Description : Water boils when: A. Its saturated vapor pressure equals to the atmospheric pressure B. Its vapor pressure equals 76cm of mercury C. Its temperature reaches 212 degree Celsius D. Its vapor pressure is 1 gram per sq. cm
Last Answer : Its saturated vapor pressure equals to the atmospheric pressure
Description : A 0.064 kg of octane vapor (MW = 114) is mixed with0.91 kg of air (MW = 29.0) in the manifold of an Engine. The total pressure in the manifold is 86.1 kPa, and a temperature is 290 K. assume octane behaves ideally. What is ... of the air in the mixture in KPa? a. 46.8 b. 48.6 c. 84.6 d. 64.8
Last Answer : 84.6
Description : What is defined as the quantity of heat needed to raise the temperature of one kilogram of water by one degrees Celsius? a. Kilojoule b. Btu c. Kilocalorie d. Latent heat
Last Answer : Kilocalorie
Description : What horse power is required to isothermally compress 800 ft^3 of Air per minute from 14.7 psia to 120 psia? A. 28 hp B.108 hp C.256 hp D.13900 hp Formula: W= p1V1 ln (p1/p2) Power = dW / dt
Last Answer : 108 hp
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 : ____________is the difference between the saturation temperature for the given pressure and the actual sub cooled liquid temperature. a) Degrees of Superheat, °SH b) Degrees of Sub cooled, °SB c) Both a and b d) None of the above
Last Answer : Degrees of Sub cooled, °SB
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 car whose mass is 2 metric tons is accelerated uniformly from stand hill to 100 kmph in 5 sec. Find the driving force in Newton’s. a. 11,120 N b. 11,320 N c. 11,420 N d. 11520 N formula: F= ma / k
Last Answer : 11,120N
Description : A temperature scale whose zero point is absolute zero, the temperature of “0” entropy at which all molecular motion stops. a. Celsius b. Fahrenheit c. Kelvin d. Rankine
Last Answer : Kelvin
Description : _____________ is the base unit of thermodynamics temperature. a) Celsius b) Fahrenheit c) Kelvin d) None of the above
Description : The volume of an ideal gas is directly proportional to its a. pressure b. Celsius temperature c. Kelvin temperature d. Fahrenheit temperature
Last Answer : Kelvin temperature
Description : What is the Si unit for temperature? a. Kelvin b. Celsius c. Fahrenheit d. Rankine
Description : Which of the following is standard temperature and pressure (STP)? A. 0 degree Celsius and one atmosphere B. 32 degree Fahrenheit and zero pressure C. 0 degree Kelvin and one atmosphere D. 0 degree Fahrenheit and zero pressure
Last Answer : 0 degree Celsius and one atmosphere
Description : What refers to the amount of heat needed to raise the temperature of an object by one degree Celsius or 1K? A. Heat capacity B. Specific heat C. Latent heat D. Molar heat
Last Answer : Heat capacity
Description : What is the thermodynamic temperature scale in the English system? A. Kelvin scale B. Celsius scale C. Fahrenheit scale D. Rankine scale
Last Answer : Rankine scale
Description : What is the thermodynamic temperature scale in the SI system? A. Kelvin scale B. Celsius scale C. Fahrenheit scale D. Rankine scale
Last Answer : Kelvin scale
Description : The unit of temperature in S.I. units is (a) Centigrade (b) Celsius (c) Fahrenheit (d) Kelvin (e) Rankine.
Last Answer : Answer : d
Description : _________ is the quantity of heat required to raise the temperature of one pound of water 1 F˚ from 63 ˚F to 64 ˚F. a. one Joule b. one calorie c. one watt d. one BTU
Last Answer : one BTU
Description : Two masses, one of the 10kg and the other unknown, are placed on a scale in a region where g = 9.67 m/sec2 . The combined weight of these two masses is 174.06 N. Find the unknown mass in kg. a. 20 kg b. 19 kg c. 18 kg d. 17 kg formula: m=Fg k / g
Last Answer : 18 kg
Description : Developed the centigrade or Celsius a. Andres Celsius b. Anders Celsius c. Andrew Celsius d. Anthony Celsius
Last Answer : Anders Celsius
Description : When was the Ninth General Conference on Weights and Measures decided to abandon centigrade and used Celsius Instead? a. 1950 b. 1936 c. 1957 d. 1948
Last Answer : 1948
Description : A problem Drum ( 3 ft. diameter ; 6 ft. height ) is field with a fluid whose density is 50 lb/ft^3. Determine the total volume of the fluid. A. 42.41 ft^3 B.44.35 ft^3 C.45.63 ft^3 D.41.23 ft^3 Formula: Vf = (pi d^2 h) / 4
Last Answer : 42.41 ft^3
Description : A gas having a volume of100 ft³ at 27ºC is expanded to 120 ft³by heated at constant pressure to what temperature has it been heated to have this new volume? a. 87°C b. 85°C c. 76°C d. 97°C t2= T2–T1
Last Answer : 87°C
Description : Find the change in internal energy of 5 lb. of oxygen gas when the temperature changes from 100 ˚F to 120 ˚F. CV = 0.157 BTU/lbm-˚R A.14.7 BTU B.15.7 BTU C. 16.8 BTU D. 15.9 BTU Formula: U= mcv T
Last Answer : 15.7 BTU
Description : _____________ is the difference between the actual temperature of superheated vapor and the saturation temperature for the existing pressure. a) Degrees of Superheat, °SH b) Degrees of Sub cooled, °SB c) Both a and b d) None of the above
Last Answer : Degrees of Superheat, °SH
Description : Water (specific heat cv= 4.2 kJ/ kg ∙ K ) is being heated by a 1500 W h eater. What is the rate of change in temperature of 1kg of the water? A. 0.043 K/s B. 0.179 K/s C. 0.357 K/s D. 1.50 K/s Formula: Q = mcv ( T)
Last Answer : 0.179 K/s
Description : Convert the change of temperature from 20˚C to 30˚C to Kelvin scale. a. 10 K b. 293 K c. 303 K d. 273 K
Last Answer : 10 K
Description : If ethyl alcohol boils at 79 degrees Celsius a physical or chemical change?
Last Answer : Feel Free to Answer
Description : The value for the ΔU of a system is -120 J. If the system is known to have absorbed 420 J of heat, how much work was done? a. -540 J b. -640 J c. -740 J d. -840 J formula: ΔU = q +w
Last Answer : -540 J
Description : The _________ is defined as the amount of heat required to change the temperature of 1 gram of water by 1 Celsius degree. a. specific heat b. latent heat c. Joule d. calorie
Last Answer : calorie
Description : What refers to a liquid whose temperature is lower than saturation temperature corresponding to the existing pressure? a. Subcooled liquid b. Saturated liquid c. Pure liquid d. Compressed liquid
Last Answer : Subcooled liquid
Description : __________________ represents the highest pressure and highest temperature at which liquid and vapor can coexist in equilibrium. a) Critical Point b) Boiling Point c) Quality Point d) None of the above
Last Answer : Critical Point
Description : __________________ is a liquid at the saturations which has temperature equal to the boiling point corresponding to the existing pressure. a. Saturation Temperature b. Sub cooled Liquid c. Compressed Liquid d. Saturated Liquid
Last Answer : Saturated Liquid
Description : _________________ is one which has a pressure higher than the saturation pressure corresponding to the existing temperature. a. Saturation Temperature b. Sub cooled Liquid c. Compressed Liquid d. Saturated Liquid
Last Answer : Compressed Liquid
Description : ________________ is one which has a temperature lower than the saturation temperature corresponding to the existing pressure. a. Saturation Temperature b. Sub cooled Liquid c. Compressed Liquid d. Saturated Liquid
Last Answer : Sub cooled Liquid
Description : ______________ is the temperature at which liquids start to boil or the temperature at which vapors begin to condense. a. Saturation Temperature b. Sub cooled Liquid c. Compressed Liquid d. Saturated Liquid
Last Answer : Saturation Temperature
Description : Mixture of liquid and steam of the same substance in which both are at saturation temperature. a. dry steam b. current steam c. wet steam d. aerosol
Last Answer : wet steam
Description : Which is NOT a correct statement? A. A superheated vapor will not condense when small amount of heat re removed B. An ideal gas is a gas that is not a superheated vapor C. A saturated ... absorb as much heat as it can without vaporizing D. Water at 1 atm and room temperature is subcooled
Last Answer : An ideal gas is a gas that is not a superheated vapor
Description : While swimming a depth of 13m in a fresh water lake a fish emits an air bubble of volume 2 mm² atmospheric pressure is 100kpa what is the original pressure of the bubble. a. 217.17 kpa b. 119 kpa c. 326.15 kpa d. 210 kap Pabs = Pg + Patm
Last Answer : 217.17 kpa
Description : A simple steam engine receives steam from the boiler at 180˚C and exhausts directly into the air at 100˚C. What is the upper limit of its efficiency? a. 11.28 % b. 36.77 % c. 20.36 % d. 17.66 %
Last Answer : 17.66 %
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 : 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 : Steam is throttled to 0.1 MPa with 20 degrees of superheat. (a) What is the quality of throttled steam if its pressure is 0.75 MPa (b) What is the enthalpy of the process? a) 97.6%,2713 kJ/kg b) -97.6%, 2713 kJ/kg c) 87.6%,3713 kJ/kg d) -87.6%, 3713 kJ/kg
Last Answer : 97.6%,2713 kJ/kg
Description : The total energy of a molecule is shared equally by the various degrees of freedom possessed by it. This law is known as A. law of equipartition of energy B. law of conservation of energy C. law of degradation of energy D. none of these
Last Answer : Answer: A
Description : Which of the following gas has a minimum molecular mass? A. Oxygen B. Nitrogen C. Hydrogen D. Methane
Last Answer : Answer: C
Description : Specific heat capacity in SI unit. a. kJ / kg.k b. kJ / kg c. kN / kg d. None of the above
Last Answer : kJ / kg.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 : For a certain gas R = 320 J/kg.K and cv= 0.84kJ/kg.K. Find k? a. 1.36 b. 1.37 c. 1.38 d. 1.39 formula: k= R / cv+1
Last Answer : 1.38
Description : 212 °C = _____ K a. 485 b. 435 c. 498 d. None of the above
Last Answer : 485
Description : The combined mass of car and passengers travelling at 72 km/hr is 1500 kg. Find the kinetic energy of this combined mass. (Formula: K =mv2 / 2k ) a. 300 kJ b. 200 kJ c. 500 kJ d. None of the above
Last Answer : 300 kJ