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Servo Motor Question & Answers

July 27, 2023 By Wat Electrical

This article lists 100 Servo Motor MCQs for engineering students. All the Servo Motor Questions & Answers given below include a hint and a link wherever possible to the relevant topic. This is helpful for users who are preparing for their exams, interviews, or professionals who would like to brush up on the fundamentals of Servo Motor.

A servo motor is a type of rotary actuator that allows for precise control of angular position. It is widely used in various applications that require precise motion control, such as robotics, industrial automation, aerospace, and model-making.

Servo motors have a closed-loop control system, which means they constantly receive feedback about their current position and adjust their rotation accordingly to reach the desired position accurately.

Most servo motors consist of a DC motor combined with a set of gears to reduce the motor's high-speed, low-torque output to a lower-speed, higher-torque output. This gearing mechanism enhances the motor's ability to maintain a steady position.

Servo motors are often controlled using PWM signals. The control signal is sent as pulses with varying widths, and the motor interprets the pulse width to determine the desired position.

It's essential to choose the right servo motor for a specific application based on factors such as torque requirements, speed, physical size, and communication protocol compatibility.

1). What is a servo motor?

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2). Which of the following is NOT a type of servo motor?

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3). What principle allows a servo motor to achieve precise control?

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4). Which component of a servo motor is responsible for providing feedback?

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5). Which type of servo motor is more suitable for high-speed applications?

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6). What is the unit of measurement for servo motor speed?


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7). Which motor characteristic defines the amount of load a servo motor can handle?

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8). Which of the following is a disadvantage of using a servo motor?

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9). Which component is used to amplify the electrical signals sent to the servo motor?

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Read more about Torque Converter

10). What is the purpose of a gearbox in a servo motor system?

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11). The resolution of a servo motor refers to ________________?

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12). Which type of servo motor is best suited for applications requiring continuous rotation?

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13). What is the primary advantage of a closed-loop servo system over an open-loop system?

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14). Which component of a servo motor system is responsible for supplying power to the motor?

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15). What type of signal does a servo motor's controller typically receive?

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16).Speed is measured in terms of?

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17). The "dead-band" in a servo motor control system refers to ____________________?

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18). Which type of servo motor control method is commonly used for robotics and automation?

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19). Which factor should be considered when selecting a servo motor for an application?

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20). What is the primary advantage of using a brushless DC (BLDC) servo motor?

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Read more about  DC servo motor

21). In a PID controller, how is the control output calculated from the error signal?

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22). Which term describes the difference between the desired position and the actual position in a servo motor system?

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23). What year was the first servo motor invented?

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24). The initial application of servo motors was primarily in which field?

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25). Which of the following is not a type of servo motor?

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Read more about Stepper Motor

Servo Motor MCQ for Quiz 

26). Who invented the first practical servo motor?

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27). What is the primary difference between a servo motor and a regular DC motor?

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28). Which component in a servo motor is responsible for providing feedback to maintain position accuracy?

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29). The term “servomechanism” is derived from two words: “servo” and “mechanism.” What does “servo” mean?

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30). Which industrial revolution saw a significant advancement in servo motor technology?

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31). The pulse width modulation technique is commonly used in servo motors for ___________________?

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32). The concept of a servo mechanism dates back to which ancient civilization?

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33). Which type of servo motor is more suitable for high-speed applications?

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34). Which of the following is a common cause of servo motor failure?

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35). The resolution of a servo motor’s encoder is an indication of its __________________?

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36). What is the function of a servo motor driver (servo amplifier)?

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37). Which famous physicist and mathematician made significant contributions to the theory of servomechanisms?

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38). The “deadband” in a servo system refers to _______________?

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39). Which servo motor technology is known for its ability to eliminate the need for brushes and commutators?

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40). The concept of feedback control in servo systems was formalized in the early __________________?

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41). What is the primary advantage of a closed-loop servo system compared to an open-loop system?

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42). Which of the following industries was an early adopter of servo motor technology?

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43). Which equation represents the relationship between the rotational speed (ω) of a servo motor and the number of poles (P) in the motor?

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44). A servo motor has a gear ratio of 1:5 and an output shaft speed of 500 RPM. What is the speed of the motor’s rotor?

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45). Which equation represents the relationship between torque (T) and angular acceleration (α) of a servo motor?

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46). A servo motor requires 2 milliseconds to move from 90 degrees to 180 degrees. What is its angular velocity?

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47). If the feedback signal of a servo motor indicates an error between the desired position and the current position, what control action is commonly used to minimize the error?

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48). Which of the following is a unique feature of coreless DC servo motors?

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49). The armature winding in a coreless DC servo motor is typically wound on a ____________________?

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50). Which of the following is a significant advantage of coreless DC servo motors?

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Servo Motor Questions for Interviews

51). What is the primary drawback of coreless DC servo motors?

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52). Which of the following types of feedback devices is commonly used in coreless DC servo motors for closed-loop control?

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53). In a coreless DC servo motor, the absence of an iron core reduces _____________________?

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54). Which of the following is a suitable application for a coreless DC servo motor?

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55). The rotor of a coreless DC servo motor is typically made of ____________________?

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56). What is the basic principle behind the operation of a DC servo motor?

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57). In a DC servo motor, the armature current is directly proportional to ____________________?

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58). The torque produced by a DC servo motor is directly proportional to ___________________?

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59). Which equation represents the relationship between back EMF € and armature voltage (V) in a DC servo motor?

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60). What is the role of a commutator in a DC servo motor?

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61). What happens to the back EMF of a DC servo motor as its speed increases?

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62). The armature reaction in a DC servo motor refers to the effect of ____________________?

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63). Which equation represents the relationship between motor speed (N) and back EMF € in a DC servo motor?

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64). What is the primary function of the field windings in a DC servo motor?

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65). The torque-speed characteristic of a DC servo motor is typically represented by a __________________?

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66). What is the primary function of a Harmonic Drive in a servo motor system?

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67). Harmonic Drive gears are known for their high __________________?

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68). In a Harmonic Drive, the wave generator is responsible for ____________________?

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69). The Harmonic Drive was invented by ___________________?

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70). Which type of Harmonic Drive uses an elliptical wave generator?

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71). The stiffness of a Harmonic Drive is primarily dependent on _________________?

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72). What is the typical range of gear ratios offered by Harmonic Drive systems?

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73). Harmonic Drive gears are commonly used in applications that require ___________________?

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74). Which component is responsible for torque transmission in a Harmonic Drive?

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75). What type of motion can be achieved using a Harmonic Drive?

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Servo Motor MCQ for Exams

76). The main advantage of a Harmonic Drive over traditional gear systems is its ____________________?

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77). In a Harmonic Drive system, the phase difference between the wave generator and flex spline results in ____________________?

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78). The gear ratio of a Harmonic Drive system is determined by the ____________________?

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79). What type of bearing is commonly used in Harmonic Drive systems?

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80). Harmonic Drive systems are widely used in which of the following industries?

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81). What is the purpose of a Harmonic Drive coupling in a servo motor setup?

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82). Which type of Harmonic Drive is more suitable for high-torque applications?

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83). The torque output of a Harmonic Drive system depends on the ___________________?

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84). What is the primary limitation of Harmonic Drive systems?

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85). Harmonic Drive gears are known for their excellent ____________________?

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86). The term “Harmonic Drive” refers to __________________?

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87). The primary application of a Harmonic Drive is in _________________?

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88). In a Harmonic Drive system, what is the effect of increasing the wave generator speed?

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89). Harmonic Drive systems are commonly used in robotic applications due to their __________________?

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90). What is the typical efficiency range of Harmonic Drive systems?

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91). The primary advantage of a Harmonic Drive in robotic applications is its ability to _____________________?

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92). Which material is commonly used for the flex spline in a Harmonic Drive system?

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93). What is the primary factor that limits the maximum torque capacity of a Harmonic Drive?

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94). Harmonic Drive gears are classified as_________________?

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95). The Harmonic Drive system was initially developed for use in _______________?

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96). In a PID controller, the proportional term is responsible for ____________________?

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97). The integral term in a PID controller is used to ________________?

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98). The differential term in a PID controller is used to ___________________?

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99). Which term of the PID controller is responsible for anticipating future errors and providing anticipatory control?

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100). In a PID controller, how is the control output calculated from the error signal?

Hint

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