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When the efficiency of an otto cycle will approach that of carnot cycle? Even with nest possible arrangements, the thermal efficiency of a gas turbine cycle is always equal to which percentage?
If the turbine has an efficiency of 90%, Calulate the turbine net work in kW, actual turbine exit temperature and entropy.
A force of 100 lbf at -30 degrees to the right of the centar line a) find the magnatude and direction of the total force (Ft=F1+F2) b)find the magnatude and direction of the acceleration.
Determine the pressure difference between the ends (along the long axis of the tank) when the truck undergoes an acceleration of 5 ft/s2.
Determine the temperature of the ball after 10 seconds? (Properties of aluminum, density=2700 kg/m^3, Cp=896 J/kg C, k=236 W/m C and gamma=k/density *Cp)
Assume you have 1.7 lbm of atmospheric air at 90 F. Into it you spray 0.009 lbm of water at 65 F. Does the water enter as saturated liquid, saturated vapor, compressed liquid, or superheated vapor?
It is desired to double the efficiency of a carrot heat engine from 30% by raising its temperatureof heat addition, while keeping the temperature of heat rejection constant.
What couple must be applied to the middle-sized gear so that the system is in equilibrium? If r = 10cm, what are the reaction forces between the gears?
There are two gears one with radius r and the other with radius 2.2r. What couple must be applied to the smaller gear so that the system is a in static equilibrium?
The tank and left on until the tank is observed to have saturated vapor only as the final state. Calculate a) volume b) final temp of steam and c) time the heater was left on to reach the final stat
The pressure of the flow at the turbine exit is 225 kPa. Neglect delta KE and delta PE. Calculate a) the exit temperature and b) the power output from the turbine.
Determine a) the change in specific entropy of the water, b) the change in specific entropy of the reservoir, and c) the entropy production per unit mass of the entire process.
A rigid tank contains an ideal gas at 40%u2070C that is being stirred by a paddle wheel. Determine the specific entropy change of the ideal gas and the entropy produced per unit mass during this proce
The system undergoes a polytropic process resulting in the final state of 280 kPa and 100 degrees C. Determine a) the polytropic coefficient and b) the associated boudary work.
A light fixture holds two lightbulbs. Bulb A is of a type whos lietime is nomally distributed with mean 800 hours and standard deviation 100 hours. What is the probability that bulb B lasts longer t
A cylinder with a moveable piston holds .20 lb of hydrogen initially in a volume of 1 cu ft at a tem-perature of 1300 F. How much heat has been transferred to the gas?
During this process, the piston-cylinder system is interacting with a thermal reservoir held at a constant 290 K. Determine the entropy produced during this process.
Oxygen at a pressure, temperature, and volume of 40 psia, 800F, and 20 ft3 undergoes a constant vol-ume process to a pressure of 60 psia. Determine T2, WORK done, and heat added during this process.
If the air is cooled until the pressure falls to 32 psia, what is the final temperature of the gas in degrees Fahren-heit? How much heat is added per pound of air?
One pound of silver at 5000F is plunged into four pounds of water at 600F in a manner such that no wa-ter is evaporated. Calculate the final temperature of the silver and water?
The pressure drops by 25 kPa across the condenser as heat is extracted to a 30C thermal reservoir. If the water exits as a saturate liquid, determine the change in specific entropy of the water.
Refrigerant Gas (r-134) at 500k and 70 degrees C enters an air-cooled condenser (heat exchanger) and leaves the condenser as saturated liquid at 500 kPa.
Heat is then added to the gas until the piston moves up compressing the spring by 8 cm. The barometric pressure is 750 mm Hg (S.G = 13.6). Calculate the intitial and final pressure inside the cylind
A vertical piston-cylinder assembly contains 0.3 kg of air( k=1.4, R=287 J/kg*K) initially at 155 kPa and 27 degree C. Find The volumes corresponding to all three states.
A 1000-W electric resistance heater placed in the tank is turned on and left on unitl the tank is observed to have saturated vapor only as the final state. Calculate the volume of the tank.