Servo Motor MCQs with Answers

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Servo Motor MCQs with Answers: Following Multiple Choice Questions (MCQs) are based on “Servo Motor”.

Topics: Construction and working of Servomotor, AC and DC servo motor, Applications of servo Motors.

These are related to subject Electrical Machines or Basic Electrical Engineering. This topic is mostly beneficial in the field of Electronics, Electrical and Mechanical Engineering.

These MCQs will be useful in various competitive examinations, entrance examinations, oral examination (Viva voce), certifications and interviews.

MCQs on Servo Motor

Que.1 Servomotor is a closed loop feedback control system.
  1. True
  2. False

✔ View Answer

Option 1: True

Que.2Servomotors are usually rated in ________.
  1. KW
  2. toque/hour
  3. KVA
  4. kg/cm

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Option 4: kg/cm

Explanation: Servo motors are usually rated in kg/cm while other motors are usually rated in KVA.
It means how much weight does a motor can lift if the load is suspended at a specific distance from the shaft of motor.
Que.3 Which of the following is most accurate motor?
  1. Squirrel cage induction motor
  2. Universal motor
  3. Servomotor
  4. Repulsion motor

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Option 3: Servomotor

Que.4A DC servo motor consists of
(i) a small DC motor,
(ii) feedback circuit,
(iii) gearbox.
  1. Only (i)
  2. Only (ii) and (iii)
  3. All of the above
  4. only (i) and (ii)

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Option 3: All of the above

Explanation: A DC servo motor consists of a small DC motor, feedback potentiometer, gearbox, motor drive electronic circuit and electronic feedback control loop.
Que.5The DC servomotors can be controlled by _______.
  1. a d.c. motor
  2. pulse width modulation
  3. pulse position modulation
  4. system of pulses to each phase

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Option 2: pulse width modulation

Que.6Consider the following statements regarding DC servomotor:
i. The speed of servomotor can be controlled by varying the armature voltage.
ii. The armature is deliberately designed to have large armature resistance.
  1. Only statement (i) is correct.
  2. Only statement (ii) is correct.
  3. Both statements (i) and (ii) are correct.
  4. Both statements are wrong.

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Option 3: Both statements (i) and (iii) are correct.

Que.7Most of the a.c. motors used in servo applications are
  1. Three phase induction motors
  2. Two phase induction motors
  3. Single phase induction motors
  4. Synchronous motors

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Option 2: Two phase induction motors

Que.8 In AC servomotor main winding and control winding are displaced by
  1. 90O electrically
  2. 90O mechanically
  3. 180O electrically
  4. 180O mechanically

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Option 1: 90 degree electrically

Que.9 Consider the following statements regarding AC servomotor:
i. Reference phase is provided with fixed voltage.
ii. Control phase is provided with variable voltage of different frequency.
iii. The speed and torque of the rotor are controlled by phase difference between the reference and control windings.
  1. Only statement (i) and (ii) are correct.
  2. Only statement (ii) and (iii) are correct.
  3. All of the above statements are correct.
  4. Only statement (i) and (iii) are correct.

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Option 4: Only statement (i) and (iii) are correct.

Explanation: Control phase is provided with variable voltage of same frequency.
Que.10 A servomechanism is a feedback control system used to control
  1. Position
  2. Velocity
  3. Acceleration
  4. All of the above

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Option 4: All of the above

Explanation: Servomechanism controls position and derivatives of position such as velocity and acceleration.
Que.11 One of the basic requirements of servomotor is that it must produce high torque at all
  1. voltages
  2. loads
  3. speeds
  4. frequencies

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Option 3: speeds

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