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 cut-off ratio is __; the efficiency of Diesel cycle approaches to Otto cycle efficiency
(A) 1/4
(B) Zero
(C) 1/5
(D) 2
Answer: (B) Zero
Q2. If a gas vapour is allowed to expand through a very minute aperture, then such a process is known as
(A) Free expansion
(B) Hyperbolic expansion
(C) Adiabatic expansion
(D) Throttling
Answer: (D) Throttling
Q3. According to first law of thermodynamics
(A) Work done by a system is equal to heat transferred by the system
(B) Total internal energy of a system during a process remains constant
(C) Internal energy, enthalpy and entropy during a process remain constant
(D) Total energy of a system remains constant
Answer:(D) Total energy of a system remains constant
Q4. If heat be exchanged in a reversible manner, which of the following property of the working substance will change accordingly
(A) Temperature
(B) Enthalpy
(C) Internal energy
(D) Entropy
Answer: (D) Entropy
Q5. A sudden fall in the barometer reading is a sign of approaching
(A) Fine weather
(B) Rains
(C) Storm
(D) Cold wave
Answer: (C) Storm
Q6. An ideal gas as compared to a real gas at very high pressure occupies
(A) More volume
(B) Less volume
(C) Same volume
(D) Unpredictable behavior
Answer: (A) More volume
Q7. The sum of internal energy (U) and the product of pressure and volume (p.v) is known as
(A) Work done
(B) Entropy
(C) Power
(D) Enthalpy
Answer: (D) Enthalpy
Q8. Which of the following has the minimum atomic mass?
(A) Sulphur
(B) Nitrogen
(C) Oxygen
(D) Carbon
Answer: (D) Carbon
Q9. According to Clausius’ statement of second law of thermodynamics
(A) Heat can’t be transferred from low temperature source to high temperature source
(B) Heat can be transferred for low temperature to high temperature source by using refrigeration cycle
(C) Heat can be transferred from low temperature to high temperature source if COP of process is more than unity
(D) Heat can’t be transferred from low temperature to high temperature source without the aid of external energy
Answer: (D) Heat can’t be transferred from low temperature to high temperature source without the aid of external energy
Q10. A cycle consisting of two adiabatic and two constant pressure processes is known as
(A) Otto cycle
(B) Ericsson cycle
(C) Joule cycle
(D) Stirling cycle
Answer: (C) Joule cycle
Q11. Which of the following variables controls the physical properties of a perfect gas?
(A) Pressure
(B) Temperature
(C) Volume
(D) All of the above
Answer: (D) All of the above
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
Answer: (C) Zeroth law of thermodynamics
Q13. No liquid can exist as liquid at
(A) 273°K
(B) Vacuum
(C) Zero pressure
(D) Centre of earth
Answer: (C) Zero pressure
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
Answer: (B) Two values of specific heat
Q15. Which of the following is not the intensive property?
(A) Pressure
(B) Temperature
(C) Density
(D) Heat
Answer: (D) Heat
Q16. Zeroth law of thermodynamics
(A) Deals with conversion of mass and energy
(B) Deals with reversibility and irreversibility of process
(C) States that if two systems are both in equilibrium with a third system, they are in thermal equilibrium with each other
(D) Deals with heat engines
Answer: (C) States that if two systems are both in equilibrium with a third system, they are in thermal equilibrium with each other
Q17. The specific heat of air increases with increase in
(A) Temperature
(B) Pressure
(C) Both pressure and temperature
(D) Variation of its constituents
Answer: (A) Temperature
Q18. For the same compression ratio, the efficiency of dual combustion cycle is
(A) Greater than Diesel cycle and less than Otto cycle
(B) Greater than Diesel cycle
(C) Less than Diesel cycle
(D) Less than Diesel cycle and greater than Otto cycle
Answer: (A) Greater than Diesel cycle and less than Otto cycle
Q19. The area under the temperature-entropy curve (T – s curve) of any thermodynamic process represents
(A) Heat absorbed
(B) Heat rejected
(C) Either heat absorbed or heat rejected
(D) None of these
Answer:(C) Either heat absorbed or heat rejected
Q20. The unit of universal gas constant is
(A) watts/°K
(B) dynes/°C
(C) erg/°K
(D) None of the above
Answer: (C) erg/°K
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- Mechanical Engineering Thermodynamics – Set 1
- Mechanical Engineering Thermodynamics – Set 2
- Mechanical Engineering Thermodynamics – Set 3
- Mechanical Engineering Thermodynamics – Set 4
- Mechanical Engineering Thermodynamics – Set 5
- Mechanical Engineering Thermodynamics – Set 6
- Mechanical Engineering Thermodynamics – Set 7
- Mechanical Engineering Thermodynamics – Set 8
- Mechanical Engineering Thermodynamics – Set 9
- Mechanical Engineering Thermodynamics – Set 10
- Mechanical Engineering Thermodynamics – Set 11
- Mechanical Engineering Thermodynamics – Set 12
- Mechanical Engineering Thermodynamics – Set 13
- Mechanical Engineering Thermodynamics – Set 14
- Mechanical Engineering Thermodynamics – Set 15
- Mechanical Engineering Thermodynamics – Set 16
- Mechanical Engineering Thermodynamics – Set 17
- Mechanical Engineering Thermodynamics – Set 18
- Mechanical Engineering Thermodynamics – Set 19
- Mechanical Engineering Thermodynamics – Set 20
- Mechanical Engineering Thermodynamics – Set 21
- Mechanical Engineering Thermodynamics – Set 22