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A 5-m x 6-m x 8-m room is to be heated by an electric resistance heater placed in a short duct in the room. Initially, the room is at 15°C, and the local atmospheric pressure is 98 kPa. The room is losing heat steadily to the outside at a rate of 200 kJ/min. A 200-W fan circulates the air steadily through the duct and the electric heater at an average mass flow rate of 50 kg/min. The duct can be assumed to be adiabatic, and there is no air leaking in or out of the room. If it takes 15 min for the room air to reach an average temperature of 25°C, find (a) the power rating of the electric heater and (b) the temperature rise that the air experiences each time it passes through the heater.
draw the shear and bending-moment diagrams for the beam and loading shown and determine the maximum normal stress due to bending.
A 10 kW electric heater is used to heat 2 kg of air contained in an insulated rigid tank from 400 kPa and 50 °C to 200 °C. The ambient air temperature and pressure is 20 °C and 100 kPa, respectively.
Questions set on Entropy, Exergy, Cycles, Otto Cycle, Rankine Cycle. In a coal fired thermal power station, indicate where the exergy contained in the coal is destroyed. For each exergy destruction mechanism, explain whether there is a small..
what is the effect of quenching on the transition temperature and toughness for the mild steel ?
a truck travelling along a straight road at speed 20 km/hr increases its speed to 120 hr/hr in time 15 sec.If its acceleration is constant, determine the distance traveled.
The compression ratio of an air-standard Otto cycle is 9.5. Prior to the isentropic compression process, the air is at 100 kPa, 17 C, and 600 cm2
Describe the principle and operation of an hearth furnace. Possible references: Making and Shaping of Steels by the American Society of Metals and Google resources.
Calculate the pressure of 15.0g of methane gas in a 1.50L vessel at 45.0 degrees C using (a) the Ideal Gas Law and (b) the van der Walls equation using the following information about the constants, a and b: a = 2.253 and b = 0.04278.
Determine the minimum coefficient of static friction between the crate and the truck so that the crate does not slide relative to the truck.
Determine the mass fractions of alpha and beta phases, Determine the mass fractions of primary beta and eutectic microconstituents, Determine the mass fraction of eutectic beta
Fluid/Dam Pressure, Compare the pressure force exerted on the face of two dams that hold a fresh water of 1000 Kg/m^3 density and a salty water of 1030 Kg/m^3
Construct a suitable finite element model and compare the FEA predictions with the theoretical data and produce a graph to show the stress distribution
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