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dc motor startingwhen voltage is applied to the armature of a dcmotorwith the rotor stationary no emf is generated and the armature current is
q show process of speed control of dc motorsequation showed that the speed of a dc motor can be varied by control of the field flux the armature
a 200-v dc shunt motor has a field resistance of 200 and an armature resistance of 05 on no load the machine operates with full field flux at a
q explain about direct-current machinesgenerally speaking conventional dc generators are becoming obsolete and increasingly often are being replaced
q show applications for synchronous motorswith constant-speed operation power factor control and high operating efficiency three-phase synchronous
two three-phase 66-kv wye-connected synchronous generators operating in parallel supply a load of 3000 kwat 08 power factor lagging the synchronous
parallel operation of interconnected synchronous generatorsin order to assure continuity of the power supplywithin prescribed limits of frequency and
a 1000-hp 2300-v wye-connected three-phase 60-hz 20-pole synchronous motor for which cylindrical-rotor theory can be used and all losses can be
the per-phase synchronous reactance of a three-phase wye-connected 25-mva 66-kv 60-hz turboalternator is 10 neglect the armature resistance and
q explain about synchronous machineslarge ac power networks operating at a constant frequency of 60 hz in the united states 50 hz in europe rely
a frac14-hp 230-v 60-hz four-pole single-phase inductionmotor has the following parameters and losses r1 10 xl1 xl2 125 r2 115 and xm 250 the
q explain working of single-phase induction motorsfor reasons of simplicity and cost a single-phase power supply is universally preferred for
an induction motor has a starting current that is 6 times the full-load current and a per-unit full- load slip of 004 the machine is to be provided
q methods for speed and torque control of induction motorsthe following are methods available for speed and torque control of induction motorsbull
speed and torque control of polyphase induction motorsthe induction motor is valuable in so many applications because it combines simplicity and
q what is induction machineswe shall first consider polyphase induction motors and then single-phase induction motors the polyphase induction motors
q explain polyphase induction motorthe polyphase induction motor operates with polyphase alternating current applied to the primary winding usually
q explain about rotating machinesthemost widely used electromechanical device is a rotatingmachine which utilizes themagnetic field to store energy
q what do you mean by sensors or transducersin almost all engineering applications there arises a need tomeasure some physical quantities such as
q what can explain the failure of relative ppp to hold in realityanswer government procedures of the price level differ from country to
q what effect do non-tradable goods have on pppanswer the consequence is quite substantial in 1997 the production of non-tradable goods accounted
q does the existence of non-tradable goods allow for deviations from purchasing power parityanswer yes the continuation of non-tradable goods
qis a depreciation of the dollareuro exchange rate correlated with a decrease in the dollar return on us depositsanswer no suppose that the interest
q what will be the effects of an increase in real national income on the interest rateanswer an enhance in real national income will increase