The mechanical advantage of Class III lever is always:
less than 1
greater than 1
1
None of these
The ideal mechanical advantage of a lever in which the effort arm is 60 cm and the load arm is 4 cm.
15
20
30
40
Which of the following statements is not true for a machine?
It always has efficiency less than 100 %.
Its mechanical advantage can be less than 1.
It can also be used as a speed multiplier.
It can have a mechanical advantage greater than the velocity ratio.
A movable pulley is used as:
force multiplier
speed multiplier
device to change the direction of effort
all the above
The opposing force to be overcome by a machine is:
Effort
Load
Fulcrum
Both a and b
The ideal mechanical advantage of lever in which the effort arm is 50 cm and load arm is 5 is
10
5
6
7
Seesaw is an example for:
Class I Lever
Class II Lever
Class III Lever
Class I & II Lever
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
Nut cracker is an example for:
Class I lever
Class II lever
Class III lever
Class I & II lever
Mechanical advantage (MA), load and effort related as
MA = L x E
MA x E = L
E = MA x L
