What do you understand by closed packed planes
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 of metal?
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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 associated with the energy fluxes in and out.
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.
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?
A pendulum bob of mass 'm' is hung from a light string,the bob then moves in a horizontal circle of radius 'r' and the string makes an angle alpha with the vertical. If the angular velocity of the bob is 'w' and 'g' is the acceleration due to grav
Ultraviolet light with a wavelength of 60nm shines on a gas of hydrogen atoms in their ground states. Some of the atoms are ionised by the light. What is the kinetic energy of the freed electrons in this process?
It is known that the compressor consumes 1.2kW of electricity at this operating condition. Determine 1) heat rejection rate to the surrounding; 2) cooling rate; and 3) the COP of the refrigerator?
An air compressor receives atmospheric air at T0 = 17°C, 100 kPa, and compresses it up to 1400 kPa. The compressor has an isentropic efficiency of 88% and it loses energy by heat transfer to the atmosphere as 10% of the isentropic work.
Air at 20 degree C, 40% RH is mixed adiabatically with air at 40 degree C, 40% RH in the ratio of 1 kg of the former to 2 kg of the latter on a dry basis.
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