Search & Filtering
Oxygen at 5 bar and 320 K is supplied to an insulated tank of volume 5
m3
. The tank initially contains oxygen at 1 bar and 300 K. Determine:
i) the final temperature in the tank when its pressure reaches 5 bar.
ii) the mass that has entered the tank.
5 kg of air initially at 8 bar and 380 K expands polytropically (pv1.2 =
constant) until the pressure is reduced to one-fifth value. Calculate: (i)
Final specific volume and temperature .
(ii) Change of internal energy, work done and heat interaction .
Take: R = 0.287 kJ/kg K and γ= 1.4.
A rigid cylinder containing 0.01 m3 of carbon dioxide at 1 bar and 300 K
is heated until temperature becomes 400 K. Determine: The heat
supplied.
4 m3 of air at 2 bar, 27°C is compressed up to 6 bar pressure following
pv1.2 = constant. It is subsequently expanded adiabatically to 2 bar.
Considering the two processes to be reversible, determine the net work.
Nitrogen at 25 C and 1.5 bar is contained in a vessel of 0.05 m3
. The
gas is heated at constant volume until the pressure is 4.5 bar, and then
cooled at constant pressure back to original temperature. Calculate the
net heat flow from the air.
the energy transforms from one to another use dis words to describe it
mass energy equivalence,fusion,four protons,alpha particle, helium,gamma ray,visible light,solar iiadiance of 1370 wm2
A refrigerator working on reversed Carnot cycle requires 0.5 KW
per KW of cooling to maintain a temperature of -15°C. Determine the
following:
a) COP of the refrigerator
b) Temperature at which heat is rejected and
c) Amount of heat rejected to the surroundings per KW of cooling.
A reversible heat engine takes heat from a source at temperature T1 then
rejects it to heat sink at temperature T3. The engine drives a reversible
refrigerator which absorbs heat from a tank at temperature T2 and rejects
heat to the same sink reservoir at temperature T3. If T1 = 1000 K and T2
= 330 K, determine: (i) The temperature T3 such that heat supplied to
engine Q1 is equal to the heat absorbed by refrigerator Q2. (ii) The
efficiency of the heat engine and C.O.P. of the refrigerator.
- At temperature T, the internal energy of 1mol rigid diatomic molecules is =.........?
A monochromatic light illuminates the surface of sodium and the maximum kinetic energy of a photoelectron is 1.2eV.The cutoff wavelength of sodium is 540nm, the wavelength of the incident light is.........
