Are you guys looking for Mechanical Engineering MCQ Questions with Answers PDF Free Download as per Mechanical Engineeringnew 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. High air-fuel ratio in gas turbines
(A) Increases power output
(B) Improves thermal efficiency
(C) Reduces exhaust temperature
(D) Do not damage turbine blades
Answer: (C) Reduces exhaust temperature
Q2. Which of the following gas has the highest calorific value?
(A) Coal gas
(B) Producer gas
(C) Mond gas
(D) Blast furnace gas
Answer:(A) Coal gas
Q3. The __ is obtained when carbonization of coal is carried out at 500° to 700° C.
(A) Soft coal
(B) Hard coal
(C) Pulverized coal
(D) Bituminous coal
Answer: (A) Soft coal
Q4. The gas turbine cycle with regenerator improves
(A) Thermal efficiency
(B) Work ratio
(C) Avoids pollution
(D) None of these
Answer: (A) Thermal efficiency
Q5. The isothermal and adiabatic processes are regarded as
(A) Reversible process
(B) Irreversible process
(C) Reversible or irreversible process
(D) None of these
Answer: (A) Reversible process
Q6. A path 1-2-3 is given. A system absorbs 100 kJ as heat and does 60 kJ of work while along the path 1-4-3, it does 20 kJ of work. The heat absorbed during the cycle 1-4-3 is
(A) -140 kJ
(B) -80 kJ
(C) -40 kJ
(D) +60 kJ
Answer: (D) +60 kJ

Q7. The amount of heat required to raise the temperature of __ water through one degree is called kilojoules.
(A) 1 g
(B) 10 g
(C) 100 g
(D) 1000 g
Answer: (D) 1000 g
Q8. One kg of hydrogen requires 8 kg of oxygen and produces
(A) 1 kg of water
(B) 7 kg of water
(C) 8 kg of water
(D) 9 kg of water
Answer: (D) 9 kg of water
Q9. The absolute zero pressure can be attained at a temperature of
(A) 0°C
(B) 273°C
(C) 273 K
(D) None of these
Answer: (D) None of these
Q10. The efficiency of the Carnot cycle may be increased by
(A) Increasing the highest temperature
(B) Decreasing the highest temperature
(C) Increasing the lowest temperature
(D) Keeping the lowest temperature constant
Answer: (A) Increasing the highest temperature
Q11. The distillation carried out in such a way that the liquid with the lowest boiling point is first evaporated and re-condensed, then the liquid with the next higher boiling point is then evaporated and re-condensed, and so on until all the available liquid fuels are separately recovered in the sequence of their boiling points. Such a process is called
(A) Cracking
(B) Carbonization
(C) Fractional distillation
(D) Full distillation
Answer: (C) Fractional distillation
Q12. Otto cycle efficiency is higher than Diesel cycle efficiency for the same compression ratio and heat input because in Otto cycle
(A) Combustion is at constant volume
(B) Expansion and compression are isentropic
(C) Maximum temperature is higher
(D) Heat rejection is lower
Answer:(D) Heat rejection is lower
Q13. In an ideal gas turbine plant, it is assumed that the compression and expansion processes are
(A) Isothermal
(B) Isentropic
(C) Polytropic
(D) None of these
Answer: (B) Isentropic
Q14. The root mean square velocity of the gas molecules is given by (where k = Boltzmann’s constant, T = Absolute temperature, and m = Mass of one molecule of a gas)
(A) √(KT/m)
(B) √(2KT/m)
(C) √(3KT/m)
(D) √(5KT/m)
Answer: (C) √(3KT/m)
Q15. An open cycle gas turbine works on
(A) Carnot cycle
(B) Otto cycle
(C) Joule’s cycle
(D) Stirling cycle
Answer: (C) Joule’s cycle
Q16. The ratio of root mean square velocity to average velocity of gas molecules at a particular temperature is
(A) 0.086
(B) 1.086
(C) 1.086
(D) 4.086
Answer: (B) 1.086
Q17. One reversible heat engine operates between 1600 K and T2 K and another reversible heat engine operates between T2 K and 400 K. If both the engines have the same heat input and output, then temperature T2 is equal to
(A) 800 K
(B) 1000 K
(C) 1200 K
(D) 1400 K
Answer: (A) 800 K
Q18. A molecule consisting of one atom is known as
(A) Mono-atomic
(B) Di-atomic
(C) Tri-atomic
(D) Poly-atomic
Answer: (A) Mono-atomic
Q19. Which of the following process can be made reversible with the help of a regenerator?
(A) Constant pressure process
(B) Constant volume process
(C) Constant pvn process
(D) All of these
Answer:(D) All of these
Q20. For the constant pressure and heat input, the air standard efficiency of gas power cycle is in the order
(A) Dual cycle, Diesel cycle, Otto cycle
(B) Otto cycle, Diesel cycle, Dual cycle
(C) Dual cycle, Otto cycle, Diesel cycle
(D) Diesel cycle, Otto cycle, Dual cycle
Answer: (A) Dual cycle, Diesel cycle, Otto cycle
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