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The no-load test on an induction machine gives

  • A.the full-load slip and the efficiency of the machine directly
  • B.the core loss, friction and windage, and the magnetising parameters
  • C.the resistance of the rotor circuit referred across to the stator winding of the machine
  • D.the leakage reactance of the stator and rotor taken together

Answer: B

With the rotor turning almost at synchronous speed, its current is negligible and the input is nearly all core and mechanical loss. Repeating the test at reduced voltage lets the two be separated by extrapolating to zero voltage.

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