MECC3-1

-Basic Concepts -Laws of Thermodynamics -Ideal Gas Laws -Processes of Ideal Gases -Gas Cycles -Properties of Pure Substance -Process of Two-Phase System

Btu

The amount of heat needed to raise the temperature of one Ib of that substance one degree Fahrenheit is:

polytropic

Thermodynamic process following the law PVn = constant:

100°C

212° F is equal to:

a point function

Mathematically, a thermodynamic property is which of the following?

Two isentropics and two constant pressure processes

Brayton cycle has:

water

The specific gravity of a substance is the ratio of its density to the density of:

enthalpy

Mechanical energy of pressure transformed into energy of heat:

Change in temperature = zero

Which of the following relations is not applicable in a free expansion process?

Third Law of Thermodynamics

The law that states entropy of all perfect crystalline solids is zero at absolute zero temperature.

fusion curve

In a P-T diagram of pure substance, the curve separating the solid phase from the liquid phase is:

Specific volume at inlet/Specific volume outlet

For steam nozzle, which of the following ratios will have the values less than unity?

one lb of water at 212°F to one Ib of steam at 212°F

The latent heat of vaporization is the amount of heat required to convert:

Kelvin-planck law

It is impossible to construct a heat engine that operates in a cycle and receives a given quantity of heat from a high temperature body and does equal amount of work. The above statement is known as:

Joule

One N-m is equal to one

Gases dissociate at higher temperatures.

Which is not correct for calculating air-standard efficiency?

thermodynamics

The theory of changing heat into mechanical work:

460° below zero on the Fahrenheit scale

Absolute zero is:

isometric

Gas being heated at constant volume is undergoing the process of:

Kinetic energy

Exhaust gases from an engine possess:

barometer

The instrument used to measure atmospheric pressure is:

The solid does not melt, the liquid does not boil and the gas does not condense.

The triple point of a substance is the temperature and pressure at which:

boiling point

The temperature at which its vapor pressure is equal to the pressure exerted on the liquid:

KE

If E is the efficiency and if K is the maximum kinetic energy attained, what is the actual kinetic energy?

temperature

Enthalpy of an ideal gas is a function only of:

Boyle's law

McLeod gauge used for low pressure measurement operates on the principle of:

Constant volume process

In the polytropic process we have PVn = constant, if the value of n is infinitely large, the process is called:

the heat transfer cannot exceed the work done

Based on the first law of thermodynamics, which of the following is wrong?

J/kg K

Specific heat capacity is an SI derived unit described as:

70% vapor and 30% liquid

In a two phase system, 30% moisture means:

reversed Joule cycle

A Ball-Coleman cycle is:

Two isothermal and two constant volume processes

A Sterling cycle has:

Ericsson cycle

Select the cycle that consists of two isothermal and constant volume processes?

thermocouple

An instrument commonly used in most Research and Engineering Laboratories because it is small and fast among the other thermometers:

internal energy

The sum of the energies of all molecules in a system, energies appear in several complex forms, is the:

1839 m/s

The RMS velocity of hydrogen gas at N.T.P. is approximately:

decrease

At 101.325 kPa, the boiling point of water is 100°C. If the pressure is decreased, the boiling temperature will

Volume process

If the value of n is definitely large in a polytropic PVn = C, then the process is called constant:

specific gravity

The ratio of the density of a substance to the density of some standard substance is called:

60°C

140°F is equivalent to:

one Ib of ice at 32°F to one Ib of water at 32°F

The latent heat of fusion is the amount of heat required to convert:

equal to change in enthalpy

When changes in kinetic energy of a compress gas are negligible or insignificant, the work input to an adiabatic compressor is:

sublimation

The changing of solid directly to vapor, without passing through the liquid state is called:

heat

What is the area of the diagram from the relation of temperature and entropy plane?

fusion

The heat required to change a substance from solid to liquid state without change the temperature is latent heat of:

zero

An ideal gas is compressed isothermally. The enthalpy change is:

Densities less than about 0.8 times the critical density

The Beattie-Bridgeman equation of state is quite accurate in cases of:

one meter

One Joule of work is done by a force of one Newton acting through a distance of:

Newton

SI unit of force:

shaft work

In the flow process, neglecting KE and PE changes,  v dP represents:

zero

The entropy of a substance at a temperature of absolute zero is: