An offline UPS requires:

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ALP CBT 2 Electrician Previous Paper: Held on 23 Jan 2019 Shift 1
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  1. Inductor
  2. Capacitor
  3. Battery
  4. Resistor

Answer (Detailed Solution Below)

Option 3 : Battery
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Static transfer switch makes an online UPS different from offline UPS. 

The block diagrams of both the UPS are shown in the figure.

F1 U.B. N.J. 2-8-19 D 2

F1 U.B. N.J. 2-8-19 D 3

  • Offline UPS requires battery
  • Static transfer switches (STS) are such electrical devices which are used for very fast switching between electrical power sources.
  • It is used in UPS to immediately switch main power supply, to its stored backup power.
  • They perform instantaneous switching operations and thus supply immediate power to the load.
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