Mechanical Engineering Thermodynamics – Set 19

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Q1. Kerosene is distilled at

(A) 65° to 220°C
(B) 220° to 345°C
(C) 345° to 470°C
(D) 470° to 550°C

Answer: (B) 220° to 345°C

Q2. In closed cycle gas turbine, the air is compressed

(A) Isothermally
(B) Isentropically
(C) Polytropically
(D) None of these

Answer: (B) Isentropically

Q3. Reversed Joule cycle is known as

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

Answer: (B) Bell-Coleman cycle

Q4. 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

Answer: (B) Total energy of a system remains constant

Q5. 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

Answer: (C) Entropy

Q6. A close cycle gas turbine gives __ efficiency as compared to an open cycle gas turbine.

(A) Same
(B) Lower
(C) Higher
(D) None of these

Answer: (C) Higher

Q7. The molecular mass expressed in gram (i.e. 1 g – mole) of all gases, at N. T. P., occupies a volume of

(A) 0.224 liters
(B) 2.24 liters
(C) 22.4 liters
(D) 224 liters

Answer: (C) 22.4 liters

Q8. According to kinetic theory of gases, the velocity of molecules __ with the increase in temperature.

(A) Remains constant
(B) Increases
(C) Decreases
(D) None of these

Answer: (B) Increases

Q9. The ratio of molar specific heats for mono-atomic gas is

(A) 1
(B) 1.4
(C) 1.67
(D) 1.87

Answer: (C) 1.67

Q10. Which of the following is the extensive property of a thermodynamic system?

(A) Pressure
(B) Volume
(C) Temperature
(D) Density

Answer: (B) Volume

Q11. One kg of carbon monoxide requires __ kg of oxygen to produce 11/7 kg of carbon dioxide gas.

(A) 4/7
(B) 11/4
(C) 9/7
(D) All of these

Answer: (A) 4/7

Q12. 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

Answer: (A) Law of equipartition of energy

Q13. Carnot cycle has maximum efficiency for

(A) Petrol engine
(B) Diesel engine
(C) Reversible engine
(D) Irreversible engine

Answer: (C) Reversible engine

Q14. The specific heat at constant volume is

(A) The amount of heat required to raise the temperature of unit mass of gas through one degree, at constant pressure
(B) The amount of heat required to raise the temperature of unit mass of gas through one degree, at constant volume
(C) The amount of heat required to raise the temperature of 1 kg of water through one degree
(D) Any one of the above

Answer:(B) The amount of heat required to raise the temperature of unit mass of gas through one degree, at constant volume

Q15. In open cycle gas turbine plants

(A) The indirect heat exchanger and cooler is avoided
(B) Direct combustion system is used
(C) A condenser is used
(D) All of the above

Answer: (D) All of the above

Q16. The thermal efficiency of an ideal gas turbine plant is given by (where r = Pressure ratio)

(A) rγ – 1
(B) 1 – rγ – 1
(C) 1 – (1/r) γ/γ – 1
(D) 1 – (1/r) γ – 1/ γ

Answer: (D) 1 – (1/r) γ – 1/ γ

Q17. 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

Answer: (D) All of the above

Q18. 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

Answer: (B) Wood charcoal

Q19. The fuel mostly used in steam boilers is

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

Answer: (D) Non-coking bituminous coal

Q20. According to Avogadro’s law, the density of any two gases is __ their molecular masses, if the gases are at the same temperature and pressure.

(A) Equal to
(B) Directly proportional to
(C) Inversely proportional to
(D) None of these

Answer: (B) Directly proportional to

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