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In torque-slip characteristics of an induction motor, at normal speeds close to synchronism the torque is:
  • a)
    directly proportional to the slip
  • b)
    not dependent on the slip
  • c)
    maximum
  • d)
    inversely proportional to the slip.
Correct answer is option 'A'. Can you explain this answer?
Most Upvoted Answer
In torque-slip characteristics of an induction motor, at normal speeds...
The torque in a three-phase induction motor is given by,

Observations:
1. At standstill, 
Torque is directly proportional to the square of the supply voltage.
2. For the low values of slip, i.e. for the speeds close to the synchronous speed
 i.e. the effective rotor circuit resistance is very large compared to the rotor reactance.

T ∝ s
Torque is directly proportional to slip. Thus, torque-slip characteristics are linear in the lower slip region.
3. For the high values of slip, i.e. for the speeds away from the synchronous speed
 i.e. the effective rotor circuit resistance is very small compared to the rotor reactance.

T ∝ 1/s
Torque is inversely proportional to slip. Thus, torque-slip characteristics are rectangular hyperbola at higher slip region.
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Community Answer
In torque-slip characteristics of an induction motor, at normal speeds...
The torque in a three-phase induction motor is given by,

Observations:
1. At standstill, 
Torque is directly proportional to the square of the supply voltage.
2. For the low values of slip, i.e. for the speeds close to the synchronous speed
 i.e. the effective rotor circuit resistance is very large compared to the rotor reactance.

T ∝ s
Torque is directly proportional to slip. Thus, torque-slip characteristics are linear in the lower slip region.
3. For the high values of slip, i.e. for the speeds away from the synchronous speed
 i.e. the effective rotor circuit resistance is very small compared to the rotor reactance.

T ∝ 1/s
Torque is inversely proportional to slip. Thus, torque-slip characteristics are rectangular hyperbola at higher slip region.
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In torque-slip characteristics of an induction motor, at normal speeds close to synchronism the torque is:a)directly proportional to the slipb)not dependent on the slipc)maximumd)inversely proportional to the slip.Correct answer is option 'A'. Can you explain this answer?
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