Question Bank for Electrical Machine-I.

Page: 01

  1. Show torque current and speed current characteristics of D.C shunt and D.C series motor.
  2. Explain and write speed control method of D.C shunt and D.C series motor.
  3. Draw and explain exact equivalent circuit of single phase transformer and draw phasor diagram for lagging power factor.
  4. Draw equivalent circuit of an Induction motor. Prove maximum torque of induction motor is independent of rotor resistance and also find maximum torque value.
  5. Obtain equivalent circuit of 200/400 V, 50 Hz, single phase transformer for following test. O.C test: 200V, 0.7 A, 70 watt L.V Side. S.C Test: 15V, 10 A, 85 watt H.V Side. Also calculate secondary voltage when delivering 5 kW at 0.8 pf lagging. The primary voltage being 200 V.
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