In a counter flow heat exchanger, hot fluid enters at 170°C & leaves at 150°C, while the cold fluid enters at 50°C & leaves at 70°C. The arithmetic mean temperature difference in this case is __________ °C.

A. Grey cast iron B. White cast iron C. Malleable iron D. Graphite

A. 1.5 B. 3 C. 5 D. 7

A. Pulverised fuel B. Travelling grate stoker firing C. Circulating fluidised bed D. Fluidised bed

A. Induced stresses B. Density C. Elastic properties D. Thermal properties