Are you guys looking for Mechanical Engineering MCQ Questions with Answers PDF Free Download as per Mechanical Engineering new exam pattern? You came to the right page. This may assist you to understand and check your knowledge about the Subjects. Students also can take a free test of the Multiple Choice Questions of Mechanical Engineering. Each question has four options followed by the right answer. These Mechanical Engineering MCQ Questions are selected supported by the newest exam pattern.
Q1. When a gas is heated, change takes place in
(A) Temperature
(B) Pressure
(C) Volume
(D) All of these
Answer: (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
Answer: (C) 4.187
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
Answer: (C) Remain constant
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
Q10. The gas constant (R) is equal to the __ of two specific heats.
(A) Product
(B) Sum
(C) Difference
(D) Ratio
Answer:(C) Difference
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
Answer: (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
Answer: (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
Answer: (B) Cut-off is constant
Q15. Stirling and Ericsson cycles are
(A) Reversible cycles
(B) Irreversible cycles
(C) Semi-reversible cycles
(D) Adiabatic irreversible cycles
Answer:(A) Reversible cycles
Q16. One molecule of oxygen consists of __ atoms of oxygen.
(A) 2
(B) 4
(C) 8
(D) 16
Answer: (A) 2
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
Answer: (D) Charles’ law
Q20. On weight basis, air contains following parts of oxygen
(A) 21
(B) 23
(C) 25
(D) 73
Answer: (B) 23
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