Thermodynamics True or False

A purse substance can have a maximum of two unique phases in Equilibrium

False

For a thermodynamic cycle, the net amounts of energy transfer by heat and work are equal

False

For heat pumps, the coefficient of performance (y symbol) is always greater than or equal to one

False

If a closed system undergoes an increase in temperature, the ehat transfer must be positive

False

It is impossible for a pure substance to have two phases in equilibrium

False

Pressure, temmperature, and volume are each independent properties of simple compressible compounds

False

The Rankine degree is smaller temperature unit than the Kelvin degree

False

The net change in internal energy of a system undergoing a thermodynamic cycle is positive if it is a power cycle and negative if it is a heat pump cycle

False

Work is an extensive property, while work per kg is an intensive property

False

Thermal radiation can travel through a vacuum

IFalse

Volume is an extensive property, while volume per kg is an intensive property

T

A two-phase liquid- vapor mixture with equal masses of saturated liquid and saturated Vapor has a qualitiy of 0.5

True

A two-phase liquid-vapor mixture with equal volumes of saturated liquid and saturated vapor has a quality of 0.5

True

The ideal gas law breaks down for gasses at very high pressure

True

The rate of ehat transfer at steady state by conduction will be lower if a material's thermal conductivity is lower

True

The rate of heat transfer at steady state by conduction will be higher if a material's thermal conductivity is larger

True

The sign convention used in thermo dynamics is that work done by the system on the surroundings is positive

True

The sign convention used in this course is that work done by the system on the surrounding is positive

True

1 lbf - 1lbm (the pount force is equal to the pound mass)

false

If a closed system under a process for which the change in total energy is positive, the heat transfer must be positive

true