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A 3-phase 400 V 50 Hz 6 pole cage induction motor of rating 20 kW, with slip at rated load of 4% has a starting toque equal to 120% of the rated torque. It is coupled to a pump through a reduction gear box of 2: 1 ratio of efficiency 85%. The breakaway torque is 24 N.m at the motor shaft. Assume that the torque available for acceleration remains constant for the entire duration and the motor accelerates to rated speed in 6 seconds. What are the values of rated torque and starting torque of the motor? What is the torque available for acceleration? What is the rated speed of the motor? What is the total moment of inertia of the rotating parts of the system (seen at the motor shaft)?
Cooling/Dehumidification of an air stream, A 1000 m3/minute air stream at atmospheric pressure is at a temperature of 82.2oC and a humidity of 60%. We want to cool the air + water vapor to 8.9oC to condense the water vapor.
a rankine cycle is to drive an electric generator to produce 600 mw of electricity. the generator is 95 efficient.the
carousle conveyors are used for storage and order picking for small parts.the conveyors rotate clockwise or counter
consider a coal-fired steam power plant that produces 350 mw of electric power. the power plant operates on a simple
A state runs a lottery in which 6 numbers are randomly selected from 40, without replacement. A player chooses 6 numbers before the state's sample is selected.
saturated water vapor at 200 kpa is in a constant pressure pistoncylind assembly. at this state the piston is 0.1m from
the inside surface of an 8-in-thick common brick wall is maintained at 100 f. thermal conductivity of th brick is 1.0
determine the actual and minimum theoretical operating costs, each in $/day.
there is flow between two plates as shown in the schematic. the bottom plate is stationary. the top plate is moving at
compute the torsional shear stress in a hallow shaft with an outside diameter of 40 mm and an inside diameter of 30 mm
Design the pump power and the diameter of brunching pipes D1, D2, D3, so that the flow rate coming into all buildings are Q1=Q2=Q3=4.5m^3/hr, when all four valves v, V1, V2, V3 are open.
a 20 mw radial flow hydraulic turbine is to be designed with a head of 70 m and a speed of 90 rpm. a geometrically
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