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q determine the synchronous speed in revolutions per minute and the useful torque in newton- meters of a 200-hp 60-hz six-pole synchronous motor
q a wye-connected three-phase 50-hz six-pole synchronous alternator develops a voltage of 1000 v rms between the lines when the rotor dc field
q the flux-density distribution in the air gap of a 60-hz two-pole salient-pole machine is sinusoidal having an amplitude of 06 tcalculate the
q the flux-density distribution produced in a two - pole synchronous generator by an acexcited field winding isbtheta t bm sin omega1t cos thetafind
q a sectional view of a cylindrical iron-clad plunger magnet is shown in figure the small air gap between the sides of the plunger and the iron shell
q a 100-turn coil in the configuration of is rotated at a constant speed of 1200 rmin in a magnetic field the rms induced voltage across the coil is
q the machine of problem can be used as a motor let the terminals of the coil be connected to a voltage source of 1 kv rms if the motor runs at 1800
q a show by applying amperes circuital law that themagnetic field associated with a long straight current-carrying wire is given by bphi micro0i2pir
q 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 respectively the total
q a 10-kw 250-v dc shunt generator having an armature resistance of 01and a field resistance of 250 delivers full load at rated voltage and 800 rmin
q a 230-vdc shuntmotor delivers 30 hp at the shaft at 1120 rmin if the motor has an efficiency of 87 at this load finda the total input powerb the
q 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 of 325 a the total
q a 100-kw 230-v dc shunt generator with ra 005 and rf 575 has no-load rotational loss friction windage and core loss of 18 kw computea the
q a separately excited dc generator with an armature-circuit resistance ra is operating at a terminal voltage vt while delivering an armature current
q the external - characteristics data of two shunt generators in parallel are given as followsload current a 0 5 10 15 20 25 30terminal voltage i v
q three dc generators are operating in parallel with excitations such that their external characteristics are almost straight lines over the working
q two shunt generators operate in parallel to supply a total load current of 3000 a each machine has an armature resistance of 005and a field
q a 75-hp 250-v 1800-rmin shuntmotor having a full-load line current of 26 a is started with a four-point starter the resistance of the armature
q a dc series motor operates at 750 rmin with a line current of 100 a from the 250-v mains its armature-circuit resistance is 015 and
q the magnetization curve taken at 1000 rmin on a 200-v dc series motor has the following datafield current a 5 10 15 20 25 30voltage a 80 160 202
q a 10-kw 230-v shunt generator with an armature-circuit resistance of 01 and a field- circuit resistance of 230 delivers full load at rated
q a 50-kw 250-v short-shunt compound generator has the following data ra 006 rs 004 and rf 125 calculate the inducedarmature voltage at rated
q a50-kw 230-vcompound generator has the following data armature-circuit resistance 005 series-field circuit resistance 005 and shunt- field
a dc series motor is connected to a load the torque varies as the square of the speedwith the diverter-circuit open the motor takes 20 a and runs at
q a20-hp 250-vshuntmotor has a total armature - circuit resistance of 025 and a field-circuit resistance of 200at no load and rated voltage the