Related Questions
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In a screw jack, the effort required to lower the load is __________ the effort required to raise the same load.
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Whenever a force acts on a body and the body undergoes a displacement, then
A. Work is said to be done
B. Power is being transmitted
C. Body has kinetic energy of translation
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The friction experienced by a body, when at rest, is known as
D. Coefficient of friction
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A screw jack used for lifting the loads is
B. A non-reversible machine
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In actual 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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Two forces are acting at an angle of 120°. The bigger force is 40 N and the resultant is perpendicular to the smaller one. The smaller force is
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Three forces acting on a rigid body are represented in magnitude, direction and line of action by the three sides of a triangle taken in order. The forces are equivalent to a couple whose moment is equal to
B. Twice the area of the triangle
C. Half the area of the triangle
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The static friction
A. Bears a constant ratio to the normal reaction between the two surfaces
B. Is independent of the area of contact, between the two surfaces
C. Always acts in a direction, opposite to that in which the body tends to move
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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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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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The moment of inertia of a thin disc of mass m and radius r, about an axis through its centre of gravity and perpendicular to the plane of the disc is
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Two balls of equal mass and of perfectly elastic material are lying on the floor. One of the balls with velocity v is made to strike the second ball. Both the balls after impact will move with a velocity
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When a body falls freely under gravitational force, it possesses __________ weight.
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The coefficient of restitution for inelastic bodies is
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Which of the following is not the unit of pressure?
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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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A framed structure is imperfect, if the numbers of members are __________ (2j - 3).
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A weight of 1000 N can be lifted by an effort of 80 N. If the velocity ratio is 20, the machine is
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The centre of percussion of a solid cylinder of radius r resting on a horizontal plane will be
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The amplitude is always __________ radius of the circle.
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The energy possessed by a body, for doing work by virtue of its position, is called
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In the shown figure, if the angle of inclination of the plane is increased, then acceleration of the system will
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If a suspended body is struck at the centre of percussion, then the pressure on die axis passing through the point of suspension will be
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If a number of forces are acting at a point, their resultant is given by
C. (ΣV)2 +(ΣH)2 +2(ΣV)(ΣH)
D. √[(ΣV)2 +(ΣH)2 +2(ΣV)(ΣH)]
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The efficiency of a screw jack is maximum, when (where α = Helix angle, and φ = Angle of friction.)
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The point, through which the whole weight of the body acts, irrespective of its position, is known as
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The moment of a force
A. Is the turning effect produced by a force, on the body, on which it acts
B. Is equal to the product of force acting on the body and the perpendicular distance of a point and the line of action of the force
C. Is equal to twice the area of the triangle, whose base is the line representing the force and whose vertex is the point, about which the moment is taken
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The velocity of a particle moving with simple harmonic motion is __________ at the mean position.
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If the body falls freely under gravity, then the gravitational acceleration is taken as
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One kg force is equal to