Class 11 Exam > Class 11 Questions > If a machine is lubricated with oila)the mech...
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If a machine is lubricated with oil
- a)the mechanical advantage of the machine increases
- b)both its mechanical advantage and efficiency increase
- c)the mechanical efficiency of the machine increases
- d)its efficiency increases, but its mechanical advantage decreases.
Correct answer is option 'C'. Can you explain this answer?
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If a machine is lubricated with oila)the mechanical advantage of the m...
When a machine is lubricated with oil friction decreases. Hence the mechanical efficiency of the machine increases.
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If a machine is lubricated with oila)the mechanical advantage of the m...
Mechanical efficiency of a machine is a measure of how effectively the machine converts input energy into useful output energy. It is defined as the ratio of output work to input work, expressed as a percentage. On the other hand, mechanical advantage is a measure of how much a machine multiplies force or changes the direction of force. In this question, the lubrication of a machine with oil affects its mechanical efficiency, but not its mechanical advantage.
Explanation:
Machine lubrication with oil
- When a machine is lubricated with oil, it means that a thin layer of oil is applied to the moving parts of the machine. The purpose of lubrication is to reduce friction between the moving parts, allowing them to move more smoothly and efficiently.
Effect on mechanical efficiency
- The application of oil reduces friction between the moving parts of the machine. As a result, less energy is lost to friction, and more of the input energy is converted into useful output energy. This increase in the amount of useful work done by the machine leads to an increase in mechanical efficiency.
Effect on mechanical advantage
- The mechanical advantage of a machine is determined by its design and does not change with lubrication. It is a measure of how much the machine amplifies or changes the input force. The lubrication of a machine does not affect its mechanical advantage because it does not change the design or configuration of the machine.
Conclusion
- From the above explanation, it can be concluded that when a machine is lubricated with oil, the mechanical efficiency of the machine increases. This is because the reduction in friction allows more of the input energy to be converted into useful work. However, the lubrication does not affect the mechanical advantage of the machine, as this is determined by its design and configuration. Therefore, the correct answer to the question is option 'C' - the mechanical efficiency of the machine increases.
Explanation:
Machine lubrication with oil
- When a machine is lubricated with oil, it means that a thin layer of oil is applied to the moving parts of the machine. The purpose of lubrication is to reduce friction between the moving parts, allowing them to move more smoothly and efficiently.
Effect on mechanical efficiency
- The application of oil reduces friction between the moving parts of the machine. As a result, less energy is lost to friction, and more of the input energy is converted into useful output energy. This increase in the amount of useful work done by the machine leads to an increase in mechanical efficiency.
Effect on mechanical advantage
- The mechanical advantage of a machine is determined by its design and does not change with lubrication. It is a measure of how much the machine amplifies or changes the input force. The lubrication of a machine does not affect its mechanical advantage because it does not change the design or configuration of the machine.
Conclusion
- From the above explanation, it can be concluded that when a machine is lubricated with oil, the mechanical efficiency of the machine increases. This is because the reduction in friction allows more of the input energy to be converted into useful work. However, the lubrication does not affect the mechanical advantage of the machine, as this is determined by its design and configuration. Therefore, the correct answer to the question is option 'C' - the mechanical efficiency of the machine increases.
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If a machine is lubricated with oila)the mechanical advantage of the machine increasesb)both its mechanical advantage and efficiency increasec)the mechanical efficiency of the machine increasesd)its efficiency increases, but its mechanical advantage decreases.Correct answer is option 'C'. Can you explain this answer?
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