Description : Change in enthalpy in a closed system is equal to heat transferred if the reversible process takes place at constant (a) pressure (b) temperature (c) volume (d) internal energy (e) entropy.
Last Answer : Answer : a
Description : Change in enthalpy of a system is the heat supplied at (a) constant pressure (b) constant temperature (c) constant volume (d) constant entropy (e) N.T.P. condition.
Description : If value of n is infinitely large in a polytropic process pV” = C, then the process is known as constant (a) volume (b) pressure (c) temperature (d) enthalpy (e) entropy
Description : Which of the following is the property of a system (a) pressure and temperature (b) internal energy (c) volume and density (d) enthalpy and entropy (e) all of the above.
Last Answer : Answer : e
Description : What is the energy absorbed during chemical reaction under constant volume conditions? A. Entropy B. Ion exchange C. Enthalpy D. Enthalpy of reaction
Last Answer : Enthalpy
Description : The sum of internal energy (U) and the product of pressure and volume (p.v) is known as A. workdone B. entropy C. enthalpy D. none of these
Last Answer : Answer: C
Description : According to Avogadro's Hypothesis (a) the molecular weights of all the perfect gases occupy the same volume under same conditions of pressure and temperature (b) the sum of partial pressure of ... gases have two values of specific heat (e) all systems can be regarded as closed systems.
Description : According to kinetic theory of gases, the absolute zero temperature is attained when (a) volume of the gas is zero (b) pressure of the gas is zero (c) kinetic energy of the molecules is zero (d) specific heat of gas is zero (e) mass is zero.
Last Answer : Answer : c
Description : Steam at 1000 lbf/ft^2 pressure and 300˚R has specific volume of 6.5 ft^3/lbm and a specific enthalpy of 9800 lbf-ft/lbm. Find the internal energy per pound mass of steam. A.2500 lbf-ft/lbm B.3300 lbf-ft/lbm C.5400 lbf-ft/lbm D.6900 lbf-ft/lbm Formula: h= u+ pV u= h– pV
Last Answer : 3300 lbf-ft/lbm
Description : Change in internal energy in a closed system is equal to heat transferred if the reversible process takes place at constant (a) pressure (b) temperature (c) volume (d) internal energy (e) entropy.
Description : Entropy change depends on (a) heat transfer (b) mass transfer (c) change of temperature (d) thermodynamic state (e) change of pressure and volume.
Description : Composite property applicable to all fluids a. Entropy b. Enthalpy c. Specific Heat d. None of the above
Description : Which of the following occurs in a reversible polytrophic process? a. Enthalpy remains constant b. Internal energy does not change c. Some heat transfer occurs d. Entropy remains constant
Last Answer : Some heat transfer occurs
Description : According to first law of thermodynamics (a) work done by a system is equal to heat transferred by the system (b) total internal energy of a system during a process remains constant ( ... , enthalpy and entropy during a process remain constant (d) total energy of a system remains constant
Last Answer : Answer : d
Description : Gas being heated at constant volume is undergoing the process of. a. isometric b. specific heat c. enthalpy d. isothermal
Last Answer : isometric
Description : _____ is that property of a substance which remains constant if no heat enters or leaves the substance, while it does work or alters its volume, but which increases or diminishes should a small amount of heat enter or leave. a. Entrophy b. Enthalpy c. Specific Heat d. None of the above
Last Answer : Entrophy
Description : The first law of thermodynamics is based on which of the following principles? a. conservation of mass b. the enthalpy-entropy relationship c. action – reaction d. conservation of energy
Last Answer : conservation of energy
Description : A cylinder contains oxygen at a pressure of 10 atm and a temperature of 300 K. The volume of the cylinder is 10 liters. What is the mass of the oxygen in grams? Molecular weight (MW) of oxygen is 32 g/mole? a. 125.02 b. 130.08 c. 135.05 d. 120.04
Last Answer : 130.08 {(10atm)(10)(32)/(0.0821) (300K)}
Description : The heat supplied to the gaS at constant volume is (where m = Mass of gas, cv = Specific heat at constant volume, cp = Specific heat at constant pressure, T2 – T1 = Rise in temperature, and R = Gas constant) A. mR(T2 – T1) B. mcv(T2 – T1) C. mcp(T2 – T1) D. mcp(T2 + T1)
Last Answer : Answer: B
Description : The specific heat at constant volume is A. the amount of heat required to raise the temperature of unit mass of gas through one degree, at constant pressure B. the amount of heat required to raise ... to raise the temperature of 1 kg of water through one degree D. any one of the above
Description : The amount of heat required to raise the temperature of the unit mass of gas through one degree at constant volume, is called A.specific heat at constant volume B.specific heat at constant pressure C.kilo Joule D.none of these
Last Answer : Answer: A
Description : If heat be exchanged in a reversible manner, which of the following property of the working substance will change accordingly (a) temperature (b) enthalpy (c) internal energy (d) entropy (e) all of the above.
Description : The mass of one mole of a substance in grams is known as ______. A. Molar weight B. Molar mass C. Molar volume D. Molar constant
Last Answer : Molar mass
Description : According to which law, all perfect gases change in volume by l/273th of their original volume at 0°C for every 1°C change in temperature when pressure remains constant (a) Joule’s law (b) Boyle’s law (c) Regnault’s law (d) Gay-Lussac law (e) Charles’ law.
Description : Sum of the internal energy of a substance and the product of pressure and volume. a. Specific Heat b. Specific Gravity c. Isolated System d. Enthalpy
Description : What refers to the measure of the disorder present in a given substance or system? A. Enthalpy B. Entropy C. Heat capacity D. Molar heat
Last Answer : Entropy
Description : According to Gay-Lussac law for a perfect gas, the absolute pressure of given mass varies directly as (a) temperature (b) absolute (c) absolute temperature, if volume is kept constant ... , if temperature is kept constant (e) remains constant,if volume and temperature are kept constant.
Description : The absolute pressure of a given mass of a perfect gas varies inversely as its volume, when the temperature remains constant. This statement is known as Charles’ law. A. Yes B. No
Description : According to Gay-Lussac law, the absolute pressure of a given mass of a perfect gas varies __________ as its absolute temperature, when the volume remains constant. A. directly B. indirectly
Description : According to Avogadro's law A. the product of the gas constant and the molecular mass of an ideal gas is constant B. the sum of partial pressure of the mixture of two gases is sum of the ... all gases, at the same temperature and pressure, contain equal number of molecules D. all of the above
Description : Total heat of a substance is also known as (a) internal energy (b) entropy (c) thermal capacity (d) enthalpy (e) thermal conductance.
Description : Which of the following is the other term used for enthalpy-entropy diagram? a. Enthalpy diagram b. Mollier diagram c. Steam diagram d. Entropy chart
Last Answer : Mollier diagram
Description : Entropy is the measure of: a. The internal energy of a gas b. The heat capacity of a substance c. Randomness or disorder d. The change of enthalpy of a system
Last Answer : Randomness or disorder
Description : The change that the system that undergoes from one equilibrium state to another is known as a. oath b. process c. enthalpy change d. entropy change
Last Answer : process
Description : What is the measure of the energy that is no longer available to perform useful work within the current environment? a. enthalpy b. entropy c. internal energy d. latent heat
Last Answer : entropy
Description : What is known as the total heat and heat content at various times in the history? a. enthalpy b. entropy c. internal energy d. latent heat
Last Answer : enthalpy
Description : A state occurs in isentropic process a. The change in entropy is 0 b. The change in entropy is 1 c. The change in enthalpy is 0 d. The change in enthalpy is 1
Last Answer : The change in entropy is 0
Description : Regardless of the process, the change in enthalpy firm moles of ideal gas is a. Heat b. Enthalpy c. Entropy d. Density
Last Answer : Heat
Description : A function of state that is associated with disorder in the system and environment. a. enthalpy b. entropy c. law of diminishing return d. Lenz’ Law
Description : What is considered as the heat content of a system? A. Enthalpy B. Entropy C. Internal heat D. Molar heat
Description : Extensive property of a system is one whose value (a) depends on the mass of the system like volume (b) does not depend on the mass of the system, like temperature, pressure, etc. (c) is not ... the state (d) is dependent on the path followed and not on the state (e) is always constant.
Description : Intensive property of a system is one whose value (a) depends on the mass of the system, like volume (b) does not depend on the mass of the system, like temperature, pressure, etc. (c) is not ... on the state (d) is dependent on the path followed and not on the state (e) remains constant.
Last Answer : Answer : b
Description : The volume of a confined gas is held constant, the pressure is directly proportional to the absolute temperature. a. Charle’s Law b. Boyle’s Law c. Joule’s Law d. Specific Heat
Last Answer : Boyle’s Law
Description : What is constant for a substance that is considered “incompressible”? A. Specific volume of density B. Pressure C. Temperature D. All of the above
Last Answer : Specific volume of density
Description : What are the names given to constant temperature, constant pressure, constant volume, constant internal energy, constant enthalpy, and constant entropy processes.
Last Answer : Isothermal, isochroic, isobaric, free expression, throttling and adiabatic processes respectively.
Description : A system having a rigid boundary that energy, work and mass does not cross its boundaries a. Specific Heat b. Specific Gravity c. Isolated System d. Enthalpy
Last Answer : Isolated System
Description : The temperatures of the ideal gas temperature scale are measured by using a ______. A. Constant-volume gas thermometer B. Constant-mass gas thermometer C. Constant-temperature gas thermometer D. Constant-pressure gas thermometer
Last Answer : Constant-volume gas thermometer
Description : According to Avogadro's law, for a given pressure and temperature, each molecule of a gas (a) occupies volume proportional to its molecular weight (b) occupies volume proportional to its specific ... (d) occupies volume inversely proportional to its specific weight (e) occupies same volume.
Description : Is the amount of a substance that contains Avogadro’s number of atoms/molecules. a. mass b. matter c. gram-mole d. volume
Last Answer : gram-mole
Description : Universal gas constant is defined as equal to product of the molecular weight of the gas and (a) specific heat at constant pressure (b) specific heat at constant volume (c) ratio of two specific heats (d) gas constant (e) unity.