Engineering Thermodynamics MCQ Questions & Answers

51

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

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Answer & Solution

Answer: Option D

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52

The value of 1 mm of Hg is equal to

A) 1.333 N/m² B) 13.33 N/m² C) 133.3 N/m² D) 1333 N/m²

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Answer: Option C

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53

The efficiency of Joule cycle is

A) Less than Carnot cycle B) Equal to Carnot cycle C) Greater than Carnot cycle D) None of these

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Answer: Option A

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54

A mixture of gas expands from 0.03 m³ to 0.06 m³ at a constant pressure of 1 MPa and absorbs 84 kJ of heat during the process. The change in internal energy of the mixture is

A) 30 kJ B) 84 kJ C) 54 kJ D) 114 kJ

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Answer: Option C

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55

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

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Answer: Option C

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56

First law of thermodynamics

A) Enables to determine change in internal energy of the system B) Does not enable to determine change in entropy C) Provides relationship between heat, work and internal energy D) All of the above

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Answer: Option D

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57

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

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Answer: Option D

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58

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

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Answer: Option D

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59

The statement that molecular weights of all gases occupy the same volume is known as

A) Avogadro's hypothesis B) Dalton's law C) Gas law D) Law of thermodynamics

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Answer: Option A

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60

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

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Answer: Option C

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Engineering Thermodynamics MCQ Questions & Answers | Mechanical Engineering