Exercise: Engineering Mechanics

Questions for: Engineering Mechanics

A ladder is resting on a smooth ground and leaning against a rough vertical wall. The force of friction will act
A:
towards the wall at its upper and
B:
away from the wall at its upper end
C:
downward at its upper end
D:
upward at its upper end
Answer: D
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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
Answer: D
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The three forces of 100 N, 200 N and 300 N have their lines of action parallel to each other but act in the opposite directions. These forces are known as
A:
coplaner concurrent forces
B:
coplaner non-concurrent forces
C:
like parallel forces
D:
unlike parallel forces
Answer: D
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A spherical body is symmetrical about its perpendicular axis. According to Routh's rule, the moment of inertia of a body about an axis passing through its centre of gravity is(where, M = Mass of the body, and S = Sum of the squares of the two semi-axes.)
A:
MS/3
B:
MS/4
C:
MS/5
D:
none of these
Answer: C
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The force induced in the string AB due to the load W, as shown in the below figure is
A:
W sin θ
B:
W cos θ
C:
W sec θ
D:
W cosec θ
Answer: D
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