Free Printable Engineering Mechanics

1.

The resultant of two forces P and Q is R. If one of the forces is reversed in direction, the resultant is S. Which of the following is true for the identity $R^2-S^2=2PQ$ ?

a)

Forces are collinear

b)

Forces act at right angles to each other

c)

Forces act at 60° to each other

d)

Forces can have any angle of inclination between them

2.

Which of the following quantity can have negative values?

a)

Moment of inertia or 2nd Moment of area

b)

Mass moment of inertia or 2nd moment of mass

c)

Product moment of inertia

d)

All the options

3.

In case of second class lever, which of the following is correct

a)

The load is in between fulcrum and effort

b)

The effort is in between fulcrum and load

c)

Fulcrum is in between load and effort

d)

None of these

4.

The time period of a simple pendulum is independent of the amplitude of vibration provided angular amplitude does not exceed 4°

a)

Law of mass

b)

Law of length

c)

Law of isochronism

d)

Law of acceleration due to gravity

5.

A ball is dropped from a height h1 and it rebounds to a height h2 then the coefficient of restitution e, is defined by the equation

a)

$e=\frac{h_1}{h_2}$

b)

$e=\frac{h_2}{h_1}$

c)

$e=\sqrt{\frac{h_1}{h_2}}$

d)

$e=\sqrt{\frac{h_2}{h_1}}$

6.

The resultant of the two forces Pand Q is R. If Q is doubled, the new resultant is perpendicular to P. Then

a)

$P=Q$

b)

$Q=R$

c)

$Q=2R$

d)

None of these

7.

In a screw jack, the effort required to lift the load is given by

a)

$P=W\ \tan\ \left(\alpha+\phi\right)$

b)

$P=W\ \tan\ \left(\alpha-\phi\right)$

c)

$P=W\ \tan\ \left(\phi-\alpha\right)$

d)

$P=W\ \cos\ \left(\alpha-\phi\right)$

8.

The third class lever is otherwise called

a)

Load multiplier lever

b)

Speed multiplier lever

c)

Effort multiplier lever

d)

None of these

9.

Which of the following is correct

a)

1 metric hp = 735.5 watts

b)

1imperial hp = 1 meric hp

c)

1 erg = 10^7 Joules

d)

1 imperial hp = 746 Joules

10.

For a self-locking machine efficiency must be

a)

$equal\ to\ 50\%$

b)

$less\ than\ 50\%$

c)

$greater\ than\ 50\%$

d)

$100\%$

Engineering Mechanics

Total questions: 10

Worksheet time: 5mins

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