Theory Of Machine MCQ Questions & Answers

31

In a vibrating system, if the actual damping coefficient is 40 N/m/s and critical damping coefficient is 420 N/m/s, then logarithmic decrement is equal to

A) 0.2 B) 0.4 C) 0.6 D) 0.8

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Answer & Solution

Answer: Option C

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32

In under damped vibrating system, if $${{x_1}}$$ and $${{x_2}}$$ are the successive values of the amplitude on the same side of the mean position, then the logarithmic decrement is equal to

A) $$\frac{{{x_1}}}{{{x_2}}}$$ B) $$\log \frac{{{x_1}}}{{{x_2}}}$$ C) $$\log e\frac{{{x_1}}}{{{x_2}}}$$ D) $$\log \left( {{x_1} \times {x_2}} \right)$$

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Answer & Solution

Answer: Option B

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33

The two parallel and coplanar shafts are connected by gears having teeth parallel to the axis of the shaft. This arrangement is known as

A) Spur gearing B) Helical gearing C) Bevel gearing D) Spiral gearing

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Answer & Solution

Answer: Option A

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34

The type of pair formed by two elements which are so connected that one is constrained to turn or revolve about a fixed axis of another element is known as

A) Turning pair B) Rolling pair C) Sliding pair D) Spherical pair

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Answer & Solution

Answer: Option A

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35

The velocity of any point in mechanism relative to any other point on the mechanism on velocity polygon is represented by the line

A) Joining the corresponding points B) Perpendicular to line as per (A) C) Not possible to determine with these data D) At 45° to line as per (A)

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Answer & Solution

Answer: Option A

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36

Which of the following property of the instantaneous center is correct?

A) A rigid link rotates instantaneously relative to another link at the instantaneous centre for the configuration of the mechanism considered. B) The two rigid links have no linear velocity relative to each other at the instantaneous centre. C) The velocity of the instantaneous centre relative to any third rigid link is same whether the instantaneous centre is regarded as a point on the first rigid link or on the second rigid link. D) All of the above

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Answer & Solution

Answer: Option D

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37

The periodic time of a compound pendulum is __________ when the distance between the point of suspension and the center of gravity is equal to the radius of gyration of the body about its center of gravity.

A) Zero B) Minimum C) Maximum D) None of these

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Answer & Solution

Answer: Option B

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38

The pair is known as a higher pair, when the relative motion between the elements of a pair is

A) Turning only B) Sliding only C) Rolling only D) Partly turning and partly sliding

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Answer & Solution

Answer: Option D

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39

In order to give a complete secondary balance of a multi-cylinder inline engine,

A) The algebraic sum of the secondary forces must be equal to zero B) The algebraic sum of the couples about any point in the plane of the secondary forces must be equal to zero C) Both (A) and (B) D) None of these

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Answer & Solution

Answer: Option C

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40

In order to give the primary balance of the reciprocating parts of a multi-cylinder inline engines

A) The algebraic sum of the primary forces must be equal to zero B) The algebraic sum of the couples about any point in the plane of the primary forces must be equal to zero C) Both (A) and (B) D) None of these

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Answer & Solution

Answer: Option C

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Theory Of Machine MCQ Questions & Answers | Mechanical Engineering