A boiler supplies (5000 mathrm{~kg}) of steam at 7 bar pressure and 0.98 dry. The feed water
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A boiler supplies \(5000 \mathrm{~kg}\) of steam at 7 bar pressure and 0.98 dry. The feed water temperature is \(40^{\circ} \mathrm{C}\) when using \(650 \mathrm{~kg} / \mathrm{h}\) of coal. The calorific value of coal is \(31 \mathrm{~mJ} / \mathrm{kg}\). Calculate
(a) the efficiency of boiler, and \((b)\) equivalent evaporation from and at \(100^{\circ} \mathrm{C}\).
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