Theory Of Machine MCQ Questions & Answers

91

When the radius of rotation of balls __________ as the equilibrium speed increases, the governor is said to be unstable.

A) Remains constant B) Decreases C) Increases D) None of these

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Answer & Solution

Answer: Option B

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92

The working depth of a gear is the radial distance from the

A) Pitch circle to the bottom of a tooth B) Pitch circle to the top of a tooth C) Top of a tooth to the bottom of a tooth D) Addendum circle to the clearance circle

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Answer & Solution

Answer: Option D

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93

The natural frequency of free transverse vibrations due to uniformly distributed load acting over a simply supported shaft is (where $$\delta {\text{S}}$$ = Static deflection of simply supported shaft due to uniformly distributed load)

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

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Answer & Solution

Answer: Option B

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94

Module of a gear is

A) $$\frac{{\text{D}}}{{\text{T}}}$$ B) $$\frac{{\text{T}}}{{\text{D}}}$$ C) $$\frac{{{\text{2D}}}}{{\text{T}}}$$ D) $$\frac{{{\text{2T}}}}{{\text{D}}}$$

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Answer & Solution

Answer: Option A

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95

The dynamic friction is the friction experienced by a body, when the body

A) Is in motion B) Is at rest C) Just begins to slide over the surface of the other body D) None of the above

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Answer & Solution

Answer: Option A

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96

The swaying couple is maximum or minimum when the angle of inclination of the crank to the line of stroke (θ) is equal to

A) 90° and 180° B) 45° and 225° C) 180° and 270° D) 270° and 360°

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Answer & Solution

Answer: Option B

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97

The tractive force is maximum or minimum when the angle of inclination of crank with the line of stroke (θ) is equal to

A) 0° and 90° B) 90° and 180° C) 135° and 315° D) 270° and 360°

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Answer & Solution

Answer: Option C

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98

Minimum number of teeth for involute rack and pinion arrangement for pressure angle of 20° is

A) 10 B) 20 C) 30 D) 34

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Answer & Solution

Answer: Option A

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99

In railway axle boxes, the bearing used is

A) Deep groove ball bearing B) Double row self aligning ball bearing C) Double row spherical roller bearing D) Cylindrical roller bearing

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Answer & Solution

Answer: Option C

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100

In a multiple V-belt drive, when a single belt is damaged, it is preferable to change the complete set to

A) Reduce vibration B) Reduce slip C) Ensure uniform loading D) Ensure proper alignment

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Answer & Solution

Answer: Option C

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Theory Of Machine MCQ Questions & Answers | Mechanical Engineering