circle diagram of IM EM-II

What is the name of the circle diagram used to analyze the performance of a three-phase induction motor?

• a) Rotor diagram

• b) Stator diagram

• c) Circle diagram

• d) Triangle diagram

What is the purpose of the circle diagram?

• a) To determine the efficiency of the motor

• b) To determine the power factor of the motor

• c) To determine the torque-speed characteristics of the motor

• d) To determine the voltage and current ratings of the motor

In the circle diagram, what does the diameter of the circle represent?

• a) The input power to the motor

• b) The output power of the motor

• c) The maximum torque that can be developed by the motor

• d) The maximum speed that can be achieved by the motor

In the circle diagram, what does the distance from the origin to a point on the circle represent?

• a) The power factor of the motor

• b) The slip of the motor

• c) The efficiency of the motor

• d) The torque produced by the motor

In the circle diagram, what does the slope of a tangent to the circle represent?

• a) The power factor of the motor

• b) The slip of the motor

• c) The efficiency of the motor

• d) The torque produced by the motor

In the circle diagram, what does the angle between the tangent and the horizontal axis represent?

• a) The power factor of the motor

• b) The slip of the motor

• c) The efficiency of the motor

• d) The torque produced by the motor

What is the name of the curve that represents the torque-speed characteristics of the motor in the circle diagram?

• a) Load curve

• b) Slip curve

• c) Efficiency curve

• d) Circle curve

What is the name of the line that represents the input power to the motor in the circle diagram?

• a) Efficiency line

• b) Power line

• c) Voltage line

• d) Current line

What is the significance of the circle diagram in a three-phase induction motor?

• A. It shows the relationship between stator and rotor magnetic fields

• B. It shows the voltage and current relationship in the motor

• C. It shows the power factor of the motor

• D. It shows the efficiency of the motor

What is the maximum torque that can be obtained from a three-phase induction motor?

• A. Starting torque

• B. Pull-out torque

• C. Breakdown torque

• D. Full-load torque