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Thomas Johnston
  • 1. Where was Thomas Johnston born?
A) India
B) Australia
C) United States
D) Scotland
  • 2. What type of energy is typically associated with electric motors?
A) Solar energy
B) Electrical energy
C) Nuclear energy
D) Wind energy
  • 3. What material is traditionally used to create the coils in an electric motor?
A) Silver
B) Aluminum
C) Steel
D) Copper
  • 4. What is the role of the commutator in an electric motor?
A) Generates electricity
B) Stores energy
C) Reverses the direction of current
D) Regulates motor speed
  • 5. Which physical principle is fundamental to the operation of an electric motor?
A) Kinetic energy
B) Electromagnetism
C) Quantum mechanics
D) Thermodynamics
  • 6. In which industry are electric motors commonly used for automation and control systems?
A) Agriculture
B) Manufacturing
C) Construction
D) Healthcare
  • 7. What role do capacitors play in some electric motors?
A) Store kinetic energy
B) Suppress electromagnetic interference
C) Regulate voltage
D) Improve power factor
  • 8. What do VFDs (Variable Frequency Drives) do in relation to electric motors?
A) Adjust wire gauge
B) Change motor size
C) Control motor speed and torque
D) Stabilize electrical current
  • 9. What is a common issue that can occur with electric motors due to prolonged use?
A) Underpowering
B) Short-circuiting
C) Overheating
D) Overspeeding
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