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Showing posts with label Mechanical Subjects. Show all posts
Showing posts with label Mechanical Subjects. Show all posts

GATE Mechanical Engineering Preparation and free study material

Normally GATE exam consists of those questions which are mostly related to research to be done at Master Level i.e. M.Tech or M. E. level. So, It is very necessary to get ready for preparation of those subjects on which complete M. Tech or M. E. is based. In case of Mechanical Engineering, One should prepare the following most important subjects.

1. Mechanics of Solids or (Engineering Mechanics + Strength of Materials) which is base for any motion and design related research.

2. Thermal engineering which includes Fluid Mechanics which is most important subject for thermal engineering specialization in M. Tech or M. E. Second is thermodynamics, Heat and mass transfer and Refrigeration and Air conditioning. One can find numerous application of fluid mechanics like fountains, fire brigade works, hydro-power station and many more.

Why cooling capacity unit of domestic refrigerator and Air Conditioner (AC) is different?

Have you ever wondered, Why capacity of the domestic refrigerator and Air Conditioner (AC) is different though both are refrigeration system? What is the basic difference between them with respect to the cooling capacity?

The capacity of the domestic refrigerator is normally rated in 'Litre'. Litre is actually a unit of volume and it is applicable to the domestic refrigerator while dealing with space/volume to be cooled. Thus, liter capacity actually indicates the volume or space to be cooled by the domestic refrigerator.

On the other hand, the capacity of Air Conditioner (AC) is given by term 'Ton of refrigeration'.

What is one Ton refrigeration?

All you need to know about Thermodynamics Properties

Thermodynamic Property is a measurable characteristic of the system. To get the status of any process of the system, one should have at least two properties at hand. Thus to define the state of a system, we must know the information about different thermodynamics properties. 

One can classify the properties in following ways.

1. Primitive Properties (which are taken from other branches of the science)
  • Pressure, P
  • Velocity, v
  • Volume, V

2. Basic Thermodynamic Properties (which are defined by the laws of the thermodynamics)
  • Temperature, T (defined by the zeroth law of the Thermodynamics)
  • Internal Energy, U (defined by the first law of the Thermodynamics)
  • Entropy, S (defined by the second law of the Thermodynamics)
3. Derived Thermodynamics Properties (Combination of various other properties defined earlier)
  • Enthalpy ( U + P.V)
  • Gibbs Energy (U + PV-TS)
  • Specific Heat at Constant Pressure, Cp
  • Specific Heat at Constant Volume, Cv

Difference between 'Thermodynamics' and 'Heat Transfer'

Thermodynamics and Heat Transfer both are part of thermal engineering and each has its own meaning and importance. Both deals with heat and energy then, one might ask, what is the real difference between the two subjects ? i.e. Thermodynamics and Heat Transfer

"Thermodynamics" deals with the amount of energy in form of heat or work during a process and only considers the end states in equilibrium. It will not give information about how long it will take to reach to the final state in equilibrium. While,

"Heat Transfer" deals with the rate of energy transfer thus, it gives idea of how long a heat transfer will occur? Heat transfer deals with time and non equilibrium phenomena. Heat can only transfer when there is a temperature gradient exists in a body and which is indication of non equilibrium phenomena.

In short, Thermodynamics gives "Why"  a process will occur and Heat Transfer will tell, "How" a process will occur when there is a concern about transfer of heat.

To support all these arguments, Thermodynamics uses following laws,

  • Zeroth Law of Thermodynamics
  • First law of Thermodynamics
  • Second Law of Thermodynamics
  • Third Law of Thermodynamics

While, Heat Transfer uses,

  • Fourier's Law (Heat conduction)
  • Newtons Law of Cooling (Heat convection)
  • Planck's Law (Thermal Radiation)
  • Stephan Boltzman's Law (Thermal Radiation)
  • Wein's Law (Thermal Radiation)
  • Kirchoff's Law (Thermal Radiation)
  • Lambart's Law (Thermal Radiation)
Learn more about such important questions to be asked in Mechanical Engineering Interview

Why compression ratio of petrol engine is kept low compared to diesel engine?

What is the need of high compression ratio? 

Today every machine is expected to give higher efficiency. When we talk about petrol engine and diesel engine whose thermal efficiency is directly related to 'compression ratio'. That means if we want to achieve higher thermal performance in terms of efficiency, we should provide high compression ratio for both the engine.

Quiz-2 Objective questions in mechanical engineering: Heat transfer

Get ready for the quiz on 'Heat Transfer' subject and check your knowledge by appearing for the test given below. By the end of the quiz, you will get your score out of 10 as well as answer keys. So, get ready to check your knowledge in basics of thermodynamics.

You need to enter Your Name & Passcode which is mechanicalduniya to enter into the quiz interface.

The quiz is based on following topics of Heat transfer

Quiz-1 Objective questions in mechanical engineering: Basic of thermodynamics-1

This is a multiple choice question quiz. To appear for the test, you need to enter following details at the quiz interface. 1. Your name and passcode i.e. thermotest

By the end of quiz, you will get your score out of 10 as well as answer keys. So, get ready to check your knowledge in basics of thermodynamics.

Most important subjects for GATE Mechanical Engineering

Normally in Mechanical engineering, we learn different subjects covering complete mechanical engineering and its basics.

Undergraduate syllabus or curriculum normally contains subjects like
Machine Design mainly requires knowledge of Strength of Materials because to design of any machine component, we need to look for types of loading, calculation of equivalent forces and stresses. So, before studying Machine Design, we need to have sound knowledge of strength of materials. So, in curriculum of any mechanical engineering, Strength of Materials/Mechanics of Solids are covered (in first or second semester) before Machine Design.

Objective questions in mechanical engineering (Thermal Engineering) for competitive exams

Choose the right answer:

1. One metre (1 m) of water column  is equivalent to 
(A) 0.1 kN per square meter
(B) 1.0 kN per square meter
(C) 10 kN per square meter
(D) 100 kN per square meter

Objective questions in mechanical engineering (Manufacturing) for competitive exams

Choose the correct answer:

1. In a tool steel the percentage of silicon is usually restricted to 
(A) 0.5 % 
(B) 1 %
(C) 0.2 %
(D) 2 %

Syllabus for 'Basic Mechanical Systems (BMS)' First Year - SVNIT, Surat

The following post contains the syllabus of 'Basis Mechanical Systems (BMS)' of First year SVNIT Students

Chapter: 1 

Conventional and non-conventional energy sources-types of fuels, Calorific value of fuels, calculation, 
of minimum air required for Complete Combustion of fuel.

Introduction to 'Basics of Mechanical Systems' Subject, SVNIT-Surat

Sardar Vallabhbhai National Institute of Technology (SVNIT), Surat - A Deemed University has 'Basics of Mechanical Systems (BMS)' as one of the first year subjects. This subject belongs to the Mechanical Engineering.  This subject is quite similar to "Elements of Mechanical Engineering" for Gujarat Technological University first year students. 

The subject involves following major topics

1. Energy Resources 
  • Conventional Energy Sources like gas, oil, coal etc. 
  • Non Conventional energy sources like solar energy, wind energy, tidal energy, geo-thermal energy etc.
  • Fuel and Combustion

Heat and mass transfer - NPTEL Video lectures from Dr. S P Sukhatme

In every mechanical engineering curriculum, heat and mass transfer is an important subject for each student of mechanical engineering. As a mechanical engineer, one should be familiar with following basic subjects:

1. Solid Mechanics (Engineering Mechanics + Strength of Materials)
2. Fluid Mechanics
3. Thermodynamics
4. Heat and mass transfer
5. Machine dynamics and kinematics

One should be very clear in all those subjects to know other subject very well.

In classroom, every faculty/teacher tries hard to explain every details but it depends on faculty to faculty. To get and share knowledge from IIT professor, MHRD started NPTEL (National Program on Technology Enhanced Learning) which records and provides all subject's video lectures from different IIT professors,

Here, I am presenting with you such video lecture series, i.e. 'Heat and mass transfer' by Dr. S P Sukhatme from IIT Bombay.

Heat and Mass Transfer Video Lectures

Importance of Thermal Engineering (A Specialization In Mechanical Engineering )

This article deals with some important views of thermal engineering in Mechanical engineering point of view. As there are many specialization in Mechanical Engineering like
  • Machine Design
  • Thermal Engineering 
  • Manufacturing
These above three specialization makes Mechanical Engineering, an evergreen branch of engineering. 

Machine Design: