V and Inverted V curve

What is the V-curve of a synchronous motor?

• A. It shows the relationship between the excitation current and the power factor of the motor.

• B. It shows the relationship between the load torque and the speed of the motor.

• C. It shows the relationship between the output power and the rotor speed of the motor.

• D. It shows the relationship between the armature current and the torque of the motor.

The inverted V-curve of a synchronous motor shows:

• A. The relationship between the load torque and the speed of the motor.

• B. The relationship between the excitation current and the power factor of the motor.

• C. The relationship between the armature current and the torque of the motor.

• D. None of the above.

The V-curve of a synchronous motor is useful for:

• A. Determining the best excitation current for a given load.

• B. Determining the best load for a given excitation current.

• C. Determining the maximum torque that the motor can produce.

• D. Determining the maximum speed that the motor can operate at.

The inverted V-curve of a synchronous motor is useful for:

• A. Determining the best excitation current for a given load.

• B. Determining the best load for a given excitation current.

• C. Determining the maximum torque that the motor can produce.

• D. Determining the maximum speed that the motor can operate at.

The V-curve of a synchronous motor is a:

• A. Concave curve

• B. Convex curve

• C. Straight line

• D. Parabolic curve

The inverted V-curve of a synchronous motor is a:

• A. Concave curve

• B. Convex curve

• C. Straight line

• D. Parabolic curve

The minimum excitation current required to maintain synchronism in a synchronous motor is called:

• A. Pull-in torque

• B. Pull-out torque

• C. Full-load torque

• D. Breakdown torque

The maximum power factor of a synchronous motor occurs at:

• A. Unity excitation current

• B. Zero excitation current

• C. Low excitation current

• D. High excitation current

In an induction motor, the rotor speed is:

• A. Equal to the stator speed

• B. Less than the stator speed

• C. More than the stator speed

• D. Random

The maximum torque of an induction motor occurs at:

• A. The same speed as the synchronous speed

• B. A speed slightly slower than the synchronous speed

• C. A speed slightly faster than the synchronous speed

• D. None of the above