Machine Design MCQ Questions & Answers

71

When an open coiled helical compression spring is subjected to an axial load (W), the compression produced in the spring will be (where, n = No. of active turns of the spring and G = Modulus of rigidity for the spring material)

A) $$\frac{{2{\text{W}}{{\text{D}}^3}{\text{n}}}}{{{\text{G}}{{\text{d}}^4}}}$$ B) $$\frac{{4{\text{W}}{{\text{D}}^3}{\text{n}}}}{{{\text{G}}{{\text{d}}^4}}}$$ C) $$\frac{{8{\text{W}}{{\text{D}}^3}{\text{n}}}}{{{\text{G}}{{\text{d}}^4}}}$$ D) $$\frac{{16{\text{W}}{{\text{D}}^3}{\text{n}}}}{{{\text{G}}{{\text{d}}^4}}}$$

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Answer & Solution

Answer: Option C

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72

A leaf spring in automobiles is used

A) To apply forces B) To measure forces C) To absorb shocks D) To store strain energy

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Answer: Option C

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73

The fatigue stress concentration factor is defined as

A) The ratio of endurance limit with stress concentration to the endurance limit without stress concentration B) The ratio of endurance limit without stress concentration to the endurance limit with stress concentration C) The product of the endurance limits with and without stress concentration D) All of the above

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Answer: Option B

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74

If b denotes the face width and L denotes the cone distance for a bevel gear, then the bevel factor is written as

A) $$\frac{{\text{b}}}{{\text{L}}}$$ B) $$\frac{{\text{b}}}{{2{\text{L}}}}$$ C) $$1 - 2{\text{bL}}$$ D) $$1 - \frac{{\text{b}}}{{\text{L}}}$$

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Answer: Option D

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75

The ratio of the ultimate stress to the design stress is known as

A) Elastic limit B) Strain C) Factor of safety D) Bulk modulus

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Answer: Option C

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76

If P₁ and P₂ are the tight and slack side tensions in the belt, then the initial tension P_i (according to Barth) will be equal to (Where, P_c is centrifugal tension)

A) $${\left( {\frac{{\sqrt {{{\text{P}}_1}} + \sqrt {{{\text{P}}_2}} }}{2}} \right)^2}$$ B) $${{\text{P}}_1} + {{\text{P}}_2}$$ C) $$\frac{1}{2}\left( {{{\text{P}}_1} + {{\text{P}}_2}} \right)$$ D) $$\frac{1}{2}\left( {{{\text{P}}_1} + {{\text{P}}_2}} \right) + {{\text{P}}_{\text{c}}}$$

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Answer & Solution

Answer: Option A

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77

If P₁ and P₂ are the tight and slack side tensions in the belt, then the initial tension P_i (neglecting centrifugal tension) will be equal to (Where, P_c is centrifugal tension)

A) $${{\text{P}}_1} - {{\text{P}}_2}$$ B) $${{\text{P}}_1} + {{\text{P}}_2}$$ C) $$\frac{1}{2}\left( {{{\text{P}}_1} + {{\text{P}}_2}} \right)$$ D) $$\frac{1}{2}\left( {{{\text{P}}_1} + {{\text{P}}_2}} \right) + {{\text{P}}_{\text{c}}}$$

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Answer: Option C

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78

Turn buckle has

A) Right hand threads on bout ends B) Left hand threads on both ends C) Left hand threads on one end and right hand threads on other end D) No threads

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Answer & Solution

Answer: Option C

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79

The angle of twist of shaft is

A) Directly proportional to (shaft diameter)² B) Inversely proportional to (shaft diameter)² C) Directly proportional to (shaft diameter)⁴ D) Inversely proportional to (shaft diameter)⁴

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Answer: Option D

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80

Guest's theory of failure is applicable for following type of materials

A) Brittle B) Ductile C) Elastic D) Plastic

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Answer & Solution

Answer: Option B

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Machine Design MCQ Questions & Answers | Mechanical Engineering