Thermodynamics 1

Enthalpy of an ideal gas is a function only of ___________.

• entropy

• internal energy

• temperature

• pressure

Which of the following is the most efficient thermodynamic cycle?

• Brayton

• Otto

• Carnot

• Diesel

What is the first law of thermodynamics?

• internal energy is due to molecular motions

• entropy of the universe is increased by irreversible processes

• energy can neither be crated nor destroyed

• heat energy cannot be completely transformed into work

An ideal gas is compressed isothermally, what is the enthalpy change?

• always negative

• always positive

• zero

• undefined

Name the process that has no heat transfer.

• isothermal

• isobaric

• Polytropic

• adiabatic

An ideal gas is compressed in a cylinder so well insulated that there is essentially no heat transfer. The temperature of the gas

• decreases

• increases

• remain constant

• is zero

What is the SI unit of pressure?

• kg/cm²

• dynes/cm²

• Pascal

• Psi

The equation Cp = Cv + R applies to which of the following?

• enthalpy

• ideal gas

• two phase state

• all pure substances

In the flow process, neglecting kinetic and potential energies, the integral of Vdp represents what?

• heat transfer

• flow energy

• enthalpy change

• shaft work

Mechanical energy of pressure transformed into energy of heat.

• kinetic energy

• enthalpy

• heat exchanger

• heat of compression