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a solution of organic colloids in water is to be concentrated from 8 to 45 percent solids in a single-effect evaporator
a three-phase 50-hz induction motor has a full load speed of 700 r min and a no-load speed of 740 rmina how many poles
for this assignment you are to choose three of the five questions below and provide a comprehensive response to each
a 230-v single-phase 60-hz source supplies two loads in parallel one draws 10 kva at a lagging power factor of 080 and
a transformer has its maximum efficiency of 09800 when it delivers 15 kva at unity power factor during the day it is
the following data were obtained on a 25- kva 2400240-v 60-hz single-phase distribution transformerbull open-circuit
a 25-kva 2200220-v 60-hz single-phase transformer has an equivalent series impedance of 35 j40 referred to the primary
a 25-kva 2400240-v 60-hz single-phase transformer has an equivalent series impedance of 345 j575 omega referred to the
a single-phase 3-kva 220110-v 60-hz transformer has a high-voltage winding resistance of 03 omega a low-voltage winding
from the magnetic material characteristics shown in figure 1112 estimate the relative permeability micror at a flux
the total core loss for a specimen of magnetic sheet steel is found to be 1800 w at 60 hz when the supply frequency is
consider the magnetic circuit shown in figure p1127 assume the relative permeability of the magnetic material to be
a toroid with a circular cross section is shown in figure p1123 it is made from cast steel with a relative permeability
ac measurements with constant voltage amplitude reveal that the total core loss of a certain magnetic circuit is 10 w
in the magnetic circuit shown in figure p1128 the center leg has the same cross-sectional area as each of the outer
a two-pole rotating machine with a singly excited magnetic field system as its stator and a rotor that carries no coil
a 10-turn square coil of side 200 mm is mounted on a cylinder 200 mm in diameter if the cylinder rotates at 1800 rmin
determine the synchronous speed in revolutions per minute and the useful torque in new ton meters of a 200-hp 60-hz
a six-pole double-layer dc armature winding in 28 slots has five turns per coil if the field flux is 0025 wb per pole
a four-pole dc series motor has a lap-connected two-layer armature winding with a total of 400 conductors calculate the
in problem 1241 neglect the saturation of the core leakage and fringing neglect also the reluctance of the
for the electromagnet shown in figure p1243 the lambda-i relationship for the normal working range is given by i
a solenoid of cylindrical geometry is shown in figure p1244a if the exciting coil carries a steady direct current i
figure e1211 can also be considered as a simple model of a magnetically operated relay that is commonly used for the
a sectional view of a cylindrical iron-clad plunger magnet is shown in figure p1218 the small air gap between the sides