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Dear candidates you will find MCQ questions of Design of Machine Elements here. Learn these questions and prepare yourself for coming examinations and interviews. You can check the right answer of any question by clicking on any option or by clicking view answer button.

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Q. 1) Stressed parts are always kept in tension.

(A) true

(B) false

(D) ---

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Correct answer:
Option (A) - true

Explanation:

 cast iron has more compressive strength.

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Q. 2) Which process allows controlling grain structure of the product?

(A) casting

(B) forging

(D) die casting

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Correct answer:
Option (B) - forging

Explanation:

 in casting metal is in fluid state and hence impossible to control the grain structure.

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Q. 3) Cast surfaces have good finishing.

(A) true

(B) false

(D) ---

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Correct answer:
Option (B) - false

Explanation:

 cavity is surrounded by sand and hence not good finish is obtained.

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Q. 4) In forging, metal is in which of the following stage?

(A) elastic

(B) plastic

(D) rigid

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Correct answer:
Option (B) - plastic

Explanation:

 forging is the working of metal in plastic range.

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Coach

Q. 5) Among casting, forging and forging which has the slowest rate of production?

(A) casting

(B) forging

(D) all have equal rate of production

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Correct answer:
Option (C) - machining

Explanation:

 machining each part is very time consuming.

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Coach

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

(A) true

(B) false

(D) ---

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Correct answer:
Option (B) - false

Explanation:

 generally manufacturing screw is cheaper than driving it.

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Coach

Q. 7) Maximum carbon content in welding is usually limited to

(A) 0.22%

(B) 0.8%

(D) 2%

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Correct answer:
Option (A) - 0.22%

Explanation:

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

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Q. 8) Why tolerances are given to the parts?

(A) because it’s impossible to make perfect settings

(B) to reduce weight of the component

(D) to reduce amount of material used

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Correct answer:
Option (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.

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Q. 9) What is bilateral tolerance?

(A) total tolerance is in 1 direction only

(B) total tolerance is in both the directions

(D) tolerance provided all over the component body

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Correct answer:
Option (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.

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Q. 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

(D) average of both size of shaft and hole

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Correct answer:
Option (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).