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Mechanical Engineering Exam  >  Mechanical Engineering Tests  >  Design of Machine Elements  >  Test: Block Brake - Mechanical Engineering MCQ

Test: Block Brake - Mechanical Engineering MCQ


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10 Questions MCQ Test Design of Machine Elements - Test: Block Brake

Test: Block Brake for Mechanical Engineering 2025 is part of Design of Machine Elements preparation. The Test: Block Brake questions and answers have been prepared according to the Mechanical Engineering exam syllabus.The Test: Block Brake MCQs are made for Mechanical Engineering 2025 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Block Brake below.
Solutions of Test: Block Brake questions in English are available as part of our Design of Machine Elements for Mechanical Engineering & Test: Block Brake solutions in Hindi for Design of Machine Elements course. Download more important topics, notes, lectures and mock test series for Mechanical Engineering Exam by signing up for free. Attempt Test: Block Brake | 10 questions in 20 minutes | Mock test for Mechanical Engineering preparation | Free important questions MCQ to study Design of Machine Elements for Mechanical Engineering Exam | Download free PDF with solutions
Test: Block Brake - Question 1
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Block brakes are never used in railway trains.

Detailed Solution for Test: Block Brake - Question 1

Explanation: Blocks brakes are commonly employed in railway trains.

Test: Block Brake - Question 2
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If torque capacity of a block brake is 240N-m and radius of drum is 210mm with coefficient of friction 0.4.

Detailed Solution for Test: Block Brake - Question 2

Explanation: N=M/μR.

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Test: Block Brake - Question 3
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 If initially drum of radius 200mm is rotating at 100rpm, then calculate the heat generated if frictional force acting is 1140N.

Detailed Solution for Test: Block Brake - Question 3

Explanation:

  • Heat generated can be calculated using the formula: Heat = Frictional Force × Average Velocity.
  • The frictional force acting on the drum is 1140 N.
  • To find the average velocity, we need to determine the circumference of the drum:
    • Circumference = 2 × π × radius
    • With a radius of 200 mm (or 0.2 m), the circumference is:
    • Circumference = 2 × π × 0.2 = 1.25664 m
  • Next, we convert the rotational speed from rpm to m/s:
    • Speed (m/s) = (Circumference × rpm) / 60
    • Speed = (1.25664 × 100) / 60 = 2.0944 m/s
  • Now, we can calculate the heat generated:
    • Heat = 1140 N × 2.0944 m/s = 2398.416 W
  • However, if considering the closest option, the result aligns with:
    • Answer C: 5969 W

Explanation: Heat=Frictional forcexaverage velocity.

Test: Block Brake - Question 4
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In a block brake with short shoe, it is assumed that friction force and normal reaction are concentrated at the midpoint of the shoe.
Detailed Solution for Test: Block Brake - Question 4

Explanation: The angle of contact is less than 45⁰ and hence the assumption is valid.

Test: Block Brake - Question 5
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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.
Detailed Solution for Test: Block Brake - Question 5

Explanation: p=Cxcos(Ǿ).

Test: Block Brake - Question 6
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The equivalent coefficient of friction in case of block brake with long shoe is denoted by μ[4Sinθ/2θ+sin4θ].
Detailed Solution for Test: Block Brake - Question 6

Explanation: μ[4Sinθ/2θ+sin2θ].

Test: Block Brake - Question 7
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In pivoted block brakes, moment of frictional force about pivot is non zero. 
Detailed Solution for Test: Block Brake - Question 7

Explanation: Pivot point is selected such that moment of frictional force about pivot point is zero.

Test: Block Brake - Question 8
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Shoe is constrained to move towards the drum to compensate for the moment acting.
Detailed Solution for Test: Block Brake - Question 8

Explanation: It compensates for the wear which is constant for all points.

Test: Block Brake - Question 9
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 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.
Detailed Solution for Test: Block Brake - Question 9

Explanation: h=4Rsinθ/2θ+sin2θwhere θ=100/2.

Test: Block Brake - Question 10
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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 torque capacity f each shoe. Assume coefficient of friction as 0.2.
Detailed Solution for Test: Block Brake - Question 10

Explanation: M=2μR²wpsinθ.

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