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7th December 2016, 03:42 PM
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| Re: ONGC Exam Mechanical Engineering
The ONGC is invited engineering candidates for to get in various posts in ONGC. All candidates are invited for to attend entrance exam. Syllabus for Mechanical Engineering for ONGC Exam consisting topics as: Topics covered: General Awareness Concerned subject Aptitude test Comprehension Reasoning (Verbal/Non-verbal) Numerical Ability/Quantitative Aptitude Data Interpretation Paper pattern: There will be 80 questions on Concerned Subjects with 80 marks. Each question on Concerned Subjects carries 1 single mark. There will be 40 questions on General Awareness with 40 marks. Each question on General Awareness carries 1 single mark. And there will be 30 questions on Aptitude with 30 marks. Each single question on General Awareness carries 1 mark. The weight-age for final selection in this exam will be 60 marks of written test . There is an interview of 15 marks. ONGC Placement Paper Mechanical engineering    ONGC Placement Paper Mechanical engineering: 1 What is the difference between isotropic and anisotropic materials? Ans If a material exhibits same mechanical properties regardless of loading direction, it is isotropic eg., homogeneous cast materials. Materials lacking this property are anisotropic 2 what are orthotropic materials It is a special class of anisotropic materials which can be described by giving their properties in three perpendicular direction et wood composites 3 A plain carbon steel has BHN of 180 What are values of Rc, VHN and ultimate strength? Ans Rc-RHN/10 18,VHN BHN 180 4 What properties need to be considered for applications calling for following requirement: irigdity strength for no plastic deformation under static load wear resistance reliability and safety Ans Rigidity- elastic modules and yield strength Strength for no plastic deformation under static loading-yield point Wear resistance-Hardness Reliability and safety-Endurance limit and yield point 5 Explain the effects of alloying chromium and nickel in stainless steel. Addition of nickel and chromium increases the tensile strength and increase in resistance to corrosion takes place. 6 Mention two types of dislocation, Dislocation refers to a break in the continuity of the lattice. In edge dislocation, one place of atoms gets squeezed out.In screw dislocation the lattice atoms move from their regular ideal positions. 7 What are the principal constituents of brass? Principal constituents of brass are copper and zinc 8 what is curie point? Curie point is te temperature at which ferromagnetic materials can no longer be magnetized by outside forces 9 Specific strength of materials is very high when they are in fiber size but lower when they are in bar form-Why? Crystal structure has ordered, repeating arrangement of atoms, fibers are liable to maintain this and thus have high specific strength. As size increases, the condition of ordered and repeating arrangements cant be guaranteed because of several types of defects and dislocations and thus the specific strength gets lower 10 what is the percentage of carbon in cast iron? 2.5% 11 Which element is added in steel to increase resistance to corrosion? Chromium 12 whether individual component material retain their characteristics or not Yes 13 An elastomer is a polymer when its percentage elongation rate is Greater than 100% |
