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In a Power Plant a reserve generating capacity which is in operation but not in service, is known as:

  • A.Hot reserve
  • B.Cold reserve
  • C.Spinning reserve
  • D.Firm power

Answer: A

The answer is Hot reserve.

Reserve capacity is classified by how ready it is. Hot reserve is generating capacity that is in operation, with the machines running and warm, but not in service, that is, not yet supplying load. It can take load at short notice.

Spinning reserve is capacity that is running and connected to the bus, ready to pick up load instantly. Cold reserve is capacity that is available for service but not in operation, so it needs time to start. Firm power is not a reserve at all: it is the power a station or system can guarantee to supply at all times.

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