MCQs on Electric Motor & Generator 6

  1. Centrifugal switch is absent in which of the single phase induction motor ?

    Under construction.

  2. In the fig. value of resistance R in ohms is? diagram

    By KCL ( Vp - 100 ) / 10 + Vp / 10 + 2 = 0, Vp = 40 V. Therefore, R= Vp / 2 = 20 Ω .

  3. In case of induction motors the ratio of length to pole pitch for minimum cost, is taken as

    Under construction.

  4. The use of double squirrel cage winding on the rotor provides

    Under construction.

  5. Which of the following machine is invariably provided with forced ventilation ?

    Under construction.

  6. In induction motors, there is large decrease in maximum power factor when the dispersion coefficient is ________________.

    Under construction.

  7. In induction motor when the length of the air gap is increased, the magnetizing current of the motor increases while the short circuit current __________________.

    Under construction.

  8. In electrical machines the material preferred for pole shoes of electro - magnets is

    Under construction.

  9. Which of the following gives materials in order of decreasing values of permeability ?

    Under construction.

  10. Hunting phenomenon is observed in which motor?

    Under construction.

  11. Reluctance and hysteresis motors are the types of which electrical motor ?

    The Dalton’s atomic theory is not dealing with dense central nucleus.

  12. In moist condition which frame of motor will be preferred?

    Under construction.

  13. The wattage rating of a ceiling fan motor will be

    Under construction.