Theory Of Machine MCQ Questions & Answers

61

A disturbing mass m₁ attached to the rotating shaft may be balanced by a single mass m₂ attached in the same plane of rotation as that of m₁, such that (where r₁ and r₂ are the radii of rotation of m₁ and m₂ respectively)

A) m₁r₂ = m₂r₁ B) m₁r₁ = m₂r₂ C) m₁m₂ = r₁r₂ D) None of these

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Answer & Solution

Answer: Option B

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62

The maximum fluctuation of energy is the

A) Difference between the maximum and minimum energies B) Sum of the maximum and minimum energies C) Variations of energy above and below the mean resisting torque line D) Ratio of the mean resisting torque to the work-done per cycle

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Answer: Option A

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63

The Kutzbach criterion for determining the number of degrees of freedom (n) is (where $$l$$ = number of links, j = number of joints and h = number of higher pairs)

A) n = 3($$l$$ - 1) - 2j - h B) n = 2($$l$$ - 1) - 2j - h C) n = 3($$l$$ - 1) - 3j - h D) n = 2($$l$$ - 1) - 3j - h

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Answer & Solution

Answer: Option A

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64

The example of lower pair is

A) Shaft revolving in a bearing B) Straight line motion mechanisms C) Automobile steering gear D) All of the above

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Answer & Solution

Answer: Option D

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65

Which of the following is an example of sliding pair?

A) Piston and cylinder of a reciprocating steam engine B) Shaft with collars at both ends fitted into a circular hole C) Lead screw of a lathe with nut D) Ball and a socket joint

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Answer & Solution

Answer: Option A

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66

The two links OA and OB are connected by a pin joint at O. If the link OA turns with angular velocity $${\omega _1}$$ rad/s in the clockwise direction and the link OB turns with angular velocity $${\omega _2}$$ rad/s in the anticlockwise direction, then the rubbing velocity at the pin joint O is (where r = Radius of the pin at O)

A) $${\omega _1}{\omega _2}{\text{r}}$$ B) $$\left( {{\omega _1} - {\omega _2}} \right){\text{r}}$$ C) $$\left( {{\omega _1} + {\omega _2}} \right){\text{r}}$$ D) $$\left( {{\omega _1} - {\omega _2}} \right)2{\text{r}}$$

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Answer & Solution

Answer: Option C

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67

The two links OA and OB are connected by a pin joint at O. If the link OA turns with angular velocity $${\omega _1}$$ rad/s in the clockwise direction and the link OB turns with angular velocity $${\omega _2}$$ rad/s in the clockwise direction, then the rubbing velocity at the pin joint O is (where r = Radius of the pin at O)

A) $${\omega _1}{\omega _2}{\text{r}}$$ B) $$\left( {{\omega _1} - {\omega _2}} \right){\text{r}}$$ C) $$\left( {{\omega _1} + {\omega _2}} \right){\text{r}}$$ D) $$\left( {{\omega _1} - {\omega _2}} \right)2{\text{r}}$$

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Answer & Solution

Answer: Option B

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68

The critical speed of a shaft with a disc supported in between is equal to the natural frequency of the system in

A) Transverse vibrations B) Torsional vibrations C) Longitudinal vibrations D) All of these

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Answer: Option A

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69

The equation of motion for a single degree of freedom system with viscous damping is $$4\frac{{{{\text{d}}^2}{\text{x}}}}{{{\text{d}}{{\text{t}}^2}}} + 9\frac{{{\text{dx}}}}{{{\text{dt}}}} + 16{\text{x}} = 0.$$ The damping ratio of the system is

A) $$\frac{9}{8}$$ B) $$\frac{9}{{8\sqrt 2 }}$$ C) $$\frac{9}{{16}}$$ D) $$\frac{9}{{128}}$$

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Answer & Solution

Answer: Option C

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70

Crowning on pulleys helps

A) In increasing velocity ratio B) In decreasing the slip of the belt C) For automatic adjustment of belt position so that belt runs centrally D) Increase belt and pulley life

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Answer: Option C

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Theory Of Machine MCQ Questions & Answers | Mechanical Engineering