Elements_02

Jacky Shane Luyas Buhia · 20問 · 2年前

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問題一覧

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

C. Temperature

Which of the following is the most efficient thermodynamic cycle?

C. Carnot

What is the first law of thermodynamics?

C. Energy can either be created nor destroyed

An ideal gas is compressed isothermally. What is the enthalpy change?

C. Zero

Name the process that has no heat transfer.

D. Adiabatic

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

B. Increases

What is the SI unit of pressure?

C. Pascal

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

B. Ideal gas

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

D. Shaft work

Mechanical energy of pressure transformed into energy of heat.

B. Enthalpy

The theory of changing heat into mechanical work.

A. Thermodynamics

Average pressure on surface when a changing pressure condition exist.

D. Mean effective pressure

Which of the following cycles consist two isothermal and two constant volume processes?

C. Stirling cycle

A control volume refers to what?

A. A fixed region in space

In the polytropic process, PV^n = constant, if the value of n is infinitely large, the process is

B. Isometric

If the temperature is held constant and the pressure is increased beyond the saturation pressure, then the working medium must be:

A. Compressed liquid

Is one whose temperature is below the saturation temperature corresponding to its pressure:

D. Subcooled liquid

Number of molecules in a mole of any substance is a constant called:

B. Avogadro’s number

If the pressure of the gas is constant the volume is directly proportional to the absolute temperature.

C. Charles' law

The number of protons in the nucleus of an atom of the number of electrons in the orbit of an atom:

B. Atomic number

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

B. Fusion curve

A water temperature of 18 °F in the water cooled condenser is equivalent in °C to _________.

B. 10

The latent of vaporization in joules per kg is equal to:

C. 22.6 x 10⁵

Form of energy associated with the kinetic energy of the random motion of large number of molecules:

D. Heat

Is the condition of pressure and temperature at which a liquid and its vapor are indistinguishable:

A. Critical point

If the temperature is held constant and the pressure is increased beyond the saturation pressure, then, the working medium must be:

B. Compressed liquid

When the substance is gaseous is below the critical temperature is called:

A. Vapor

Superheated vapor behaves

D. approximately as a gas

Which of the following provides the basic for measuring thermodynamic property of temperature?

A. Zeroth Law of Thermodynamics

Which of the following is commonly used as liquid absorbent?

C. Ethylene glycol

Mechanism designed to lower the temperature of air passing through is:

A. Air cooler

A device for measuring the velocity of wind:

B. Anemometer

Heat normally flowing from a high temperature body to a low temperature body wherein it is impossible to convert heat without other effects is called the:

A. Second law of thermodynamics

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

C. Boiling point

A nozzle is used to

A. Increase velocity and decrease pressure

The sum of energies of all molecules in a system where energies appear in several complex form.

C. Internal energy

The total energy in a compressible or incompressible fluid flowing across any section in a pipeline is a function of:

D. Flow energy, kinetic energy, height above datum and internal energy

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

B. Specific gravity

Is one whose pressure is higher than the saturation pressure corresponding to its temperature:

B. Compressed liquid

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

C. Sublimation

Weight per unit volume is termed as:

C. Weight density

What is the SI unit of force?

B. Newton

The volume of a fluid passing a cross-section stream in unit time is called:

C. Discharge

What equation applies in the first law of thermodynamics for an ideal gas in a reversible open steady-state system?

D. Q – PdV = H₂ - H₁

A pressure of 1 millibar is equivalent to:

A. 1000 dynes/cm²

What is the process that has no heat transfer?

D. Adiabatic

Which of the engine is used for fighter bombers?

A. Turbojet

Exhaust gases from an engine posses:

B. Kinetic energy

What is the force which tends to draw a body toward the center about which it is rotating?

D. centripetal force

When a system deviates infinitesimally from equilibrium at very instant of its state, it is undergoing:

B. Quasi-static process

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