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Mechanical Engineering Exam  >  Mechanical Engineering Test  >  GATE Mechanical (ME) Mock Test Series 2027  >  Thermodynamics - 1 - Mechanical Engineering MCQ

GATE Mechanical (ME) Thermodynamics - 1 Free Online Test 2026


MCQ Practice Test & Solutions: Thermodynamics - 1 (15 Questions)

You can prepare effectively for Mechanical Engineering GATE Mechanical (ME) Mock Test Series 2027 with this dedicated MCQ Practice Test (available with solutions) on the important topic of "Thermodynamics - 1". These 15 questions have been designed by the experts with the latest curriculum of Mechanical Engineering 2026, to help you master the concept.

Test Highlights:

  • - Format: Multiple Choice Questions (MCQ)
  • - Duration: 45 minutes
  • - Number of Questions: 15

Sign up on EduRev for free to attempt this test and track your preparation progress.

Thermodynamics - 1 - Question 1
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Consider the following properties:

  1. Temperature
  2. Viscosity
  3. Specific entropy
  4. Thermal conductivity

Which of the above properties of a system is/are intensive?

Detailed Solution: Question 1

(d) Intensive properties are independent of the mass in the system, for example, density, pressure, temperature. Extensive properties are related to mass, for example, volume, energy.

Thermodynamics - 1 - Question 2
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Pressure reaches a value of absolute zero

Detailed Solution: Question 2

(d) Temperature and pressure are the measures of molecular moment of the system. The molecular moment of the system is zero, the absolute temperature and absolute pressure becomes zero.

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Thermodynamics - 1 - Question 3
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Ice kept in a well insulated thermos flask is an example of which system?

Detailed Solution: Question 3

(b) Heat and work cannot be transferred into the ice kept in a well insulated thermos flask, hence, it is an isolated system.

Thermodynamics - 1 - Question 4
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A thermodynamic system is considered to be an isolated one if

Detailed Solution: Question 4

(c) An isolated system has no interaction with its surroundings.

Thermodynamics - 1 - Question 5
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The phenomenon of magnetic arc blow is observed almost exclusively with

Detailed Solution: Question 5

Magnetic arc blow is a phenomenon that primarily occurs during certain types of welding. It can lead to difficulties in maintaining a stable arc while welding. Here are the key aspects to understand:

  • Definition: Magnetic arc blow refers to the deflection of the welding arc caused by magnetic fields.
  • Causes: It is mainly influenced by the magnetic fields generated by the current flowing through the workpiece and the welding equipment.
  • Common Welding Types:
    • D.C. arc welding: This method is most affected by magnetic arc blow due to the direct current used.
    • Gas welding, spot welding, and thermit welding are less susceptible to this issue.
  • Effects: The presence of magnetic arc blow can lead to:
    • Inconsistent weld quality
    • Difficulty in controlling the weld pool
    • Increased risk of defects in the weld
  • Mitigation: To reduce the effects of magnetic arc blow, consider:
    • Adjusting the welding parameters
    • Using alternating current (A.C.) instead of direct current
    • Repositioning the workpiece or the welding torch

Thermodynamics - 1 - Question 6
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Work transfer between the system and surround­ings

Detailed Solution: Question 6

(d) The change in a property of a system is independent of the path the system follows during the change of state. Therefore, properties are point functions. Work transfer is not a property of the system.

Thermodynamics - 1 - Question 7
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A hot metal piece kept in air cools from 80°C to 70°C in t1 seconds, from 70°C to 60°C in t2 seconds and from 60°C to 50°C in t3 seconds, then

Thermodynamics - 1 - Question 8
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A cyclic heat engine does 50 kJ of work per cycle. If the efficiency of the heat engine is 75%, the heat rejected per cycle is

Detailed Solution: Question 8

Given that

W = 50 KJ

η = 0.75

Heat rejected per cycle is determned as

 

Thermodynamics - 1 - Question 9
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It is proposed to build a refrigeration plant for cold storage to be maintained at — 3°C. The ambient temperature is 27° C. If 5 x 106 kJ/h of energy is tobe continuously removed from the cold storage, the minimum power required to run the refrigerator will be

Detailed Solution: Question 9

Given that

T2 = 270 K

T1 = 27 + 273 

=  300 K

Thermodynamics - 1 - Question 10
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A reversible engine has ideal thermal efficiency of 30%. When it is used as a refrigeration machine with all other conditions unchanged, the coefficient of performance will be

Detailed Solution: Question 10

Given that ηe = 0.3 . The COP of the refrigerater is

Thermodynamics - 1 - Question 11
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A heat engine is supplied with 250 kJ/s of heat at a constant fixed temperature of 227° C. The heat is rejected at 27° C. The cycle is reversible, if the amount of heat rejected is

Detailed Solution: Question 11

The  minimum heat rejected by reversible cycle is given by

Thermodynamics - 1 - Question 12
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Which one of the following pairs best expresses a relationship similar to that expressed in the pair “pressure-volume” for a thermodynamic system undergoing a process?

Detailed Solution: Question 12

In a thermodynamic system, pressure and volume are closely related as they influence each other during processes. Similarly, other pairs of thermodynamic properties can reflect this relationship.

  • Enthalpy-entropy: Enthalpy measures total heat content, while entropy indicates disorder. These properties relate to energy transfer but do not correspond as directly as pressure and volume.
  • Pressure-enthalpy: This pair relates pressure and the heat content of a system, but their interaction is more complex and not as fundamental as pressure and volume.
  • Pressure-temperature: This relationship is direct in many systems, especially gases. However, it does not completely capture the essence of a process like pressure-volume does.
  • Temperature-entropy: This pair captures how heat affects a system's disorder. It is fundamental in thermodynamics and closely parallels pressure and volume.

Among these pairs, temperature-entropy is the most analogous to pressure-volume. Both sets of properties are essential in describing the behaviour of a thermodynamic system during processes.

Thermodynamics - 1 - Question 13
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A heat pump working on a reversed Carnot cycle has a COP of 5. If it works as a refrigerator taking 1 kW of work input, the refrigeration effect will be

Detailed Solution: Question 13

COP of the heat Pump is

 

The COP of the refrigerater is 

Thermodynamics - 1 - Question 14
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One reversible heat engine operates between 1600 K and T2 K, and smother reversible engine operates between T2 K and 400 K. If both engines have the same heat input and output, then the temperature T2 must be equal to

Detailed Solution: Question 14

The given condition means equal efficiency of both engines , therefore

Thermodynamics - 1 - Question 15
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A heat engine using lake water at 12° C as source and the surrounding atmosphere at 2°C as sink executes 1080 cycles per minute. If the amount of heat drawn per cycle is 57 J, then the output of the engine will be

Detailed Solution: Question 15

Given That

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About this Mechanical Engineering Practice Test

This test contains 15 MCQs on Thermodynamics - 1 with detailed solutions for each question. It is part of the GATE Mechanical (ME) Mock Test Series 2027 course on EduRev, designed to align with the current Mechanical Engineering syllabus. Each solution explains not just the correct answer but also gives you an understanding of the topic — not just to attempt the question but also help you prepare for the exam with practice.

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