Machine Design MCQ Questions & Answers

21

The velocity factor for ordinary cut gears operating at velocities up to 12.5 m/s is equal to

A) $$\frac{{0.75}}{{0.75 + \sqrt {\text{v}} }}$$ B) $$\frac{3}{{3 + {\text{v}}}}$$ C) $$\frac{{4.5}}{{4.5 + {\text{v}}}}$$ D) $$\frac{6}{{6 + {\text{v}}}}$$

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Answer & Solution

Answer: Option B

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22

According to Indian standard specifications, plain carbon steel designated by 40 C8 contains carbon

A) 0.20 to 0.40% B) 0.35 to 0.45% C) 0.40 to 0.60% D) None of these

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Answer & Solution

Answer: Option B

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23

A bolt

A) Has a head on one end and a nut fitted to the other B) Has head at one end and other end fits into a tapped hole in the other part to be joined C) Has both the ends threaded D) Is provided with pointed threads

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Answer & Solution

Answer: Option A

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24

The resultant axial load on a bolt depends on

A) Initial tension B) External load applied C) Relative elastic yielding (springness) of the bolt and the connected member D) All of the above

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Answer & Solution

Answer: Option D

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25

Which of the following formula is used in designing a connecting rod?

A) Euler's formula B) Rankine's formula C) Johnson's straight line formula D) Johnson's parabolic formula

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Answer & Solution

Answer: Option B

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26

Which of the following statement is wrong for a connecting rod?

A) The connecting rod will be equally strong in buckling about X-axis and Y-axis, if $${l_{{\text{xx}}}} = 4{l_{{\text{yy}}}}$$ B) If $${l_{{\text{xx}}}} > 4{l_{{\text{yy}}}},$$ the buckling will occur about Y-axis C) If $${l_{{\text{xx}}}} < 4{l_{{\text{yy}}}},$$ the buckling will occur about X-axis D) The most suitable section for the connecting rod is T-section

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Answer & Solution

Answer: Option D

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27

Which of the following cotter joint will be used to connect strap end of a connecting rod?

A) Spigot and socket cotter joint B) Sleeve and cotter joint C) Gib and cotter joint D) Any one of these

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Answer & Solution

Answer: Option C

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28

A key way lowers

A) The strength of the shaft B) The rigidity of the shaft C) Both the strength and rigidity of the shaft D) The ductility of the shaft

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Answer & Solution

Answer: Option C

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29

Which one of the following is a positive drive?

A) V-belt drive B) Rope drive C) Crossed flat belt drive D) Chain drive

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Answer & Solution

Answer: Option D

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30

A stud

A) Has a head on one end and a nut fitted to the other B) Has head at one end and other end fits into a tapped hole in the other part to be joined C) Has both the ends threaded D) Has pointed threads

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Answer & Solution

Answer: Option C

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Machine Design MCQ Questions & Answers | Mechanical Engineering