Engineering Thermodynamics Questions And Answers – Set 24

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All questions answers in the last paragraph

Q1. The atomic mass of nitrogen is __ oxygen.

(A) Equal to
(B) Less than
(C) More than
(D) None of these

Q2. Reversed Joule cycle is known as

(A) Carnot cycle
(B) Bell-Coleman cycle
(C) Rankine cycle
(D) Stirling cycle

Q3. According to First law of thermodynamics,

(A) Total internal energy of a system during a process remains constant
(B) Total energy of a system remains constant
(C) Work-done by a system is equal to the heat transferred by the system
(D) Internal energy, enthalpy and entropy during a process remain constant

Q4. The property of a working substance which increases or decreases as the heat is supplied or removed in a reversible manner, is known as

(A) Enthalpy
(B) Internal energy
(C) Entropy
(D) External energy

Q5. When a perfect gas is expanded through an aperture of minute dimensions, the process is known as

(A) Isothermal process
(B) Adiabatic process
(C) Free expansion process
(D) Throttling process

Q6. The efficiency of the Carnot cycle may be increased by

(A) Increasing the highest temperature
(B) Decreasing the highest temperature
(C) Increasing the lowest temperature
(D) Keeping the lowest temperature constant

Q7. Which of the following statement is correct?

(A) The heat and work are boundary phenomena
(B) The heat and work represent the energy crossing the boundary of the system
(C) The heat and work are path functions
(D) All of the above

Q8. When wood is heated with a limited supply of air to a temperature not less than 280°C, the resulting fuel is

(A) Coke
(B) Wood charcoal
(C) Bituminous coal
(D) Briquetted coal

Q9. The fuel mostly used in steam boilers is

(A) Brown coal
(B) Peat
(C) Coking bituminous coal
(D) Non-coking bituminous coal

Q10. The root mean square velocity of the gas molecules is given by (where k = Boltzmann’s constant, T = Absolute temperature, and m = Mass of one molecule of a gas)

(A) √(KT/m)
(B) √(2KT/m)
(C) √(3KT/m)
(D) √(5KT/m)

Q11. For the same compression ratio, the efficiency of Diesel cycle is __ Otto cycle.

(A) Greater than
(B) Less than
(C) Equal to
(D) None of these

Q12. The oxygen atom is __ times heavier than the hydrogen atom.

(A) 2
(B) 8
(C) 16
(D) 32

Q13. The heat energy stored in the gas and used for raising the temperature of the gas is known as

(A) External energy
(B) Internal energy
(C) Kinetic energy
(D) Molecular energy

Q14. The heat absorbed or rejected by the working substance is given by (where ds = Increase or decrease of entropy, T = Absolute temperature, and dQ = Heat absorbed or rejected)

(A) δQ = T.ds
(B) δQ = T/ds
(C) dQ = ds/T
(D) None of these

Q15. The state of a substance whose evaporation from its liquid state is complete, is known as

(A) Vapour
(B) Perfect gas
(C) Air
(D) Steam

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