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.
Name a machine to multiply force ?
Name a machine to change the point of application of force ?
A force of 5 kgf is required to cut a metal sheet. A pair of shears used for cutting the metal sheet has its blades 5 cm long, while its handles is 10 cm long. What effort is needed to cut the sheet?
‘The force needed to push a load up an inclined plane is less than the force needed to lift it directly’ Give a reason.
What is the purpose of a machine?
Name a machine which can be used to multiply force and change the direction of force applied.
