Railways NTPC (Technical Ability) Theory of Machines and Machine Design Question Bank

done Theory of Machines and Machine Design Total Questions - 50

• question_answer1)
  A cam with a roller follower would constitute following type of pair
  A)
   lower pair                      done clear
  B)
   higher pair done clear
  C)
   open pair                      done clear
  D)
   close pair done clear
  View Solution play_arrow

• question_answer2)
  In most machine members, the damping capacity of the material should be
  A)
   low                              done clear
  B)
   zero done clear
  C)
   high                 done clear
  D)
   could be anything done clear
  E)
   None of the above done clear
  View Solution play_arrow

• question_answer3)
  According to I.S. specification, 100 H6g5 means that
  A)
   tolerance grade for the hole is 6 and for the shaft is 5 done clear
  B)
   tolerance grade for the shaft is 6 and for the hole is 5 done clear
  C)
   tolerance grade for the shaft is 4 to 8 and for the hole is 3 to 7 done clear
  D)
   tolerance grade for the hole is 4 to 8 for the shaft is 3 to 7 done clear
  View Solution play_arrow

• question_answer4)
  Gears are casted by
  A)
   sand mould casting     done clear
  B)
   slush casting done clear
  C)
   permanent mould casting done clear
  D)
   centrifugal casting done clear
  View Solution play_arrow

• question_answer5)
  If the controlling force of a governor increases within crease in speed, the governor is said to be
  A)
   sensitive                        done clear
  B)
   insensitive done clear
  C)
   isochronous                   done clear
  D)
   powerful done clear
  View Solution play_arrow

• question_answer6)
  Kinematic pairs are those which have
  A)
   point or line contact between the two elements when in motion done clear
  B)
   surface contact between the two elements when in motion done clear
  C)
   elements of pairs not held together mechanically done clear
  D)
   two elements that permit relative motion done clear
  View Solution play_arrow

• question_answer7)
  A porter governor could be classified as could be classified as
  A)
   inertia type governor done clear
  B)
   pendulum type governor done clear
  C)
   centrifugal type governor done clear
  D)
   dead weight type governor done clear
  View Solution play_arrow

• question_answer8)
  Lower pairs are those which have
  A)
   point or line contact between the two elements when in motion                   done clear
  B)
   surface contact between the two elements when in motion done clear
  C)
   elements of pairs not held together mechanically done clear
  D)
   two elements that permit relative motion done clear
  View Solution play_arrow

• question_answer9)
  Pulley in a belt drive acts as
  A)
   cylindrical pair   done clear
  B)
   turning pair done clear
  C)
   rolling pair                     done clear
  D)
   sliding pair done clear
  View Solution play_arrow

• question_answer10)
  Taper on the cotter and slot is provided
  A)
   on both the sides            done clear
  B)
   on one side only done clear
  C)
   on none of the sides done clear
  D)
   may be provided anywhere done clear
  View Solution play_arrow

• question_answer11)
  Rankine's theory of failure is applicable for following type of materials
  A)
   brittle   done clear
  B)
   ductile done clear
  C)
   elastic               done clear
  D)
   plastic done clear
  View Solution play_arrow

• question_answer12)
  A steel containing 0.85% carbon is known as
  A)
   eutectoid steel                done clear
  B)
   hyper-eutectoid steel done clear
  C)
   hypo-eutectoid steel   done clear
  D)
   None of the above done clear
  View Solution play_arrow

• question_answer13)
  Length of cross belt, in addition to centre length, depends
  A)
   only on the sum of the radii of pulleys done clear
  B)
   on the sum and differance of the radii of tins pulleys done clear
  C)
   square of difference of radii of the pulleys done clear
  D)
   square of sum of radii of pulleys done clear
  View Solution play_arrow

• question_answer14)
  The approximate straight line mechanism is a
  A)
   four bar linkage  done clear
  B)
   6 bar linkage done clear
  C)
   8 bar linkage                 done clear
  D)
   3 bar linkage done clear
  View Solution play_arrow

• question_answer15)
  The coriolis component of acceleration leads the sliding velocity by
  A)
   \[45{}^\circ \]                          done clear
  B)
   \[90{}^\circ \] done clear
  C)
   \[135{}^\circ \]            done clear
  D)
   \[180{}^\circ \] done clear
  View Solution play_arrow

• question_answer16)
  In composite or reverse laid ropes
  A)
   direction of twist of wires in strands is opposite to the direction of twist of strands done clear
  B)
   direction of twist of wires and strands are same done clear
  C)
   wires in two adjacent strands are twisted in opposite direction done clear
  D)
   wires are not twisted done clear
  View Solution play_arrow

• question_answer17)
  Which of the following is not correct procedure to increase the fatigue limit?         
  A)
   Cold working                 done clear
  B)
   Shot peening done clear
  C)
   Surface decarburisation done clear
  D)
   Under-stressing done clear
  View Solution play_arrow

• question_answer18)
  Belt slip may occur due to
  A)
   heavy load                    done clear
  B)
   loose belt done clear
  C)
   driving pulley too small   done clear
  D)
   All of the above done clear
  View Solution play_arrow

• question_answer19)
  The term "effort of governor" refers to
  A)
   centrifugal force of balls done clear
  B)
   useful power developed done clear
  C)
   force acting on sleeve for given % change of speed done clear
  D)
   minimum force required on sleeve for % change of speed done clear
  View Solution play_arrow

• question_answer20)
  Cam angle is defined as the angle
  A)
   during which the follower returns to its initial position done clear
  B)
   of rotation of the cam for a definite displacement of the follower done clear
  C)
   through which the cam rotates during the period in which the follower remains in the highest position done clear
  D)
   moved by the cam from the instant the follower begins to rise, till it reaches its highest position done clear
  View Solution play_arrow

• question_answer21)
  When two springs are in series (having stiffness K), the equivalent stiffness will be
  A)
   K                                 done clear
  B)
   K/2 done clear
  C)
   2KL                             done clear
  D)
   K/4 done clear
  View Solution play_arrow

• question_answer22)
  In the case of an elastic bar fixed at upper end loaded by a falling weight at lower end, the shock olad produced can be decreased by
  A)
   decreasing the cross-section area of bar done clear
  B)
   increasing the cross-section area of bar done clear
  C)
   remain unaffected with cross-section area done clear
  D)
   would depend upon other factors done clear
  View Solution play_arrow

• question_answer23)
  Length of open belt, in addition to centre length, depends
  A)
   only on the sum of the radii of pulleys done clear
  B)
   on the sum and difference of the radii of the pulleys done clear
  C)
   square of difference of radii of pulleys done clear
  D)
   square of sum of radii of pulleys done clear
  View Solution play_arrow

• question_answer24)
  Which one of the following is a criterion in the design of hydrodynamic journal bearings?
  A)
   Sommer field number done clear
  B)
   Rating life done clear
  C)
   Specific dynamic capacity done clear
  D)
   Rotation factor done clear
  View Solution play_arrow

• question_answer25)
  Which of the following bearing is suitable for fluctuating demands?
  A)
   Needle roller bearing       done clear
  B)
   Ball bearing done clear
  C)
   Tapered bearing done clear
  D)
   Cylindrical bearing done clear
  View Solution play_arrow

• question_answer26)
  Which of the following is a positive locking device?
  A)
   Castled nut                   done clear
  B)
   Locking by pin done clear
  C)
   Locking by threaded pin done clear
  D)
   Split nut done clear
  View Solution play_arrow

• question_answer27)
  Deep groove ball bearings are used for
  A)
   heavy thrust load only done clear
  B)
   small angular displacement of shafts done clear
  C)
   radial load at high speed done clear
  D)
   combined thrust and radial loads at high speed done clear
  View Solution play_arrow

• question_answer28)
  Which of the following key is under compression rather than in being shear when under load?
  A)
   Saddle              done clear
  B)
   Barth done clear
  C)
   Feather             done clear
  D)
   Kennedy done clear
  View Solution play_arrow

• question_answer29)
  Which of the following is maximum capacity bearing?
  A)
    Filling notch bearing    done clear
  B)
   Single row bearing done clear
  C)
   Angular contact bearing done clear
  D)
   Self-aligning bearing done clear
  View Solution play_arrow

• question_answer30)
  A kinematic pair consists of which of the following:
  A)
   two elements that permit relative motion done clear
  B)
   two elements that are connected to each other done clear
  C)
   two elements that do not permit relative motion done clear
  D)
   None of these done clear
  View Solution play_arrow

• question_answer31)
  A link that connects double slider crank chain fraces the path of which of the following shape?
  A)
   an elliptical path            done clear
  B)
   a circular path done clear
  C)
   a straight path   done clear
  D)
   a hyperbolic path done clear
  View Solution play_arrow

• question_answer32)
  Universal joint is an example of which of the following type of pair:
  A)
   Higher pair        done clear
  B)
   Lower pair done clear
  C)
   Rolling pair                    done clear
  D)
   None of these done clear
  View Solution play_arrow

• question_answer33)
  Which of the following pair, a ball and socket joint forms?
  A)
   Spherical pair    done clear
  B)
   Rolling pair done clear
  C)
   Turning pair                  done clear
  D)
   Sliding pair done clear
  View Solution play_arrow

• question_answer34)
  The safe rim velocity of a flywheel is influenced by:
  A)
   Mass of the flywheel       done clear
  B)
   energy fluctuation done clear
  C)
   centrifugal stresses          done clear
  D)
   speed fluctuation done clear
  View Solution play_arrow

• question_answer35)
  Porter governor is a:
  A)
   Pendulum type governor done clear
  B)
   Dead weight type governor done clear
  C)
   Spring loaded type governor done clear
  D)
   Inertia type governor done clear
  View Solution play_arrow

• question_answer36)
  In case of an isochronous governor, the value of sensitivity is:
  A)
   infinity  done clear
  B)
   zero done clear
  C)
   one                              done clear
  D)
   None of these done clear
  View Solution play_arrow

• question_answer37)
  Which one of the following governors cannot be isochronous?
  A)
   Hartnell                        done clear
  B)
   Porter done clear
  C)
   Watt                            done clear
  D)
   Hartung done clear
  View Solution play_arrow

• question_answer38)
  The size of the cam depends upon:
  A)
   Base circle        done clear
  B)
   Pitch circle done clear
  C)
   Prime circle                   done clear
  D)
   None of these done clear
  View Solution play_arrow

• question_answer39)
  Cam used for low and moderate speed engines should move with:
  A)
   uniform velocity done clear
  B)
   Harmonic motion done clear
  C)
   uniform acceleration       done clear
  D)
   cycloidal motion done clear
  View Solution play_arrow

• question_answer40)
  For a simple harmonic motion of a cam follower, a cosine curve shows :
  A)
   acceleration diagram      done clear
  B)
   displacement diagram done clear
  C)
   velocity diagram       done clear
  D)
   All of the above done clear
  View Solution play_arrow

• question_answer41)
  The outer circle of spur gear is called:
  A)
   pitch circle                    done clear
  B)
   base circle done clear
  C)
   addendum circle done clear
  D)
   dedeundum circle done clear
  View Solution play_arrow

• question_answer42)
  Creep in a belt occurs due to:
  A)
   uneven contraction and extension of the belt done clear
  B)
   weak material of the pulley done clear
  C)
   weak material of the belt done clear
  D)
   improper crowning done clear
  View Solution play_arrow

• question_answer43)
  If in case of disc clutch,\[{{N}_{1}}\]= Number of discs on driving shaft \[{{N}_{2}}\]= Number of discs on driving shaft then, number of pairs of contact surfaces will be:
  A)
   \[{{N}_{1}}-{{N}_{2}}+1\]                 done clear
  B)
   \[{{N}_{1}}-{{N}_{2}}-1\] done clear
  C)
   \[{{N}_{1}}+{{N}_{2}}+1\]               done clear
  D)
   \[{{N}_{1}}+{{N}_{2}}-1\] done clear
  View Solution play_arrow

• question_answer44)
  Which of the following clutches is positive type?
  A)
   jaw                              done clear
  B)
   cone done clear
  C)
   disc                              done clear
  D)
   centrifugal done clear
  View Solution play_arrow

• question_answer45)
  The included angle of V - belt is generally:
  A)
   \[10{}^\circ -20{}^\circ \]                    done clear
  B)
   \[20{}^\circ -30{}^\circ \] done clear
  C)
   \[30{}^\circ -40{}^\circ \]        done clear
  D)
   \[40{}^\circ -50{}^\circ \] done clear
  View Solution play_arrow

• question_answer46)
  The diamond riveting is utilized for:
  A)
   structural work done clear
  B)
   boiler work done clear
  C)
   both structural and boiler work done clear
  D)
   None of these done clear
  View Solution play_arrow

• question_answer47)
  A rivet is specified by:
  A)
   shank diameter  done clear
  B)
   type of load done clear
  C)
   length of rivet                done clear
  D)
   None of these done clear
  View Solution play_arrow

• question_answer48)
  Which of the following type of material, the rivets are made?
  A)
   brittle               done clear
  B)
   ductile done clear
  C)
   high density                   done clear
  D)
   None of these done clear
  View Solution play_arrow

• question_answer49)
  Lewis equation in case of gears is used to find the:
  A)
   Bending stress    done clear
  B)
   Tensile stress done clear
  C)
   compressive stress          done clear
  D)
   All of these done clear
  View Solution play_arrow

• question_answer50)
  Which type of teeth are normally used and satisfy law of gearing?
  A)
   conjugate teeth  done clear
  B)
   cycloidal teeth done clear
  C)
   involute teeth                done clear
  D)
   All of these done clear
  View Solution play_arrow