Related Questions
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In a screw jack, the effort required to lift the load is given by (where W = Load lifted, α = Helix angle, and φ = Angle of friction.)
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The unit of force in S.I. units is
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The moment of inertia of a rectangular section 3 cm wide and 4 cm deep about X-X axis is
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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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Moment of inertia is the
A. Second moment of force
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In ideal machines, mechanical advantage is __________ velocity ratio.
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Which of the following statement is correct?
A. The algebraic sum of the forces, constituting the couple is zero
B. The algebraic sum of the forces, constituting the couple, about any point is the same
C. A couple cannot be balanced by a single force but can be balanced only by a couple of opposite sense
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The angle between two forces when the resultant is maximum and minimum respectively are:
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Coefficient of friction is the
A. Angle between normal reaction and the resultant of normal reaction and the limiting friction
B. Ratio of limiting friction and normal reaction
C. The friction force acting when the body is just about to move
D. The friction force acting when the body is in motion
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Coulomb friction is the friction between
A. Bodies having relative motion
C. Two lubricated surfaces
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The total momentum of a system of masses (i. e. moving bodies) in any one direction remains constant, unless acted upon by an external force in that direction. This statement is called
A. Newton's first law of motion
B. Newton's second law of motion
C. Principle of conservation of energy
D. Principle of conservation of momentum
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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.)
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The length of a second's pendulum is
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The force induced in the string AB due to the load W, as shown in the below figure is
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According to Lamis theorem
A. The three forces must be equal
B. The three forces must be at 120° to each other
C. The three forces must be in equilibrium
D. If the three forces acting at a point are in equilibrium, then each force is proportional to the sine of the angle between the other two
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The loss of kinetic energy during inelastic impact, is given by (where m1 = Mass of the first body, m2 = Mass of the second body, and u1 and u2 = Velocities of the first and second bodies respectively.)
A. [m₁ m₂/2(m₁ + m₂)] (u₁ - u₂)²
B. [2(m₁ + m₂)/m₁ m₂] (u₁ - u₂)²
C. [m₁ m₂/2(m₁ + m₂)] (u₁² - u₂²)
D. [2(m₁ + m₂)/m₁ m₂] (u₁² - u₂²)
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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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The necessary condition for forces to be in equilibrium is that these should be
C. Both (A) and (B) above
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When a person, on a bicycle, drives round a curve, he has to lean __________ to maintain equilibrium.
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The acceleration of a body sliding down an inclined surface is
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Moment of inertia of a triangular section of base (b) and height (h) about an axis passing through its C.G. and parallel to the base, is
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A pendulum which executes one beat per second is known as
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The velocity of a particle moving with simple harmonic motion is __________ at the mean position.
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The algebraic sum of the resolved parts of a number of forces in a given direction is equal to the resolved part of their resultant in the same direction. This is known as
A. Principle of independence of forces
B. Principle of resolution of forces
C. Principle of transmissibility of forces
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Two like parallel forces are acting at a distance of 24 mm apart and their resultant is 20 N. It the line of action of the resultant is 6 mm from any given force, the two forces are
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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 end
B. Away from the wall at its upper end
C. Downward at its upper end
D. Upward at its upper end
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Mass moment of inertia of a uniform thin rod of mass M and length (l) about its mid-point and perpendicular to its length is
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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 coefficient of restitution for inelastic bodies is
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Which of the following are vector quantities?