Engineering Mechanics MCQ Questions & Answers

21

A block of mass 20 kg lying on a rough horizontal plane is connected by a light string passing over a smooth pulley to another mass 5 kg, which can move freely in the Vertical direction, as shown in the below figure. The tension in the string will ___________ with the increase in coefficient of friction.
Engineering Mechanics mcq question image

Engineering Mechanics mcq question image

A) Increase B) Decrease C) Not be effected D) None of these

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Answer & Solution

Answer: Option A

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22

The skidding away of the vehicle on a level circular path can be avoided if the force of friction between the wheels and the ground is __________ the centrifugal force.

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

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Answer & Solution

Answer: Option B

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23

The angle between two forces when the resultant is maximum and minimum respectively are

A) 0° and 180° B) 180° and 0° C) 90° and 180° D) 90° and 0°

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Answer & Solution

Answer: Option A

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24

The mechanical advantage of a lifting machine is the ratio of

A) Distance moved by effort to the distance moved by load B) Load lifted to the effort applied C) Output to the input D) All of the above

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Answer & Solution

Answer: Option B

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25

The efficiency of a lifting machine is the ratio of

A) Output to the input B) Work done by the machine to the work done on the machine C) Mechanical advantage to the velocity ratio D) All of the above

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Answer & Solution

Answer: Option D

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26

When the spring of a watch is wound, it will possess

A) Strain energy B) Kinetic energy C) Heat energy D) Electrical energy

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Answer & Solution

Answer: Option A

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27

The frequency of oscillation of a compound pendulum is (where k_G = Radius of gyration about the centroidal axis and h = Distance between the point of suspension and C.G. of the body.)

A) $$2\pi \sqrt {\frac{{{\text{gh}}}}{{{\text{k}}_{\text{G}}^2 + {{\text{h}}^2}}}} $$ B) $$2\pi \sqrt {\frac{{{\text{k}}_{\text{G}}^2 + {{\text{h}}^2}}}{{{\text{gh}}}}} $$ C) $$\frac{1}{{2\pi }}\sqrt {\frac{{{\text{gh}}}}{{{\text{k}}_{\text{G}}^2 + {{\text{h}}^2}}}} $$ D) $$\frac{1}{{2\pi }}\sqrt {\frac{{{\text{k}}_{\text{G}}^2 + {{\text{h}}^2}}}{{{\text{gh}}}}} $$

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Answer & Solution

Answer: Option C

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28

The velocity of a particle (v) moving with simple harmonic motion, at any instant is given by (where, r = Amplitude of motion and y = Displacement of the particle from mean position.)

A) $$\omega \sqrt {{{\text{y}}^2} - {{\text{r}}^2}} $$ B) $$\omega \sqrt {{{\text{r}}^2} - {{\text{y}}^2}} $$ C) $${\omega ^2}\sqrt {{{\text{y}}^2} - {{\text{r}}^2}} $$ D) $${\omega ^2}\sqrt {{{\text{r}}^2} - {{\text{y}}^2}} $$

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Answer & Solution

Answer: Option B

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29

If a given force (or a given system of forces) acting on a body __________ the position of the body, but keeps it in equilibrium, then its effect is to produce internal stress in the body.

A) Change B) Does not change C) Changes periodically D) None of these

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Answer & Solution

Answer: Option B

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30

The maximum height of a projectile on a horizontal plane, is

A) $$\frac{{{{\text{u}}^2}{{\sin }^2}\alpha }}{{2{\text{g}}}}$$ B) $$\frac{{{{\text{u}}^2}{{\cos }^2}\alpha }}{{2{\text{g}}}}$$ C) $$\frac{{{{\text{u}}^2}{{\sin }^2}\alpha }}{{\text{g}}}$$ D) $$\frac{{{{\text{u}}^2}{{\cos }^2}\alpha }}{{\text{g}}}$$

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Answer & Solution

Answer: Option A

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Engineering Mechanics MCQ Questions & Answers | Mechanical Engineering