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Which of the following is the correct sequence of T-N characteristic representing the Effect of Supply voltage variation, Supply frequency variation and rotor resistance variation respectively?
ABC
BCA
CAB
BAC
ABC
Quick Trick: Analyze the effects of each parameter on the T-N characteristic; supply voltage affects torque, supply frequency affects speed, and rotor resistance affects losses.
Analyze the effects of each parameter on the T-N characteristic; supply voltage affects torque, supply frequency affects speed, and rotor resistance affects losses.
Identify the Effects
Supply voltage variation increases torque, supply frequency variation affects speed characteristic, and rotor resistance variation impacts efficiency.
Determine the Order
Based on the influence on T-N characteristics, the first effect is voltage (A), followed by frequency (B), and then rotor resistance (C).
B: Incorrect order of effects; C: Incorrect sequence as it misplaces rotor resistance; D: Misordering of parameters as well.
A is correct because it is the proper sequence in which supply voltage variation, supply frequency variation, and rotor resistance variation affect the T-N characteristic.
In exams, practice questions about motor characteristics; similar patterns appear in other electrical systems.