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An induction motor having full load torque of 60Nm when DELTA connected develops a starting torque of 120Nm, For the supply voltage if motor is changed to STAR connection, the starting torque developed is ____? A) 40Nm B) 60 Nm C) 90 Nm D) 120 Nm?
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An induction motor having full load torque of 60Nm when DELTA connecte...
Calculation of Starting Torque in Star and Delta Connection of Induction Motor


Introduction

In an induction motor, the starting torque and full load torque depend on the connection used to supply the motor. Two common connections used are Delta and Star connections.

Given Data

Full Load Torque (TFL) = 60 Nm

Starting Torque (TST) in Delta Connection = 120 Nm

Calculation

When an induction motor is connected in Delta configuration, the line voltage is equal to the phase voltage, but the line current is √3 times the phase current. The starting torque in the Delta connection is given by the equation:

TST(Delta) = √3 x TFL

Substituting the given values:

120 = √3 x 60

Therefore, TFL in Delta Connection = 69.28 Nm (approx)

When the same motor is connected in Star configuration, the line current is equal to the phase current, but the line voltage is √3 times the phase voltage. The starting torque in the Star connection is given by the equation:

TST(Star) = TFL

Substituting the value of TFL from above:

TST(Star) = 69.28 Nm (approx)

Answer

The starting torque developed by the motor in Star connection is approximately 69.28 Nm. Therefore, the correct option is C) 90 Nm.
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An induction motor having full load torque of 60Nm when DELTA connected develops a starting torque of 120Nm, For the supply voltage if motor is changed to STAR connection, the starting torque developed is ____? A) 40Nm B) 60 Nm C) 90 Nm D) 120 Nm?
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An induction motor having full load torque of 60Nm when DELTA connected develops a starting torque of 120Nm, For the supply voltage if motor is changed to STAR connection, the starting torque developed is ____? A) 40Nm B) 60 Nm C) 90 Nm D) 120 Nm? for SSC JE 2024 is part of SSC JE preparation. The Question and answers have been prepared according to the SSC JE exam syllabus. Information about An induction motor having full load torque of 60Nm when DELTA connected develops a starting torque of 120Nm, For the supply voltage if motor is changed to STAR connection, the starting torque developed is ____? A) 40Nm B) 60 Nm C) 90 Nm D) 120 Nm? covers all topics & solutions for SSC JE 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for An induction motor having full load torque of 60Nm when DELTA connected develops a starting torque of 120Nm, For the supply voltage if motor is changed to STAR connection, the starting torque developed is ____? A) 40Nm B) 60 Nm C) 90 Nm D) 120 Nm?.
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