It is well known that the thermal efficiency of heat engines increases as the temperature of the energy source increases. in an attempt to improve the efficiency of a power plant, somebody suggests transferring heat from the available energy source to a higher-temperature medium by a heat pump before energy is supplied to the power plant. what do you think of this suggestion? explain.

The suggestion is wrong.

Explaination:

This is because the increase in the work produced will equal the work consumed by the heat pump. In real live, the work consumed by the heat pump is always more than the additional work produced, resulting to a decrease in thermal efficiency of the power plant.

the equation above shows how temperature f, measured in degrees fahrenheit, relates to a temperature c, measured in degrees celsius. based on the equation, which of the following must be true?

a temperature increase of 1 degree fahrenheit is equivalent to a temperature increase of

5

9

degree celsius.

a temperature increase of 1 degree celsius is equivalent to a temperature increase of 1.8 degrees fahrenheit.

a temperature increase of

5

9

degree fahrenheit is equivalent to a temperature increase of 1 degree celsius.

a) i only

b) ii only

c) iii only

d) i and ii only