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What do you understand by closed packed planes and closed packed direction in the arrangement of atoms? Justify their presence in many metals? State the effect of grain size on mechanical behavior o
An air conditioner can produce a 120 kJ/min cooling effect while rejecting 2.5kW of heat. What is its COP and the electricity it consumes?
An air compressor takes air in at the state of the surroundings 100 kPa, 300 K. The air exits at 400 kPa, 200°C at the rate of 2 kg/s. Determine the minimum compressor work input.
A heat pump has a coefficient of performance of 2 using a power input of 2 kW. Its low temperature is To and the high temperature is 80oC, with an ambient at To. Find the fluxes of exergy associate
The heat engine does maximum work equal to 600kJ. Determine the heat supplied to the heat engine, heat rejected to the heat sink, and the temperature of the heat sink.
If the cylinder head is milled so that the original clearance is reduced to 0.4 cm, by what percentage will the engine efficiency change if the engine retains the original stroke?
A single metallic crystal is oriented such that the normal to the slip plane and slip directions are at angles of 50 and 40 degrees respectively, with the tensile axis.
We want to achieve a concentration of 0.5%wt of carbon at a depth of 0.2 mm below the surface of the slab of a metal. The initial concentration of carbon in the metal is 0.1wt%.
Water at 10 degrees C flows throug a smooth 60-mm-diameter pipe with an average velocity of 8m/s. Would a layer of rust of height 0.005mm on the pipe wall protrude through the viscous sub layers? E
Consider a system operating a power cycle between thermal reservoirs at temperatures Th and Tc where Th>Tc. Using 1st and 2nd law of thermodynamics, derive the maximum thermal efficiency possibl
A diesel engine has a state before compression of 95 kpa, 290 k, a peak pressure of 6000 kpa, and a maximum temperature of 2400 K. Find the volumetric compression ratio and the thermal efficiency.
Heat in the amount of 100 kJ is transferred directly from a hot reservoir at 1200 K to a cold reservoir at 600 K. Calculate the entropy change of the two reservoirs and determine if the increase of
Combustion products with the molar anaylisis of 10% CO2, 20% H2O, 70% N2 enter an engine's exhaust pipe at 1000F, 1atm and are cooled as they pass through the pipe, exiting at 100F, 1atm.
If the static and kinetic friction coefficients between the incline and the spool are us= 0.43 and uk= 0.3, respectively, determine the acceleration of G, the angular acceleration of the spool, and
A 1 kg block of copper at 350°C is quenched in a 10 kg oil bath initially at ambient temperature of 20°C. Calculate the final uniform temperature (no heat transfer to/from ambient) and the
The extraction steam from the turbine enters the heater at 4 MPa, 275°C, and leaves as saturated liquid. What is the required mass flow of the extraction steam (kg/s)?
A vertical piston cylinder arrangement with a piston mass of 60 kg with a face area of 150 cm square, contains 5 grams of air. The initial volume occupied by air is 6 liters.
If a concentration of 0.00005 parts per million (ppm) exist in the water, the conctration is magnified to what concentration (ppm) in a fish-eating birds like an osprey?
Body A has a mass of 50 kg while the mass of body B is 20 kg. A force F = 500 N is applied to body A parallel to the plane. Assuming that the plane is smooth, determine the least coefficient of fri
An air-water vapor mixture enters an adiabatic saturator at 30 degree C. Determine the relative humidity and the humidity ratio of the inlet mixture.
The axial compressor has a stage temperature rise of 30K, using a 50% reaction design with a stator outlet angle of 20. If the mean diameter of each single is 25cm and each stage is identical, calcu
Find the mass flow rate for each turbine (not necassirly the same), and the rate of entropy generation in each turbine and the mixing chamber. You may assume that each turbine is adiabatic.
An axial flow compressor stage has blade root,mean and tip velocities of 150,200 and 250 m/s. The stage is to be designed for a stagnation temperature rise of 20K and axial velocity of 150 m/s, both
Initially, the rope is entirely wrapped around the cylinder and the bucket is at rest. Find a symbolic expression for the acceleration of the bucket as it falls down the well.
A ship has an engine that rotates clockwise when viewed from the front. It has an effective moment of inertia of 250 kg m2 and rotates at 400 rev/min. Calculate the magnitude and effect of the gyros