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A facility uses an 23 hp fan to blow-dry products on an conveyor belt in a plant that operates 24 hours a day, 365 days a year. For 34% of the time, the fan needs to run at full load, but for the remainder of the time the fan could run at 43% speed and meet the plant's needs. However, the plant currently runs the fan at 100% speed at all times. You recommend that the plant install a Variable Frequency Drive to allow the fan to run at the reduced speed when possible. Assume that the motor efficiency is 91.4 and the motor power factor is 0.85. Assuming that the plant pays $0.09 per kWh, and that a VFD costs $250 per hp, what is the simple payback period for this recommended change (in years)?
A sphere of radius R is uniformly charged to a total charge of Q. It is made to spin about an axis that passes through its center with an angular speed ω. Find the magnitude of the resulting magnetic field at the center of the sphere.
A resistor is in the shape of a cube, with each side of resistance R . Find the equivalent resistance between any two of its adjacent corners.
Question: Field and force with three charges? What is the electric field at the location of Q1, due to Q 2 ?
What is the maximum displacement of the bridge deck?
What is the magnitude of the current in the wire as a function of time?
Questions on blackbody, Infra-Red Detectors & Optic Lens and Digital Image.
Illustrate the cause of the components accelerating from rest down the conveyor.
Calculate the dc voltage applied to the circuit.
Quadrupole moments in the shell model
Determine the tension in each string
Calculate the smallest coefficient of static friction necessary for mass A to remain stationary.
Evaluate maximum altitude?
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