EE19602 - SOLID STATE DRIVES

Which statement is TRUE about electric drives?

• They offer only speed control.

• They are less efficient than mechanical drives

• They can provide precise torque and speed control.

• They are only suitable for light loads

How does the starting current of an electric motor relate to its load torque?

• Directly proportional

• Inversely proportional

• No relationship

• Depends on motor type and load characteristics

Explain the importance of steady-state stability in electric drives.

• Ensures efficient operation

• Maintains constant speed under constant load

• Prevents motor overheating

• All of the above

What are the four quadrants of operation in a multi-quadrant DC motor?

• Forward motoring, forward braking, reverse motoring, reverse braking

• Low speed, medium speed, high speed, very high speed

• Constant torque, constant power, variable torque, variable power

• Open loop, closed loop, manual control, automatic control

In the context of motor deceleration, what is coasting?

• Gradual decrease in speed

• Rapid decrease in speed

• Sudden increase in speed

• Maintaining constant speed

What is the primary cause of energy loss in an electric motor?

• Load torque

• Inertia

• Core losses

• Voltage fluctuations

During motor deceleration, what happens to the load torque?

• Increases

• Decreases

• Remains constant

• Reverses direction

What is the primary factor affecting motor load dynamics during acceleration?

• Load torque

• Motor speed

• Voltage

• Frequency

In an electric drive, which device is responsible for converting DC to AC?

• Rectifier

• Inverter

• Transformer

• Capacitor

Steady-state stability in an electric drive system refers to:

• The ability to start and stop quickly

• Maintaining a constant speed under steady load conditions

• Coping with sudden changes in load

• Long-term system reliability