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Mechanical Engineering - Machine Design

Exercise : Machine Design - Section 8
41.
Which of the following statement is correct regarding power screws?
The efficiency of a self locking screw can not be more than 50%
The efficiency of Acme (trapezoidal) thread is less than that of a square thread
If the friction angle is less than the helix angle of the screw, then the efficiency will be more than 50%
(A) and (B) Only
Answer: Option
Explanation:
No answer description is available. Let's discuss.
42.
A hollow shaft will transmit a __________ torque than a solid shaft of the same mass and same material.
smaller
greater
Answer: Option
Explanation:
No answer description is available. Let's discuss.
43.
A flange coupling is used to connect two shafts
which are perfectly aligned
which are not in exact alignment
have lateral misalignment
whose axes intersect at a small angle
Answer: Option
Explanation:
No answer description is available. Let's discuss.
44.
The algebraic difference between the maximum limit and the basic size is called
lower deviation
upper deviation
actual deviation
mean deviation
Answer: Option
Explanation:
No answer description is available. Let's discuss.
45.
When an open coiled helical compression spring is subjected to an axial compressive load, the stress induced in the wire is
tensile stress
compressive stress
shear stress
bending stress
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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