Short-circuit test on an induction motor cannot be used to determine___________?

Related Mcqs:

1. When the equivalent circuit diagram of doouble squirrel-cage induction motor is constructed the two cages can be considered__________?

   A. in series
   B. in parallel
   C. in series-parallel
   D. in parallel with stator

2. The circle diagram for an induction motor cannot be used to determine____________?

   A. efficiency
   B. power factor
   C. frequency
   D. output

3. Slip ring motor is preferred over squirrel cage induction motor where___________?

   A. high starting torque is required
   B. load torque is heavy
   C. heavy pull out torque is required
   D. all of the above

4. The torque of an induction motor is___________?

   A. directly proportional to slip
   B. inversely proportional to slip
   C. proportional to the square of the slip
   D. none of the above

5. An induction motor with 1000 r.p.m. speed will have____________?

   A. 8 poles
   B. 6 poles
   C. 4 poles
   D. 2 poles

6. Which of the following methods is easily applicable to control the speed of the squirrel-cage induction motor _____________?

   A. By changing the number of stator poles
   B. Rotor rheostat control
   C. By operating two motors in cascade
   D. By injecting e.m.f. in the rotor circuit

7. The torque developed in the cage induction motor with autostarter is___________?

   A. k/torque with direct switching
   B. K x torque with direct switching
   C. K2 x torque with direct switching
   D. k2/torque with direct switching

8. As load on an induction motor goes on increasing______________?

   A. its power factor goes on decreasing
   B. its power factor remains constant
   C. its power factor goes on increasing even after full load
   D. its power factor goes on increasing up to full load and then it falls again

9. The vafcie of transformation ratio of an induction motor can be found by__________?

   A. open-circuit test only
   B. short-circuit test only
   C. stator resistance test
   D. none of the above

10. For driving high inertia loads best type of induction motor suggested is_____________?

    A. slip ring type
    B. squirrel cage type
    C. any of the above
    D. none of the above