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The surface of the apple is 8.4 degrees C. What is the heat transfer coefficient of the apple? Also, calculate the thermal diffusivity and thermal conductivity.
If only one extraction from the turbine occurs at 10 bar, what percentage of the total flow to the turbine is ideally extracted? Calculate the amount by which the turbine work is changed.
The appropriate pumps are used for the water leaving the condenser and the feed water heater. Calculate the cycle thermal efficiency and the net work per kg of steam.
It is then reheated to 400oC and is then expanded to 10 kPa in the low pressure turbine. Calculate the cycle thermal efficiency and the moisture content leaving the low pressure turbine.
A steam power plant utilizing the Rankine cycle has the following particulars. Determine the power in kW and the thermal efficiency of the plant.
The gas is considered an ideal gas with Cp=5.832 kJ/kg.K. Find the final temperature T2 and work done by the Compressor.
What is the work done on the R-134a? Have you made any assumption? Explain. What is the entropy change in this operation?
What is the work done for 1kg of air? If it is expanded isentropically. What is the pressure of the air leaving the turbine?
The downstream pressure (6-in. pipe) is 40 psi when the flow of water is 3.92 ft^3/s. What horsepower is delivered by the pump to the flow?
What is the ratio of the dynamic viscosity of air to that of water at standard pressure and temperature of 20°C? What is the ratio of kinematic viscosity of air to that of water for the same co
What horsepower must be supplied to a pump that operates at an efficiency of 75% to the flow if water (T=25°C) is pumped through the 25-cm wrought iron steel pipe.
The entrance and exit pipes are identical, D1=D2=60 mm, and both carry 0.08m^3/second. Determine the scale reading W. This is application of the momentum equation.
Find the flow rate at which water is being discharged from the pipe. Neglect minor losses but assume resistance coefficient ƒ=0.0162.
If the discharge from the turbine is 250 cubic feet per second, what power output may be expected from the turbine?
The depth of cut is set to 0.025in and the power feed is set to 0.012in/rev. Calculate the material removal rate and the estimated horsepower requirment. Estimate the tool force.
The inlet area of the turbine is 125 cm^2. Determine (a) the mass flow rate of the steam, and (b) the power output (c) the exit area.
Refrigerant-134a is gaining heat at a rate of 4 kw/s as it passes trough the diffuser. Determine the mass flow rate of the refrigerant.
Initially the nitrogen is at 110kPa and 25 celcius and then it is compressed slowly in a polytropic process during which PV^1.2=constant until the volume is reduced by one-half. Determine the work d
Determine the thermal efficiency of a heat engine that receives 660kJ of heat from a source at 217 Celcius and produces 280 kJ of net work while rejecting the waste heat to a sink at 27 Celcius.
Determine the wall thickness of the hollow square rod for which the rods have the same cross-sectional area. (b) Using E = 15 x 10^6 psi, determine the critical buckling load of each rod.
Superheated water vapor enters a well-insulated throttling valve at p1 = 1 atm and t1 = 600°F. Determine the entropy production in the valve, in Btu/lb·°R.
What should be the sound pressure levels in dB of low frequency speaker at 50Hz and of medium frequency speaker at 1000Hz respectively? What is the combined sound pressure level of all three speaker
An insulated rigid tank is divided into two chambers by a membrane. Determine the total entropy production (Btu/R).
Superheated vapor enters the turbine at 480°C and 100 bar and exits at 0.06 bar. The turbine has an isentropic efficiency of 80%. Determine the actual turbine work, in kJ/kg.
If the house is losing heat at a rate of 20 kJ/s, determine the minimum rate of heat supply to the heat engine required to keep the house at 22C.