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Mechanical Engineering - Machine Design - Discussion

Discussion Forum : Machine Design - Section 8 (Q.No. 41)
Machine Design
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.
Discussion:
10 comments Page 1 of 1.
Ajaypal said:   9 years ago
Why not C?
RAJA said:   9 years ago
Yes, option C is also the correct answer.
Milindsardar said:   9 years ago
All the given options are correct.
Hitesh Daka said:   9 years ago
Yes, all are correct. I agree with you all.
Md Rajaul Hak said:   8 years ago
Why option"c" is not correct?
TNK said:   7 years ago
Yes, All the given options are correct.
Rajkotha said:   6 years ago
Helix angle < friction angle -self locking screw <50%.

Heix angle >friction angle -overhauling screw>50%.
BISWAJIT said:   6 years ago
Why not option C?
Vinay BEL said:   5 years ago
Yes, I too agree, All the given options are correct.
Vijay patel said:   5 years ago
I think it can be more than 50 per cent but in this question, it is written" will be" that's why it is wrong. So in place of will be, it should be can be. Then C will be right.
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