MECHANICAL ENGINEERING

What is friction & Types, coefficient of friction and law's of static , dynamic, solid, fluid friction ? What is friction? The friction force always act in the opposite direction movement of body. it  is a relative motion occurs whenever one item travels relative towards another. Type of friction?       1. Static friction       2. Dynamic friction        a) sliding friction       b) rolling friction      c) Pivot friction 1. Static friction :-  The friction force which is experienced by the body at rest condition is know as static friction. 2. Dynamic friction :- The friction force experienced by a body act motion conduction known as dynamic friction.    Dynamic friction is three types  a) sliding friction :- It is the friction experienced by a body when it slide over another body. b) rolling friction:-  It is the friction experienced  between the surface whi...

  What is pump? Types of pumps and their working?  What is pump?  A pump is defined as the mechanical equipment,  that uses to transfer different fluids & gases from one place to another place,  This can be operated by many energy resources which include manual operation, electricity, engine, wind power and many more, day to day life to industrial applications. Types of pumps   There are mainly  two types of Pump  but they have various categories into it: 1. Dynamic Pump:      Centrifugal Pump: Axial flow                            Submersible pump Mixed flow Peripheral           Special effect pump: Jet pump Electro magnetic pump 2. Positive Displacement Pump:     Reciprocating Pump : Piston pump Plunger pump Diaphragm pump     Rotatory Pump: Screw pump Progressive cavity pump Gear pump Vane pump

  Here are frequently asked mechanical engineering interview questions for freshers as well as experienced engineering candidates. Top 30 interview questions and answers;  1. What are types of gears?   S pur Gear   Bevel Gear   Worm Gear   Gear Rack   Helical Gear   Screw Gear   Internal Gear 2. What do you mean by gear module? The module describes the size of gear, A pair of gears can only mesh correctly if and when the base pitch is the same. 3. What do you mean by gear ratio? The gear ratio is the ratio of the number of teeth in the gear to the number of teeth in the pinion being the smaller of the two gears in mesh.                                              EX -:   Driven\ driving = 75\25 = 3\1 =3:1  4. Why bearing are used? The bearing are used to allow rotation or linear movement and to reduce friction bet...

      MACHINE DESIGN  Introduction of Machine Design         The subject machine design the creation of new and better machine and improving the existing one a new or better machine is one which is more economical in the over all cost of production and operating the prosses of design is long and time consuming one. Classification of Machine Design  There are mainly three classification of machine design which as under: Adoptive Design Development Design New Design   1. Adoptive Design In most cases the designer's work is concerned with adaptation of existing design, this type of design needs no special knowledge and can be attempted by designer by ordinary technical training.   2. Development Design This type of design need considerable scientific training and design ability in order to modify the existing design into a new ideal by adapting a new material or different method of manufacturing.   3. New Design  This t...