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Mechanical Engineering Exam  >  Mechanical Engineering Tests  >  Design of Machine Elements  >  Test: Efficiency Of Screws - Mechanical Engineering MCQ

Test: Efficiency Of Screws - Mechanical Engineering MCQ


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10 Questions MCQ Test Design of Machine Elements - Test: Efficiency Of Screws

Test: Efficiency Of Screws for Mechanical Engineering 2024 is part of Design of Machine Elements preparation. The Test: Efficiency Of Screws questions and answers have been prepared according to the Mechanical Engineering exam syllabus.The Test: Efficiency Of Screws MCQs are made for Mechanical Engineering 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Efficiency Of Screws below.
Solutions of Test: Efficiency Of Screws questions in English are available as part of our Design of Machine Elements for Mechanical Engineering & Test: Efficiency Of Screws 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: Efficiency Of Screws | 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: Efficiency Of Screws - Question 1
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Efficiency of screw depends upon lead of the screw.

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Explanation: Efficiency= WL/[Pπd].

Test: Efficiency Of Screws - Question 2
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Efficiency of the screw depends upon helix angle but does not depend on friction angle.

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Explanation: Efficiency=tan(ἀ)/tan(Ǿ+ἀ) where ἀ=Helix angle and Ǿ=Friction angle.

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Test: Efficiency Of Screws - Question 3
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 Efficiency of the screw _______ with increase of coefficient of friction.

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Explanation: Efficiency is inversely proportional to tan of the sum of helix and efficiency angle.

Test: Efficiency Of Screws - Question 4
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Maximum efficiency of a square threaded is given by
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Explanation: Efficiency=Sin(2ἀ+Ǿ)-Sin Ǿ /Sin(2 ἀ+Ǿ+Sin Ǿ),For max efficiency, sin(2ἀ+ Ǿ)=1.

Test: Efficiency Of Screws - Question 5
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If friction angle is 30’ then the maximum efficiency of the screw is
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Explanation: Maximum efficiency=1-sinǾ/1+sinǾ.

Test: Efficiency Of Screws - Question 6
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Maximum possible efficiency of a self-locking screw is
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Explanation: For self locking screw Ǿ(friction angle)>ἀ (helix angle), hence efficiency < tanǾ/tan(Ǿ+ἀ) or efficiency < tanǾ(1-tan²Ǿ)/2tanǾ.

Test: Efficiency Of Screws - Question 7
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In trapezoidal threads, f (coefficient of friction) can be taken as
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Explanation: The normal force acting on the thread is W sec θ therefore the effect of the thread angle is to increase the frictional force by a term sec θ.

Test: Efficiency Of Screws - Question 8
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Clutch and coupling can be considered to be same.
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Explanation: Clutch is a temporary join while coupling is a permanent joint.

Test: Efficiency Of Screws - Question 9
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Cold rolled components have higher strengths and hardness than hot rolled components.
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Explanation: During grain re-structuring, original strength of material is lost.

Test: Efficiency Of Screws - Question 10
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Which of the following are true?
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Explanation: Properties of cold working.

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