STG330 Chapter 5 wrap-up

A nozzle changes what type of energy?

• Kinetic

• Potential

• Magnetic

For an adiabatic turbine generating 5 MW, what could not enter or exit?

• Mass

• Heat

• Work

• Steam

A diffuser has a greater diameter at its outlet than it does at its inlet. That means that the flow

• speeds up

• slows down

• changes height

The boundary work done during an isometric process

• Zero

• Depends on the heat input

• Depends on the work output

• Depends on the specific heat of the gas

Liquids and solids cannot do boundary work; therefore, for liquids and solids...

• c_p=c_v

• c_p<c_v

• c_p could sometimes be less than c_v and sometimes be greater than c_v

Why do we use c_p for determining difference in enthalpy for ideal gases but c_v for determining difference in internal energy?

• Because c_p accounts for boundary work

• Because c_v accounts for boundary work

• Because h=u-Pv

• Because ideal gases are incompressible

When does E_in = E_out?

• Always

• For steady systems where ΔΕ=0

• For incompressible flow

• For ideal gases

Mass, energy, and volume are conserved properties: they can neither be created or destroyed.

• True

• False

Air at 80 C and 100 kPa flows into a duct where it is cooled to 25 C. If the flow is steady, that means...

• The mass flow rate in equals the mass flow rate out

• The volume flow rate in equals the volume flow rate out

• The energy inside the duct is always changing

• The flow is incompressible

You've been visited by the mythical beast, the Unit-corn. She tells you to...

• Check your units

• Love thy neighbor as thyself

• Get more sleep

• bring a calculator to Quiz 3