3-PHASE INDUCTION MOTOR - 4
3-Phase Induction Motor Quiz
Test your knowledge of 3-phase induction motors with our comprehensive quiz designed for enthusiasts and professionals alike. This quiz covers essential concepts and practical applications related to induction motors.
Whether you're in the field or just starting out, this quiz will help you solidify your understanding. Key features:
- 10 multiple-choice questions
- Instant feedback on your answers
- Track your progress
31. A pump induction motor is switchead on to a supply 30% lower than the rated voltage. The pump runs. What will eventually happen? It will __________
Stall after sometime
Stall immediately
Continue to run at lower speed without damage
Get heated and subsequently get damaged
32. A 3-phase slip ring motor has __________
Double cage rot
Wound rotor
Short circuited rotor
Any of the above
33. The torque developed in an induction motor is nearly proportional to ___________
1/V
V
Square of V
1/square of V
34. The shape of the torque/slip curve of induction motor is __________
Parabola
Hyperbola
Rectangular parabola
Straight line
35. A change of 4% of supply voltage to an induction motor will produce a change of approximately ___________
4% in the rotor torque
8% in the rotor torque
12% in the rotor torque
16% in the rotor torque
36. The stating torque of the slip ring induction motor can be increased by adding _______
External inductance to the rotor
. External resistance to the rotor
. External capacitance to the rotor
Both resistance and inductance to rotor
37. A 500 kW, 3-phase,440 volts, 50 Hz, A.C.induction rotor has a speed of 960 r.p.m. on full load. The machine has 6 poles. The slip of the machine will be __________
0.01
0.02
0.03
0.04
38. What will happen if the relative speed between the rotating flux of stator and rotor of the induction motor is zero?
The slip of the motor will be 5%
The rotor will not run
The rotor will run at very high speed
The torque produced will be very large
39. In an induction motor if air-gap is increased _____________
Power factor will be low
Windage losses will be more
Bearing friction will reduce
Copper loss will reduce
40. In case of a double cage induction motor, the inner cage has __________
High inductance and low resistance
Low inductance and high resistance
Low inductance and low resistance
High inductance and high resistance
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