Mechanical Engineering Interview Questions and Answers
Question - 41 : - What is the difference between total moisture and the inherent moisture of coal?
Answer - 41 : - The total moisture of the coal means the total moisture of the sample while the air-dried sample is known as the inherent moisture of the coal.
Question - 42 : - Why is a thermostat used in the cooling system of engines?
Answer - 42 : - A thermostat in the cooling system works to keep the engine cool at the optimum level. Doing so prevents a decrease in the efficiency of the system.
Question - 43 : - Explain a process flow diagram.
Answer - 43 : - A process flow diagram is a sketch to describe the primary flow course. It has symbols to identify vessels and other instruments. The illustration shows major equipment, plant streams, key central loops, and a general relationship between components used to complete a task.
Question - 44 : - Name the different types of compressors used in a gas turbine.
Answer - 44 : - This may seem a general question but it is very important to consider while preparing for mechanical engineering interview questions and answers. You can answer this question by saying three types of compressors are used in a gas turbine- Axial compressor, Centrifugal compressor, and Mixed Flow compressor.
Question - 45 : - What are the major and minor head losses in a fluid flow system?
Answer - 45 : - In the fluid flow system, the losses that occur in the pipes are termed as major losses whereas head losses that occur due to bends and additional parts in the straight pipe system are termed minor losses.
Question - 46 : - How can you differentiate between cast iron, mild steel, and high carbon steel?
Answer - 46 : - These three metals can be differentiated by the kind of spark they produce. Cast iron produces very thick and short flashes. Mild steel produces medium-sized dense sparks while high carbon steel gives thick long sparks. Learn more about these terms through mechanical engineering courses.
Question - 47 : - Give one drawback of supercritical boilers?
Answer - 47 : - Supercritical boilers lack a heavy drum for the separation of steam from the mixture of water and steam.
Question - 48 : - What is the basic difference between a pipe and a tube?
Answer - 48 : - A pipe is measured based on its internal diameter whereas a tube is measured based on its external diameter. You must learn the basics of mechanical engineering for interview.
Question - 49 : - Why is the pneumatic system preferred over the hydraulic system?
Answer - 49 : - It is so because pneumatic systems are quite cheaper than hydraulic systems. Additionally, pneumatics move faster and do not leak oil in case of any leakage.
Question - 50 : - What is mechanical refrigeration?
Answer - 50 : - It is a process in which heat is removed from a particular location using an artificial heat-exchange system. Depending upon its application, the refrigeration can be magnetic, cyclic, non-cyclic, or thermoelectric.