Dr. Paresh Gujarati What is the need for a high compression ratio? Today every machine is expected to give higher efficiency. When we talk about the petrol engine and diesel engine whose thermal efficiency is directly related to the ‘compression ratio’. That means if we want to achieve higher thermal performance in terms of efficiency, we should provide … Read more
This is a compilation of a few essential interview questions which were asked at big and reputed companies interviews. What will happen if the diesel engine makes it runs on petrol? (Hyundai) When petrol is added to a diesel engine, a diesel engine will start but will face difficulty in a smooth run as petrol … Read more
In the Mechanical Engineering curriculum, the student needs to understand many mechanisms like piston-slider mechanism, slider-crank, or four-bar chain mechanism. This mechanism can be better understood by the use of animations. There are many options available to create an animation like the use of flash software, PowerPoint presentations. But animation creation in AutoCAD (Auto LISP) … Read more
Choose the correct answer: 1. In tool steel the percentage of silicon is usually restricted to (A) 0.5 % (B) 1 % (C) 0.2 % (D) 2 % 2. In Grey Cast Iron, free graphite is in the form of (A) Crystals (B) Needles (C) Flakes (D) Nodules 3. The depth of hardening is affected … Read more
Any mechanical design project involves a design procedure that you need to stick to it for a complete finalized product you want. Design involves considerations of many things like material and its properties requirements, size, shape, weights well as ergonomics. The design project should aim at the following important criteria to be considered: Optimization with … Read more
Why Specific heat at constant pressure is greater than Specific heat at constant volume? First of all, let us define Specific Heat at Constant Pressure (Cp) and Specific Heat at Constant Volume (Cv): Specific Heat at Constant Pressure (Cp): Specific heat at constant pressure is deImportant interview questions about mechanical engineering – Thermodynamics … Read more
Thermodynamics Tutorial: Second law of Thermodynamics 1 What is the minimum amount of work input necessary to a refrigerator which will convert 1 kg of water at 20 oC into ice at -5oC? (Ans: 40 kJ) 2 A heat engine receives heat from a solar collector plate. Solar radiation of the amount 1880 kJ/m2 falls … Read more
What is energy? Energy or power is nothing but the ability of the physical system to do work. As per the law of energy conservation, the total energy in the universe is constant but it can be transformed from one form to another by the second law of thermodynamics. Energy can be used to do … Read more
