# Engineering Thermodynamics Questions And Answers – Set 24

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## 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
(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

(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

(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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