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Strength of Materials

Strength of Materials
The coefficient of friction depends on

area of contact
shape of surfaces
strength of surfaces
nature of surface

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Strength of Materials
The effort required to lift a load W on a screw jack with helix angle a and angle of friction

Wtan(a-<)>)
Wcos(a + )
Wtan(a + <)>)
Wsin(a + <(>)

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Strength of Materials
Which of the following is not the unit of work, energy and heat ?

kg m
hp
kcal
kWhr

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Strength of Materials
Forces are called concurrent when their lines of action meet in

perpendicular planes
plane
two points
one point

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Strength of Materials
Pick up wrong statement about friction force for dry surfaces. Friction force is

proportional to normal load between the surfaces
dependent on the materials of contact surface
proportional to velocity of sliding
independent of the area of contact surfaces

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Strength of Materials
Effect of a force on a body depends upon

All of the listed here
magnitude
direction
position or line of action

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