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Mechanical Engineering Exam  >  Mechanical Engineering Tests  >  Test: Block Brake - Mechanical Engineering MCQ

Test: Block Brake - Mechanical Engineering MCQ


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10 Questions MCQ Test - Test: Block Brake

Test: Block Brake for Mechanical Engineering 2025 is part of Mechanical Engineering 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 course for Mechanical Engineering & Test: Block Brake solutions in Hindi for Mechanical Engineering 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 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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