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Test: Couplings - 1 - Mechanical Engineering MCQ


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9 Questions MCQ Test - Test: Couplings - 1

Test: Couplings - 1 for Mechanical Engineering 2024 is part of Mechanical Engineering preparation. The Test: Couplings - 1 questions and answers have been prepared according to the Mechanical Engineering exam syllabus.The Test: Couplings - 1 MCQs are made for Mechanical Engineering 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Couplings - 1 below.
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Test: Couplings - 1 - Question 1

 A coupling is a mechanical device that temporarily joins two rotating shafts to each other.

Detailed Solution for Test: Couplings - 1 - Question 1

Explanation: A coupling permanently joins two rotating shafts.

Test: Couplings - 1 - Question 2

In distortion energy theorem, if a unit cube is subjected to biaxial stress, then S(yt) is given by which of the following?

Detailed Solution for Test: Couplings - 1 - Question 2

Explanation: S(yt)=√[(σ₁ -σ₂)²+(σ₂ -σ₃)²+(σ₃ -σ₁)²]/2, for σ₃=0; expression a is obtained.

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Test: Couplings - 1 - Question 3

 Oldham coupling i used to connect two shafts having intersecting axes.

Detailed Solution for Test: Couplings - 1 - Question 3

Explanation: Oldham coupling is used to connect two parallel shafts separated by a small distance.

Test: Couplings - 1 - Question 4

A machine started malfunctioning due to some issues with the coupling. The coupling emplaced in the machine was Oldham. The only coupling available in the workshop is Hooke’s coupling. So Oldham coupling can be replaced by Hooke’s coupling.

Detailed Solution for Test: Couplings - 1 - Question 4

Explanation: It is not possible to replace Oldham by Hooke’s coupling as Hooke’s is used to connect intersecting axes and not parallel axes shafts.

Test: Couplings - 1 - Question 5

A muff coupling is connecting two shafts. The torque involved is 650N-m. The shaft diameter is 45mm with length and breadth of the key being 14mm and 80mm respectively. Find the shear stress induced in the key.

Detailed Solution for Test: Couplings - 1 - Question 5

Explanation: τ =2M/dbl.

Test: Couplings - 1 - Question 6

 The region of safety for biaxial stresses is of which shape in the case of maximum distortion energy theorem.

Detailed Solution for Test: Couplings - 1 - Question 6

Explanation: S(yt)= √ (σ₁²- σ₁σ₂ +σ₂²) or S²(yt)= (σ₁²- σ₁σ₂ +σ₂²). This is an equation of ellipse.

Test: Couplings - 1 - Question 7

Distortion energy theorem is not recommended for ductile materials.

Detailed Solution for Test: Couplings - 1 - Question 7

Explanation: Experimental investigations have shown that distortion energy theorem gives good results for failure of ductile component.

Test: Couplings - 1 - Question 8

Among maximum shear stress theory and distortion energy theory, which gives the higher value shear yield strength?

Detailed Solution for Test: Couplings - 1 - Question 8

Explanation: Maximum shear stress theory gives S(sy)=0.5S(yt) while Distortion energy theorem gives S(sy)=0.577(Syt).

Test: Couplings - 1 - Question 9

 A muff coupling is connecting two shafts. The torque involved is 650N-m. The shaft diameter is 45mm with length and height of the key being 14mm and 80mm respectively. Find the compressive stress induced in the key.

Detailed Solution for Test: Couplings - 1 - Question 9

Explanation: σ=4M/dhl.

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