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Test: Second Law of Thermodynamics - 2 - Mechanical Engineering MCQ


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10 Questions MCQ Test - Test: Second Law of Thermodynamics - 2

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Test: Second Law of Thermodynamics - 2 - Question 1

Which aspect is not true in the context of the efficiency of a Carnot cycle engine?The efficiency of a Carnot cycle engine

Test: Second Law of Thermodynamics - 2 - Question 2

Consider the following statements:
1. It is the second law of thermodynamics which provides criterion as to the probability of various processes.
2. Heat and work are completely interchangeable forms of energy.
3. Work is high grade energy.
4. The complete conversion of low grade energy into high grade energy in a cycle is impossible.

Which of the above statements are correct

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Test: Second Law of Thermodynamics - 2 - Question 3

The four processes of the Carnot cycle are

Detailed Solution for Test: Second Law of Thermodynamics - 2 - Question 3


Hence Carnot cycle consists of two reversible isothermal and two isentropic process.

Test: Second Law of Thermodynamics - 2 - Question 4

Perpetual motion machine of second kind violates the

Detailed Solution for Test: Second Law of Thermodynamics - 2 - Question 4

Perpetual motion machine of the second kind (PMM2): A fictitious machine which produces net work in a complete cycle by exchanging heat with only one reservoir is called the PMM2.

It violates the Kelvin plank statement.


The heat engine will produce net work in a complete cycle by exchanging heat with only single reservoir thus violating the Kelvin-Piank statement.

Test: Second Law of Thermodynamics - 2 - Question 5

The efficiency of a thermodynamic cycle cannot be infinite since it

Test: Second Law of Thermodynamics - 2 - Question 6

 Second law of thermodynamics defines

Test: Second Law of Thermodynamics - 2 - Question 7

Kelvin-plank law deals with

Detailed Solution for Test: Second Law of Thermodynamics - 2 - Question 7

Kelvin-Plank gives the concept of heat engine hence, it is conversion of heat into work.

Test: Second Law of Thermodynamics - 2 - Question 8

The efficiency of the Carnot cycle may be increased by

Test: Second Law of Thermodynamics - 2 - Question 9

In a Carnot engine, when working substance gives heat to the sink

Detailed Solution for Test: Second Law of Thermodynamics - 2 - Question 9

In Carnot engine, source and sink is thermal energy reservoir hence as heat is rejected or extracted, temperature does not change.

Test: Second Law of Thermodynamics - 2 - Question 10

Which of the following represents Carnot cycle

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