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a pmdc mator connected to 48 v supply runs on no-load at 2000 rmp drawing 12 a it is found to have an armature
the magnetization curve of a 4-pole dc series motor with a 2-circuit winding was obtained by separately exciting the
a 400 v dc shunt motor takes a current of 56 a on no-load and 683 a on full-load the load current weakens the field by
for the hoist drive system shown in fig p739a calculate the minimum size of the motorb if the line voltage drops to 180
a dc shunt machine has an open-circuit voltage of 220 v at 1200 rpm the armature resistance is 02 w and field
1 the open-circuit voltage of a dc shunt generator is 130 v when loaded the voltage drops to 124 v determine the load
1 a 480 v 20 kw shunt motor took 25 a when running light taking the arma ture resistance to be 06 omega field
the following test results were obtained while hopkinsons test was performed on two similar dc shunt machines supply
the hopkinsons test was performed at full load on two similar shunt machines the test results areline voltage 110
calculate the efficiency of a 500 v shunt motor when taking 700 a from the following data taken when the motor was hot
a reparality excited dc generator has occ data at 1200 rmp as belowat if 6 a when loaded at ia 50 a it has a terminal
discuss the problem posed in prob 85 by using the circuit model of the motorprob 85a synchronous motor is drawing power
1 write the expression relating the electrical power converted to the mechanical form in a dc motor how are the
1 state the types of dc motors what is the basis of the classification2 based on emf and torque equation compare and
1 explain how the back emf of a motor causes the development of mechanical power2 sketch the speed-torque
1 design a suitable double-layer lap winding for a 6-pole armature with 18 slots and two coil-sides per slot give the
a 6-pole dc armature with 36 slot and 2 coilsides per slot is to be wave-wound doublelayer calculated the back-pitch
1 explain the meaning and significance of the critical field resistance of a shunt generator2 each commutator segment
1 what is the effect of magnetic saturation on the external characteristics of a dc shunt generator2 discuss that emf
1 explain through sketch and derivations the speed-torque characteristic of a differentially compound dc motor2 advance
1 why do we need a compensating winding to nearly over come the armature reaction and how is this winding excited and
1 by what test on dc reparalely excited generator would you determine the armature reaction equivalent field current at
1 what is te significance of a winding diagram2 when do you use concentric winding3 what are the advantages of
a synchronous generator having a synchronous reactance of 10 pu is connected to in- finite bus-bars of 10 pu voltage
consider the synchronous generator-motor set of ex 87 whose data are repeated belowa the set is operating at rated