The maximum efficiency of a scres jack having square threads and friction angle of 30 degree will be
A.9%
B.11%
C.20%
D.33%
E.5%
Category: Applied Mechanics Mcqs
The limiting force of fiction is
A.The value of friction force which stops the movement of the body
B.The value of friction force which cannot exceed under a situation
C.The friction force acting when the body is just about to move
D.The friction force acting on a body when it is in motion
E.Double of the normal friction
When all the forces acting on a body lie in one plane and their lines of action meet at one point, the forces
A.constitute a couple
B.constitute a moment
C.are known as non-coplaner forces
D.are known as coplaner-concurrent forces.
For the maximum range of a projectile the angle of projection should be
A.22
B.30?
C.45?
D.15?
E.90?
The statement —- if three forces acting at a point are in equilibrium, each force is proportional to the sine of the angle between the other two —- is known as
A.Law of triangle of forces
B.Lami’s theorem
C.D’Alembert’s principle
D.Law of polygon of forces
E.Newtons law of forces
Power required for a train weighing 200 Mg to move at a uniform speed of 60 Kmph up an incline of 1 in 200 is (Resistance due to friction is negligible)
A.9810 KW
B.1000 KW
C.16.67 KW
D.163.5 KW
A flywheel 200 cm in diameter is rotating at 100 rpm. A point on the rim of the flywheel will not have
A.angular velocity
B.centripental acceleration
C.tangential acceleration
D.all of the above
If two bodies one light and one heavy have equal kinetic energies, which one has a greater momentum?
A.Heavy body
B.Light body
C.Both have equal momentum
D.Momentum depends on velocities
E.Nothing can be concluded on the basis of information provided
The resultant of coplaner parallel forces is found by load line diagram, while the position is found by
A.link polygen
B.funicular polygon
C.string polygon
D.any of the above
