The maximum torque in an induction motor depends on___________?

Related Mcqs:

1. 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

2. 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

3. 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

4. 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

5. The starting torque of a 3-phase squirrel cage induction motor is____________?

   A. twice the full load torque
   B. 1.5 times the full load torque
   C. equal to full load torque

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. Insertion of resistance in the rotor of an induction motor to develop a given torque?

   A. decreases the rotor current
   B. increases the rotor current
   C. rotor current becomes zero
   D. rotor current rernains same

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