Theory Of Machine MCQ Questions & Answers

71

Inertia force acts

A) Perpendicular to the acceleration force B) Along the direction of acceleration force C) Opposite to the direction of acceleration force D) None of the above

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Answer & Solution

Answer: Option C

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72

The total number of instantaneous centers for a mechanism consisting of n links are

A) $$\frac{{\text{n}}}{2}$$ B) n C) n - 1 D) $$\frac{{{\text{n}}\left( {{\text{n}} - 1} \right)}}{2}$$

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Answer & Solution

Answer: Option D

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73

The rotating shafts tend to vibrate violently at whirling speeds because

A) The system is unbalanced B) Bearing centre line coincides with the axis C) The shafts are rotating at very high speeds D) Resonance is caused due to the heavy mass of the rotor

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Answer & Solution

Answer: Option D

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74

In a screw jack, the effort required to lift the load W is given by (where $$\alpha $$ = Helix angle and $$\varphi $$ = Angle of friction)

A) $${\text{P}} = {\text{W}}\tan \left( {\alpha - \varphi } \right)$$ B) $${\text{P}} = {\text{W}}\tan \left( {\alpha + \varphi } \right)$$ C) $${\text{P}} = {\text{W}}\tan \left( {\varphi - \alpha } \right)$$ D) $${\text{P}} = {\text{W}}\cos \left( {\alpha + \varphi } \right)$$

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Answer & Solution

Answer: Option B

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75

The efficiency of a screw jack is maximum, when (where $$\alpha $$ = Helix angle and $$\varphi $$ = Angle of friction)

A) $$\alpha = {45^ \circ } + \frac{\varphi }{2}$$ B) $$\alpha = {45^ \circ } - \frac{\varphi }{2}$$ C) $$\alpha = {90^ \circ } + \varphi $$ D) $$\alpha = {90^ \circ } - \varphi $$

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Answer & Solution

Answer: Option B

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76

A body will begin to move down an inclined plane, if the angle of inclination of the plane is ________ the angle of friction.

A) Equal to B) Less than C) Greater than D) None of these

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Answer & Solution

Answer: Option C

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77

The frictional torque transmitted in a conical pivot bearing, considering uniform pressure, is (where R = Radius of shaft and $$\alpha $$ = Semi-angle of the cone)

A) $$\frac{1}{2}\mu {\text{WRcosec}}\alpha $$ B) $$\frac{2}{3}\mu {\text{WRcosec}}\alpha $$ C) $$\frac{3}{4}\mu {\text{WRcosec}}\alpha $$ D) $$\mu {\text{WRcosec}}\alpha $$

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Answer & Solution

Answer: Option B

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78

A point on a link connecting double slider crank chain traces a

A) Ellipse B) Circle C) Parabola D) Hyperbola

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Answer & Solution

Answer: Option A

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79

The Whitworth quick return motion mechanism is formed in a slider crank chain when the

A) Coupler link is fixed B) Longest link is a fixed link C) Slider is a fixed link D) Smallest link is a fixed link

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Answer & Solution

Answer: Option A

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80

The arrangement is called bevel gearing, when two __________ are connected by gears.

A) Intersecting and coplanar shafts B) Non-intersecting and non-coplanar shafts C) Parallel and coplanar shafts D) Parallel and non-coplanar shafts

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Answer & Solution

Answer: Option A

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Theory Of Machine MCQ Questions & Answers | Mechanical Engineering