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Low level heat energy is exhausted continually to a large body of water at the rate of 22MJ/hour. Assuming the lake temperature remains constant at 290K what is the rate of entropy change expressed
Which bearing has higher starting torque, rolling element bearing or journal bearing? Justify your answer. When would you choose pressure fed journal bearings over hydrodynamic journal bearings?
A nozzle for a carbon dioxide (CO2;) fire extinguisher is based on the following inlet conditions: pressure=2500 kPa, temperature=300oK, and velocity =25 meters per second.
To improve the efficiency of a steam boiler system which generates 1000 psia steam for refinery process use, the boiler feed water (BFW) is to be preheated to 500oF from 100oF before it enters the b
For a adiabatic steam turbine, the operating conditions are as follows: Assuming a steady state, steady flow proccess. For a power output of 20 MW, what is the mass flow rate in kg/sec?
You are designing a centrifugal compressor system to compress filtered atmospheric air at 101 kPa (absolute) to 750 kPa (absolute) discharge pressure. The steady-state inlet and outlet temperatures
A paddle wheel stirs up the water, expending 40 kJ of work while the water temperature rises to 23 degrees C. Estimate: Entropy change of the surroundings
A simple steam power system has a turbine inlet state of 6.0 MPa and 540 0C and an exhaust pressure 0.008 MPa. The cooling water in the condenser experiences a temperature rise from 20 to 27 0C and
Calculate the velocity at the exit of a diffuser when air at 100kPa and 20oC enters it with a velocity of 500m/s and exit state is 200kPa and 90oC.
Materials have been used in engineering applications for thousands of years. Sometimes these engineering structures or devices fail.
Suppose that a nuclear plant generates heat in the amount of 2 x 10^7 J from its fuel rods at a temperature of 1200C and delivers it to a specialized condenser at 140C, to drive a turbine. Assuming
If I MeV of energy is deposited in an anthracene crystal and 2000 scintillation photons are produced, what is the scintillation efficiency?
The turning moment diagram for a petrol engine is drawn to the following scales : Turning moment, 1 mm = 5 N-m ; crank angle, 1 mm = 1°.
The parameter n is known to have a value of 1.1. If, after 111 s, the reaction is 50% complete how long will it take the transformation to go to 99% completion?
If ice homogeneously nucleates at -49.3oC, calculate the critical radius given values of -3.1 × 108 J/m3 and 25 × 10-3 J/m2, respectively, for the latent heat of fusion and the surface
A shaft which rotates at a constant speed of 160 r.p.m. is connected by belting to a parallel shaft 720 mm apart, which has to run at 60, 80 and 100 r.p.m.
The magnitude of heat transfer (in kW) from the condensing steam to the coolant water, assuming no heat tranfer from the condenser shell to the surrounding, is?
Estimate the wavelength corresponding to maximum emission from each of the following surfaces: the sun, a tungsten filament at 2500K, a heated metal at 1500K, human skin at 305K, and a cryogenically
A steam engine drop-valve is closed by a spring after the operation of a trip gear. The stiffness of the spring is such that a force of 4 N is required per mm of compression.
An adiabotic nozzle handling air (ideal gas with constant specific heats) has operating conditions. What is the mass flow rate at the inlet section in kg/sec?
A piston-cylinder device contains steam initially at 1 MPa, 450°C, and 2.5 m3. Steam is allowed to cool at constant pressure until it first starts condensing.
The refrigerator is located in a room that is maintained at a constant temperature of 25 degrees celsius. What is the minimum amount of work required to achieve water cooling (in kj)?
Bereken de maximale verplaatsing f (mm) die is toegestaan op een pakket van drie veren. De E-modulus bedraagt E = 210 GPa. Beschouw drie bladveren met elk een breedte b=40 mm en een hoogte h=10 mm.
The mountings to be used each have stiffness 1000 N/m and damping 25 Ns/m. What is the lowest number of units needed?
Consider the heating of an incompressible fluid with velocity Um inside a thin - walled tube. The diameter of the tube is D. Heating is in the hydrodynamically and thermally developed region and the