Engineering Mechanics MCQ Questions & Answers

81

The maximum mechanical advantage of a lifting machine is

A) 1 + m B) 1 - m C) $$\frac{1}{{\text{m}}}$$ D) m

Discuss

Answer & Solution

Answer: Option C

No explanation is given for this question. Let's Discuss on Board

82

According to law of triangle of forces

A) Three forces acting at a point will be in equilibrium B) Three forces acting at a point can be represented by a triangle, each side being proportional to force C) If three forces acting upon a particle are represented in magnitude and direction by the sides of a triangle, taken in order, they will be in equilibrium D) If three forces acting at a point are in equilibrium, each force is proportional to the sine of the angle between the other two

Discuss

Answer & Solution

Answer: Option C

No explanation is given for this question. Let's Discuss on Board

83

A smooth cylinder lying on its convex surface remains in __________ equilibrium.

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

Discuss

Answer & Solution

Answer: Option B

No explanation is given for this question. Let's Discuss on Board

84

Center of percussion is

A) The point of C.G. B) The point of metacenter C) The point of application of the resultant of all the forces tending to cause a body to rotate about a certain axis D) Point of suspension

Discuss

Answer & Solution

Answer: Option C

No explanation is given for this question. Let's Discuss on Board

85

The linear velocity of a body rotating at $$\omega $$ rad/s along a circular path of radius r is given by

A) $$\frac{\omega }{{\text{r}}}$$ B) $$\omega {\text{r}}$$ C) $$\frac{{{\omega ^2}}}{{\text{r}}}$$ D) $${\omega ^2}{\text{r}}$$

Discuss

Answer & Solution

Answer: Option B

No explanation is given for this question. Let's Discuss on Board

86

During elastic impact, the relative velocity of the two bodies after impact is __________ the relative velocity of the two bodies before impact.

A) Equal to B) Equal and opposite to C) Less than D) Greater than

Discuss

Answer & Solution

Answer: Option B

No explanation is given for this question. Let's Discuss on Board

87

For a self locking machine, the efficiency must be

A) Equal to 50% B) Less than 50% C) Greater than 50% D) 100%

Discuss

Answer & Solution

Answer: Option B

No explanation is given for this question. Let's Discuss on Board

88

Coefficient of friction depends upon

A) Area of contact only B) Nature of surface only C) Both (A) and (B) D) None of these

Discuss

Answer & Solution

Answer: Option B

No explanation is given for this question. Let's Discuss on Board

89

Coefficient of friction is the

A) Angle between normal reaction and the resultant of normal reaction and the limiting friction B) Ratio of limiting friction and normal reaction C) The friction force acting when the body is just about to move D) The friction force acting when the body is in motion

Discuss

Answer & Solution

Answer: Option B

No explanation is given for this question. Let's Discuss on Board

90

Pick up the incorrect statement from the following:

A) The C.G. of a circle is at its centre B) The C.G. of a triangle is at the intersection of its medians C) The C.G. of a rectangle is at the intersection of its diagonals D) The C.G. of a semicircle is at a distance of $$\frac{{\text{r}}}{2}$$ from the centre

Discuss

Answer & Solution

Answer: Option D

No explanation is given for this question. Let's Discuss on Board

Engineering Mechanics MCQ Questions & Answers | Mechanical Engineering