Mechanical Engineering Thermodynamics – Set 22

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Q1. A process, in which the gas is heated or expanded in such a way that the product of its pressure and volume remains constant, is called

(A) Isothermal process
(B) Hyperbolic process
(C) Adiabatic process
(D) Polytropic process

Answer: (B) Hyperbolic process

Q2. Which of the following has the minimum atomic mass?

(A) Oxygen
(B) Sulphur
(C) Nitrogen
(D) Carbon

Answer: (D) Carbon

Q3. Which of the following gas is mostly used in town for street and domestic lighting and heating?

(A) Producer gas
(B) Coal gas
(C) Mond gas
(D) Coke oven gas

Answer: (B) Coal gas

Q4. The entropy may be expressed as a function of

(A) Pressure and temperature
(B) Temperature and volume
(C) Heat and work
(D) All of these

Answer: (A) Pressure and temperature

Q5. Select the wrong statement

(A) A Joule cycle consists of two constant volume and two isentropic processes.
(B) An Otto cycle consists of two constant volume and two isentropic processes.
(C) An Ericsson cycle consists of two constant pressure and two isothermal processes.
(D) All of the above

Answer: (A) A Joule cycle consists of two constant volume and two isentropic processes.

Q6. Which of the following is an intensive property of a thermodynamic system?

(A) Volume
(B) Temperature
(C) Mass
(D) Energy

Answer: (B) Temperature

Q7. When coal is first dried and then crushed to a fine powder by pulverizing machine, the resulting fuel is called

(A) Wood charcoal
(B) Bituminous coal
(C) Briquetted coal
(D) None of these

Answer: (D) None of these

Q8. 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

Answer: (B) Less than Carnot cycle

Q9. In an isothermal process,

(A) There is no change in temperature
(B) There is no change in enthalpy
(C) There is no change in internal energy
(D) All of these

Answer: (D) All of these

Q10. The heating of a gas at constant pressure is governed by

(A) Boyle’s law
(B) Charles’ law
(C) Gay-Lussac law
(D) Avogadro’s law

Answer: (B) Charles’ law

Q11. According to Avogadro’s law

(A) The product of the gas constant and the molecular mass of an ideal gas is constant
(B) The sum of partial pressure of the mixture of two gases is sum of the two
(C) Equal volumes of all gases, at the same temperature and pressure, contain equal number of molecules
(D) All of the above

Answer: (C) Equal volumes of all gases, at the same temperature and pressure, contain equal number of molecules

Q12. The air standard efficiency of an Otto cycle is given by (where r = Compression ratio, and γ = Ratio of specific heats)

(A) 1 – rγ – 1
(B) 1 + rγ – 1
(C) 1 – (1/ rγ – 1)
(D) 1 + (1/ rγ – 1)

Answer:(C) 1 – (1/ rγ – 1)

Q13. The behavior of super-heated vapour is similar to that of

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

Answer: (A) Perfect gas

Q14. One kg of ethylene (C2H4) requires 2 kg of oxygen and produces 22/7 kg of carbon dioxide and __ kg of water or steam.

(A) 9/7
(B) 11/7
(C) 7/4
(D) 11/4

Answer: (A) 9/7

Q15. The efficiency of the dual combustion cycle for the same compression ratio is __ Diesel cycle.

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

Answer: (A) Greater than

Q16. The mass of carbon per kg of flue gas is given by

(A) (11/3) CO2 + (3/7) CO
(B) (3/7) CO2 + (11/3) CO
(C) (7/3) CO2 + (3/11) CO
(D) (3/11) CO2 + (7/3) CO

Answer:(A) (11/3) CO2 + (3/7) CO

Q17. In an irreversible process, there is a

(A) Loss of heat
(B) No loss of heat
(C) Gain of heat
(D) No gain of heat

Answer: (A) Loss of heat

Q18. The gas constant (R) is equal to the __ of two specific heats.

(A) Sum
(B) Difference
(C) Product
(D) Ratio

Answer:(B) Difference

Q19. The compression ratio is the ratio of

(A) Swept volume to total volume
(B) Total volume to swept volume
(C) Swept volume to clearance volume
(D) Total volume to clearance volume

Answer: (D) Total volume to clearance volume

Q20. In an extensive property of a thermodynamic system

(A) Extensive heat is transferred
(B) Extensive work is done
(C) Extensive energy is utilized
(D) None of these

Answer: (D) None of these

Q21. The thermodynamic difference between a Rankine cycle working with saturated steam and the Carnot cycle is that

(A) Carnot cycle can’t work with saturated steam
(B) Heat is supplied to water at temperature below the maximum temperature of the cycle
(C) A Rankine cycle receives heat at two places
(D) Rankine cycle is hypothetical

Answer: (B) Heat is supplied to water at temperature below the maximum temperature of the cycle

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