Mechanical Engineering Thermodynamics mcq – Set 01

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All questions answers in the last paragraph

Q1. The unit of energy in S.I. units is

(A) watt
(B) Joule
(C) joule/s
(D) joule/m

Q2. According to Dalton’s law, the total pressure of the mixture of gases is equal to

(A) Greater of the partial pressures of all
(B) Average of the partial pressures of all
(C) Sum of the partial pressures of all
(D) Sum of the partial pressures of all divided by average molecular weight

Q3. Superheated vapour behaves

(A) Exactly as gas
(B) As steam
(C) As ordinary vapour
(D) Approximately as a gas

Q4. The specific heat of water is

(A) 2.512
(B) 1.817
(C) 4.187
(D) None of these

Q5. 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 degradation of energy
(C) Law of conservation of energy
(D) None of these

Q6. The main cause for the irreversibility is

(A) Unrestricted expansion
(B) Mechanical and fluid friction
(C) Heat transfer with a finite temperature difference
(D) All of the above

Q7. Which of the following can be regarded as gas so that gas laws could be applicable, within the commonly encountered temperature limits?

(A) O₂, N₂, steam, CO₂
(B) O₂, N₂, water vapour
(C) SO₂, NH₃, CO₂, moisture
(D) O₂, N₂, H₂, air

Q8. Absolute zero pressure will occur

(A) At sea level
(B) When molecular momentum of the system becomes zero
(C) Under vacuum conditions
(D) At a temperature of 273°K

Q9. According to which law, all perfect gases change in volume by 1/273th of their original volume at 0°C for every 1°C change in temperature when pressure remains constant

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

Q10. If value of n is infinitely large in a polytropic process pVn = C, then the process is known as constant

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

Q11. Mond gas is obtained by

(A) Partial combustion of coal, coke, anthracite coal or charcoal in a mixed air steam blast
(B) Carbonisation of bituminous coal
(C) Passing steam over incandescent coke
(D) Passing air and a large amount of steam over waste coal at about 650°C

Q12. The measurement of a thermodynamic property known as temperature is based on

(A) First law of thermodynamics
(B) Second law of thermodynamics
(C) Zeroth law of thermodynamics
(D) None of these

Q13. No liquid can exist as liquid at

(A) 273°K
(B) Vacuum
(C) Zero pressure
(D) Centre of earth

Q14. Gases have

(A) Only one value of specific heat
(B) Two values of specific heat
(C) No value of specific heat
(D) Under some conditions one value and sometimes two values of specific heat

Q15. A perfect gas at 27°C is heated at constant pressure till its volume is double. The final temperature is

(A) 54°C
(B) 327°C
(C) 108°C
(D) 654°C

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