Define thermal efficiency of a steam plant

Q.  The thermal efficiency of a steam plant is defined as ________________.
- Published on 19 Nov 15

a. The ratio of heat equivalent of electrical output to the heat of combustion of coal.
b. The ratio of heat of combustion of coal to the heat equivalent of electrical output.
c. The ratio of heat equivalent of mechanical energy transmitted to the turbine shaft to the heat of combustion of coal.
d. The ratio of heat of combustion of coal to the heat equivalent of mechanical energy transmitted to the turbine shaft.

ANSWER: The ratio of heat equivalent of mechanical energy transmitted to the turbine shaft to the heat of combustion of coal.

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