This question was asked inGPSC AE (Electrical) Class-2 R&B Department Paper 2025 – Series MQuestion 118 of 179 published · Gujarat Public Service CommissionOpen paper
Q238EasyLoad Curves & Tariffs

Which of the following is called as cold reserve?

Answer & step-by-step solution
Correct answer: A. Reserve capacity available but not ready for use
Quick explanation

Cold reserve is generating capacity that exists but is not ready for immediate use; it requires startup and synchronization before it can carry load. This contrasts with spinning/hot reserve, which is already running or immediately available.

Cold reserve → offline/not immediately ready Spinning reserve → synchronized and quickly available

Concept & Reasoning

Reserve terminology is based on response readiness. Spinning reserve is synchronized and can pick up load quickly. Hot/warm reserve is closer to service. Cold reserve may be shut down and needs substantial startup time. Therefore 'available but not ready for use' is the defining description.

How to Solve It in the Exam

Cold = not running/ready.

Important Exam Point

Don't confuse reserve capacity with excess load already being carried.

Quick Trick

Cold = not running/ready.

Common Mistake

Selecting 'connected to bus and ready'—that describes spinning reserve.

Solution diagram – Which of the following is called as cold reserve?
Exam tipDon't confuse reserve capacity with excess load already being carried.
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