# Mechanical Engineering Thermodynamics – Set 01

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(A) Temperature
(B) Pressure
(C) Volume
(D) All of these

## 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

Answer: (C) Sum of the partial pressures of all

## Q3. Superheated vapour behaves

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

Answer: (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. Which of the following is the property of a system?

(A) Pressure and temperature
(B) Volume and density
(C) Enthalpy and entropy
(D) All of the above

Answer: (D) All of the above

## Q6. In an isothermal process, the internal energy of gas molecules

(A) Increases
(B) Decreases
(C) Remain constant
(D) May increase/decrease depending on the properties of gas

## Q7. In a free expansion process

(A) Work done is zero
(B) Heat transfer is zero
(C) Both (A) and (B) above
(D) Work done is zero but heat increases

Answer: (C) Both (A) and (B) above

## Q8. Isochoric process is one in which

(A) Free expansion takes place
(B) Very little mechanical work is done by the system
(C) No mechanical work is done by the system
(D) All parameters remain constant

Answer: (C) No mechanical work is done by the system

## Q9. Carnot cycle efficiency is maximum when

(A) Initial temperature is 0°K
(B) Final temperature is 0°K
(C) Difference between initial and final temperature is 0°K
(D) Final temperature is 0°C

Answer: (B) Final temperature is 0°K

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

## Q11. According to Gay Lussac’s law for a perfect gas, the absolute pressure of given mass varies directly as

(A) Temperature
(B) Absolute temperature, if volume is kept constant
(C) Volume, if temperature is kept constant
(D) None of these

Answer: (B) Absolute temperature, if volume is kept constant

## Q12. Which of the following quantities is not the property of the system?

(A) Pressure
(B) Temperature
(C) Specific volume
(D) Heat

## Q13. The more effective way of increasing efficiency of Carnot engine is to

(A) Increase higher temperature
(B) Decrease higher temperature
(C) Increase lower temperature
(D) Decrease lower temperature

## Q14. The efficiency of Diesel cycle approaches to Otto cycle efficiency when

(A) Cut-off is decreased
(B) Cut-off is constant
(C) Cut-off is increased
(D) Cut-off is zero

## Q15. Stirling and Ericsson cycles are

(A) Reversible cycles
(B) Irreversible cycles
(C) Semi-reversible cycles

(A) 2
(B) 4
(C) 8
(D) 16

## Q17. 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

Answer: (D) O₂, N₂, H₂, air

## Q18. 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

Answer: (B) When molecular momentum of the system becomes zero

## Q19. 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