Chapter 7, Problem 7.39P

Q3. A storage tank is filled with water from a river by using a pump at a rate of 100 L/s, as shown in the below figure. Storage tank 15 m Pump The motor is operated at an energy consumption of 250V and 80 amp with the shift rotating speed of 950 RPM at a torque of 8.5 N.m. By ignoring the changes in the kinetic energy and the frictional losses in the pipe, Calculate the following: a) pump-motor unit efficiency. b) motor efficiency. c) difference in pressure between the inlet and the exit of the pump

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A turbine extracts water from a 25 m high reservoir, if the flowrequirement is 10000 m3/hr, what is the generated power in kW ifthe efficiency is 75%?

A pump has a displacement of 95 cm³/rev, rotates at 1160 rpm, and produces an outlet pressure of 3450 kPa. If the volumetric efficiency of the pump is 92% find the actual hydraulic power (in kW) produced by the pump.

FIND THE PERCENT SLIP OF A RECIPROCATING PUMP IF THE VOLUMETRIC EFFICIENCY IS 96%.

Question. A boiler unit has forced draught fan maintaining draught of 90 mm of water column while discharging 38 m/s through outlet section of 1.9m² area. Ambient temperature is 300 K and assume mass of 1 m³ of air at NTP as 1.293 kg to find out power of motor of forced draught fan if for efficiency is 80%. Determine the power consumption if FD fan is substituted by ID fan of similar efficiency considering flue gas temperature of 450 K

A 650 bhp Diesel Engine with 6 cylinders has a brake thermal efficiency of 36 % and a jacketwater loss of 27%. It uses a closed cooling system with a cooling tower 10 meters high. Thetemperature rise after passing the water jacket is 12 °C and the cooling tower range is 5 °C. Make asketch showing the vital parts of the cooling tower system and calculate:a) capacity of the jacket water pump in GPMb) exhaust loss if the friction, radiation and other losses total 8%.c) cooling water flow rate in the cooling tower in liter/hrd) standard size electric motor to drive the raw water pump if the total dynamic head is 35 meters and the pump efficiency is 84%

A fountain and a water tank will be powered by water from a nearby lake. The elevations and pipe connections are depicted in the diagram below. The fountain's jet water should reach a height of at least 2.5 m from the nozzle outlet. The tank, on the other hand, is elevated to allow gravity to distribute water. The table below contains the specifications for nozzles, suction and discharge pipes. What is the minimum power input to the pump in kW, assuming negligible minor head losses? Assume that the pump efficiency is 88 percent and the motor efficiency is 95 percent. The fountain's water is returned to the lake via a drainage system.

c) A pump increases the pressure from 10 kPa to 70 kPa. Determine the power input required, to pump 2 m/s of water, given the inlet temperature of 15 °C. Does the inlet temperature have any significant effect on the required power?