Machine Design MCQ Questions & Answers

The modulus of elasticity for mild steel is approximately equal to

A) 80 kN/mm² B) 100 kN/mm² C) 110 kN/mm² D) 210 kN/mm²

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Answer & Solution

Answer: Option D

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Two helical springs of the same material and of equal circular cross-section, length and number of turns, but having radii 80 mm and 40 mm, kept concentrically (smaller radius spring within the larger radius spring), are compressed between two parallel planes with a load W. The inner spring will carry a load equal to

A) $$\frac{{\text{W}}}{2}$$ B) $$\frac{{2{\text{W}}}}{3}$$ C) $$\frac{{\text{W}}}{9}$$ D) $$\frac{{8{\text{W}}}}{9}$$

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Answer: Option B

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The shock absorbing capacity of a bolt may be increased by

A) Increasing its shank diameter B) Decreasing its shank diameter C) Tightening the bolt properly D) Making the shank diameter equal to core diameter of thread

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Answer: Option B

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The resilience of a bolt may be increased by

A) Increasing its shank diameter B) Increasing its length C) Decreasing its shank diameter D) Decreasing its length

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Answer: Option B

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When a metal or alloy is cold worked,

A) Its hardness and strength increases B) It is worked below recrystallization temperature C) Both (A) and (B) D) None of these

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Answer: Option C

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Machine Design MCQ Questions & Answers | Mechanical Engineering