What is the primary function of a servo motor?

• To provide linear motion

• To provide accurate control of position and speed

• To increase torque without feedback

• To decrease electrical current

Answer explanation

Servo motors are designed for precise control of angular or linear position, velocity, and acceleration. This is why they are commonly used in applications requiring high accuracy

What type of feedback is commonly used in a servo motor system?

• Voltage feedback

• Current feedback

• Position feedback

• Temperature feedback

Answer explanation

Position feedback, typically provided by encoders or potentiometers, is crucial for servo motor systems to continuously monitor and adjust the motor's position for accuracy

Which of the following is an essential component of a servo motor?

• Brake

• Potentiometer

• Encoder

• Diode

Answer explanation

Encoders provide the feedback required for position control, making them a key component in servo systems. Potentiometers are also used in some systems, especially for simpler feedback

What does a servo motor's control signal determine?

• Voltage

• Speed and direction

• Position, speed, and torque

• Current

Answer explanation

The control signal, typically using PWM, helps regulate the motor's position, speed, and sometimes torque, depending on the requirements of the system.

What type of motor is typically used in a servo motor system?

• Stepper motor

• DC / AC motor

• Induction motor

• Synchronous motor

Answer explanation

DC motors are commonly used in servo systems because they respond quickly to control signals and are easier to manage for precise control. AC motors are also used in industrial servo applications

In what type of applications are servo motors commonly used?

• High-speed elevators

• Low-power lighting systems

• Robotic arms and CNC machines

• Generators

Answer explanation

Servo motors are used in applications like robotic arms, CNC machines, and other automation systems that require precise, controlled movement.

How does a pulse-width modulation (PWM) signal affect a servo motor?

• It controls the temperature

• It controls the torque output

• It controls the motor's rotational position

• It stabilizes the motor's speed

Answer explanation

The PWM signal varies the duty cycle, which in turn adjusts the motor's rotational position, making it a common method for controlling servos in precise applications.

Which of the following is a disadvantage of using a servo motor?

• High power consumption

• Low efficiency at low speeds

• High cost

• Complex control system

Answer explanation

Servo motors, especially high-precision ones, are more expensive compared to other motors like stepper motors, due to their advanced control and feedback systems

What happens if the feedback system in a servo motor fails?

• The motor stops rotating

• The motor continues rotating at full speed

• The motor operates in an uncontrolled manner

• The motor slows down gradually

Answer explanation

If feedback fails, the motor cannot adjust its position or speed, leading to erratic, uncontrolled behavior since the system no longer has the correct information to make adjustments

Which of the following is true about closed-loop control in a servo motor system?

• It doesn’t require feedback

• It continuously adjusts the motor’s output based on feedback

• It controls only the torque of the motor

• It operates without any sensors

Answer explanation

Closed-loop control relies on continuous feedback to adjust the motor’s position, speed, or torque in real-time, ensuring that the motor operates according to the desired input