Elements_03

50問 • 1年前

Jacky Shane Luyas Buhia

通報

問題一覧

At critical point the latent enthalpy of vaporization is

B. Zero

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

A pressure of 1 millibar is equivalent to:

A. 1000 dynes/cm²

Work done per unit charge when charge is moved from one to another point:

B. Potential at a point

How many independent properties are required to completely fix the equilibrium state of a pure gaseous compound?

B. 2

Which of the following relations define enthalpy?

B. h = u + pV

Which of the following is true for water at a reference temperature where enthalpy is zero?

A. Internal energy is negative

On what plane is the Mollier diagram plotted?

C. h-s

The compressibility factor z, is used for predicting the behavior of non - ideal gases. How is the compressibility factor defined relative to an ideal gas? (subscript c refers to critical value).

B. z = PV/RT

How is the quality x of a liquid-vapor mixture defined?

C. The fraction of the total mass that is saturated vapor

What is the expression for heat of vaporization?

C. hg - hf

What is the value of the work done for a closed, reversible, isometric system?

A. Zero

What is the equation for the work done by a constant temperature system?

C. W = MRT ln (V2/V1)

What is true about the polytropic exponent n for a perfect gas undergoing an isobaric process?

D. n = 0

How does an adiabatic process compare to an isentropic process?

D. Both: Heat transfer = 0; Isentropic: Reversible

During an adiabatic, internally reversible process, what is true about the change in entropy?

A. It is always zero

For an irreversible process, what is true about the change in entropy of the system and surroundings?

C. ds > 0

For which type of process does the equation dQ = Tds hold?

B. Reversible

Which of the following is true for any process?

D. ∆S (Surrounding) + ∆S (system) ≥ 0

Which of the following thermodynamic cycle is the most efficient?

C. Carnot

The ideal reversible Carnot cycle involves four basic processes. What type of processes are they?

D. Two isothermal and two isentropic

What is the temperature difference of the cycle if the entropy difference is ∆S, and the work done is W ?

B. W / ∆S

Which of the following is not an advantage of a superheated, closed Rankine cycle over an open Rankine cycle?

D. Increased boiler life

Which of the following statements regarding Rankine cycle is not true?

D. In practical terms, the susceptibility of the engine materials to corrosion is not a key limitation on the operating efficiency

Which of the following is standard temperature and pressure (STP)

D. 0°C and 1 atm pressure

A substance is oxidized when which of the following occurs?

B. It loses electrons

Which of the following is not a unit of pressure?

B. kg / m-s

Which of the following is the definition of Joule?

A. Newton meter

Which of the following is the basis for Bernoulli's law for fluid flow?

B. The principle of conservation of energy

Equation of state for a single component can be any of the following except:

D. A mathematical expression defining a path between states

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

C. Properties

In any non quasi-static thermodynamic process, the overall entropy of an isolated system will

C. Increase only

Entropy is a measure of:

C. Randomness or disorder

Which of the following statements about entropy is false?

D. Entropy of a crystal at 0°F is zero

Work or energy can be a function of all of the following except:

C. Force and time

Energy changes are represented by all except which one of the following:

D. dQ / T

U + pV is a quantity called:

C. Enthalpy

In flow process, neglecting KE and PE changes, -∫vdP represents which item below?

B. Shaft work

Power may be expressed in units of

D. Btu / hr

Equilibrium condition exist in all except which of the following?

C. In a steady state flow process

In a closed system (with a moving boundary) which of the following represents work done during an isothermal process?

C. W = P1V1 ln V2/V1

A substance that exists, or is regarded as existing, as a continuoum characterized by a low resistance to flow and the tendency to assume the shape of its container.

A. Fluid

A substance that is homogeneous in composition and homogenous and invariable in chemical aggregation.

A. Pure substance

A substance whose state is defined by variable intensive thermodynamic properties.

B. Simple substance

A system in which there is no exchange of matter with the surrounding or mass does not cross its boundaries.

B. Closed system

A system that is completely impervious to its surrounding or neither mass nor energy cross its boundaries.

C. Isolated system

A system in which there is a flow of mass across its boundaries.

A. Open system

The properties that are dependent upon the mass of the system and are total values such as total volume and total internal energy.

B. Extensive properties

The properties that are independent of the mass of the system such as temperature, pressure, density and voltage.

A. Intensive properties

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問題一覧

At critical point the latent enthalpy of vaporization is

B. Zero

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

A pressure of 1 millibar is equivalent to:

A. 1000 dynes/cm²

Work done per unit charge when charge is moved from one to another point:

B. Potential at a point

How many independent properties are required to completely fix the equilibrium state of a pure gaseous compound?

B. 2

Which of the following relations define enthalpy?

B. h = u + pV

Which of the following is true for water at a reference temperature where enthalpy is zero?

A. Internal energy is negative

On what plane is the Mollier diagram plotted?

C. h-s

The compressibility factor z, is used for predicting the behavior of non - ideal gases. How is the compressibility factor defined relative to an ideal gas? (subscript c refers to critical value).

B. z = PV/RT

How is the quality x of a liquid-vapor mixture defined?

C. The fraction of the total mass that is saturated vapor

What is the expression for heat of vaporization?

C. hg - hf

What is the value of the work done for a closed, reversible, isometric system?

A. Zero

What is the equation for the work done by a constant temperature system?

C. W = MRT ln (V2/V1)

What is true about the polytropic exponent n for a perfect gas undergoing an isobaric process?

D. n = 0

How does an adiabatic process compare to an isentropic process?

D. Both: Heat transfer = 0; Isentropic: Reversible

During an adiabatic, internally reversible process, what is true about the change in entropy?

A. It is always zero

For an irreversible process, what is true about the change in entropy of the system and surroundings?

C. ds > 0

For which type of process does the equation dQ = Tds hold?

B. Reversible

Which of the following is true for any process?

D. ∆S (Surrounding) + ∆S (system) ≥ 0

Which of the following thermodynamic cycle is the most efficient?

C. Carnot

The ideal reversible Carnot cycle involves four basic processes. What type of processes are they?

D. Two isothermal and two isentropic

What is the temperature difference of the cycle if the entropy difference is ∆S, and the work done is W ?

B. W / ∆S

Which of the following is not an advantage of a superheated, closed Rankine cycle over an open Rankine cycle?

D. Increased boiler life

Which of the following statements regarding Rankine cycle is not true?

D. In practical terms, the susceptibility of the engine materials to corrosion is not a key limitation on the operating efficiency

Which of the following is standard temperature and pressure (STP)

D. 0°C and 1 atm pressure

A substance is oxidized when which of the following occurs?

B. It loses electrons

Which of the following is not a unit of pressure?

B. kg / m-s

Which of the following is the definition of Joule?

A. Newton meter

Which of the following is the basis for Bernoulli's law for fluid flow?

B. The principle of conservation of energy

Equation of state for a single component can be any of the following except:

D. A mathematical expression defining a path between states

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

C. Properties

In any non quasi-static thermodynamic process, the overall entropy of an isolated system will

C. Increase only

Entropy is a measure of:

C. Randomness or disorder

Which of the following statements about entropy is false?

D. Entropy of a crystal at 0°F is zero

Work or energy can be a function of all of the following except:

C. Force and time

Energy changes are represented by all except which one of the following:

D. dQ / T

U + pV is a quantity called:

C. Enthalpy

In flow process, neglecting KE and PE changes, -∫vdP represents which item below?

B. Shaft work

Power may be expressed in units of

D. Btu / hr

Equilibrium condition exist in all except which of the following?

C. In a steady state flow process

In a closed system (with a moving boundary) which of the following represents work done during an isothermal process?

C. W = P1V1 ln V2/V1

A substance that exists, or is regarded as existing, as a continuoum characterized by a low resistance to flow and the tendency to assume the shape of its container.

A. Fluid

A substance that is homogeneous in composition and homogenous and invariable in chemical aggregation.

A. Pure substance

A substance whose state is defined by variable intensive thermodynamic properties.

B. Simple substance

A system in which there is no exchange of matter with the surrounding or mass does not cross its boundaries.

B. Closed system

A system that is completely impervious to its surrounding or neither mass nor energy cross its boundaries.

C. Isolated system

A system in which there is a flow of mass across its boundaries.

A. Open system

The properties that are dependent upon the mass of the system and are total values such as total volume and total internal energy.

B. Extensive properties

The properties that are independent of the mass of the system such as temperature, pressure, density and voltage.

A. Intensive properties