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A 20 MW back-pressure turbine receives steam at 4 MPa and 300°C, exhausting from the last stage at 0.35 MPa. The stage efficiency is 0.85, reheat factor 1.04, and external losses 2% of the actual isentropic enthalpy drop. Determine the rate of steam flow. At the exit from the first stage nozzles, the steam velocity is 244 m/s, specific volume 68.6 dm3 /kg, mean diameter 762 mm, and steam exit angle 76 °measured from the axial direction. Determine the nozzle exit height of this stage.
Estimate the current at which a 1-mm-diameter nickel wire will burn out when submerged in water at atmospheric pressure. The electrical resistance of the wire is 0.129 D/m.
write the temperature of a cooling body as an exponential function of time. Is Newton's Law of Cooling still widely accepted? Are there any substitutes?
at the beginning of the compression process in an ideal otto cycle air is at 95 kpa 27 degree c and the temperature at
a 50 kg copper block initially at 350 degree c is quenched in a closed rigid insulated tank containing 120 l of liquid
one kilogram of water contained in a piston-cylinder assembly initially at 160oc 150 kpa undergoes an isothermal
find the solution to the vibrating string problem with the 1-d wave equation with a string of length 5 cm where the
A spherical balloon inflated sos that the volume is increasing at the rate of cubic meter/min. At what rate is the diameter increasing when the diameter is 12 m?
two oxygen o2 flows are combined to a single flow. one flow is 1.5 m3s at 25degc and the other is 2.5 m3s at 250degc
a large two-stage liquid rocket with mass of 30000 kg is to be launched from a sea-level launch pad. the main engine
a 50.0 g object moves on the end of a spring with spring constant k 25.0 nm. it is released with an initial
Air is expanded in a poly tropic process from a pressure and volume of 350 kPa and 0.03 m3 until its volume is increased by 6.667 times. The poly tropic process has an exponent n = 1.5
Oceans on Mars scientists have found evidence that Mars may once have had an ocean 0.500 km deep. The acceleration due to gravity on Mars is 3.71 mls'.
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