Advertisements
Advertisements
प्रश्न
State the incorrect statement:
विकल्प
A machine always has efficiency less than 100%.
The mechanical advantage of a machine can be less than 1.
A machine can be used as speed multiplier.
A machine can have the mechanical advantage greater than the velocity ratio.
Advertisements
उत्तर
A machine can have the mechanical advantage greater than the velocity ratio.
Reason:
If the mechanical advantage of a machine is greater than its velocity ratio, then it would mean that the efficiency of a machine is more than 100%, which is practically not possible.
APPEARS IN
संबंधित प्रश्न
A scissor is a _________ multiplier
What is the principle of an ideal machine?
Two forces each of 5N act vertically upwards and downwards respectively on the two ends of a uniform metre rule which is placed at its mid-point as shown in the diagram. Determine the magnitude of the resultant moment of these forces about the midpoint.
State four ways in which machines are useful to us.
Mechanical advantage (M.A.), load (L) and effort (E) are related as ______.
The diagram below shows a claw hammer used to remove a nail :
(i) To which class of lever does it belong ?
(ii) Give one more example of the same class of lever mentioned by you in (i) for which the mechanical advantage is greater than one.
Work is the application of a ....... through a distance.
Shows a lemon crusher.
- In the diagram, mark the position of the fulcrum F and the line of action of load L and effort E.
- Name the class of lever
Complete the following sentence :
A scissors is a ___________ multiplier.
What is a machine?
