Engineering Mechanics MCQ Questions & Answers

21

A machine having an efficiency less than 50%, is known as

A) Reversible machine B) Non-reversible machine C) Neither reversible nor non-reversible machine D) Ideal machine

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Answer & Solution

Answer: Option B

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22

Which is the correct statement about law of polygon of forces?

A) If any number of forces acting at a point can be represented by the sides of a polygon taken in order, then the forces are in equilibrium B) If any number of forces acting at a point can be represented in direction and magnitude by the sides of a polygon, then the forces are in equilibrium C) If a polygon representing forces acting at a point is closed then forces are in equilibrium D) If any number of forces acting at a point can be represented in direction and magnitude by the sides of a polygon taken in order, then the forces are in equilibrium

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Answer & Solution

Answer: Option D

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23

Which of the following is an equation of linear motion?
(where, u and v = Initial and final velocity of the body, a = Acceleration of the body and s = Displacement of the body in time t seconds.)

A) v = u + at B) s = ut + $$\frac{1}{2}$$ at² C) v² = u² + 2as D) All of these

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Answer & Solution

Answer: Option D

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24

The moment of inertia of a thin disc of mass ‘m’ and radius ‘r’, about an axis through its center of gravity and perpendicular to the plane of the disc is

A) $$\frac{{{\text{m}}{{\text{r}}^2}}}{2}$$ B) $$\frac{{{\text{m}}{{\text{r}}^2}}}{4}$$ C) $$\frac{{{\text{m}}{{\text{r}}^2}}}{6}$$ D) $$\frac{{{\text{m}}{{\text{r}}^2}}}{8}$$

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Answer & Solution

Answer: Option A

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25

If three forces acting in different planes can be represented by a triangle, these will be in

A) Non-equilibrium B) Partial equilibrium C) Full equilibrium D) Unpredictable

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Answer & Solution

Answer: Option A

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26

The velocity ratio of a differential wheel and axle with 'D' as the diameter of effort wheel and d₁ and d₂ as the diameters of larger and smaller axles respectively, is

A) $$\frac{{\text{D}}}{{{{\text{d}}_1} + {{\text{d}}_2}}}$$ B) $$\frac{{\text{D}}}{{{{\text{d}}_1} - {{\text{d}}_2}}}$$ C) $$\frac{{2{\text{D}}}}{{{{\text{d}}_1} + {{\text{d}}_2}}}$$ D) $$\frac{{2{\text{D}}}}{{{{\text{d}}_1} - {{\text{d}}_2}}}$$

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Answer & Solution

Answer: Option D

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27

A circular hole of 50 mm diameter is cut out from a circular disc of 100 mm diameter as shown in the below figure. The center of gravity of the section will lie
Engineering Mechanics mcq question image

Engineering Mechanics mcq question image

A) In the shaded area B) In the hole C) At ‘O’ D) None of these

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Answer & Solution

Answer: Option A

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28

A framed structure is perfect if it contains members equal to (where, n = number of joints in a frame)

A) 2n³ B) 2n C) n² D) 3n²

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Answer & Solution

Answer: Option A

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29

The velocity ratio of a simple wheel and axle with D and d as the diameters of effort wheel and load axle, is

A) D + d B) D - d C) D × d D) $$\frac{{\text{D}}}{{\text{d}}}$$

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Answer & Solution

Answer: Option D

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30

A screw jack used for lifting the loads is

A) A reversible machine B) A non-reversible machine C) An ideal machine D) None of these

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Answer & Solution

Answer: Option B

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Engineering Mechanics MCQ Questions & Answers | Mechanical Engineering