Description : The thermal radiation emitted by a blackbody heated to a given temperature. a. Gamma Radiation b. Black Body Radiation c. Electromagnetic Radiation d. Alpha Radiation
Last Answer : Black Body Radiation
Description : At Equilibrium, the radiation emitted must equal the radiation absorbed. a. Boyle’s Law b. Planck’s Law c. Kirchoff’s Law d. Joule’s Law
Last Answer : Kirchoff’s Law
Description : The radiation emitted by a body as a result of its temperature. a. Blackbody Radiation b. Thermal Inversion c. Thermionic Inversion d. Thermal Radiation
Last Answer : Thermal Radiation
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 : An engine operates between temperatures of 900°Kandr2 and another engine between T2 and 400°K For both to do equal work, value of T2 will be (a) 650°K (b) 600°K (c) 625°K (d) 700°K (e) 750°K.
Last Answer : Answer : a
Description : The efficiency of Joule cycle is A. greater than Carnot cycle B. less than Carnot cycle C. equal to Carnot cycle D. none of these
Last Answer : Answer: B
Description : The efficiency of Stirling cycle is __________ Carnot cycle. A. greater than B. less than C. equal to
Last Answer : Answer: C
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 : Archimedes principle states that a. when a body is inversed in a fluid, the fluid exerts a downward force on the body whose magnitude is equal to the weight of the displaced fluid b. ... fluid exerts a downward force on the body whose magnitude is lower than the weight of the displaced fluid.
Last Answer : when a body is inversed in a fluid, the fluid exerts a upward force on the body whose magnitude is equal to the weight of the displaced fluid.
Description : What is considered as a perfect absorber as well as a perfect emitter? A. Gray body B. Black body C. Real body D. White body
Last Answer : Black body
Description : The boundaries of a control volume, which may either real or imaginary is called _____. A. Control boundary B. Control system C. Interface D. Control surface
Last Answer : Control surface
Description : What predicts the approximate molar specific heat at high temperatures from the atomic weight? A. Third law of thermodynamics B. Law of Dulong and Petit C. Mollier diagram D. Pressure-enthalpy diagram
Last Answer : Law of Dulong and Petit
Description : For heat engine operating between two temperatures (T1>T2), what is the maximum efficiency attainable? A. Eff = 1 – (T2/T1) B. Eff = 1 - (T1/T2) C. Eff = T1 - T2 D. Eff = 1 - (T2/T1)^2
Last Answer : Eff = 1 – (T2/T1)
Description : The efficiency of a Carnot engine depends on (a) working substance (b) design of engine (c) size of engine (d) type of fuel fired (e) temperatures of source and sink.
Last Answer : Answer : e
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.
Last Answer : Answer : c
Description : An ideal gas as compared to a real gas at very high pressure occupies (a) more volume (b) less volume (c) same volume (d) unpredictable behaviour (e) no such correlation.
Description : It is the deposition of radiant energy as heat into an absorbing body. a. Radiation b. Ionization c. Convection d. Insolation
Last Answer : Insolation
Description : What refers to the rate of thermal radiation emitter per unit area of a body? A. Thermal conductivity B. Absorptivity C. Emissivity D. Emissive power
Last Answer : Emissive power
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 : 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 : During the adiabatic process, which of the following is the change in entropy? a. zero b. greater than zero c. less than zero d. infinity
Last Answer : zero
Description : During adiabatic, internally reversible process, what is true about the change in entropy? A. It is temperature-dependent B. It is always greater than zero C. It is always zero D. It is always less than zero
Last Answer : It is always zero
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 : If both Stirling and Carnot cycles operate within the same temperature limits, then efficiency of Stirling cycle as compared to Carnot cycle (a) more (b) less (c) equal (d) depends on other factors (e) none of the above.
Description : ______ of a Body is the absolute quantity of a matter in it. a. Mass b. Weight c. Density d. Volume
Last Answer : Mass
Description : A system is in ______ equilibrium if the temperature is the same throughout the entire system. A. Static B. Thermal C. Mechanical D. Phase
Last Answer : Thermal
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 : Utilizing the answer to the previous problem, estimate the overall or average increase in temperature ( ΔT) of the concrete roof from the energy absorbed from the sun during a12hour day. Assume that all of the radiation absorbed goes into ... °C b. 8.9°C c. 9.9°C d. 10.9°C formula: ΔQ = m c ΔT
Last Answer : 7.9 °C
Description : What device measures infrared radiation below? a. thermocouple b. thermopile c. thermodynamic device d. thermos
Last Answer : thermopile
Description : A process by which heat is transferred through a material without a bulk movement of the material. a. Convection b. Conduction c. Radiation d. Emission
Last Answer : Conduction
Description : An idealized perfect absorber and perfect emitter of radiation. a. elastic material b. transponder material c. Teflon d. blackbody
Last Answer : blackbody
Description : A process in which heat energy is transferred by the flow of fluid. a. Convection b. Conduction c. Radiation d. Sublimation
Last Answer : Convection
Description : _________ is the transition of a given substance from the solid to the gas phase with no intermediate liquid stage. a. Convection b. Conduction c. Radiation d. Sublimation
Last Answer : Sublimation
Description : In the process of radiation, energy is carried by electromagnetic waves. What is the speed of electromagnetic waves? A. 182,000 miles/second B. 184,000 miles/second C. 186,000 miles/second D. 188,000 miles/second
Last Answer : 186,000 miles/second
Description : What is sometimes known as the “Fourth-power law”? A. Kirchhoff’s radiation law B. Newton’s law of cooling C. Stefan-Boltzmann law D. Hess’s law
Last Answer : Stefan-Boltzmann law
Description : Thermal radiation is an electromagnetic radiation with wavelengths in _____ range. A. 1 to 100 µm B. 0.1 to 100 µm C. 0.1 to 10 µm D. 10 to 100 µm
Last Answer : 0.1 to 100 µm
Description : What refers to the transfer of energy between a solid surface and the adjacent fluid that is in motion? A. Conduction B. Convection C. Radiation D. Electrification
Description : How is heat transferred? A. By conduction B. By convection C. By radiation D. All of the above
Last Answer : All of the above
Description : What is the absorptivity of a black body? A. 0 B. 1 C. 0.5 D. 0.25
Last Answer : 1
Description : What is the emissivity of a black body? A. 0 B. 1 C. 0.5 D. 0.25
Description : Which of the following statements is TRUE for an ideal gas, but not for a real gas? A. PV = nRT B. An increase in temperature causes an increase in the kinetic energy of the gas C. The ... same as the volume of the gas as a whole D. No attractive forces exists between the molecule of a gas
Last Answer : PV = nRT
Description : Maximum amount of thermal radiation is emitted at all wavelengths at any specified temperature by a/an __________ body. (A) Grey (B) Black (C) Opaque
Last Answer : (A) Grey
Description : It is a region enclosed by specified boundaries, which may be imaginary, either fixed or moving a. Isolated system b. Open system c. System d. None of the above
Last Answer : System
Description : A system whose boundary does not allow the exchange of either matter or energy with the surrounding a. open system b. closed system c. isolated system d. none of the above
Last Answer : isolated system
Description : A device that violates either the first law of thermodynamics or the second law of thermodynamics is known as _____. A. Ambiguous machine B. Universal machine C. Perpetual-motion machine D. Unique machine
Last Answer : Perpetual-motion machine
Description : What is a process with identical end states called? A. Cycle B. Path C. Phase D. Either path or phase
Last Answer : Cycle
Description : The area under the temperatureentropy curve (T – s curve) of any thermodynamic process represents A. heat absorbed B. heat rejected C. either (a) or (b) D. none of these
Last Answer : C. either (a) or (b)
Description : The law of conservation of mass states that ______. a. mass is indestructible b. mass is destructible c. mass is indestructible d. none of the above
Last Answer : mass is indestructible
Description : 710°R= ______ °C a. 214 b. 121 c. 213 d. None of the above
Last Answer : 121
Description : 746 °R = ______ °F a. 254 b. 345 c. 286 d. None of the above
Last Answer : 286