Advertisements
Advertisements
प्रश्न
A machine is 75% efficient’. What do you understand by this statement?
उत्तर
If a machine is 75% efficient, it means that 75% of the work input to the machine is obtained as the useful work output. The remaining 25% of the work input has been lost in overcoming the friction.
APPEARS IN
संबंधित प्रश्न
What is the principle on which a machine works?
Answer the following in short.
Mention any two methods by which we can take care of machines.
The correct relationship between the mechanical advantage (M.A.), the velocity ratio (V.R.) and the efficiency (n) is ______.
The mechanical advantage of an inclined place is always:
(a) less than 1
(b) equal to 1
(c) greater than 1
(d) nothing can be said
Write the relation between mechanical advantage, velocity ratio and efficiency.
Give an example where a machine is used to obtain gain in speed.
How does a machine work?
(i) Calculate the mechanical advantage of the lever shown in the figure.
(ii) How do you define the mechanical advantage of a machine?
Classify the following as a lever, a pulley and an inclined plane:
An opener
The ______ in the centre, the ______ on one side and the ______ on the other side make a lever of the second order.
