Machine Design MCQ

Test your knowledge with important Machine Design MCQ and their applications. These MCQs are beneficial for competitive exams too. Explore 30+ more Machine Design MCQs on Bissoy. Bissoy App

• In skew bevel gearing, the axes of shafts are
  ক

  Intersecting and the teeth are curved

  খ

  Non-intersecting and nonparallel and the teeth are curved

  গ

  Non-intersecting and non-parallel and the teeth are straight

  ঘ

  None of the above
• Endurance limit or fatigue limit is the maximum stress that a member can withstand for an infinite number of load applications without failure when subjected to
  ক

  Dynamic loading

  খ

  Static loading

  গ

  Combined static and dynamic loading

  ঘ

  Completely reversed loading
• The endurance or fatigue limit is defined as the maximum value of the stress which a polished standard specimen can withstand without failure, for infinite number of cycles, when subjected to
  ক

  Static load

  খ

  Dynamic load

  গ

  Static as well as dynamic load

  ঘ

  Completely reversed load
• The toughness of a material _________ when it is heated
  ক

  Does not change

  খ

  Increases

  গ

  Decreases

  ঘ

  None of the Above
• The maximum bending stress in a curved beam having symmetrical section always occur at the
  ক

  Centroidal axis

  খ

  Neutral axis

  গ

  Inside fiber

  ঘ

  Outside fiber
• The ball bearings are provided with a cage
  ক

  To reduce friction

  খ

  To facilitate slipping of balls

  গ

  To prevent the lubricant from flowing out

  ঘ

  To maintain the balls at a fixed distance apart
• The rivet head used for boiler plate riveting is usually
  ক

  Pan Head

  খ

  Snap head

  গ

  Counter sunk head

  ঘ

  Conical head
• A tube has the following advantage over pipe
  ক

  Lighter and easier to handle

  খ

  Greater shock absorption

  গ

  Smoother inside walls

  ঘ

  All of the above
• The minimum number of teeth on the pinion which will mesh with any gear without interference for 20° full depth involute teeth will be
  ক

  12

  খ

  14

  গ

  18

  ঘ

  24
• In a flange coupling, the keys are staggered at __________ along the circumference of the shafts in order to divide the weakening effect caused by key ways.
  ক

  90°

  খ

  135°

  গ

  160°

  ঘ

  180°
• Coaxing is the procedure of increasing
  ক

  Metal strength by cycling

  খ

  Metal hardness by surface treatment

  গ

  Metal resistance to corrosion by coating

  ঘ

  Fatigue limit by over-stressing the metal by successively increasing loadings
• Which process will increase the fatigue duration of parts?
  ক

  Finishing and polishing

  খ

  Shot-peening

  গ

  De-carburisation

  ঘ

  Electroplating
• The suitable material for belt in agricultural machinery is
  ক

  Leather

  খ

  Rubber

  গ

  Cotton duck

  ঘ

  Balata gum
• If p = bearing pressure on projected bearing area, Z = absolute viscosity of lubricant and N = speed of journal, then the bearing characteristic number is given by
  ক

  $$\frac{{{\text{ZN}}}}{{\text{p}}}$$

  খ

  $$\frac{{\text{p}}}{{{\text{ZN}}}}$$

  গ

  $$\frac{{\text{Z}}}{{{\text{pN}}}}$$

  ঘ

  $$\frac{{\text{N}}}{{{\text{Zp}}}}$$
• Idler pulley is used for
  ক

  Increasing velocity ratio

  খ

  For applying tension

  গ

  Changing the direction of motion of belt

  ঘ

  All of these
• In a hydrodynamic lubricated bearing
  ক

  There is a thick film of lubricant between the journal and the bearing

  খ

  There is a thin film of lubricant between the journal and the bearing

  গ

  The lubricant is forced between the journal and the bearing, by external pressure

  ঘ

  There is no lubricant between the journal and the bearing
• Lewis equation is applied
  ক

  Only to the pinion

  খ

  Only to the gear

  গ

  To stronger of the pinion or gear

  ঘ

  To weaker of the pinion or gear
• The velocity factor for very accurately cut and ground metallic gears operating at velocities upto __________ are equal to $$\frac{6}{{6 + {\text{v}}}}$$ .
  ক

  10 m/s

  খ

  12.5 m/s

  গ

  15 m/s

  ঘ

  20 m/s
• Rankine's theory of failure is applicable for following type of materials
  ক

  Brittle

  খ

  Ductile

  গ

  Elastic

  ঘ

  Plastic
• Guest's theory of failure is applicable for following type of materials
  ক

  Brittle

  খ

  Ductile

  গ

  Elastic

  ঘ

  Plastic
• The angle of twist of shaft is
  ক

  Directly proportional to (shaft diameter)²

  খ

  Inversely proportional to (shaft diameter)²

  গ

  Directly proportional to (shaft diameter)⁴

  ঘ

  Inversely proportional to (shaft diameter)⁴
• Turn buckle has
  ক

  Right hand threads on bout ends

  খ

  Left hand threads on both ends

  গ

  Left hand threads on one end and right hand threads on other end

  ঘ

  No threads
• If P₁ and P₂ are the tight and slack side tensions in the belt, then the initial tension P_i (neglecting centrifugal tension) will be equal to (Where, P_c is centrifugal tension)
  ক

  $${{\text{P}}_1} - {{\text{P}}_2}$$

  খ

  $${{\text{P}}_1} + {{\text{P}}_2}$$

  গ

  $$\frac{1}{2}\left( {{{\text{P}}_1} + {{\text{P}}_2}} \right)$$

  ঘ

  $$\frac{1}{2}\left( {{{\text{P}}_1} + {{\text{P}}_2}} \right) + {{\text{P}}_{\text{c}}}$$
• If P₁ and P₂ are the tight and slack side tensions in the belt, then the initial tension P_i (according to Barth) will be equal to (Where, P_c is centrifugal tension)
  ক

  $${\left( {\frac{{\sqrt {{{\text{P}}_1}} + \sqrt {{{\text{P}}_2}} }}{2}} \right)^2}$$

  খ

  $${{\text{P}}_1} + {{\text{P}}_2}$$

  গ

  $$\frac{1}{2}\left( {{{\text{P}}_1} + {{\text{P}}_2}} \right)$$

  ঘ

  $$\frac{1}{2}\left( {{{\text{P}}_1} + {{\text{P}}_2}} \right) + {{\text{P}}_{\text{c}}}$$
• The ratio of the ultimate stress to the design stress is known as
  ক

  Elastic limit

  খ

  Strain

  গ

  Factor of safety

  ঘ

  Bulk modulus
• If b denotes the face width and L denotes the cone distance for a bevel gear, then the bevel factor is written as
  ক

  $$\frac{{\text{b}}}{{\text{L}}}$$

  খ

  $$\frac{{\text{b}}}{{2{\text{L}}}}$$

  গ

  $$1 - 2{\text{bL}}$$

  ঘ

  $$1 - \frac{{\text{b}}}{{\text{L}}}$$
• The fatigue stress concentration factor is defined as
  ক

  The ratio of endurance limit with stress concentration to the endurance limit without stress concentration

  খ

  The ratio of endurance limit without stress concentration to the endurance limit with stress concentration

  গ

  The product of the endurance limits with and without stress concentration

  ঘ

  All of the above
• A leaf spring in automobiles is used
  ক

  To apply forces

  খ

  To measure forces

  গ

  To absorb shocks

  ঘ

  To store strain energy
• When an open coiled helical compression spring is subjected to an axial load (W), the compression produced in the spring will be (where, n = No. of active turns of the spring and G = Modulus of rigidity for the spring material)
  ক

  $$\frac{{2{\text{W}}{{\text{D}}^3}{\text{n}}}}{{{\text{G}}{{\text{d}}^4}}}$$

  খ

  $$\frac{{4{\text{W}}{{\text{D}}^3}{\text{n}}}}{{{\text{G}}{{\text{d}}^4}}}$$

  গ

  $$\frac{{8{\text{W}}{{\text{D}}^3}{\text{n}}}}{{{\text{G}}{{\text{d}}^4}}}$$

  ঘ

  $$\frac{{16{\text{W}}{{\text{D}}^3}{\text{n}}}}{{{\text{G}}{{\text{d}}^4}}}$$
• The objective of caulking in a riveted joint is to make the joint
  ক

  Free from corrosion

  খ

  Stronger in tension

  গ

  Free from stress

  ঘ

  Leak-proof