Theory Of Machine MCQ Questions & Answers

81

If the controlling force line for a spring controlled governor when produced intersects the Y-axis at the origin, then the governor is said to be

A) Stable B) Unstable C) Isochronous D) None of these

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Answer & Solution

Answer: Option C

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82

When the speed of the engine fluctuates continuously above and below the mean speed, the governor is said to be

A) Stable B) Unstable C) Isochronous D) Hunt

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Answer & Solution

Answer: Option D

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83

A single degree of freedom system is given by, $$m \times \frac{{{d^2}x}}{{d{t^2}}} + c \times \frac{{dx}}{{dt}} + sx = F\cos \omega t$$ with usual notations. It represents

A) Free vibration with damping B) Free vibration without damping C) Forced vibration with damping D) Forced vibration without damping

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Answer & Solution

Answer: Option C

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84

A mechanism _________ for transmitting or transforming motion.

A) Can be used B) Can not be used C) Unpredictable D) None of these

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Answer & Solution

Answer: Option A

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85

The motion between a pair which takes place in __________ is known as incompletely constrained motion.

A) One direction only B) Two directions only C) More than one direction D) None of these

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Answer & Solution

Answer: Option C

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86

When the body is suspended at the point of suspension, its periodic time and frequency will be ________ as compared to the body suspended at the point of percussion.

A) Same B) Two times C) Four times D) None of these

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Answer & Solution

Answer: Option A

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87

Length of arc of contact is given by

A) Arc of approach - Arc of recess B) Arc of approach + Arc of recess C) $$\frac{{{\text{Arc of approach}}}}{{{\text{Arc of recess}}}}$$ D) Arc of approach × Arc of recess

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Answer & Solution

Answer: Option B

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88

To transmit power from one rotating shaft to another whose axes are neither parallel nor intersecting, use?

A) Spur gear B) Spiral gear C) Bevel gear D) Worm gear

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Answer & Solution

Answer: Option D

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89

In a band and block brake, the ratio of tensions on tight side and slack side of the band is (where $$\mu $$ = Coefficient of friction between the blocks and the drum, $$\theta $$ = Semi-angle of each block subtending at the center of drum and n = Number of blocks)

A) $$\frac{{{{\text{T}}_1}}}{{{{\text{T}}_2}}} = \mu \theta {\text{n}}$$ B) $$\frac{{{{\text{T}}_1}}}{{{{\text{T}}_2}}} = {\left( {\frac{{1 - \mu \tan \theta }}{{1 + \mu \tan \theta }}} \right)^{\text{n}}}$$ C) $$\frac{{{{\text{T}}_1}}}{{{{\text{T}}_2}}} = {\left( {\mu \theta } \right)^{\text{n}}}$$ D) $$\frac{{{{\text{T}}_1}}}{{{{\text{T}}_2}}} = {\left( {\frac{{1 + \mu \tan \theta }}{{1 - \mu \tan \theta }}} \right)^{\text{n}}}$$

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Answer & Solution

Answer: Option D

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90

The natural frequency of free transverse vibrations due to a point load acting over a simply supported shaft is equal to (where $$\delta $$ = Static deflection of a simply supported shaft due to the point load)

A) $$\frac{{0.4985}}{{\sqrt \delta }}$$ B) $$\frac{{0.5615}}{{\sqrt \delta }}$$ C) $$\frac{{0.571}}{{\sqrt \delta }}$$ D) $$\frac{{0.6253}}{{\sqrt \delta }}$$

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Answer: Option A

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Theory Of Machine MCQ Questions & Answers | Mechanical Engineering