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Why do all engines operate at less than 100 percent efficiency?
Wiki User
∙ 11y ago
According to the Kalvin - Plank statement:-
It is impossible to construct a device operating in a thermodynamic cycle. which produce no effect other than work output and exchange heat with a single reservoir
and if it will be possible then it will called the PMM-2 (Perpetual motion machine of second kind).
because if the engine exchange heat only with one thermal reservoir then the entire heat is converted into an equivelnt account of work and efficiency become 100%.
Wiki User
∙ 13y ago
Wiki User
∙ 11y agoA absorb heat
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Why don't modern fossil fuel power plants operate at or near 100 percent efficiency?
That's because they convert the energy to heat first. Do some reading about the Carnot cycle, or the theoretical Carnot engine; briefly, if (for example) the environmental temperature is 300K (27 degrees Celsius), and the heat engine operates at 900K (627 degrees Celsius), then the maximum theoretical efficiency is (900 - 300) / 900, or about 67%. The efficiency achieved in real machines, of course, will be less than that.
If the output work of a simple machine is than the input work the machine is said to have less than 100 percent efficiency?
input
If the output work of a simple machine is than input work the machine is said to have less than 100 percent efficiency?
please rephrase ur question so that it can be understood
The efficiency of an actual machine is always less than what percent?
It is always less than 100% Theoretical machines can have efficiencies of 100% but in practice there is always some energy loss Efficiencies of more than 100% are not allowed by the laws of thermodynamics!
How does mass effect efficiency?
The mass affects the efficiency of an object. It adds more weight, which causes more friction. More friction=less efficiency
Is it possible that in an engine there will be an 100 percent efficiency without the presence of friction and other irreversibility?
No. No engine can be 100% efficient. The Carnot cycle is mathematically proven to provide an upper bound for efficiency. The efficiency of the Carnot cycle can be calculated from the formula:eta = 1 - Tc/THwhereis eta is efficiencyTc is the temperature of the heat sinkTH is the temperature of the heat source.The only way to make the (theoretical) efficiency 100% would be to have a heat sink at absolute zero (which is impossible due to the 2nd law of thermodynamics) or to have the heat source at a temperature of infinity (which is impossible due to the 1st law). Real engines always operate at an efficiency less than the theoretical because they operate on a less efficient cycle and/or posses real irreversibility in their operation. Consequently no engine - real or theoretical - can operate at 100% efficiency.
What would cause the calorimeter efficiency to be less than 100 percent?
why is the efficiency of a calorimeter less than 100%
How fast can a jet aircraft go?
conventional jet engines (using a compressor) will operate at speeds up to slightly less than Mach 1using an afterburner a conventional jet engine can operate at speeds slightly above Mach 3ramjet engines will operate at speeds up to about Mach 5scramjet engines can operate at speeds well above Mach 6However the maximum speed of of an actual airplane is usually less than the capability of the engines it uses.
Why a normal machine could not have the mechanical efficiency of 100?
Because there is always going to be friction, the efficiency of any machine will always be less then 100 percent.
Why do most very small engines operate on 2 stroke?
Most small engines are two stroke because you can get more power from a smaller engine with two stroke rather than a four stroke engine. It takes less to cool and to operate the engine.
Thermal efficiency in a coal fired power plant?
It can be up to 40 percent in modern plants, less in old ones
Who is better gasoline engine or diesel engine?
diesel. Diesel engines tend to have better efficiency especially at less than full load. Gasoline/Petrol and LPG engines tend to have better power weight ratios.
What is the efficiency is the output work is 12000 and the input work is 15000?
Efficiency as a percent is output/input * 100%12000/15000 * 100% = 80% efficiency which makes sense, because it takes more work (input) than it give out (output). So the efficiency should be less than 100%.
Why jet engines are flown on high altitudes?
Reasons of efficiency. not the least of which is that the pressure generated in the combustion chamber has to fight less "back pressure" (think of it as pressure resistance) at high altitude because the air-pressure is less.
Why is mechanical efficiency always less than 100 percent?
That simply means that some energy is lost, due to friction and other causes.
Why don't modern fossil fuel power plants operate at or near 100 percent efficiency?
That's because they convert the energy to heat first. Do some reading about the Carnot cycle, or the theoretical Carnot engine; briefly, if (for example) the environmental temperature is 300K (27 degrees Celsius), and the heat engine operates at 900K (627 degrees Celsius), then the maximum theoretical efficiency is (900 - 300) / 900, or about 67%. The efficiency achieved in real machines, of course, will be less than that.
What are the main features and benefits of a jaw crusher?
1. Jaw plates are reversible. 2. Broken particle size uniformity, crushing ratio of high efficiency. 3. Less noise, dust, easy to operate. 4. Well-designed, easy to operate.
