Thermo Test 1

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For liquid vapor mixture, the temperature and the pressure are known. The number of additional intensive, independent properties needed to fix the state of this system is _____ ?

1

1.8 J per degree C is equal to ____

1 J per degree F

50 C difference is equal to ______?

50 * 1.8 R difference

According to the 1st law, for all adiabatic processes between two specified states of a closed system, the net work done is______?

Always the same

Near ______, the ideal gas assumption for water vapor yields unacceptable errors.

Critical Point

Which one is NOT always correct for solids and liquids? (the density or specific volume is essentially constant during a process)

Delta H-liquid = Delta U-liquid

What pair of properties in the following are two independent intensive properties?

Density and pressure

A piston-cylinder device undergoes a process in which Change in U = U-final - U-initial = Q/2. This process results in system boundaries that --------?

Expand

All real gases deviate to some extent from the ideal gas law. For which of the following conditions are the deviations smallest?

High temperature and low pressures

Mechanical Energy refers to _____

Kinetic Energy + Potential Energy

Light-year has the dimension of __

Length

Critical point is the point at which _____?

Liquid vapor mixture is non-existant

Which one is NOT a mechanical form of work?

Magnetic work

Which of the following statements is the closest interpretation of the first law of thermodynamics for a closed system.

Net energy crossing the system boundary is the change in energy inside the system

An adiabatic process must be a process with _____?

No heat transfer

From textbook, whats the right procedure to determine compressibility factor Z for a gas with given T and P?

P-cr, T-cr --> P-r, T-r --> Z

For a system to be in thermodynamic equillibrium, which one of the following does not have to be the same everywhere?

Pressure

Which one of the following conclusions is NOT correct for cycles?

Q = Change in U

All of following properties have units, EXCEPT?

Reduced temperature

Which one is NOT an extensive property?

Specific Volume

In general which form of the same substance will hold the highest energy content?

Superheated Vapor

A system contains water at 2.00 MPa, 220 C. The phase of this water is _______.

Superheated Vapor (Temp Table A-4)

Compare T.f T.mixture and T.g at a given pressure for a liquid-vapor mixture?

T.f = T.mixutre = T.g

The compressed liquid properties strongly depend on ________?

Temperature

Boundary work, W-b, only exists in systems with moving boundaries, true or false.

True

For ideal gasses, u, h vary with temperature only, true or false.

True

Specific heat, C-p, is an intensive property, true or false.

True

Compare U.f, U.mixture, and U.g at a given temperature for a liquid-vapor mixture.

U.f < U.mixture < U.g

Which one is NOT a pure substance?

Water + Air

Which of the following is NOT an intensive property?

Work

Which one belongs to dynamic form of energy?

Work

In thermodynamics, positive work means ______ ?

Work done by a system

A container contains half liquid water by volume and half vapor by volume. Select the best estimate of the quality if the pressure is atmospheric?

X = 0.0006

Which one of the following statements is NOT correct about compressibility factor, Z?

Z reaches to unity when P reaches to P-critical

Boundary work requires?

a force acting on the boundary

In general, a system experiences no change in KE and PE during a process, this system must be ______

a stationary system

During melting process, a substance will _______ energy?

absorb

Which pair in the following has the closest properties at a given temperature?

compressed liquid and saturated liquid

The boundary work, W-b, is negative if the system experiences a _________ process.

compression

An ideal gas at a given state experiences following processes and eventually reaches to the same volume. For which case is the work done greater?

constant pressure process

What is the dominant heat transfer form in boiling a pot of water?

convection

Which of the following are NOT independent intensive properties?

density and specific volume

The properties of compressed liquid ________?

depend on temperature more than pressure

The First Law of thermodynamics states that _

energy can neither be created nor destroyed

At triple-point pressure and temperature, water _________?

exists in liquid-vapor-ice equilibrium

Which one of the following is NOT a point function

heat

Which case in the following has both volume flow rates and mass flow rates remain constant for an open system?

incompressible flow

The sum of all microscopic forms of energy is the ______ ?

internal energy

Which one of the following is NOT an intensive property?

internal energy

Which thermodynamic property in the following is the best measure of molecular activity on a substance?

internal energyy

A process with pressure held constant is so called an ____ process

isobaric

A process with Volume held constant is called an ______ process

isochoric

A hydraulic device is a device that uses liquids to transmit _____ equally from one point to another

pressure

The state of a thermodynamic system is always defined by its ___

properties

When the pressure of an ideal gas is doubled while the absolute temperature is halved, the volume is

quartered

We feel warm when we stay closer to a fireplace. This is due to ______ of the heat.

radiation

At constant temperature if P < P.sat the substance is in ___________ form

superheated vapor

All of the following statements about work done on or by a gas are true EXCEPT?

the differential of work is exact

What is the Zeoth law of thermodynamics about?

thermal equilibruim

Which one can best represent the "Flow Energy" for an open system?

u + Pv + V^2/2 +gz

The superheated vapor properties are ______ saturated vapor properties at a given Temperature?

very different from

All of the following statements about work done on or by a system are true EXCEPT:

work is possessed by the system


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