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A large coal fired power plant has an efficiency of 45% and produces net 1500 MW of electricity. Coal releases 25000 kJ/kg as it burns so how much coal is used per hour?
Determine the fraction of the prototype speed in air at which the model test should be made in water to ensure dynamically similar conditions (i.e. Vmodel/Vprototype).
Find i) The maximum pressure shown by a gauge on the cooker ii) The quantity of heat transferred to the water when it just starts to boil (ignore heat capacity of cooker)
A steam turbine has extractions to provide heating steam for the feedwater heaters in a power plant. Determine the power, in MW, of the turbine.
Determine the shortest time possible for the rear wheel drive, 2 Mg truck to achieve a speed of 16 m/s with a constant acceleration starting from rest.
What is the Biot number of this cooling situation? Would lumped capacitance provide an accurate method for analyzing the cooling?
The sphere is cooled by 20oC air with a convection heat transfer coefficient of 100W/m^2*K?. What is the sphere's surface temperature?
A 10 cm x 10cm sheet of material is 2 cm thick and made of a material with a conductivity of 0.5W/m*K?. Determine temperature on the side of the sheet exposed to the heat flux.
At what true event rate will dead time losses (not to be confused with dead time) in counter B be twice as great as those for counter A?
Steam at 95 bar and 400 C is supplied in turbine. The condenser pressure is 0.035 bar. If the plant operates as a Rankine cycle, calculate Heat transferred to the condenser cooling water.
Estimate the convective heat-transfer coefficient for natural convection from a horizontal steam pipe. The outside surface temperature of the insulated pipe is 80°C.
Determine the mass flow rate of condensor cooling water, in kg/s, if the cooling water undergoes a temperature increase of 18C with negligible pressure change in passing through the condensor.
Find the velocity and acceleration of the end of the bar (point A) and the acceleration of the center of mass of the bar.
The length of the connecting rod rBCis 175 mm. Determine The angular velocity and angular acceleration of the connecting rod.
Determine (a) the enthalpy of R-134a at the exit; (b) the temperature at exit; (c) the entropy of R-134a at the exit; and (d) the entropy generation.
Determine the air velocity at the exit when the inlet velocity is very low (can be neglected) and the nozzle isentropic efficiency is 90%.
Water Steam at 3MPa and 400oC is expanded to 100kPa in an adiabatic turbine with an isentropic efficiency of 92%. Determine the power produced by this turbine in kW when the mass flow rate is 2kg/s.
The temperature of argon at the outlet is 20oC. Determine the outlet pressure of air and the specific work produced by this turbine.
Consider X = Norm(5,7), Y = Norm(5,7) and Z = Norm(1,9) and assume X,Y and Z are independent. Find and sketch the probability density function of the random variable T = X-Y+Z
Nitrogen at 900kPa and 300oC is expanded adiabatically and reversibly in a closed system to 100kPa. Determine the minimum nitrogen temperature after the expansion.
Pure ethane at 400 degrees C is fed to the reactor, which operates isothermally at 100% ethane conversion. Calculate the required heat transfer to or from the reactor (state which it is) in kJ.
As the load on the motor is increased, the developed torque increases to 50 Ib-ft. Find the armature current required to produce the increased torque.
A 230-V shunt motor develops a torque of 40 Ib-ft when the armature current is 11 A. Find the torque developed when the current increase to 22 A and the field flux remains constant.
If the maximum torsional shear stress is limited to 10KSI, determine the minimum outer radius to the neares 1/8 in. Show all steps and calculations.
A 180-lb man and a 120-lb woman stand side by side at the same end of a 300-lb boat. Determine the velocity of the boat after they have both dived, if (a) the woman dives first, (b) the man dives firs