Describe how you would find the resistance of a coil of insulated wire

Describe how you would find the resistance of a coil of insulated wire using

 

either (a) a slide-wire bridge or (b) an ammeter and voltmeter. 2.Atwin-core PVC-insulated and armoured cable is known to have a low-resistance fault to earth on one core only. The second core is in sound condition. Describe, with diagrams, the Murray-loop method of finding the position of the fault, and explain how the test results would be used for this purpose. 30 Figure 11.53 shows the various pieces of apparatus to be used in determining the position of an earth fault on a metal-sheathed two-core cable AB, by means of a Murray-loop test. Complete the diagram to show the apparatus connected to the cable ready for the test.

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Sketch the load characteristics, terminal voltage/load current, of the following types of DC generator

1. (a) Sketch the load characteristics, terminal voltage/load current, of the following types of DC generator: (i) series-connected, (ii) shunt-connected and (iii) compound-connected.   (b) State one purpose for which….

what happens if the resistance in series with the shunt field of a DC motor is increased in value

1. Sparking at the trailing edges of the brushes in a DC machine is usually prevented by fitting   (a) copper gauze brushes (b) a compensating winding (c) a compound….

Calculate the synchronous speed of a 10-pole three-phase machine connected to a 50 Hz supply.

1. The generator characteristic shown in Figure 9.28 is for a   (a) shunt machine (b) series machine (c) differentially compounded machine (d) cumulatively compounded machine 2.The speed of a….