In case of the induction motors the torque is___________?

Related Mcqs:

1. 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

2. The starting torque of a squirrel-cage induction motor is___________?

   A. low
   B. negligible
   C. same as full-load torque
   D. slightly more than full-load torque

3. 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

4. In case of 3-phase induction motors, plugging means__________?

   A. pulling the motor directly on line without a starter
   B. locking of rotor due to harmonics
   C. starting the motor on load which is more than the rated load
   D. interchanging two supply phases for quick stopping

5. The maximum torque in an induction motor depends on___________?

   A. frequency
   B. rotor inductive reactance
   C. square of supply voltage
   D. all of the above

6. The shape of the torque/slip curve of induction motor is__________?

   A. parabola
   B. hyperbola
   C. rectangular parabola
   D. straigth line

7. The stating torque of the slip ring induction motor can be increased by adding__________?

   A. external inductance to the rotor
   B. external resistance to the rotor
   C. external capacitance to the rotor
   D. both resistance and inductance to rotor

8. The torque of a rotor in an induction motor under running condition is maximum__________?

   A. at the unit value of slip
   B. at the zero value of slip
   C. at the value of the slip which makes rotor reactance per phase equal to the resistance per phase
   D. at the value of the slip which makes the rotor reactance half of the rotor

9. The torque developed by a 3-phase induction motor least depends on__________?

   A. rotor current
   B. rotor power factor
   C. rotor e.m.f.
   D. shaft diameter

10. The starting torque of a three phase induction motor can be increased by__________?

    A. increasing slip
    B. increasing current
    C. both A. and (b)
    D. none of the above