Related Questions
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The maximum frictional force, which comes into play, when a body just begins to slide over the surface of the other body, is known as
D. Coefficient of friction
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4
The velocity ratio of a single purchase crab winch can be increased by
A. Increasing the length of the handle
B. Increasing the radius of the load drum
C. Increasing the number of teeth of the pinion
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A smooth cylinder lying on a __________ is in neutral equilibrium.
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If a body is acted upon by a number of coplanar non-concurrent forces, it may
A. Rotate about itself without moving
B. Move in any one direction rotating about itself
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In order to determine the effects of a force, acting on a body, we must know
A. Magnitude of the force
B. Line of action of the force
C. Nature of the force i.e. whether the force is push or pull
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In a single threaded worm and worm wheel, the number of teeth on the worm is 50. The diameter of the effort wheel is 100 mm and that of load drum is 50 mm. The velocity ratio is
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A flywheel on a motor goes from rest to 1000 rpm in 6 sec. The number of revolutions made is nearly equal to
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A machine having an efficiency less than 50%, is known as
B. Non-reversible machine
C. Neither reversible nor non-reversible machine
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The time of flight of a projectile on downward inclined plane depends upon
B. Angle of inclination of the plane
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A smooth cylinder lying on its convex surface remains in __________ equilibrium.
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Moment of inertia of a triangular section of base (b) and height (h) about an axis passing through its vertex and parallel to the base, is __________ than that passing through its C.G. and parallel to the base.
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According to principle of moments
A. If a system of coplanar forces is in equilibrium, then their algebraic sum is zero
B. If a system of coplanar forces is in equilibrium, then the algebraic sum of their moments about any point in their plane is zero
C. The algebraic sum of the moments of any two forces about any point is equal to moment of the resultant about the same point
D. Positive and negative couples can be balanced
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The range of projectile on a downward inclined plane is ________ the range on upward inclined plane for the same velocity of projection and angle of projection.
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Lami's theorem states that
A. Three forces acting at a point will be in equilibrium
B. Three forces acting at a point can be represented by a triangle, each side being proportional to force
C. If three forces acting upon a particle are represented in magnitude and direction by the sides of a triangle, taken in order, they will be in equilibrium
D. If three forces acting at a point are in equilibrium, each force is proportional to the sine of the angle between the other two
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The angle between two forces when the resultant is maximum and minimum respectively are:
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If rain is falling in the opposite direction of the movement of a pedestrian, he has to hold his umbrella
A. More inclined when moving
B. Less inclined when moving
C. More inclined when standing
D. Less inclined when standing
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4
In a framed structure, as shown in the below figure, the forces in the members AB and BC are respectively
A. √3. W (tensile) and 2W (compressive)
B. 2W (tensile) and √3. W (compressive)
C. 2√3. W (tensile) and 2√3. W (compressive)
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4
In ideal machines
A. Mechanical advantage is greater than velocity ratio
B. Mechanical advantage is equal to velocity ratio
C. Mechanical advantage is less than velocity ratio
D. Mechanical advantage is unity
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4
The length of a second's pendulum is
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The bellow figure shows the three coplanar forces P, Q and R acting at a point O. If these forces are in equilibrium, then
A. P/sin β = Q/sin α = R/sin
B. P/sin α = Q/sin β = R/sin
C. P/sin = Q/sin α = R/sin β
D. P/sin α = Q/sin = R/sin β
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A force acting on a body may
B. Balance the other forces acting on it
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Moment of inertia of a rectangular section having width (b) and depth (d) about an axis passing through its C.G. and parallel to the depth (d), is
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Joule is the unit of
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The force required to move the body up the plane will be minimum if it makes an angle with the inclined plane __________ the angle of friction.
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The C.G. of a right circular solid cone of height h lies at the following distance from the base
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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.
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The slope on the road surface generally provided on the curves is known as
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The forces, whose lines of action are parallel to each other and act in the same directions, are known as
A. Coplanar concurrent forces
B. Coplanar non-concurrent forces
D. Unlike parallel forces
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The moment of inertia of a thin rod of mass m and length l, about an axis through its centre of gravity and perpendicular to its length is
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The potential energy of a vertically raised body is __________ the kinetic energy of a vertically falling body.