Mechanical Engineering Thermodynamics – Set 08

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Q1. For a thermodynamic process to be reversible, the temperature difference between hot body and working substance should be

(A) Zero
(B) Minimum
(C) Maximum
(D) Infinity

Answer: (A) Zero

Q2. In an isothermal process, the internal energy

(A) Increases
(B) Decreases
(C) Remain constant
(D) First increases and then decreases

Answer: (C) Remain constant

Q3. In a Carnot cycle, heat is transferred at

(A) Constant pressure
(B) Constant volume
(C) Constant temperature
(D) Constant enthalpy

Answer: (C) Constant temperature

Q4. The value of gas constant (R) in S. I. units is

(A) 0.287 J/kgK
(B) 2.87 J/kgK
(C) 28.7 J/kgK
(D) 287 J/kgK

Answer: (D) 287 J/kgK

Q5. The state of a substance whose evaporation from its liquid state is complete, is known as

(A) Perfect gas
(B) Vapour
(C) Steam
(D) Air

Answer: (A) Perfect gas

Q6. A heat exchange process in which the product of pressure and volume remains constant is known as

(A) Heat exchange process
(B) Throttling process
(C) Isentropic process
(D) Hyperbolic process

Answer: (D) Hyperbolic process

Q7. Carnot cycle efficiency depends upon

(A) Properties of the medium/substance used
(B) Condition of engine
(C) Working condition
(D) Temperature range of operation

Answer: (D) Temperature range of operation

Q8. Which of the following statement is incorrect?

(A) The liquid fuels have higher calorific value than solid fuels
(B) The solid fuels have higher calorific value than liquid fuels
(C) A good fuel should have low ignition point
(D) The liquid fuels consist of hydrocarbons

Answer: (B) The solid fuels have higher calorific value than liquid fuels

Q9. Which of the following cycles has maximum efficiency?

(A) Rankine
(B) Stirling
(C) Carnot
(D) Brayton

Answer: (C) Carnot

Q10. The unit of time in S.I. units is

(A) Second
(B) Minute
(C) Hour
(D) Day

Answer: (A) Second

Q11. Those substances which have so far not been resolved by any means into other substances of simpler form are called

(A) Atoms
(B) Compounds
(C) Elements
(D) Molecules

Answer: (C) Elements

Q12. The volumetric or molar specific heat at constant pressure is the product of

(A) Molecular mass of the gas and the specific heat at constant volume
(B) Atomic mass of the gas and the gas constant
(C) Molecular mass of the gas and the gas constant
(D) None of the above

Answer: (D) None of the above

Q13. If a gas is heated against a pressure, keeping the volume constant, then work done will be equal to

(A) +ve
(B) -ve
(C) Zero
(D) Anywhere between zero and infinity

Answer: (C) Zero

Q14. Which of the following is the lightest and most volatile liquid fuel?

(A) Gasoline
(B) Kerosene
(C) Fuel oil
(D) None of these

Answer: (A) Gasoline

Q15. In a no flow reversible process for which p = (3V + 15) × 105 N/m², V changes from 1 m3 to 2 m3. The work done will be about

(A) 100 × 10⁵ joules
(B) 1 × 10⁵ joules
(C) 10 × 10⁵ joules
(D) 10 × 10⁵ kilo joules

Answer:(C) 10 × 10⁵ joules

Q16. Carbonization of coal consists of

(A) Drying and crushing the coal to a fine powder
(B) Moulding the finely ground coal under pressure with or without a binding material
(C) Heating the wood with a limited supply of air to temperature not less than 280°C
(D) None of the above

Answer: (D) None of the above

Q17. Change in internal energy in a closed system is equal to heat transferred if the reversible process takes place at constant

(A) Pressure
(B) Temperature
(C) Volume
(D) Internal energy

Answer: (C) Volume

Q18. A diathermic wall is one which

(A) Prevents thermal interaction
(B) Permits thermal interaction
(C) Encourages thermal interaction
(D) Discourages thermal interaction

Answer: (B) Permits thermal interaction

Q19. One barometric pressure or 1 atmospheric pressure is equal to

(A) 1 kgf/cm²
(B) 1.033 kgf/cm²
(C) 0 kgf/cm²
(D) 1.0197 kgf/cm²

Answer: (B) 1.033 kgf/cm²

Q20. Which law states that the internal energy of a gas is a function of temperature?

(A) Charles’ law
(B) Joule’s law
(C) Boyle’s law
(D) There is no such law

Answer: (B) Joule’s law

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