For greater efficiency of a block and tackle pulley system,
the lower block should be of negligible weight
the upper and lower blocks should be of equal weight
the lower block should be heavier than the upper block
the weight of rope should be equal to the weight of pulleys
The correct relationship between the voltage ratio (VR) distance moved by load (dL) and distance moved by effort (dE) is.
VR = dL + dt
VR = dE x dL
Raising the weight of the body on toes is an example for:
Class I lever
Class II lever
Class III lever
None of these
Claw hammer is an example for:
Both Class I & II lever
The mechanical advantage of an inclined plane is always
less than 1
equal to 1
greater than 1
nothing can be said
For an ideal machine, the ratio of mechanical advantage (MA) to the velocity ratio (VR) is
depends on the value of load
A uniform seesaw 5 m long is supported at its centre. A boy weighing 40 kgf sits at a distance of 1 m from the centre of seesaw. To which class of lever does it belong?
Class I
Class II
Class III
Class I & II
Mechanical advantage (MA), load and effort related as
MA = L x E
MA x E = L
E = MA x L
Which of the following is odd?
Velocity ratio
Mechanical advantage
Efficiency
Work
The opposing force to be overcome by a machine is:
Effort
Load
Fulcrum
Both a and b