Railways NTPC (Technical Ability) Engineering Mechanics and Strength of Materials Question Bank

done Engineering Mechanics and Strength of Materials Total Questions - 50

• question_answer1)
  Which of the following expressions represents Lami's theorem, if A, B, C are three are in equilibrium and as shown in figure.
  A)
   \[\frac{A}{\cos \alpha }=\frac{B}{\cos \beta }=\frac{C}{\cos \gamma }\] done clear
  B)
   \[\frac{A}{\sin \alpha }=\frac{B}{\sin \beta }=\frac{C}{\sin \gamma }\] done clear
  C)
   \[\frac{A}{{{\cos }^{2}}\alpha }=\frac{B}{{{\cos }^{2}}\beta }=\frac{C}{{{\cos }^{2}}\gamma }\]                      done clear
  D)
   None of these done clear
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• question_answer2)
  Streamlined shapes offers resistance against air flow or water flow, the magnitude of the resistance is :
  A)
   Least    done clear
  B)
   Maximum done clear
  C)
   Negative                       done clear
  D)
   Positive done clear
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• question_answer3)
  If the forces are reduced on contacting surfaces, the value of friction:
  A)
   increases                       done clear
  B)
   decreases done clear
  C)
   remains constant            done clear
  D)
   None of these done clear
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• question_answer4)
  The property due to which the material can be drawn into thin wires is knows as:
  A)
   Malleability                   done clear
  B)
   brittleness done clear
  C)
   Ductility                        done clear
  D)
   Elasticity done clear
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• question_answer5)
  The property due to which the material can be converted into thin sheets is known as :
  A)
   Ductility                        done clear
  B)
   Malleability done clear
  C)
   Hardness                      done clear
  D)
   Resilience done clear
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• question_answer6)
  The property of the material due to which the maximum amount of energy stored in a material upto fracture limit is called as:
  A)
   Hardness                      done clear
  B)
   Resilience done clear
  C)
   Plasticity                       done clear
  D)
   Toughness done clear
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• question_answer7)
  The property of the material due to which it resists against indentation is known as :
  A)
   Hardness                      done clear
  B)
   Toughness done clear
  C)
   Elasticity                       done clear
  D)
   None of these done clear
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• question_answer8)
  The work stored in a stretched wire in the form of strain energy per unit volume of wire is given by:
  A)
   \[{{U}_{V}}=\frac{1}{2}\,\,E\,\,{{(strain)}^{2}}\]        done clear
  B)
   \[{{U}_{u}}=\frac{1}{2}\,\,E\,\,(strain)\] done clear
  C)
   \[{{U}_{v}}=\frac{1}{2}\,\,E\,\,{{(stress)}^{2}}\]         done clear
  D)
   \[{{U}_{u}}=\frac{1}{2}\,\,E\,\,(stress)\] done clear
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• question_answer9)
  A beam whose one of its ends is fixed is known as :
  A)
   simply supported beam done clear
  B)
   continuous beam done clear
  C)
   cantilever beam done clear
  D)
   overhanging beam done clear
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• question_answer10)
  A beam whose both ends are fixed rigidly into the supporting walls is called as :
  A)
   continuous beam           done clear
  B)
   fixed, beam done clear
  C)
   cantilever beam done clear
  D)
   None of these done clear
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• question_answer11)
  A beam whose both ends are supported is known as :
  A)
   simply supported beam done clear
  B)
   fixed beam done clear
  C)
   overhanging beam done clear
  D)
   continuous beam done clear
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• question_answer12)
  If\[{{P}_{R}}=\]Rankin's Load, \[{{P}_{E}}=\]crippling load by Euler's formula and \[{{P}_{C}}\]crushing load, then Rankin's formula for columns is given as:
  A)
   \[\frac{1}{{{P}_{E}}}=\frac{1}{{{P}_{R}}}+\frac{1}{{{P}_{C}}}\]    done clear
  B)
   \[\frac{1}{{{P}_{C}}}=\frac{1}{{{P}_{E}}}+\frac{1}{{{P}_{R}}}\] done clear
  C)
   \[\frac{1}{{{P}_{R}}}=\frac{1}{{{P}_{E}}}-\frac{1}{{{P}_{C}}}\]     done clear
  D)
   \[\frac{1}{{{P}_{R}}}=\frac{1}{{{P}_{E}}}+\frac{1}{{{P}_{C}}}\] done clear
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• question_answer13)
  If \[{{\sigma }_{1}}\],\[{{\sigma }_{2}}\]and\[{{\sigma }_{y}}\]are maximum principal stress, minimum principal stress and yield stress, then according to maximum shear stress theory, which of the following expression satisfies:
  A)
   \[{{\sigma }_{y}}={{\sigma }_{1}}+{{\sigma }_{2}}\]              done clear
  B)
   \[{{\sigma }_{y}}={{\sigma }_{1}}-{{\sigma }_{2}}\] done clear
  C)
   \[{{\sigma }_{y}}={{\sigma }^{2}}_{1}+{{\sigma }^{2}}_{2}\]         done clear
  D)
   \[{{\sigma }_{y}}={{\sigma }^{2}}_{1}-{{\sigma }^{2}}_{2}\] done clear
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• question_answer14)
  Equilibrium equations given for non - concurrent forces are given as:
  A)
   \[\varepsilon {{F}_{X}}=0,\,\,\varepsilon {{F}_{y}}=0,\,\,\varepsilon M=0\] done clear
  B)
   \[\varepsilon {{F}_{X}}=0,\,\,\varepsilon {{F}_{y}}=0\] done clear
  C)
   \[\varepsilon {{F}_{X}}=0,\,\,\varepsilon {{F}_{y}}=0,\,\,\varepsilon M\ne 0\] done clear
  D)
   None of these done clear
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• question_answer15)
  Newton's second law of motion states that:
  A)
   Rate of change of momentum is directly proportional to the impressed force and takes place in the direction of force acting done clear
  B)
   Rate of change of momentum is inversely proportional to impressed force and takes place in the direction to opposite of force acting done clear
  C)
   To every action there is always in equal and opposite reaction done clear
  D)
   None of these done clear
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• question_answer16)
  According g to Hook's Law, stress is directly proportional to strain within:
  A)
   Plastic limit                   done clear
  B)
   yield point done clear
  C)
   elastic limit of proportionality done clear
  D)
   None of these done clear
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• question_answer17)
  Torsion equation is given as: if\[\theta \]=maximum angle of twist, j= polar moment of inertia, \[{{T}_{r}}=\]Twisting moment,\[\phi =\]maximum shear angle \[=\frac{R\theta }{L}\]
  A)
   \[\frac{{{T}_{r}}}{J}=\frac{G\theta }{L}=\frac{{{\tau }_{\max }}}{R}\]           done clear
  B)
  \[\frac{J}{{{T}_{r}}}=\frac{G\theta }{L}=\frac{R}{{{\tau }_{\max }}}\] done clear
  C)
  \[\frac{{{T}_{r}}}{L}=\frac{G\theta }{J}=\frac{{{\tau }_{\max }}}{R}\] done clear
  D)
  \[\frac{{{T}_{r}}}{{{\tau }_{\max }}}=\frac{G\theta }{L}=\frac{J}{R}\] done clear
  View Solution play_arrow

• question_answer18)
  Impact strength of a material represents:
  A)
   Hardness                      done clear
  B)
   Resilience done clear
  C)
   Ductility                        done clear
  D)
   Toughness done clear
  View Solution play_arrow

• question_answer19)
  Poisson's ratio is described as the ratio of:
  A)
   \[\frac{\text{Logitudinal}\,\,\text{strain}}{\text{Leteral}\,\,\text{strain}}\]   done clear
  B)
   \[\frac{\text{Lateral}\,\,\text{strain}}{\text{Longitudinal}\,\,\text{strain}}\] done clear
  C)
   \[\frac{\text{stress}}{\text{strain}}\] done clear
  D)
   \[\frac{\text{strain}}{\text{stress}}\] done clear
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• question_answer20)
  A cylindrical elastic body subjected to pure torsion about its axis develops:
  A)
   compressive stress in a direction\[45{}^\circ \]to the axis done clear
  B)
   shear stress in a direction \[45{}^\circ \]to the axis done clear
  C)
   tensile stress in a direction \[45{}^\circ \]to the axis done clear
  D)
   None of these done clear
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• question_answer21)
  The forces whose line of action lie on the same plane and also must at a point is known as
  A)
   co-planar non concurrent forces done clear
  B)
   co-planar concurrent forces done clear
  C)
   Non - coplanar concurrent forces done clear
  D)
   Non - coplanar-Non concurrent forces done clear
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• question_answer22)
  Range of Poisson's ratio for steel is given by:
  A)
   \[0.21-0.22\]                  done clear
  B)
   \[0.23-0.27\] done clear
  C)
   \[0.37-0.43\]                  done clear
  D)
   \[0.57-0.63\] done clear
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• question_answer23)
  If L= original length of specimen, AL = Increase in length, then the strain (e) will be equal to:
  A)
   \[\frac{L}{\Delta L}\]                             done clear
  B)
   \[L\times \Delta L\] done clear
  C)
   \[\frac{\Delta L}{L}\]                 done clear
  D)
   \[\frac{2L}{\Delta L}\] done clear
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• question_answer24)
  In case of curved beams, the bending stresses are distributed in the shape of:
  A)
   Parabola                       done clear
  B)
   ellipse done clear
  C)
   circle                            done clear
  D)
   Hyperbola done clear
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• question_answer25)
  Which of the following has given maximum principal stress theory
  A)
   Rankins            done clear
  B)
   Tresea done clear
  C)
   ST. venant                    done clear
  D)
   Mohr done clear
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• question_answer26)
  Which of the following has given maximum shear stress theory:
  A)
   Rankins            done clear
  B)
   Tresea done clear
  C)
   Mohr                done clear
  D)
   ST. venant done clear
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• question_answer27)
  If \[{{\eta }_{W}}\]efficiency of welded joint, \[\eta R\]= efficiency of riveted joint, then which of the following relation is true:
  A)
   \[{{\eta }_{W}}>{{\eta }_{R}}\]          done clear
  B)
   \[{{\eta }_{W}}<{{\eta }_{R}}\] done clear
  C)
   \[{{\eta }_{w}}={{\eta }_{R}}\]                       done clear
  D)
   \[{{\eta }_{w}}\ge {{\eta }_{R}}\] done clear
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• question_answer28)
  When the cyclic or repeated stresses are applied to the material, then its behaviour is termed as:
  A)
   creep                done clear
  B)
   fatigue done clear
  C)
   stiffness            done clear
  D)
   endurance done clear
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• question_answer29)
  Neutral plane of a beam is defined as the plane:
  A)
   whose length changes during deformation done clear
  B)
   whose length does not change during deformation done clear
  C)
   which lies at top most layer done clear
  D)
   None of these done clear
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• question_answer30)
  In case of a continous beam, which of the following statement is true?
  A)
   It has two supports at ends only done clear
  B)
   It has less than two supports done clear
  C)
   It has more than two supports done clear
  D)
   None of these done clear
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• question_answer31)
  Stiffness is measured in which of the following:
  A)
   Modulus of elasticity       done clear
  B)
   Toughness done clear
  C)
   density             done clear
  D)
   ultimate strength done clear
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• question_answer32)
  Percentage elongation is associated with which of the following terms during tensile test?
  A)
   Malleability                   done clear
  B)
   creep done clear
  C)
   Hardness                      done clear
  D)
   ductility done clear
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• question_answer33)
  Poisson's ratio generally depends on:                  
  A)
   Material of specimen                            done clear
  B)
   Area of cross section done clear
  C)
   Magnitude of load                              done clear
  D)
   None of these   done clear
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• question_answer34)
                               If \[{{\sigma }_{w}}=\] working stress, \[{{\sigma }_{w}}=\]ultimate stress then the which of the following relation is free?
  A)
   \[{{\sigma }_{w}}={{\sigma }_{u}}\]                done clear
  B)
   \[{{\sigma }_{w}}<{{\sigma }_{u}}\] done clear
  C)
   \[{{\sigma }_{w}}>{{\sigma }_{u}}\]                done clear
  D)
   None of these done clear
  View Solution play_arrow

• question_answer35)
  The point of contra flexure is found to be in which of the following beam?
  A)
   cantilever beam done clear
  B)
   Simple supported beam done clear
  C)
   overhanging beam     done clear
  D)
   None of these done clear
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• question_answer36)
  If the length of the column is doubled, the value of critical load becomes:
  A)
   \[\frac{1}{2}\times \]original value           done clear
  B)
   \[\frac{1}{8}\times \]original value done clear
  C)
   \[\frac{1}{4}\times \]original value           done clear
  D)
   \[\frac{1}{16}\times \]original value     done clear
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• question_answer37)
  True stress is associated with :
  A)
   Instantaneous cross - sectional area done clear
  B)
   Average cross - sectional area done clear
  C)
   Original cross - sectional area done clear
  D)
   Final cross - sectional area done clear
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• question_answer38)
  The unit of stress in SI system is given as :           
  A)
   \[N/m{{m}^{2}}\]                   done clear
  B)
   \[N/{{m}^{2}}\] done clear
  C)
   \[Kg/{{m}^{2}}\]                    done clear
  D)
   None of these done clear
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• question_answer39)
  If \[{{\sigma }_{T}}=\]= True stress,\[{{\sigma }_{C}}\]conventional stress, then their relationship is represented by: where \[\varepsilon \]= strain
  A)
   \[\frac{{{\sigma }_{T}}}{{{\sigma }_{c}}}=1-\varepsilon \]                    done clear
  B)
   \[\frac{{{\sigma }_{T}}}{{{\sigma }_{c}}}=\varepsilon \] done clear
  C)
   \[\frac{{{\sigma }_{c}}}{{{\sigma }_{T}}}=\varepsilon \]                       done clear
  D)
   \[\frac{{{\sigma }_{T}}}{{{\sigma }_{c}}}=1+\varepsilon \] done clear
  View Solution play_arrow

• question_answer40)
  Free Body diagram shows:
  A)
   No forces are acting of the body done clear
  B)
   All the internal forces acting on the body done clear
  C)
   All the internal and external forces acting on the body done clear
  D)
   None of these done clear
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• question_answer41)
  During tensile testing for cast iron specimen, the stress ? strain curve shows :
  A)
   No yield point done clear
  B)
   upper yield point only done clear
  C)
   lower yield point only done clear
  D)
   Both upper and lower yield points done clear
  View Solution play_arrow

• question_answer42)
  In a stress strain curve, the area under stress strain curve upto fracture shows which of the following property:
  A)
   Hardness                      done clear
  B)
   Ductility done clear
  C)
   Toughness                     done clear
  D)
   Brittleness done clear
  View Solution play_arrow

• question_answer43)
  In S.I. system of units, the unit for strain is :
  A)
   Pa                               done clear
  B)
   KPa done clear
  C)
   GPa                             done clear
  D)
   None of these done clear
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• question_answer44)
  Which of the following is a vector quantity
  A)
   Energy              done clear
  B)
   Mass done clear
  C)
   Angle               done clear
  D)
   Force done clear
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• question_answer45)
  Factor of safety is the ratio of
  A)
   breaking stress to working stress done clear
  B)
   ultimate stress to working stress done clear
  C)
   elastic limit to working stress done clear
  D)
   breaking stress to ultimate stress done clear
  View Solution play_arrow

• question_answer46)
  Effect of a force on the body will depend upon :
  A)
   Direction                       done clear
  B)
   Magnitude done clear
  C)
   Line of action    done clear
  D)
   All of the above done clear
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• question_answer47)
  The unit of moment is:
  A)
   \[N-m\]             done clear
  B)
   \[N/m\] done clear
  C)
   \[N/{{m}^{2}}\]                      done clear
  D)
   \[N/{{m}^{4}}\] done clear
  View Solution play_arrow

• question_answer48)
  The quantity, which is equal to rate of change of momentum is known to be:
  A)
   Force                done clear
  B)
   Acceleration done clear
  C)
   Impulse            done clear
  D)
   displacement done clear
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• question_answer49)
  In comparison to rolling friction, the value of sliding friction will be:
  A)
   less                              done clear
  B)
   more done clear
  C)
   equal                done clear
  D)
   double done clear
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• question_answer50)
  Tangent of angle of friction is equal to:
  A)
   kinetic friction    done clear
  B)
   Limiting friction done clear
  C)
   Frictional force   done clear
  D)
   coefficient of friction done clear
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