Heat

Question 1

carnot efficiency

Answer 1

heat to work conversion can never be 100% efficient

Question 2

mechanical energy will be absorbed by _____________ and convert to heat

Answer 2

the material being processed

Question 3

Close system

Answer 3

no mass or matter cross the boundary

Question 4

Open system

Answer 4

bothe energy and matter can cross the boundary

Question 5

Isothermal process

Answer 5

temperature of system is kept constant

pV = constant ; delta T = 0

Question 6

If the gas is being compressed, i.e. gaining internal energy, then heat will need to be________ to keep the
temperature constant.

Answer 6

removed

Question 7

adiabatic process

Answer 7

no energy crosses the boundary.

All the work of compression goes towards increasing the internal energy of the system

pV^y = constant; pV/ T = constant

Question 8

polytropic process

Answer 8

both an increase in the internal energy and an increase in the temperature.

pV^n = constant; pV/ T = constant

Question 9

Any energy lost as ____________ will not be recoverable for useful work purposes.

Answer 9

frictional heat loss

Question 10

reversible change

Answer 10

change taking place such that the properties hardly change by more than an infinitesimal amount from one
instance to another

implies a very slow compression or expansion

Question 11

Compressing a gas or heating a gas will

Answer 11

increase the internal energy.

Question 12

A change in internal energy takes place when

Answer 12

there is a temperature change