Design of Machine Elements solved MCQs With Answers

6. In manual assembly, cost of screw is higher than the cost of driving a screw.

A. true

B. false

explanation:-generally manufacturing screw is cheaper than driving it.

7. Maximum carbon content in welding is usually limited to

A. 0.22%

B. 0.8%

C. 1.5%

D. 2%

A. 0.22%

explanation:-with increase of carbon, welding becomes difficult as weld becomes susceptible to cracks.

8. Why tolerances are given to the parts?

A. because it’s impossible to make perfect settings

B. to reduce weight of the component

C. to reduce cost of the assembly

D. to reduce amount of material used

A. because it’s impossible to make perfect settings

explanation:-tolerances are provided to the parts because variations in the material properties introduce errors and production machines themselves have inherent inaccuracies. another reason to introduce tolerance is that it is not possible to make perfect settings by operator so some tolerances are provided.

9. What is bilateral tolerance?

A. total tolerance is in 1 direction only

B. total tolerance is in both the directions

C. may or may not be in one direction

D. tolerance provided all over the component body

B. total tolerance is in both the directions

explanation:-total tolerance is specified on both the sides of the basic dimension. this usually have + and – tolerance of equal amount.

10. What is mean clearance?

A. maximum size of hole minus maximum size of shaft

B. minimum size of hole minus minimum size of shaft

C. mean size of hole minus mean size of shaft

D. average of both size of shaft and hole

C. mean size of hole minus mean size of shaft

explanation:-statistical approach allows wider tolerances compared to complete interchangeability approach. methods used by statistical approach are usually permits cheaper production. mean clearance is equal to (mean size of hole – mean size of shaft).

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