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Which of the following is classed as a high resistance?

  • A.the shunt fitted across a moving coil movement to extend its current range
  • B.the armature winding of a small direct current machine of a few kilowatts
  • C.the copper field winding of a shunt-excited direct current generator
  • D.the insulation of a power cable

Answer: D

Cable insulation runs to hundreds of megohms and sometimes to thousands. An instrument shunt is a few milliohms, an armature winding a fraction of an ohm and a shunt field winding a few hundred ohms, which places them in the low and medium classes respectively.

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