In case of gas turbines, the gaseous fuel consumption guarantees are based on (a) high heat value (b) low heat value (c) net calorific value (d) middle heat value (e) calorific value. For the smaller turbines (< 500 kW) the torsional flexibility is not relevant, but for larger turbines the torsional deformations should not be neglected. Decreasing the compression ratio Auto ignition Of the charge after the spark is struck 57. Define endurance limit. 1. Flexibility influence coefficient (fij) is defined as the displacement at joint due to a unit load at joint while all other joints are not load. A. load at breaking point and original cross-sectional area. The actual breaking stress in stress-strain diagram is the ratio of ______. If the resistance is set up against this deformation, the body is known as. Mechanics of Solids MCQ question on Simple Stress and Strain 1. Column sections with large r-values are more resistant to buckling. These two may or may not coincide in general, leading to eccentricity as indicated in Fig. Vibration Model, Equation of Motion-Natural Frequency. 14. 1. MCQ OF STEEL STRUCTURE DESIGN. A QSAR is a mathematical relationship between a biological activity of a molecular system and its geometric and chemical characteristics. Torsional buckling It is usually created in asymmetrical, tall, and metal structures. What is flexibility of electric power transmission? Questions (MCQ) Regulations 2017 (Common to All) UNIT I PROPERTIES OF MATTER TOPIC 1.1 ELASTICITY 1. The element flexibility matrix (f) for a truss member is given by 27.Write the element flexibility matrix (f) for a … of Physics Multiple Choice Questions (MCQ) Regulations 2017 (Common to All) UNIT I PROPERTIES OF MATTER TOPIC 1.1 ELASTICITY 1. Stress is (a)External force (b)Internal resistive force (c)Axial force (d)Radial force (Ans:b) 2. 2. Due to its flexibility in form and superiority in performance, it has replaced, to a large extent, the earlier materials like stone, timber and steel. Steel Structure MCQs Practice Set. - The formula to calculate torsional flexibility is L / (GJ) here, G is the modulus of rigidity, J is the polar moment of inertia and L is the shaft length. Test Set - 1 - Strength of Materials - This test comprises of 40 questions on Strength of Materials. I want to try here the EEE (Electrical and Electronic Engineering) objective questions - - - - - - - - - - - - - Read More Torsional vibration is often a concern in power transmission systems using rotating shafts or couplings where it can cause failures if not controlled. 16.1 INTRODUCTION Many of our modern technologies require materials with unusual combinations of properties that cannot be met by the conventional metal alloys,ceramics,and polymeric materials. The eccentricity could be due to internal material defects, manufacturing errors etc. Sharing is Caring :)-Today we will learn about relation between Young Modulus, Bulk Modulus and Modulus of Rigidity. The ability to accommodate changes in the electric transmission system or operating conditions while maintaining sufficient steady-state and transient margins. 퐺퐽푙 = Torsional flexibility. increase in ply angle and a decrease in (l/h) ratio [3].The symbolic computation technique to analyze the free vibration of generally layered composite beam on the basis of a first-order shear deformation theory. 59. Ans: b. Endurance limit is the maximum value of completely reversed stress that the standard specimen can sustain an infinite number (106) of cycles without failure. 16. Ans: d. 18. Torsional vibrations can lead to seat vibrations or noise at certain speeds. D. yield load and original cross-sectional area. Stiffness influence coefficients: It is defined as when the system is unconstrained the stiffness matrix is positive semi definite hence a constant is used to show the stiffness of system is knows as stiffness influence coefficient denoted as ‘K’. Axial fans are not suitable for long piping operation. 5. 3. 16, the ratio of M cr, cw /M P increases from 0.15 at ρ = 0.5 to 0.744 at ρ = 0.9, due to the large increase of I y which contributes significantly in the elastic lateral torsional buckling capacity of un-symmetrical CWG. PDF unavailable. Compound Shaft - Series connection. Basic International GK. 1496T_c16_577-620 12/31/05 14:08 Page 577 2nd REVISE PAGES. Worlds Honours and Awards. 7. 3. 1. Factor of safety = Maximum stress / Working stress . • Conversely, a lower slenderness ratio results in a higher critical stress (but still within the elastic range of the material). (Part-04). When the ratio of the longer to the shorter side (L/ S) of the slab is at least equal to 2.0, it is called one-way slab, shown in Figure 8.1.a. Torsional vibration is angular vibration of an object—commonly a shaft along its axis of rotation. PDF unavailable. Overview of the Course, Practical and Research Trends. 2.If the width and thickness of a structure is small in comparison to its length, it is known as. Books and Authors. 9.5.2. The influence of the un-symmetry parameter, ρ, is clearly shown in Fig. The model used considering the effect of poisson effect, coupled extensional, bending and torsional deformations as well as rotary inertia [4]. This is especially true for materials that are needed for aerospace, under-water,and transportation … 2. 1.When a body is subjected to a system of loads as a result of this, some deformation takes place. flexibility method (force method) [another method is stiffness method (displacement method)] consider an axial loaded member equation of equilibrium F y = 0 R A - P + R B = 0 one equation for two unknowns [statically indeterminate] ∵both ends A and B are fixed, thus AB = AC + CB = 0. Enjoy the videos and music you love, upload original content, and share it all with friends, family, and the world on YouTube. Relation between Young Modulus, Bulk Modulus, Modulus of Rigidity and Poisson’s Ratio March 4, 2018 Admin 1 Comment elastic constant, strength of material. The bending moment is maximum on a section where shearing force is maximum changes sign is equal is minimum. Pedagogy | Child Development and Pedagogy | Assam High School TET. 15. 6. Download ppts, seminars, class notes for free. 퐸퐴푙 = Axial stiffness. 26.Write the element flexibility matrix (f) for a truss member. Provides torsional stiffness. Quality powerpoint presentations - CivilDigital.com civil forum, engineers forum, civil doubts, civil engineering notes, civil engineering ppts, civil engineering seminars, structural engineering ppts, interview questons, multiple choice, objective, GATE preparation, IES coaching Departmental Interview Questions Practice Tests . Moment of Inertia About polar Axis. Further, architect's scope and imaginations have widened to a great extent due to its mouldability and monolithicity. Website for Civil Engineers and Students. GK International MCQ. Ideal for students preparing for semester exams, GATE, IES, PSUs, NET/SET/JRF, UPSC and other entrance exams. 3 d& / dx represents the rate of change of the angle of twist &, denote = d& / dx as the angle of twist per unit length or the rate of twist, then max = r in general, & and are function of x, in the special case of pure torsion, is constant along the length (every cross section is subjected to the same torque) World Famous Personality. GJ = Torsional rigidity. All of these are elastic constant which are used to design any machinery part or structure. A torsional system with discs of moment of inertia I₁ and I₂ as shown in the below figure, is gear driven such that the ratio of speed of shaft B to shaft A is 'G'. Many Diploma Engineers did not qualify in the Public Service Commission (PSC) Examination lagging of their Subjects Objective Knowlwdge, Specially MCQ and their answers are drawback. 2. torsional loads axial compressive loads axial tension loads. C. maximum load and original cross-sectional area. consider it as a simple torsional spring. The moment diagram for a cantilever carrying linearly varying load from zero at its free end and to maximum at the fixed end will be a rectangle cubic parabola parabola triangle. World Organizations. 2.If the width and thickness of a structure is small in comparison to its length, it is known as. xref 0000004144 00000 n endstream endobj 1391 0 obj >/W[1 1 1]/Type/XRef/Index[43 1321]>>stream One example of a four-way flexible coupling with good torsional flexibility is an elastomeric coupling that operates in shear (as opposed to compression). The torsional stiffness of a member can be defined as(a) Torque for unit moment(b) Torque for unit twist(c) Moment for unit twist(d) Torsion for unit twist53.The stiffness method in structural analysis is known as(a) Unit load method(b) Consistent deformation method(c) Force method(d) Displacement method54. We have discussed about … 2. 1.When a body is subjected to a system of loads as a result of this, some deformation takes place. The stress in a bending beam can be expressed as. The rotor (disk) section has a geometric centre i.e., the centre of the. For hollow circular shaft. World Geography. circular cross-section and the mass centre due to the material distribution. If the compression ratio of an engine working on Otto cycle is increased from 5 to 7, the %age increase in efficiency will be (a) 2% (b) 4% (c) 8% (d) 14% (e) 27%. A second effect of torsional vibrations applies to passenger cars. Neglecting the inertia of gears, the equivalent inertia of disc on shaft B at the speed of shaft A is equal to a) G.I₂ b) G².I₂ c) I₂/G d) I₂/G² QSAR : Activity Relationships Quantitative Structure. Beam Stiffness Example 5 - Load Replacement Apply the boundary conditions: 2 2 32 2 2 12 6 64 12 wL EI L v wL LL L 4 2 3 2 8 6 wL v EI wL EI We can solve for the displacements - Torsional flexibility: It is defined as the angle of twist produced by the unit torque applied. Under the action of loads, it is deflected in the short direction only, in a cylindrical form. GK MCQ : Indian Railways. Home Civil Interview Civil Engineering Interview Questions and … B. load at breaking point and reduced cross-sectional area. Following are the basic types of stress except (a)Tensile stress (b)Compressive stress (c)Shear stress (d)Volumetric stress (Ans:d) 3. Sravanthi -Posted on 25 Nov 15. Basic GK about Indian Railways. In the steady state condition the torsion deformation can result in a difference of a few degrees in the angle of attack near the blade tip, which is well above negligible. In CI engines knocking tendency increases with (1) Increasing the compression ratio ( Increasing inlet temperature of air (3) Decreasing the compression ratio (4) Increasing coolant water temperature The , maximum pressure in the lubrication The results of the finite element analysis also confirmed the results as shown in the same figure. 3. Extreme torsional irregularity, however, is a somewhat newer concept and subset within the larger issue of torsional behavior. PDF unavailable. What is impact load? 4. International Days & Years. Where, θ 1 … It is something that can greatly limit and restrict flexibility in choosing seismic force-resisting systems and configurations. Important MCQs with answers of teaching-learning process and pedagogy. 2.6 Lifting surface flexibility and lift generation-the typical section model ..... 46 A comment on the typical section model used in this text ..... 50 A sidebar – why the ¾ semi-span position? 퐸퐴푙 = Axial flexibility Moment of Inertia About polar Axis. Flexibility: It is defines as the design that can adapt any change when any external change occurs. 퐺퐽푙 = Torsional stiffness. If the resistance is set up against this deformation, the body is known as. PH8151 - Engineering Physics Dept. The ratio between maximum stresses to working stress is known as factor of safety. • A higher slenderness ratio means a lower critical stress that will cause buckling. The property by which a body returns to its original shape after removal of the force is called _____ a) Plasticity b) Elasticity c) Ductility d) Malleability Answer: b Explanation: When an external force acts on a body, the body tends to undergo some deformation. The flexural torsional buckling strength of a single angle loaded in compression through one of its legs may be evaluated using the equivalent slenderness ratio λ e given by- where, K 1, K 2, K 3 = Constants depending upon the end condition, as given in the table below- where, l = centre to centre length of the supporting member The Job of Diploma in Engineers is very tough in Bangladesh. 3 Vibration of Continuous Systems – Assumed Shapes Approach 3.1 Continuous Systems. 2. Thus, it has helped the architects and engineers to build several attractive shell forms and other curved structures. σ = y M / I (1d) where. flexibility influence coefficient unit strain ⇒ The torsional stiffness of a member can be defined as Torque for unit moment Torque for unit twist Moment for unit twist Torsion for unit twist ⇒ In the displacement method of structural analysis, the basic unknowns are displacements force displacements and forces none of the above 19. Harmonic and Periodic Motions, Vibration Terminology.

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