Thermodynamics ELEMENTS

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 law of thermodynamics?

• Internal energy is due to molecular motion

• Entropy of the universe is increased by irreversible processes

• Energy can neither be created 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

• Dynes

• Pascal

• Psi

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

• Enthalpy

• Ideal gas

• Two phase states

• All pure substances

In the flow process, neglecting kinetic and potential energy, 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