12 Questions
What is the net work output of the ideal Brayton cycle with an isentropic efficiency of 80% and a backwork ratio of 0.4?
98 kJ/kg
What is the compressor work in a thermal power plant with a net power of 10 MW and a backwork ratio of 0.005?
50.25 kW
If the average energy in the nuclear reactor is 200 MeV/fission and there are 2.34x10^-19 fissions per second, what is the power output of the reactor?
750 MW
Calculate the brake power of a steam engine delivering 1000 kg/hr steam with enthalpies at entrance and exit of 3000 KJ/kg and 400 KJ/kg respectively, given a brake thermal efficiency of 20%.
144.44 kW
Determine the isentropic stagnation temperature of air flowing in a duct at a pressure of 150 kPa, velocity of 200 m/s, and temperature of 310 K.
332 K
What is the cooling tower efficiency if the cooling water leaves the condenser at 60°C and the ambient air temperature is 35°C DB and 28°C WB?
78%
What is the combustor efficiency of the gas turbine unit?
75.38%
What is the apparent gas constant of the ideal gas mixture?
0.208
What is the mass fraction of CO2 in the ideal gas mixture?
0.825
What is the thermal efficiency of the ideal diesel cycle under cold air standard conditions?
65%
What is the temperature of helium before the expansion process in the ideal otto cycle?
1700°C
What is the mean effective pressure for the ideal otto cycle?
599
Study Notes
Thermal Power Plants
- Ideal Brayton cycle: 80% isentropic efficiency, 0.4 backwork ratio
- Compressor work: 10 MW net power, 0.005 backwork ratio
- Nuclear reactor: 200 MeV/fission, 2.34x10^-19 fissions/second
- Power output: depends on energy per fission and fission rate
Steam Engines
- Brake power: 1000 kg/hr steam, 3000 KJ/kg entrance, 400 KJ/kg exit
- Brake thermal efficiency: 20%
Air Flow
- Isentropic stagnation temperature: 150 kPa pressure, 200 m/s velocity, 310 K temperature
Cooling Towers
- Cooling tower efficiency: 60°C water exit temperature, 35°C DB air temperature, 28°C WB air temperature
Gas Turbines
- Combustor efficiency: depends on gas turbine unit
Ideal Gas Mixtures
- Apparent gas constant: depends on ideal gas mixture
- Mass fraction of CO2: depends on ideal gas mixture
Ideal Cycles
- Thermal efficiency: ideal diesel cycle, cold air standard conditions
- Helium temperature: before expansion process, ideal otto cycle
- Mean effective pressure: ideal otto cycle
Test your knowledge of unit conversion and measurements in physics with this quiz. Questions include topics like standard acceleration due to gravity, conversion between radians and degrees, and angular measurement.
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