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Test: Basic Concept - 1 - Mechanical Engineering MCQ


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15 Questions MCQ Test Thermodynamics - Test: Basic Concept - 1

Test: Basic Concept - 1 for Mechanical Engineering 2025 is part of Thermodynamics preparation. The Test: Basic Concept - 1 questions and answers have been prepared according to the Mechanical Engineering exam syllabus.The Test: Basic Concept - 1 MCQs are made for Mechanical Engineering 2025 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Basic Concept - 1 below.
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Test: Basic Concept - 1 - Question 1

 The sequence of processes that eventually returns the working substance to its original state is known as

Detailed Solution for Test: Basic Concept - 1 - Question 1

Thermodynamic cycle can be defined as a series of state changes such that the final and initial state is identical.

Test: Basic Concept - 1 - Question 2

According to thermodynamics, the universe is defined as_______.

Detailed Solution for Test: Basic Concept - 1 - Question 2

In thermodynamics, a system is any part of the universe which is under observation  and the rest of the universe, except the system, are called its surroundings.

So, universe = system + surroundings.

Test: Basic Concept - 1 - Question 3

Which one ofthe following is extensive property of a thermodynamics system

Detailed Solution for Test: Basic Concept - 1 - Question 3

The properties which are mass independent are intensive properties and those which are mass dependent are extensive properties.
Volume depends upon the amount of matter present in the system. Hence, it is an extensive property.

Test: Basic Concept - 1 - Question 4

Which of the following quantities is not the property of the system

Detailed Solution for Test: Basic Concept - 1 - Question 4

Since heat transfer is the path function hence it is not the property of the system.

Test: Basic Concept - 1 - Question 5

The fundamental unit of enthalpy is

Detailed Solution for Test: Basic Concept - 1 - Question 5

Explanation:

- Enthalpy is defined as the heat content of a system at constant pressure. It is represented by the symbol H.

- The unit of enthalpy is derived from the units of energy, which are Joules (J) in the International System of Units (SI).

- The fundamental unit of energy is Joule, which is represented as ML2T-2.

- Since enthalpy is a form of energy, the fundamental unit of enthalpy is also ML2T-2.

Test: Basic Concept - 1 - Question 6

A closed thermodynamic system is one in which

Detailed Solution for Test: Basic Concept - 1 - Question 6

Open system: Both mass and energy transfer takes place
Closed system: No mass transfer, energy transfer may takes place
Isolated system: Neither energy nor mass transfer takes place.

Test: Basic Concept - 1 - Question 7

The value of an extensive property is extensively dependent on

Detailed Solution for Test: Basic Concept - 1 - Question 7

The value of an extensive property is influenced by various factors:

  • Mass or size of the system: The larger the mass, the greater the extensive property.

  • Interactions with surroundings: How the system interacts with its environment can affect its extensive properties.

  • Path taken between states: The specific process by which the system changes states can impact its extensive properties.

  • Nature of boundaries: The type of boundaries, whether rigid or flexible, plays a role in determining extensive properties.

Test: Basic Concept - 1 - Question 8

A diathermic wall is one which

Detailed Solution for Test: Basic Concept - 1 - Question 8

A diathermic wall is a wall that allows the transfer of heat (thermal interaction) through it. The term diathermic comes from Greek, where "dia" means "through" and "therm" means "heat." Therefore, a diathermic wall is one that permits thermal interaction, meaning it allows heat to pass through it.

  • Option A (prevents thermal interaction) refers to an adiabatic wall, which prevents heat transfer.
  • Options C and D (encourages and discourages thermal interaction) are not standard terms in this context.

Thus, the correct answer is B: permits thermal interaction.

Test: Basic Concept - 1 - Question 9

​Which of the following are intensive properties
1. Kinetic energy
2. Specific enthalpy
3. Pressure
4. Entropy
Codes:

Detailed Solution for Test: Basic Concept - 1 - Question 9

Intensive properties are characteristics of a substance that do not depend on the amount of material present. Here are the properties listed and their classifications:

  • Kinetic energy: This is an extensive property because it depends on the mass of the substance.
  • Specific enthalpy: This is an intensive property as it measures energy per unit mass, making it independent of the total mass.
  • Pressure: This is also an intensive property because it is defined as force per unit area, regardless of the quantity of substance present.
  • Entropy: This is another intensive property as it is a measure of disorder per unit of energy, independent of the total system size.

In summary, the intensive properties from the list are:

  • Specific enthalpy
  • Pressure
  • Entropy
Test: Basic Concept - 1 - Question 10

For a system to be in thermodynamic equilibrium the system and its surroundings are to be in

Detailed Solution for Test: Basic Concept - 1 - Question 10

A system said to be in thermodynamic equilibrium with surrounding if:

It is in thermal, chemical as well as mechanical equilibrium with the surrounding.

And when system is in thermodynamic equilibrium there won't be any spontaneous change.

Test: Basic Concept - 1 - Question 11

A small steam whistle (perfectly insulated and doing no shaft work) causes a drop of 0.8 kJ/kg in enthalpy of steam from entry to exit. The kinetic energy of the steam at entry is negligible, the velocity of steam at exit is

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Test: Basic Concept - 1 - Question 12

What is the speed of sound in Neon gas at a temperature of 500 K (gas constant of neon is 0.4210 kJ/kg-k)?

Detailed Solution for Test: Basic Concept - 1 - Question 12

Correct option is d) 592 m/s

Test: Basic Concept - 1 - Question 13

Which of the following relationship is valid only for reversible process undergone by a closed system of simple compressible substance (neglect changes in kinetic and potential energy)?

Detailed Solution for Test: Basic Concept - 1 - Question 13

For reversible process, by first law

Test: Basic Concept - 1 - Question 14

In a steady state flow process taking place in a device with a single inlet and a single outlet, the work done per unit mass flow rate is given by  where v is the specific volume and p is the pressure. The expression for w given above

Detailed Solution for Test: Basic Concept - 1 - Question 14

For steady flow reversible process,

Test: Basic Concept - 1 - Question 15

A balloon containing an ideal gas is initially kept in an evacuated and insulated room. The balloon ruptures and the gas fills up the entire room. Which one of the following statement is true at the end of the above process?

Detailed Solution for Test: Basic Concept - 1 - Question 15

Since the kinetic energy of the molecules won’t change in vacuum, ⇒ temperature remains constant.

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