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This set of Engineering Thermodynamics Multiple Choice Questions & Answers (MCQs) focuses on Engineering Thermodynamics Set 5
Q1 | The amount of heat absorbed by asystem at lower temperature is
- a) coeff. of performance
- b) efficiency
- c) work supplied
- d) refrigerating effect
Q2 | Tds equation is
- a) tds=cvdt + t
- b)
- c)
- d)
Q3 | In an ideal gas the partial pressure of a component is
- a) inversely proportional to the square of the molefraction
- b) directly proportional to the mole fraction
- c) inversely proportional to the mole fraction
- d) equal to the mole fraction
Q4 | The value of the univesal gas constant is
- a) 0.314 j/kg k
- b) 83.14 kj/kg k
- c) 848 kj/kg k
- d) 8.314 kj/kg k
Q5 | Choose the correct answer
- a) a perfect gas does not obey the law pv=rt
- b) a perfect gas obeys the law pv=rt & has constant specific heat
- c) a perfect gas obeys the law pv=rt but have variable specific heat capacities
- d) all of the above
Q6 | Boyle's law states that, when tempearture is constant, the volume of agiven mass of a perfect gas
- a) varies directly as the absolute pressure
- b) varies inversely as the absolute pressure
- c) varies as square of the absolute pressue
- d) does not vary with the absolute pressure
Q7 | Charle's law states that if any gas is heated at constant pressure, its volume
- a) changes directly as it absolute temperature
- b) changes inversely as its absolute temperature
- c) changes as square of the absolute temperature
- d) does not change with absolute temperature
Q8 | The equation of state of an ideal gas is a relationship between the variables:
- a) pressure & volume
- b) pressure & temperature
- c) pressure, volume & temperature
- d) none of the above
Q9 | Joule's law states that the specific internal energy of a gas depends only on
- a) the pressure of the gas
- b) the volume of the gas
- c) the temperature of the gas
- d) none of the above
Q10 | ………. Law states that equal volume of all gases, at the same temperature & pressure, contains equal number ofmolecules
- a) boyle\s
- b) gay-lussac
- c) avogadro
- d) charle\s
Q11 | The change of entropy is considered to be……… when heat is absorbed by the gas
- a) positive
- b) negative
- c) zero
- d) none of the above
Q12 | ………. Is one in which neither any heatenters nor leaves the system
- a) isochoric process
- b) isobaric process
- c) isentropic process
- d) isothermal process
Q13 | Entropy of the universe
- a) tends to zero
- b) tends to a minimum
- c) tends to a maximum
- d) none of the above
Q14 | A gas can never be liquid
- a) above criticaltemperature
- b) when it is diatomic
- c) when it is impure
- d) above roomtemperature
Q15 | Which of the following remains constant during an adiabatic expansion
- a) entropy
- b) temperature
- c) internal energy
- d) none of the above
Q16 | In which of the following processes thechange in internal energy of a gas is equal to the work done
- a) adiabatic process
- b) isothermal process
- c) constant volume process
- d) constant pressure process
Q17 | The specific heat of a gas is a function of
- a) temperature only
- b) temperature & pressure
- c) temperature & entropy
- d) temperature, pressure& entropy
Q18 | In a Carnot cycle which of the followingprocessez must be carried out at extremely slow speed?
- a) isothermal compression
- b) adiabatic expansion
- c) adiabatic compression
- d) none of the above
Q19 | In case of real gases, cp will be equal tocv
- a) at absolute zero
- b) at triple point
- c) at critical temperature
- d) above criticaltempeature
Q20 | The physical properties of a perfect gas are controlled by which of the followingvariables?
- a) volume
- b) temperature
- c) pressure
- d) all of the above
Q21 | Universal gas constant is defined as equal to product of the molecular weight of thegas &
- a) gas constant
- b) specific heat at constant volume
- c) specific heat a constant pressure
- d) ratio of two specific heats
Q22 | All engineering process, strictly speakingare
- a) reversible cycle
- b) irreversible
- c) quasti-static
- d) thermodynamically inequillibrium
Q23 | Isothermal, isobaric, isochoric & adiabatic processes, under ideal condition, are ….Processes
- a) thermodynamic
- b) stable
- c) dynamic
- d) quasi-static
Q24 | Change of entropy depends upon whichof the following?
- a) change of heat
- b) change of specific heats
- c) change of pressure &volume
- d) none of the above
Q25 | In a reversible adiabatic process headadded is equal to
- a) zero
- b) positive value
- c)
- d)