what is true about the coal-powered steam locomotive? A- it is an example of an external combustion engine. B- it’s an example of an internal combustion engine.

A large electrical power station generates 1400 MW of electricity with an efficiency of 31 %. a) How much heat does the power station need to generate this amount of electricity in one day? Qn = b) How much heat is exhausted to the environment in one day? Qc = J c) The exhaust heat is transferred to the ambient air at 15 °C. What is the change in entropy of the surrounding air in one day? AS = J/K %3D d) The heat driving the generators is in the form of superheated steam at 260 °C. If a Carnot engine had been used instead, what would it's efficiency be? Efficiency = e) How much work was lost (left undone) because a Carnot engine was not used? WCarnot Wactual = %3D

Consider two heat engines that take in the same amount of thermal energy from their hot reservoirs in each cycle, but send different amounts of thermal energy to their cold reservoirs in each cycle.  Which of the two engines is the more efficient one? a) The engine that sends less energy to the cold reservoir. b) The engine that sends more energy to the cold reservoir. c) Actually, their efficiencies would be the same.

Increasing the temperature of the hot reservoir of a Carnot-cycle engine will increase the efficiency of the engine. a) True b) False