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.
Last Answer : Answer : d
Description : An ideal gas whose specific heats are constant is called _____. A. Perfect gas B. Natural gas C. Artificial gas D. Refined gas
Last Answer : Perfect gas
Description : The ratio of two specific heats of air is equal to (a) 0.17 (b) 0.24 (c) 0.1 (d) 1.41 (e) 2.71.
Description : The index of compression n tends to reach ratio of specific heats y when (a) flow is uniform and steady (b) process is isentropic (c) process is isothermal (d) process ... specific heat does not change with temperature (e) process is isentropic and specific heat changes with temperature.
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.
Last Answer : Answer : a
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
Last Answer : Answer: C
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 ratio of specific heat at constant pressure (Cp) and specific heat at constant volume (cv) is A. equal to one B. less than one C. greater than one D. none of these
Description : The value of specific heat at constant pressure (cp) is __________ that of at constant volume (cv). A. less than B. equal to C. more than
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
Last Answer : Enthalpy
Description : The thermodynamic property of a system is said to be an intensive property whose value for the entire system __________ the sum of their value for the individual parts of the system. A. is equal to B. is not equal to
Description : Specific heat of air at constant pressure is equal to (a) 0.17 (b) 0.21 (c) 0.24 (d) 1.0 (e) 1.41
Last Answer : Answer : c
Description : If air is at pressure, p, of 3200 lbf/ft2 , and at a temperature, T, of 800 ˚R, what is the specific volume, v? (R=5303 ft-lbf/lbm-˚R, and air can be modeled as an ideal gas.) A.9.8 ft^3/lbm B.11.2 ft^3/lbm C.13.33 ft^3/lbm D.14.2 ft^3/lbm Formula: pv = RT v = RT / p
Last Answer : 13.33 ft^3/lbm
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 : Gas being heated at constant volume is undergoing the process of. a. isometric b. specific heat c. enthalpy d. isothermal
Last Answer : isometric
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 : Which law states that the specific heat of a gas remains constant at all temperatures and pressures (a) Charles’ Law (b) Joule’s Law (c) Regnault’s Law (d) Boyle’s Law (e) there is no such law.
Description : A certain gas, with cp = 0.529Btu/ lb. °Rand R = 96.2ft.lb/lb. °R, expands from 5 cu ft and 80°F to 15 cu ft while the pressure remains constant at 15.5psia. Compute for T2. a.1520°R b. 1620°R c. 1720°R d. 1820°R formula: T2= T1V2/V1
Last Answer : 1620°R
Description : A perfect gas has a value of R= 319.2 J/ kf.K and k= 1.26. If 120 kJ are added to 2.27 kf\g of this gas at constant pressure when the initial temp is 32.2°C? Find T2. a. 339.4 K b. 449.4 K c. 559.4K d. 669.4K formula: cp = kR/ k-1 Q= mcp(T2-T1)
Last Answer : 339.4 K
Description : A certain gas with cp = 0.529Btu/lb°R and R = 96.2ft/lbºR expands from 5 ft and 80ºF to 15 ft while the pressure remains constant at 15.5 psia. a. T2=1.620ºR, ∫H = 122.83 Btu b. T2 = 2°R, ∫H = 122.83 Btu c. ... , ∫H = 122.83 Btu d. T2 = 1°R, ∫H = 122.83 Btu T2= V2(t2)/V1 and ∫H = mcp (T2-T1)
Last Answer : T2=1.620ºR, ∫H = 122.83 Btu
Description : A certain gas, with cp = 0.529Btu/lb.°R and R = 96.2 ft.lb/lb.°R, expands from 5 cu ft and 80°F to 15 cu ft while the pressure remains constant at 15.5 psia. Compute for T2. (Formula: T2= T1V2/V1) a. 460°R b. 270°R c. 1620 °R d. None of the above
Last Answer : 1620 °R
Description : There are 1.36 kg of gas, for which R = 377 J/kg.k and k = 1.25, that undergo a nonflow constant volume process from p1 = 551.6 kPa and t1 = 60°C to p2 = 1655 kPa. During the process the gas is internally stirred and ... (Formula: T2= T1p2/ p1) a. 999 K b. 888 K c. 456 K d. One of the above
Last Answer : 999 K
Description : Twenty grams of oxygen gas are compressed at a constant temperature of 30 ˚C to 5%of their original volume. What work is done on the system. A.824 cal B.924 cal C.944 cal D.1124 cal Formula: W = -mRTln (V2/V1) Where R = (1.98 cal/gmole·K) (32 g/gmole)
Last Answer : 1124 cal
Description : In the equation Pv = RT, the constant of proportionality R is known as ______. A. Universal gas constant B. Gas constant C. Ideal gas factor D. Gas index
Last Answer : Gas constant
Description : The value of gas constant (R) in S. I. units is A. 0.287 J/kgK B. 2.87 J/kgK C. 28.7 J/kgK D. 287 J/kgK
Last Answer : Answer: D
Description : Helium ( R= 0.4698 BTU/lbm-˚R ) is compressed isothermally from 14.7 psia and 68 ˚F. The compression ratio is 1:4. Calculate the work done by the gas. A. –1454 BTU/lbm B. -364 BTU/lbm C.-187BTU/lbm D.46.7 BTU/lbm Formula: W = RT ln (V2/V1)
Last Answer : -364 BTU/lbm
Description : The gas constant of a certain gas is the ratio of: A. Universal gas constant to molar mass B. Universal gas constant to atomic weight C. Universal gas constant to atomic number D. Universal gas constant to number of moles
Last Answer : Universal gas constant to molar mass
Description : The universal gas constant of a gas is the product of molecular mass of the gas and the gas constant. A. Correct B. Incorrect
Description : The value of the product of molecular weight and the gas characteristic constant for all the gases in S.I. units is (a) 29.27 J/kmol°K (b) 83.14J/kmol°K (c) 848J/kmol°K (d) All J/kmol °K (e) 735 J/kmol °K.
Last Answer : Answer : b
Description : The value of the product of molecular weight and the gas characteristic constant for all the gases in M.K.S. unit is (a) 29.27 kgfm/mol°K (b) 8314kgfm/mol°K (c) 848kgfm/mol°K (d) 427kgfm/mol°K (e) 735 kgfm/mol°K.
Description : The gas constant is equal to a. Cp – Cv b. Cp + Cv c. Cp – Cv + k d. None of the above
Last Answer : Cp – Cv
Description : If a gas is heated against a pressure, keeping the volume constant, then work done will be equal to (a) + v (b) – ve (c) zero (d) pressure x volume (e) any where between zero and infinity.
Description : Characteristic gas constant of a gas is equal to (a) C/Cv (b) Cv/Cp (c) Cp – Cv (d) Cp + Cv (e) Cp x Cv
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 : 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
Description : The first law of thermodynamics may be expressed in the following equivalent a. the net heat transfer id equal to the network b. the sum of the total energy forms leaving the system boundary is ... neither be created nor destroyed but only converted from one form to another d. all of the above
Last Answer : all of the above
Description : “The total volume of a mixture of non-reacting gases is equal to the sum of the partial volumes.” This statement is known as ______. A. Law of Dulong and Petit B. Maxwell-Boltzmann law C. Amagat’s law D. Avogadro’s law
Last Answer : Amagat’s law
Description : According to Dalton's law, the total pres sure of the mixture of gases is equal to (a) greater of the partial pressures of all (b) average of the partial pressures of all (c) sum ... all (d) sum of the partial pressures of all divided by average molecular weight (e) atmospheric pressure.
Description : The prefix “iso” used to designate a process means ______. A. Cannot be interchanged B. Remains constant C. Approximately equal D. Slight difference
Last Answer : Remains constant
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 : From the steam table, determine the average constant pressure specific heat (c) of steam at 10 kPa and45.8 ˚C A.1.79 kJ/ kg-˚C B.10.28 kJ/ kg-˚C C.30.57 kJ/ kg-˚C D. 100.1 kJ/ kg-˚C Formula: h = c T ∆ ∆ From the steam table At 47.7 ˚C h= 2588.1 kJ/ kg At 43.8 ˚C h= 2581.1 kJ/ kg
Last Answer : 1.79 kJ/ kg-˚C
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 is a process during which the specific volume remains constant? A. Isobaric process B. Isothermal process C. Isochoric or isometric process D. Isovolumetric process
Last Answer : Isochoric or isometric process
Description : Which of the following parameters is constant for a mole for most of the gases at a given temperature and pressure (a) enthalpy (b) volume (c) mass (d) entropy (e) specific volume.
Description : Also called absolute humidity and specific humidity. a. Related humidity b. Humidity ratio c. Dew point d. Adiabatic ratio
Last Answer : Humidity ratio
Description : The ratio of the weight of a substance to the weight of some standard substance is called? a. Specific Heat b. Specific Gravity c. Isothermal d. Specific Weight
Last Answer : Specific Gravity
Description : Specific heat ratio is always a. > 1 b. < 1 c. = 1 d. none of the above
Last Answer : > 1
Description : The ratio of the change in energy in the form of the heat a. relative density b. specific heat c. specific gravity d. none of the above
Last Answer : specific heat
Description : Which of the following best describes heat? a. The capacity to do work b. Forces times distances c. Sum of thermal and chemical energy d. An energy transfer due to temperature difference
Last Answer : An energy transfer due to temperature difference