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Test: Work and Energy Principle - Civil Engineering (CE) MCQ


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10 Questions MCQ Test - Test: Work and Energy Principle

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

To apply virtual work method it is :-

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Since we are equating work done, it compulsory for them to be in equilibrium.

Test: Work and Energy Principle - Question 2

What is the relation between work done by external loads and work done by internal loads.

Detailed Solution for Test: Work and Energy Principle - Question 2

External and internal displacements must be related by compatibility of displacement.

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Test: Work and Energy Principle - Question 3

Virtual work method can be applied when

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It is required for structure to be stable for application of this method.

Test: Work and Energy Principle - Question 4

Virtual work can be applied when:-

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As after elastic limit, work done can’t be equated.

Test: Work and Energy Principle - Question 5

What is the shape of load-deformation curve for a non-linear elastic member?

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In these cases, each one has unique relationship between load and deformation.

Test: Work and Energy Principle - Question 6

What is the shape of load-deformation curve for a linear elastic member?

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In these cases, both are directly proportional.

Test: Work and Energy Principle - Question 7

Conservation of energy will be applicable only when:-

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In cases of dynamic load, acceleration may occur and some of the external work will be transferred into kinetic energy.

Test: Work and Energy Principle - Question 8

What is the relation between work done and complementary work done?

Detailed Solution for Test: Work and Energy Principle - Question 8

They are equal only when Hooke’s law is applicable i.e. the material is linearly elastic.

Test: Work and Energy Principle - Question 9

A bucket of water weighing 10 kg is pulled up from a 20 m deep well by a rope weighing 1 kg/m length, then the work done is _______.

Detailed Solution for Test: Work and Energy Principle - Question 9

Work  done = Force applied × Displacement 
Calculation
Here 10 kg block will be displaced by 20m hence work done displace bucket by 20 meters = 10 × 20 = 200 kg-m and the total weight of rope mass per unit length ×  length = 1 × 20 = 20kg and it will be concentrated at the center of the rope hence net displacement of rope = 10m, therefore, work done to displace rope 20 × 10 = 200 kg-m
Hence net work done  = 200 + 200 = 400 kg-m

Test: Work and Energy Principle - Question 10

Work done by conservative force is equal to

Detailed Solution for Test: Work and Energy Principle - Question 10

Non-conservative forces:

  • A non-conservative force is one for which work depends on the path taken.
  • Friction is an example of a non-conservative force that changes mechanical energy into thermal energy.
  • Work Wnc done by a non-conservative force changes the mechanical energy of a system.
  • In equation form, Wnc = ΔKE + ΔPE or, equivalently, KEi + PEi = Wnc + KEf + PEf.

Conservative forces:

  • A conservative force is one, for which work done by or against it depends only on the starting and ending points of a motion and not on the path taken. 
  • Example potential energy, gravitational force etc.
  • Work done by conservative force is equal to decrease in potential energy.
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