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Continuous cable ADB runs over a small frictionless pulley at D to support beam OABC which is
part of an entrance canopy for a building (see figure 3). A downward distributed load with peak
intensity q0 = 5 kN/m at O acts on the beam. Assume that canopy weight W = 8 kN and that cable
cross-sectional area is 100 mm2
.
a) Find cable force T and pin support reactions at O and D
b) Find the normal stress in the cable in the cable ADB
c) Determine the required diameter of pins A, B, D and O if the pins are in double shear and
the allowable shear stress is 80 MPa? Note that OA = AB = BC = 1.5m.
A continuous cable (diameter 6 mm) with tension force T is attached to a horizontal frame member
at B and C to support a sign structure, Fig. 1. The cable passes over a small pulley at D. The wire
is made of a copper alloy, and the stress-strain relationship for the wire is
(a) Find the axial normal strain in the cable and its elongation due to the load W = 6.8 kN
(b) If the forces are removed, what is the permanent set of the cable.
Hint: Start with constructing the stress-strain diagram and determine the modulus of elasticity, E
and the 0.2% offset yield stress.
01) An inventor claims to have developed a heat engine that receives 700Kj of heat from a source at 500K and produces 300Kj of net work while rejecting the waste heat to a sink at 290K. is this reasonable claim?
01) Refrigerant – R134a enters an adiabatic compressor as saturated vapor at 120kPa at a rate of 0.3m3/min and exits at 1MPa pressure. If the isentropic efficiency of the compressor is 80 percent, determine
a) The temperature of the refrigerant at the exit of the compressor
b) The power input, in kW. Also show the process on a T- s diagram with respect to the satuaration lines.
01) Steam enters an adiabatic turbine at 8MPa and 5000C with a mass flow rate 3kg/s and leaves at 30kPa. The isentropic efficiency of the turbine is 0.90. neglecting the kinetic energy of the steam, determine
a) The temperature at the turbine exit
b) The power output of the turbine
Air is a cylindrical is compressed reversible and isothermallay from 95 kPa , 25°C to 290 kPa. The initial volume is 0.162m³. Determine the work input, heat transfer and the entropy Change of the air being compressed
An air-conditioning system operating on the reversed Carnot cycle is
required to transfer heat from a house at a rate of 750 kJ/min to
maintain its temperature at 24°C. If the outdoor air temperature is
35°C, determine the power required to operate this air-conditioning
system.
An inventor claims to have developed a heat engine that receives 700 kJ of heat from a source at 500 K and produces 300 I of net work. while rejecting the waste heat to a sink at 290 K. Is this reasonable claim?
Determine the COP of a heat pump that supplies energy to a house at a rate of 8000 kJ/h for each kW of electric power it draws. Also, determine the rate of energy absorption from the outdoor air.
An air conditioner removes heat steadily from a house at a rate of 750 kJ/min while drawing electric power at a rate of 6 kW. Determine (a) the COP of this air conditioner and (b) the rate of heat transfer to the outside air.
