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a four-pole dc machine with 728 active conductors and 30 m wb flux per pole runs at 1800 rmina if the armature winding
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
two coupled synchronous machines are used as a motor-generator set to link a 25-hz system to a 60-hz system find the
from a three-phase 60-hz system through a motor-generator set consisting of two directly coupled synchronous machines
determine the synchronous speed in revolutions per minute and the useful torque in new ton meters of a 200-hp 60-hz
a show by applying amperes circuital law that the magnetic field associated with a long straight current-carrying wire
a coil is formed by connecting 15 conducting loops or turns in series each loop has length l 25 m and width w 10 cm
a rectangular loop is placed in the field of an in- finitely long straight conductor carrying a current of i amperes as
the machine of problem 1214 can be used as a motor let the terminals of the coil be connected to a voltage source of 1
figure e1211 can also be considered as a simple model of a magnetically operated relay that is commonly used for the
a 100-kw 230-v dc shunt generator with ra 005 omega and rf 575 omega has no-load rotational loss friction wind age
a 10-kw 250-v dc shunt generator having an armature resistance of 01 omega and a field resistance of 250 omega delivers
a 230-v dc shunt motor delivers 30 hp at the shaft at 1120 rmin if the motor has an efficiency of 87 at this load finda
a dc series motor with a design constant ka 40 and flux per pole of 4615 mwb operates at 200 v while taking a current
a 10-hp 230-v dc shunt motor takes a full load line current of 40 a the armature and field resistances are 025 and 230
a sectional view of a cylindrical iron-clad plunger magnet is shown in figure p1218 the small air gap between the sides
a 100-turn coil in the configuration of figure p1213 is rotated at a constant speed of 1200 rmin in a magnetic field
the 50-turn coil in the configuration of figure p1213 is rotated at a constant speed of 300 rmin the axis of rotation
the coil is placed so that its axis of revolution is perpendicular to a uniform field as shown in figure p12110 if the
an elementary two-pole single-phase synchronous machine as illustrated in figure p1221 has a field winding on its rotor
the flux-density distribution in the air gap of a 60-hz two-pole salient-pole machine is sinusoidal having an amplitude
consider an elementary three-phase four-pole alternator with a wye-connected armature winding consisting of full-pitch
a wye-connected three-phase 50-hz six-pole synchronous alternator develops a voltage of 1000 v rms between the lines
two identical three-phase 33-kv wye connected synchronous generators operating in parallel share equally a total load
a separately excited dc generator with an armature-circuit resistance ra is operating at a terminal voltage vt while