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a 3-kva 220110-v 60-hz single-phase transformer yields these test databull open-circuit test 200 v 14 a 50 wbull short-circuit test 45 v 1364 a 30
q these data were obtained from tests carried out on a 10-kva 2300230-v 60-hz distribution transformerbull open-circuit test with low-voltage winding
q a 20-kva 2200220-v 60-hz single-phase transformer has these parametersresistance of the 2200-v winding r1 250 resistance of the 220-v winding r2
q a 150-kva 2400240-v 60-hz single-phase transformer has the following parameters r1 02 r2 0002 x1 045 x2 00045 rc 10 k and xm 155 k where
q a 100-kva 2300230-v 60-hz single-phase transformer has the following parameters r1 030 r2 0003 rc1 45k x1 065 x2 00065 and xm1 10k where
q a 25-kva 2300230-v 60-hz single-phase transformer has the following parameters resistance of high-voltage winding 15 resistance of low-voltage
q 10-kva 4800240-v 60-hz single-phase transformer has an equivalent series impedance of 120 j300 referred to the primary high-voltage side the
q ac measurements with constant voltage amplitude reveal that the total core loss of a certain magnetic circuit is 10 w at f 50 hz and 13 wat f 60
q a magnetic circuit is found to have an ac hysteresis loss of 10 w when the peak current is im 2 a assuming the exponent of bm to be 15 estimate ph
q 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 increased to 90 hz while
q the flux in a magnetic core is alternating sinusoidally at a frequency of 500 hz the maximum flux density is 1 t the eddy-current loss then amounts
q a sample of iron having a volume of 20 cm is subjected to a magnetizing force varying sinusoidally at a frequency of 400 hz the area of the
q in plotting a hysteresis loop the following scales are used 1 cm 400 at mand 1 cm03 t the area of the loop for a certain magnetic material is
q a certain 10-hp 230-v motor has a rotational loss of 600 w a stator copper loss of 350 w a rotor copper loss of 350 w and a stray load loss of 50 w
q the self and mutual inductances of a machine with two windings are given by l11 1 sin theta l22 21 sin theta and l12 l21 m 1-sin theta
q a rotating electric machine with uniform air gap has a cylindrical rotor winding with inductance l2 1 h and a stator winding with inductance l1 3h
q let the coil of the solenoid of have a resistance r and be excited by a voltage v vm sin omegat consider a plunger displacement of g g0a obtain
principle of resistive feedback circuit change when the square wave and triangular pulse frequencies the amplitude of the triangle
q a two-pole rotating machine with a singly excited magnetic field system as its stator and a rotor that carries no coil has a stator-coil inductance
q a two-pole three-phase synchronous generator has a balanced three-phase winding with 15 turns per phase if the three-phase currents are given byia
q the n-coil windings of a three-phase two-pole machine are supplied with currents iaib and ic which producemmfs given by fa nia cos thetam fb nib
q a four-pole dc seriesmotor has a lap-connected two-layer armature winding with a total of 400 conductors calculate the gross torque developed for a
q 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 and the speed of the rotor is
q a four-pole dc generator is lap wound with 326 armature conductors it runs at 650 rmin on full load with an induced voltage of 252 v if the bore of
q a four-pole lap-wound armature has 144 slots with two coil sides per slot each coil having two turns if the flux per pole is 20 mwb and the