Which of the following machines converts electrical energy into mechanical energy?

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ALP CBT 2 Electrician Previous Paper: Held on 22 Jan 2019 Shift 1
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  1. Synchronous motor
  2. SMPS
  3. UPS
  4. Dynamo

Answer (Detailed Solution Below)

Option 1 : Synchronous motor
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Detailed Solution

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  • An electric motor is an electrical machine that converts electrical energy into mechanical energy.
  • Most electric motors operate through the interaction between the motor's magnetic field and electric current in a wire winding to generate force in the form of rotation of a shaft.
  • An electric generator (Dynamo) is mechanically identical to an electric motor, but operates in the reverse direction, converting mechanical energy into electrical energy.
  • An uninterruptible power supply (UPS), also known as a battery backup, provides backup power when your regular power source fails, or voltage drops to an unacceptable level.
  • A UPS allows for the safe, orderly shutdown of a computer and connected equipment.
  • SMPS stands for switch-mode power supply. Its job is to convert wall-voltage AC power to lower voltage DC power.
  •  Most computer chips in modern computers require power generally of 1.2 - 3.3V, with some older devices requiring between 5 - 12V DC.
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