ELECTRO-MECHANICAL DESIGN (EMD) COURSE –
EXAM QUESTIONS AND CORRECT ANSWERS VEIFIED
ANSWERS PLUS RAIONALES 2025/2026 Q&A |
INSTANT DOWNLOAD PDF
1. Which of the following best describes an electro-mechanical system?
A. A system that uses only electrical energy
B. A system that uses both electrical and mechanical energy
C. A system that stores thermal energy
D. A system that converts chemical energy to light
Correct Answer: B – Electro-mechanical systems combine electrical and mechanical components
to perform work.
2. What is the main purpose of a transducer?
A. To convert mechanical energy into heat
B. To convert one form of energy into another
C. To amplify signals
D. To store electrical energy
Correct Answer: B – Transducers convert one form of energy, such as mechanical, into another,
like electrical.
3. In DC motors, the function of a commutator is to:
A. Store charge
B. Reverse current direction in the armature
C. Reduce friction
D. Control voltage input
Correct Answer: B – The commutator ensures current reversal to maintain continuous rotation.
,4. Which component controls motion in an electro-mechanical actuator?
A. Sensor
B. Motor
C. Controller
D. Battery
Correct Answer: C – The controller processes input signals and adjusts motor behavior
accordingly.
5. Stepper motors are commonly used for:
A. Continuous speed control
B. Precise positioning
C. Generating AC power
D. Heating applications
Correct Answer: B – Stepper motors are designed for accurate position control.
6. Which of the following sensors is used to detect angular position?
A. Thermistor
B. Potentiometer
C. Photodiode
D. Accelerometer
Correct Answer: B – Potentiometers convert angular displacement into a voltage signal.
7. Which law governs electromagnetic induction?
A. Newton’s first law
B. Ohm’s law
C. Faraday’s law
D. Coulomb’s law
Correct Answer: C – Faraday’s law states that a changing magnetic field induces an EMF.
8. The unit of torque is:
A. Watt
B. Joule
C. Newton-meter
, D. Volt
Correct Answer: C – Torque is measured in newton-meters (N·m).
9. The efficiency of an electric motor is the ratio of:
A. Input power to output power
B. Output power to input power
C. Mechanical loss to input power
D. Electrical loss to output power
Correct Answer: B – Efficiency = (Output Power / Input Power) × 100%.
10. A solenoid converts:
A. Electrical energy to linear motion
B. Electrical energy to rotation
C. Heat to electricity
D. Light to mechanical energy
Correct Answer: A – Solenoids produce linear motion when energized.
11. Which type of motor is typically used in robotic arms?
A. Stepper motor
B. DC shunt motor
C. Induction motor
D. Universal motor
Correct Answer: A – Stepper motors allow precise control for robotic movement.
12. The mechanical output of a servo motor is controlled by:
A. Feedback signal
B. Voltage input
C. Resistance change
D. Frequency response
Correct Answer: A – Servo systems use feedback to adjust output to desired position.
13. In a control system, the term “actuator” refers to:
A. The device that measures output
EXAM QUESTIONS AND CORRECT ANSWERS VEIFIED
ANSWERS PLUS RAIONALES 2025/2026 Q&A |
INSTANT DOWNLOAD PDF
1. Which of the following best describes an electro-mechanical system?
A. A system that uses only electrical energy
B. A system that uses both electrical and mechanical energy
C. A system that stores thermal energy
D. A system that converts chemical energy to light
Correct Answer: B – Electro-mechanical systems combine electrical and mechanical components
to perform work.
2. What is the main purpose of a transducer?
A. To convert mechanical energy into heat
B. To convert one form of energy into another
C. To amplify signals
D. To store electrical energy
Correct Answer: B – Transducers convert one form of energy, such as mechanical, into another,
like electrical.
3. In DC motors, the function of a commutator is to:
A. Store charge
B. Reverse current direction in the armature
C. Reduce friction
D. Control voltage input
Correct Answer: B – The commutator ensures current reversal to maintain continuous rotation.
,4. Which component controls motion in an electro-mechanical actuator?
A. Sensor
B. Motor
C. Controller
D. Battery
Correct Answer: C – The controller processes input signals and adjusts motor behavior
accordingly.
5. Stepper motors are commonly used for:
A. Continuous speed control
B. Precise positioning
C. Generating AC power
D. Heating applications
Correct Answer: B – Stepper motors are designed for accurate position control.
6. Which of the following sensors is used to detect angular position?
A. Thermistor
B. Potentiometer
C. Photodiode
D. Accelerometer
Correct Answer: B – Potentiometers convert angular displacement into a voltage signal.
7. Which law governs electromagnetic induction?
A. Newton’s first law
B. Ohm’s law
C. Faraday’s law
D. Coulomb’s law
Correct Answer: C – Faraday’s law states that a changing magnetic field induces an EMF.
8. The unit of torque is:
A. Watt
B. Joule
C. Newton-meter
, D. Volt
Correct Answer: C – Torque is measured in newton-meters (N·m).
9. The efficiency of an electric motor is the ratio of:
A. Input power to output power
B. Output power to input power
C. Mechanical loss to input power
D. Electrical loss to output power
Correct Answer: B – Efficiency = (Output Power / Input Power) × 100%.
10. A solenoid converts:
A. Electrical energy to linear motion
B. Electrical energy to rotation
C. Heat to electricity
D. Light to mechanical energy
Correct Answer: A – Solenoids produce linear motion when energized.
11. Which type of motor is typically used in robotic arms?
A. Stepper motor
B. DC shunt motor
C. Induction motor
D. Universal motor
Correct Answer: A – Stepper motors allow precise control for robotic movement.
12. The mechanical output of a servo motor is controlled by:
A. Feedback signal
B. Voltage input
C. Resistance change
D. Frequency response
Correct Answer: A – Servo systems use feedback to adjust output to desired position.
13. In a control system, the term “actuator” refers to:
A. The device that measures output
