Skip to main content

Posts

Theory of machine| part -1

Kinematics links - Every part of machine which have relative motion to another part.   → The link should be resistance body.   What is resistant body? →Under the action of force it can transfer motion and power. Kinematics links →1. Rigid links     2. Flexible links     3. Fluid links Rigid links - There is no deformation.   Ex - piston,connecting rod Flexible links - Deformation is allowed under permissible limits. Ex - Belt drive Fluid links - A fluid link is one that is deformed by having fluid in a closed vessel and the motion is transmitted through the fluid by pressure. Ex - Hydraulic press   Types of links - 1. Singular 2. Binary 3. Ternary 4. Quaternary links
Post a Comment
Read more
Recent posts

I.C engine 200 MCQ-ssc-upsc- mechanical engineering

I.C engine 200 MCQ-ssc-upsc- mechanical engineering :- Part - 1 1.Indicated power of four stroke engine is equal to -     A. pLAN                        B. 2pLAN     C. pLAN/2.                    D. 4pLAN ANS - C 2.Compression ratio of I.C. engine is- A. the ratio of volumes of air in cylinder before compression & after compression stroke. B.volume displaced by piston per stroke & clearence volume in cylinder. C.swept volume/cylinder volume D.cylinder volume/swept volume ANS- A 3.Scavenging air of diesel cycle means- A.air used for combustion. B.forced air for cooling cylinder. C.air used for forcing burnt gases out of engine's during the exhaust period. D.air fuel mixture. ANS- C 4.The working cycle un case of four stroke engine is completed in following number of revolutions of crankshaft-     A. 1/2   ...
Post a Comment
Read more

I.C engine - two stroke cycle - four stroke cycle - difference between two stroke four stroke - auto ignition -carburetion - scavenging -supercharging

                              I.C ENGINE Difference of petrol and diesel engine :- 1.Petrol engine run on otto cycle and diesel engine run on diesel cycle. 2.Air fuel mixture suction Stroke in petrol engine.In diesel engine only air sucks in suction stroke. 3.In petrol engine,spark plug is needed.In diesel engine,no spark plug is needed. 4.In petrol engine,compression ratio 6-12. In diesel engine,compression ratio 14-22. 5.In petrol engine,high efficiency. In diesel engine low efficiency. 6.In petrol engine,less vibration & noise. In diesel engine,more vibration & noise. 7.Petrol engine light weight engine. Diesel engine heavy weight engine. 8.Petrol engine generaly use motor cycle,car,light weight vehicles. Diesel engine generaly use truck,bus etc.    GOVERNINNG OF I.C ENGINES : Various methods are : a. Heat and miss governing — used for small engine,No fuel admited during t...
Post a Comment
Read more

Full details of dual cycle

                          I.C ENGINE Dual cycle : It is also called as limited pressure cycle or it also called as mixed cycle. →In this process heat addition process takes place both at constant volume & constant pressure. → This cycle is used for heavy duty diesel engine. The process which takes place in dual cycle are - A. Process (1-2) : Reversible adiabetic(isentropic)compression. B. Process(2-3) : Constant volume heat addition. C. Process(3-4) : Constant pressure heat addition. D. Process(4-5) : Reversible adiabetic(isentropic) expansion. E. Process(5-1) : Constant volume heat rejection. At bellow pV diagram and T-S diagram 1.At point 1, Air enters the cylinder or air is completely filled in the cylinder. 2. Process(1-2) : Compression of air takes place & it is reversible adiabetic compression. 3. During compression process,there is decrease in volume with corresponding in pressure keep...
Post a Comment
Read more

I.C. Engine diesel cycle

                                I.C ENGINE Diesel cycle : It is a theoritical cycle used for compression ingnition or diesel engine. → In this cycle,the heat addition process takes place at constant pressure. → Hence,this cycle is also caled as 'constant pressure process' The following process takes places in diesel cycle - 1. Process (1 - 2) = Reversible adiabetic(isentropic)compression. 2. Process (2 - 3) = constant pressure heat addition. 3. Process (3 - 4) = Reversible adiabetic(isentropic)expansion. 4. Process (4 - 1) = Constant volume heat rejection. PV-diagram of diesel cycle :-           T-S diagram :-                       1. In point 1,only air is taken into the cylinder or engine. 2. Process(1 -2) After air has entered the engine,it is compress isentropically [S 1 - S 2 ]. → During the compr...
Post a Comment
Read more
                             I.C ENGINE HERE WE KNOW ABOUT CARNOT CYCLE, we already discuss in thermodynamics cheptra history behind carnnot cycle and details about this plz check the link : https://engineerapk.blogspot.in/2017/11/history-behind-carnot-cycle-details-of.html?m=1 OTTO CYCLE : Basic of otto cycle ;  * This cycle was introduced by german scientists Dr. A.N. Otto. * It is successfully aplied on petrol engine. * It consist two reversible adiabetic process & two constant volume process. * This is six event cycle -                 A. Suction                 B. Compression                 C. Combustion                 D. Expansion                 E. Blow by(heat rejected)   ...
Post a Comment
Read more
                          I.C ENGINE Engine perform parameter,                                         Parameters are used to measure performance of an engine:            (1) Power  (2) Efficiency (3) Fuel consumption 1.power : (a) Indicated power (IP)                  (b) Brake power (BP)                  (c) Frictional power (FP) 2.Efficiency( η) : (a) Indicated tharmal efficiency (b) Brake tharmal efficiency (c) Mechanical efficiency (d) Relative efficiency (e) Volumetric efficiency 3.Fuel consumption : (a) Indicated specific fuel (b) brake specific fuel             In suction stroke; piston moves T.D.C to B.D.C.  Crank moves (A to B)...
Post a Comment
Read more