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This inefficiency can be attributed to three causes. There is an overall theoretical limit to the efficiency of any heat engine due to temperature, called the Carnot efficiency. Second, specific types of engines have lower limits on their efficiency due to the inherent irreversibility of the engine cycle they use. Thirdly, the non ideal behaviour of real engines, such as mechanical friction and losses in the combustion process causes further efficiency losses.

OR

· friction of moving parts

· inefficient combustion

· heat loss from the combustion chamber

· departure of the working fluid from the thermodynamic properties of an ideal gas

· aerodynamic drag of air moving through the engine

· energy used by auxiliary equipment like oil and water pumps

· inefficient compressors and turbines

· imperfect valve timing

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What is the ideal efficiency of an automobile engine where fuel is heated to 2900 K and the outdoor air is at 285 K?

The ideal efficiency of a Carnot engine can be calculated using the formula: Efficiency = 1 - (T_cold / T_hot), where T_cold is the temperature of the cold reservoir (in this case, 285 K) and T_hot is the temperature of the hot reservoir (2900 K). Plugging in the values, the ideal efficiency would be 1 - (285/2900) = 0.902 or 90.2%.


What is the mechanical efficiency of a inclined plane?

The mechanical efficiency of an inclined plane is the ratio of the output force to the input force, taking into account friction and other factors that may reduce efficiency. It is calculated as the ratio of the ideal mechanical advantage to the actual mechanical advantage. A perfectly efficient inclined plane would have a mechanical efficiency of 100%, but in reality, efficiency will be less than 100% due to energy losses.


Does an ideal machine have an effciency of 100 percent?

No, an ideal machine cannot have an efficiency of 100 percent. This is because some energy is always lost as heat due to factors like friction and resistance. The best an ideal machine can achieve is an efficiency of 100% by having no energy losses.


In what machine does work input equals work output?

In practical there is no machine which have efficiency 100%,i.e. output work = input work. But an ideal machine have efficiency of 100%, for an example a Carnot's heat engine. The efficiency of this engine is 100% but it is an ideal situation. As an expression of efficiency it is equal to W/Q, where W is work done by the system and Q is heat put into the system. For efficiency =1 ,i.e.100% if and only if W=Q and vice verse.


Does an ideal machine would have an efficiency greater than one?

No, an efficiency greater than one would not be possible, since that would violate a very fundamental law of physics: conservation of energy. The efficiency of an "ideal machine" would be one, in many cases; the efficiency of an ideal Carnot engine would be less than one.

Related Questions

What factors reduce the efficiency of a heat engine from its ideal value.?

friction, imperfect insulation


What is the ideal efficiency of an automobile engine where fuel is heated to 2900 K and the outdoor air is at 285 K?

The ideal efficiency of a Carnot engine can be calculated using the formula: Efficiency = 1 - (T_cold / T_hot), where T_cold is the temperature of the cold reservoir (in this case, 285 K) and T_hot is the temperature of the hot reservoir (2900 K). Plugging in the values, the ideal efficiency would be 1 - (285/2900) = 0.902 or 90.2%.


What is the mechanical efficiency of a inclined plane?

The mechanical efficiency of an inclined plane is the ratio of the output force to the input force, taking into account friction and other factors that may reduce efficiency. It is calculated as the ratio of the ideal mechanical advantage to the actual mechanical advantage. A perfectly efficient inclined plane would have a mechanical efficiency of 100%, but in reality, efficiency will be less than 100% due to energy losses.


Does an ideal machine have an effciency of 100 percent?

No, an ideal machine cannot have an efficiency of 100 percent. This is because some energy is always lost as heat due to factors like friction and resistance. The best an ideal machine can achieve is an efficiency of 100% by having no energy losses.


Why doesn't any system have 100 percent efficiency?

frictionIn real machines, as opposed to ideal machines, there is always friction that reduces the efficiency of the machine. Lubricants like oil can be used to reduce friction and improve efficiency.


What is the ideal height of a keyboard for ergonomic comfort and efficiency?

The ideal height for a keyboard for ergonomic comfort and efficiency is generally considered to be at elbow height when sitting with your arms at a 90-degree angle. This position helps to reduce strain on the wrists and shoulders while typing.


What factors should be considered when determining the ideal woodworking shop size for optimal functionality and efficiency?

When determining the ideal woodworking shop size for optimal functionality and efficiency, factors to consider include the amount of space needed for tools and equipment, workbench area, storage for materials, adequate lighting and ventilation, workflow efficiency, safety considerations, and future expansion possibilities.


How does the thermal efficiency of an ideal Otto Cycle change with the compression ratio of the engine and the specific heat ratio of the working fluid?

The answer is 38.


In what machine does work input equals work output?

In practical there is no machine which have efficiency 100%,i.e. output work = input work. But an ideal machine have efficiency of 100%, for an example a Carnot's heat engine. The efficiency of this engine is 100% but it is an ideal situation. As an expression of efficiency it is equal to W/Q, where W is work done by the system and Q is heat put into the system. For efficiency =1 ,i.e.100% if and only if W=Q and vice verse.


Does an ideal machine would have an efficiency greater than one?

No, an efficiency greater than one would not be possible, since that would violate a very fundamental law of physics: conservation of energy. The efficiency of an "ideal machine" would be one, in many cases; the efficiency of an ideal Carnot engine would be less than one.


What is propulsion efficiency?

It is efficiency of the propelling device in converting the applied torque into useful thrust. In an IDEAL propeller the freestream velocity and the slipstream velocity should be same. The higher the exhaust/slip stream velocity, higher is the wasted kinetic energy. Thus turbojet engine has lower propulsive efficiency and turbo-prop engine has higher propulsive efficiency.


Does an ideal machine have friction?

No, an ideal machine is usually considered to be frictionless to simplify calculations and convey fundamental concepts. In reality, all machines have some level of friction, which can reduce efficiency and introduce energy losses.