Products MCQ

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• DQ and DQ2 are the two types bearings produced by Glacier Metal Co. Ltd. by dispersing brass and Pb respectively.
  ক

  True

  খ

  False
• The performance of P.T.F.E /metal bearings largely depends on _________
  ক

  Base material

  খ

  Compacting pressure

  গ

  Journal material

  ঘ

  Sintering temperature
• Which of the following is the limitation of aqueous impregnation method?
  ক

  Easy to get a penetration depth > 0.01”

  খ

  Suitable for flat sheets only

  গ

  Suitable for curved sections only

  ঘ

  No loss of P.T.F.E by extrusion
• Which of the following are methods for impregnating the metallic matrix with P.T.F.E, according to Blainey?
  ক

  Hot pressing

  খ

  Hot rolling, and aqueous impregnation

  গ

  Hot rolling

  ঘ

  Hot pressing, and aqueous impregnation
• Which of the following is a drawback of the P.T.F.E material for bearings?
  ক

  High thermal expansion

  খ

  High thermal conductivity

  গ

  High shear strength

  ঘ

  Non-toxic
• Which of the following is not a feature related to the P.T.F.E material for bearings?
  ক

  Low coefficient of friction

  খ

  Sintering temperature is 90°C

  গ

  Sintering temperature is 900°C

  ঘ

  Chemical stability from -200°C up to 300°C
• _________ are used in hot water circulating pump.
  ক

  P.T.F.E bearing

  খ

  Non-porous bearing

  গ

  Infiltrated bearing

  ঘ

  Dry-lubricated bearing incorporating graphite
• Overlay layer of lead-tin alloy on copper-lead alloy has reduced fatigue properties.
  ক

  True

  খ

  False
• _________ are employed in gearboxes.
  ক

  Copper-lead bearings

  খ

  Lead-tin alloy

  গ

  Self-lubricating bearing

  ঘ

  Infiltrated bearing
• __________ is used in food industries.
  ক

  P.T.F.E bearing

  খ

  Non-porous bearing

  গ

  Infiltrated bearing

  ঘ

  Dry-lubricated bearing incorporating graphite
• ________ clearance for higher PV values are required.
  ক

  Small

  খ

  Large

  গ

  Moderate

  ঘ

  Nil
• The ratio of interference to bore closure doesn’t rely on ______
  ক

  density of bearing

  খ

  rigidity of housing

  গ

  density of shaft

  ঘ

  strength of bearing
• The radial crushing strength of a bearing is given by _______
  ক

  P=KLT2/(D-T)

  খ

  P=KLT2/(T-D)

  গ

  P=KDT2/(L-T)

  ঘ

  P=KLT3/(T-D)
• The performance factor is given by ______
  ক

  PV

  খ

  VF

  গ

  AV

  ঘ

  FA
• Under which of the following mechanisms the bearing performance depends on the ability of the lubricant to maintain a boundary film under load?
  ক

  Hydrostatic lubrication

  খ

  Boundary film lubrication

  গ

  Hydrodynamic lubrication

  ঘ

  Aerodynamic lubrication
• _________ is possible only with the help of a pump during starting.
  ক

  Hydrostatic lubrication

  খ

  Boundary film lubrication

  গ

  Hydrodynamic lubrication

  ঘ

  Aerodynamic lubrication
• _______ is obtained by subtracting the density (%) of the material from 100.
  ক

  Hardness

  খ

  Porosity

  গ

  Specific gravity

  ঘ

  Ductility
• Which type of porosity is connected to one another and to the external surface?
  ক

  Moderate

  খ

  Open

  গ

  Closed

  ঘ

  Interconnected
• ________ type of porosity serves no purpose and must be minimized.
  ক

  Moderate

  খ

  Open

  গ

  Closed

  ঘ

  Interconnected
• Which of the following is not a characteristic of a P/M bearing material?
  ক

  Ability to withstand both static and impact loads

  খ

  Good wear characteristics

  গ

  Good heat dissipation capacity

  ঘ

  Short service life
• The load carrying capacity of bearing is expressed as the _______
  ক

  efficiency factor

  খ

  work factor

  গ

  performance factor

  ঘ

  capability factor
• What is the PV value for thrust bearings?
  ক

  10,000

  খ

  50,000

  গ

  20,000

  ঘ

  30,000
• P/M bearings may be of the type ____________
  ক

  dry type containing aluminum

  খ

  porous type infiltrated with a lubricant

  গ

  dry type containing teflon

  ঘ

  porous type infiltrated with a lubricant, dry type containing teflon
• The porous-metal bearings are used where re-lubrication is difficult.
  ক

  True

  খ

  False
• What is the property of material for the application of fractional-horsepower motor bearings?
  ক

  Moderate porosity

  খ

  Low porosity

  গ

  Minimum lubricating oil

  ঘ

  High porosity
• Which kind of bearing material is suitable for oscillating and reciprocating motions?
  ক

  Low-graphite content

  খ

  High graphite content

  গ

  High-oil content

  ঘ

  High porosity
• Dry bearing is made up of ______ with metal backing of _______ is available.
  ক

  teflon, aluminum

  খ

  aluminum, teflon

  গ

  leaded bronze, aluminum

  ঘ

  teflon, bismuth
• Which of the following is not a feature of oil-impregnated bearings?
  ক

  Excellent self-lubrication properties

  খ

  Wide range of operating temperature

  গ

  High-thermal expansion

  ঘ

  Low-thermal expansion
• Copper is added to iron-copper-graphite powder mix to suppress the formation of ________
  ক

  Cementite

  খ

  Iron oxide

  গ

  Copper oxide

  ঘ

  Ledeburite
• What is the pore volume in bearing materials?
  ক

  14-20%

  খ

  17-30%

  গ

  11-50%

  ঘ

  28-43%