In April 2025
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Ans:(4Mf
Two steel rings of radial thickness 30 mm, common radius 70 mm and length 40 mm are
shrunk together to form a compound ring. It is found that the axial force required to separate
the rings, i.e. to push the inside ring out, is 150 kN. Determine the shrinkage pressure at the
mating surfaces and the shrinkage allowance. E = 208 GN/mZ. The coefficient of friction
between the junction surfaces of the two rings is 0.15.
A thick cylinder of 100 mm external diameter and 50 mm internal diameter is wound with
steel wire of 1 mm diameter, initially stressed to 20 MN/m’ until the outside diameter is
120 mm. Determine the maximum hoop stress set up in the cylinder if an internal pressure of
30 MN/m’ is now applied.
inlet and outlet conditions of air are C1 = 12 m/s, p1 = 1 bar, v1 = 0.5 m3/kg and C2 = 90 m/s,
p2 = 8 bar, v2 = 0.14 m3/kg. The increase in enthalpy of air passing through the compressor is
150 kJ/kg and heat loss to the surroundings is 700 kJ/min.
Find : (i) Motor power required to drive the compressor ;
(ii) Ratio of inlet to outlet pipe diameter.
Assume that inlet and discharge lines are at the same level.
air compressor. It enters the compressor at 6 m/s with a pressure of 1 bar and a specific volume
of 0.85 m3/kg and leaves at 5 m/s with a pressure of 7 bar and a specific volume of 0.16 m3/kg. The
internal energy of the air leaving is 90 kJ/kg greater than that of the air entering. Cooling water
in a jacket surrounding the cylinder absorbs heat from the air at the rate of 60 kJ/s. Calculate :
(i) The power required to drive the compressor ;
(ii) The inlet and output pipe cross-sectional areas
A thermodynamic steady flow system receives 4.56 kg per min of a fluid where p1 = 137.90 kPa, = 0.0388 m3/kg, v1 = 122 m/s, and u1 = 17.16 kJ/kg. The fluid leaves the system at a boundary where p2 = 551.6 kPa, = 0.193 m3/kg, v2 = 183 m/s and u2 = 52.80 kJ/kg. During the passage through the system the fluid receives 3,000 J/s of heat. Determine the work.
W = ____ kJ/min
Answer in 1 decimal place
A house is to be heated by hot water that receives heat from a furnace. Air with an enthalpy of 305 kJ/kg and fuel with an enthalpy of 45360 kJ/kg enters the furnace and the gases leaving have an enthalpy of 608 kJ/kg. There are 17 kg-air per kg-fuel and the water for heating receives 18.3 kW of heat by circulating through the furnace. What is the fuel consumption in kg/hr?
mf = _____ kg/hr
answer in 3 decimal places
Steam enters a turbine stage with an enthalpy of 3620 kJ/kg at 75 m/s and leaves the same stage with an enthalpy of 2800 kJ/kg at 128 m/s. Calculate the work done by steam.
W = ____ kJ/kg
Answer in 2 decimal places
