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Which of the following system is more reliable?

A. Hydroelectric power plant

B. Steam power plant

C. Combined operating steam and hydroelectric power plant

D. Diesel power plant

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C. Combined operating steam and hydroelectric power plant

The reliability of steam power plant depends upon the coal supply, that of hydroelectric power plant on stream flow. Due to greater diversity a combine operation of various types of power plant would be more reliable than individual steam or hydro power plant.

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