# Compare the two stroke and four stroke engine in powe output and thermal efficiency?

compare the two stroke and four stroke engine in power output and thermal efficiency?

### What is definition of thermal efficiency of gas engine?

In general, efficiency is the ratio between the output of a device and the input, . For thermal efficiency, the input, , to the device is heat, or the heat-content of a fuel that is consumed. The desired output is mechanical work, , or heat, , or possibly both. From the first law of thermodynamics, the energy output can't exceed the input, so

### How do you calculate the efficiency of a machine?

Efficiency is nothing but calculating how the machine is performing for what it has been made for, Efficiency is usually calculated in % as (output/input )X100. for Eg. the Thermal efficiency of an reciprocating gasoline engine can be calculated as follows, Let, the input for an reciprocating engine is 12MJ and its out put is 4MJ then Efficiency is (4/12)X100 = 33%

### 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…

### How can you find the efficiency of an AGR nuclear reactor?

You can work out the gas flow from the gas circulator characteristics, and measure the reactor inlet and outlet temperatures, so you can work out the reactor thermal output. Then you can measure the thermal conditions in the steam circuit from feed flow and temperature and steam temperature and pressure, this will give the reactor thermal output together with the gas circulator heat input. From all this data work out the best estimate for the…

### Caltulation of turbine effiency which having multiple extraction?

You compare the btu input with the btu output. Divide the input into the output and that will give you the efficiency. With multiple extraction you will have to add all the uses. For example 100 million btuh input, with all sources of output having 82 million btuh- divide 100 into 82, for .82, or 82% efficiency.

### What are the supercharging limits for si engine and ci engine?

Limit of supercharging in si engine (1) knocking tendency in si engine increases with increase with temp pressure density of charge , mixture strength (2) compression ratio of engine needs reduced with supercharged engine but the reduced compression ratio reduce the power output output & thermal efficiency of engine with increase in s.f.c WHEREAS Limit of supercharging in CI Engines are mainly due to the thermal stresses and increased gas loading. Due to this, the…

### Why any engine have not the 100 percent efficiency?

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…

### Efficiency of computer?

Efficiency and effectiveness are often confused. Efficiency is the ratio of output to the input of a process. Always less than 100%. We may consider the power output of an engine compared with the power input needed for that output. Effectiveness is the usefulness of the output, compared to the costs (price - energy - complexity etc) of the process. For example, there are several methods for obtaining say the square root of a number…

### What is the efficiency of an engine when the heat input is 200000 joules and the waste heat is 150000joules?

Out of the 200KJ input, 150KJ isn't usable. The only usable output of the machine is the remaining 50KJ. The efficiency of that machine is 50KJ/200KJ = 25% . It must be pointed out, though, that it all depends on your definition of what is usable and non-usable output. For example, if this machine were labeled as an "Office Space Heater", then the 150KJ of heat would be the usable output, and the efficiency would…

### -if a generator in an oil-thermal power plant is 35 percent efficient and its output capacity is 3 000 MW what is the output power for the turbine generator system?

If the oil fired furnaces produce 3000 MW thermal, and the overall station efficiency is 35 percent, this means that the electrical power sent out is 1050 MWe. This assumes you do mean the overall station efficiency, ie that the power used for auxiliaries on the station is subtracted from the total electric power generated, before this figure is calculated.

### Define output efficiency?

efficiency eta = output / input where output is the amount of mechanical work or energy released by a process, and input is the quantity of work or energy used to run the process. Due to the principle of conservation of energy, energy efficiency within a closed system can never exceed 100%. At a loutspeaker you have electrical Voltage as input and sound pressure as output. The efficiency of the loudspeaker is really only 1…