gear that has a...
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Question (1)
power screw has single square threads. It has a major diameter of 36 mm and a pitch of 6 mm.
The coefficient of friction for the threads is 0.13 and that for the collar is 0.1 which has an
effective diameter of 90 mm. This power screw is required to raise a load of 70 kN at a screw
rotational speed of 2 revolutions per second. Circle the correct answer in the following:
A
Transcribed Image Text:Question (1) power screw has single square threads. It has a major diameter of 36 mm and a pitch of 6 mm. The coefficient of friction for the threads is 0.13 and that for the collar is 0.1 which has an effective diameter of 90 mm. This power screw is required to raise a load of 70 kN at a screw rotational speed of 2 revolutions per second. Circle the correct answer in the following: A
b) The lead for the screw is:
(а) 6 mm
c) The root (minor) diameter is:
(а) 36 mm
(b) 12 mm
(c) 3 mm
(d) 1.5 mm
(b) 30 mm
(c) 33 mm
(d) 34.5 mm
d) The torque required to raise the load is:
(a) 533.6 N.m (b) 553.5 N.m (c) 218.64 N.m
e) The power required to raise the load is:
(a) 6.95 kW (b) 6.7 kW
(d) 315 N.m
(c) 2.75 kW
(d) 3.95 kW
h land hy 1 m?:
Transcribed Image Text:b) The lead for the screw is: (а) 6 mm c) The root (minor) diameter is: (а) 36 mm (b) 12 mm (c) 3 mm (d) 1.5 mm (b) 30 mm (c) 33 mm (d) 34.5 mm d) The torque required to raise the load is: (a) 533.6 N.m (b) 553.5 N.m (c) 218.64 N.m e) The power required to raise the load is: (a) 6.95 kW (b) 6.7 kW (d) 315 N.m (c) 2.75 kW (d) 3.95 kW h land hy 1 m?:
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