Answer / akky

Sometimes called "electrical center," it's the axial
position that the shaft/rotor assembly will attempt to
maintain during steady-state running at rated voltage and
frequency, without the influence of any coupled load.

In the usual ball- or roller-bearing machine, the shaft
position is fixed by the bearing mounting. But in sleeve
bearing motors, the bearing construction inherently permits
mechanical movement or "float" (typically 1A" or 2",
depending upon motor size). Low sliding friction allows the
shaft to drift readily back and forth to seek whatever
position is dictated by the axial forces acting on the
rotor.

sir plz send some previous year questions of jspl.

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what formula can be apply to calculate the No of rtrand of a cable. ?

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What shall be the secondary output voltage if the primary winding of a 220/6V, 50 Hz transformer is energized by an 110V, 60 Hz supply?

0 Answers   HPCL,

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Please explain, how to test vector group of tranformer(Delta y1) . Thank

0 Answers   PGCB,

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If we have to find the inductance of a dc shunt motor then by giving dc supply or ac supply and what is the reason for it. (this example is from "to determine the transfer function of a dc shunt motor ")

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1. A 380 / 220 V r.m.s. 3-phase 4-wire circuit carries loads of 8 + j8.1 ohm; 4 + j4.1 ohm; and 2 +j2.1 ohmin the three phases respectively. The length of the circuit is 100 m, and the resistivity of the phase conductors is 0.0005 Ω/m. The neutral conductor is of the same size as the phase conductors. a) Select a reference angle 0for the first phase. Then write down the three phase voltages in both polar format and complex number format. b) Make appropriate assumptions, and take temperature effects on resistance is insignificant. Calculate the currents in the three phases. (Note: Determine conductor resistance, and apply Kirchhoff’s Voltage Law) Based on the result, suggest a main switch rating for the circuit. c) Show your preferred direction of neutral current in a diagram, and then determine its value. (Note: Apply superposition principle, and Kirchhoff’s Current Law) Use its magnitude to show that in this circuit, the unbalanced load may increase the voltage drop in some of the phases. (Note: Also observe the common volt drip in neutral) State your assumptions, if there are any. d) Suddenly the neutral wire of the circuit is broken. Estimate the new currents in the first phase, i.e. Phase L1. State your assumptions, if there are any.

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True or false question. 1.The fuse provide phase and neutral 2.power loss in electrical circuit can take place in (resistance or inductance or capacitance). 3.two phase system each phase has separated by a phase difference of (90 or 180 or 270 or 45). 4.3 phase balanced star connected load neutral current shall be (line current or phase current or zero or unity)

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difference between slippring induction motor and Generator?

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why does chattering take place in ac contactors? can it be avoided & what care does the manufacturer take to eliminate this phenomenon????

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what is the formulae of calculating voltage drop?

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CT Ratio of a energy meter connection is Red Phase : 100/5A, yello Phase : 50/5A & Blue phase : 100/5 A what is the overall Multiplication factor

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state working of halogen lamp?

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