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A motor-driven centrifugal pump is operating with the following parameters: speed = 1,800 rpm, motor current = 40 amps, pump head = 20 psid, pump flow rate = 400 gpm. What is the pump head and motor current if the pump speed decreases to 1,200 rpm?
a prototype 90 degree pipe elbow has ethyl alcohol at 20 degrees celsius flowing through it. the pressure drop through
a thin-walled cylindrical pressure vessel of inner radius 30 mm wall thickness 3 mm and closed ends is subjected to an
a boom for a crane is shown in the horizontal position. if w1kn determine the force for supporting memebers ac ab ad
sandbag is released from hot air balloon at an altitude of 1312ft. the net effect of gravity and aerodynamic friction
a velocity field is described by the equation given below with a 3 m2 s2 and b 4 m3. determine the equation of the
one pound of nitrogen as an ideal gas expands isothermally at 70degf from a volume of 1 ft3 to a volume of 2 ft3.
Refrigerant-134a flows across a 3 m-long plate which imparts a constant heat flux of 50 kW/m2 to the refrigerant. If the refrigerant is at -40 C and is flowing at 1 m/s, determine the following: (a) The average heat transfer coefficient along the len..
based on observations the speed of a jogger can be approximated problems 617 by the relation v 5 7.51 2 0.04x0.3 where
a cylinder of compacted scrap metal measuring 2 m in length and 0.5 in diameter suspended from a spring scale at a
you balanced a pump impeller by placing a 5 gram weight at a radius of 100 mm. the original vibration amplitude was 10
A balanced-cross-flow compact heat exchanger is required for an air heating system that processes 0.5 kg/s air. The inlet temperature for the hot water is 295 K, and the cold air enters at 270 K to be heated to 287 K. The inlet pressure for the hot w..
a piston cylinder device contains 0.25 kg of air initially at 1.8 mpa and 360 degc. the air is first expanded
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