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A three-phase ac motor, used to drive a draft fan, is connected to a 60-Hz voltage supply. At no load, the speed is 1188 r/min; at full load, the speed drops to 1128 r/min.
(a) Determine the number of poles of this ac motor.
(b) Comment on whether this motor is an induction motor or a synchronous motor.
Chemical X costs $0.09 per pound. Chemical Y costs $0.04 per pound. Chemical Z sells for $0.80 per pound. If one-half of the selling price for chemical Z is due to costs other than for raw materials, what is the maximum profit obtainable per pound..
What is Pmax (the theoretical steady-state limit of a lossless line), which is the maximum power that the line can deliver?
Wet air containing 4.0mole% water vapor is passed through a column of calcium chloride pellets. The pellets adsorb 97.0% of the water and none of the other constituents of the air. The column packing was initially dry and had a mass of 3.40kg, fol..
What is the rationale for claiming that the presence of a low temperature loss peak is a necessary and sufficient condition for good room-temperature impact strength
U-235 undergoes many different fission reactions. For one such reaction, when U-235 is struck with a neutron, Ce-144 and Sr-90 are produced along with some neutrons and electrons.
The core loss at rated voltage is 45 W, and the copper loss at rated load is 100 W. Neglect the exciting current of the transformer. Find the per-unit voltage regulation when the transformer is supplying full load at 110 V and 0.9 lagging power fa..
The efficiency of a 400-kVA, single-phase, 60-Hz transformer is 98.77% when delivering full-load current at 0.8 power factor, and 99.13% with half rated current at unity power factor.
In terms of heat treatment and the development of microstructure, what are two major limitations of the iron-iron carbide phase diagram?
A hot water heater measures 20" in diameter. What is the area of a metal base for the water heater, assuming a four-inch overhang for the base beyond the edge of the heater? (Round to the nearest tenth.)
For a Thermo-Finnigan LTQ-FT running Xcalibur 2.0.1 how can you automate 10 MS3 experiments where only the activation time is changed?
Assuming that the maximum-speed condition determines the machine size, and neglecting exciting current, losses, and voltage drops in the induction machine,
An alternative process for converting benzene to cyclohexane also uses a supported noble metal catalyst, but carries out the reaction in the liquid phase, at a temperature of 160 °C and pressure of 100 bare, in a slurry reactor.
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