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Problem 1:
Heat is transferred steadily through a 0.2-m thick, 8m x 2 m wall at a rate of 2.6 kW. The inner and outer surface temperatures of the wall are 15 °C and 5 °C respectively. Find the average thermal conductivity of the wall.
Problem 2:
Consider a refrigerator that consumes 350 W of electric power when it is running. If the refrigerator runs only one quarter of the time and the unit cost of electricity is $0.19/kWh, find the electricity cost of the refrigerator over a 30 day month.
Problem 3:
The elevator of a large building is designed to raise a net mass of 4,000 kg at a constant speed of 12 m/s using an electric motor. Find the minimum power rating of the motor in kW.
steam at 140 lbfin2 1000degf enters an insulated turbine operating at steady state with a mass flow rate of 3.24 lbs
A small scale hydraulic power system has an elevation difference between the reservoir water surface and pond surface temperature downstream of turbine is 10m. The flow rate through the turbine is 1m^3/s. The turbine efficiency is 83%. Determine t..
a cannon-ball of 5 kg acts as a piston in a cylinder of 0.15 m diameter. as the gun-powder is burned a pressure of 7
Consider a power plant operating on an ideal Rankine cycle without feed water heating. Steam enters the turbine saturated at 1000F at the rate of 5 x10 lbm/H. The turbine exhausts to a surface condenser at 1 psia. The condenser has an overall heat tr..
Design a mask set and process flow that would produce a 50000 Ohm resistor patterned onto the surface of an initially n type silicon wafer (0.18 Ohm-cm, phosphorous doped).
water at 15 degrees celcius flows through a nozzle that contracts from a diameter of 20cm to 2cm. the pressure at
Determine the factor of safety against net section yield in the presence of the crack and determine the factor of safety against brittle fracture for the same conditions.
A structural steel with a fracture toughness of 60 MPa(m^1/2) has no surface crack larger than 3.5 mm in length. By how much (in %) would this largest surface crack have to grow before the system would experience fast fracture under an applied stress..
a turbine takes in 2 kgs neon at 27 degc and 200kpa with negligible velocity. the produced work is 75 kw and 30 kw of
Air enters a gas turbine of an air-standard Brayton cycle at 1000 kPa, 1000 K, and expands to 100 kPa in two stages. The air is reheated between the stages at a constant pressure of 400 kPa to 1000 K. The compressor work input is given as 250 kJ/kg.
determine the maximum velocity to which water can be accelerated by the nozzles before striking the turbine blades.
hot exhaust gases are used to heat water at 100kpa and 15 degree c to produce saturated water vapor at 200 degree c
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