Machine Design MCQ Questions & Answers

61

Lewis form factor for $$14{\frac{1}{2}^ \circ }$$ composite and full depth involute system is (where T = Number of teeth)

A) $$0.124 - \frac{{0.684}}{{\text{T}}}$$ B) $$0.154 - \frac{{0.912}}{{\text{T}}}$$ C) $$0.175 - \frac{{0.841}}{{\text{T}}}$$ D) None of these

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Answer & Solution

Answer: Option A

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62

The speed of the sprocket reduces as the chain pitch __________ for a given number of teeth.

A) Increases B) Decreases C) Remain same D) None of these

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Answer & Solution

Answer: Option A

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63

A shaft is subjected to a maximum bending stress of 80 N/mm² and maximum shearing stress equal to 30 N/mm² at a particular section. If the yield point in tension of the material is 280 N/mm² and the maximum shear stress theory of failure is used, then the factor of safety obtained will be

A) 2.5 B) 2.8 C) 3.0 D) 3.5

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Answer & Solution

Answer: Option B

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64

The stiffness of a closely coiled helical spring subjected to an axial load W is equal to (where G = Modulus of rigidity and n = Number of active coils)

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

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Answer & Solution

Answer: Option A

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65

For longitudinal joint in boilers, the type of joint used is

A) Butt joint with single cover plate B) Butt joint with double cover plate C) Lap joint with one ring overlapping the other D) Any one of the above

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Answer & Solution

Answer: Option B

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66

For circumferential joint in boilers, the type of joint used is

A) Butt joint with single cover plate B) Butt joint with double cover plate C) Lap joint with one ring overlapping the other D) Any one of the above

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Answer & Solution

Answer: Option C

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67

A column of length $$l$$ is fixed at both ends. The equivalent length of the column is

A) $$\frac{l}{2}$$ B) $$\frac{l}{{\sqrt 2 }}$$ C) $$l$$ D) $$2l$$

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Answer & Solution

Answer: Option A

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68

The cracks in helical springs used in railway carriages usually start on the inner side of the coil because of the fact that

A) It is subjected to a higher cyclic loading than the outer side B) It is subjected to a higher stress than the outer side C) It is more stretched than the outer side during the manufacturing process D) It has a lower curvature than the outer side

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Answer & Solution

Answer: Option A

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69

Soderberg relation is based on __________ of the material whereas all other failure relation for dynamic loading are based on ultimate strength of the material.

A) Elastic strength B) Yield strength C) Shear strength D) None of these

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Answer & Solution

Answer: Option B

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70

When a closely coiled helical spring is subjected to a couple about its axis, the stress induced in the wire material of the spring is

A) Bending stress only B) A combination of torsional shear stress and bending C) Direct shear stress only D) A combination of bending stress and direct shear stress

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Answer & Solution

Answer: Option A

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Machine Design MCQ Questions & Answers | Mechanical Engineering