Block Brake MCQ

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• A pivoted double block brake has a drum radius of 280mm with two shoes subtending an angle of 100⁰. Maximum pressure intensity is 0.5N/mm². If the width of friction lining is 90mm, find the reaction at pivot in horizontal direction. Assume coefficient of friction as 0.2.
  ক

  None of the listed

  খ

  21123N

  গ

  17200N

  ঘ

  16789N
• A pivoted double block brake has a drum radius of 280mm with two shoes subtending an angle of 100⁰. Maximum pressure intensity is 0.5N/mm². If the width of friction lining is 90mm, find the torque capacity f each shoe. Assume coefficient of friction as 0.2.
  ক

  789N-m

  খ

  1081N-m

  গ

  945N-m

  ঘ

  None of the listed
• A pivoted double block brake has a drum radius of 280mm with two shoes subtending an angle of 100⁰. Calculate the distance of pivot from axis of drum.
  ক

  321.5mm

  খ

  314.3mm

  গ

  289.5mm

  ঘ

  None of the mentioned
• Shoe is constrained to move towards the drum to compensate for the moment acting.
  ক

  Yes

  খ

  It compensates for wear

  গ

  It compensates for both wear and moment

  ঘ

  None of the listed
• In pivoted block brakes, moment of frictional force about pivot is non zero.
  ক

  True

  খ

  False
• The equivalent coefficient of friction in case of block brake with long shoe is denoted by μ.
  ক

  . ] True

  খ

  4Sinθ/2θ+sin4θ

  গ

  4Sinθ/2θ+sin4θ

  ঘ

  4Sinθ/2θ+sin4θ
• The pressure intensity at an element on long shoe brake varies directly with the sin of the pressure angle of the element of friction lining.
  ক

  True

  খ

  False
• In a block brake with short shoe, it is assumed that friction force and normal reaction are concentrated at the midpoint of the shoe.
  ক

  True

  খ

  False
• If initially drum of radius 200mm is rotating at 100rpm, then calculate the heat generated if frictional force acting is 1140N.
  ক

  3345W

  খ

  4456W

  গ

  5969W

  ঘ

  11938W
• If torque capacity of a block brake is 240N-m and radius of drum is 210mm with coefficient of friction 0.4.
  ক

  None of the listed

  খ

  2857.14N

  গ

  3443.42N

  ঘ

  2334.62N
• Block brakes are never used in railway trains.
  ক

  True

  খ

  False