Design Engineer Question:
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When screw threads are to be used in a situation where power is being transmitted in one direction only, then the screw threads suitable for this will be

A. square threads
B. acme threads
C. knuckle threads
D. buttress threads

Answer:

Option D

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A sliding bearing which operates without any lubricant present, is called

A. zero film bearing
B. boundary lubricated bearing
C. hydrodynamic lubricated bearing
D. hydrostatic lubricated bearing		A screw is said to be over hauling screw, if its efficiency is

A. less than 50%
B. more than 50%
C. equal to 50%
D. none of these