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Roll No. ‘ ‘ ‘ ‘ ‘ ‘ ‘ ‘ ‘ ‘ ‘ Total No. of Pages : 02
Total No. of Questions : 18
B.Tech (Civil Engg.) (2018 & Onwards) (Sem.-1,2)
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MECHANICS OF SOLIDSSubject Code : BTPH-101-18
M.Code : 75351
Time : 3 Hrs. Max. Marks : 60
INSTRUCTIONS TO CANDIDATES :
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- SECTION-A is COMPULSORY consisting of TEN questions carrying TWO marks each.
- SECTION -B & C have FOUR questions each.
- Attempt any FIVE questions from SECTION B & C carrying EIGHT marks each.
- Select atleast TWO questions from SECTION - B & C.
SECTION-A
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Write briefly :
- What are the properties of equipotential surfaces?
- Differentiate between rotational and irrotational force field.
- Define Centripetal and Coriolis accelerations.
- Discuss the energy decay in a damped harmonic oscillator.
- Write the differential equations of motion for a particle executing simple, damped and forced oscillations.
- State the parallel-axis and perpendicular axis theorems of moment of inertia.
- Define a Rigid Body.
- Justify the statement, “friction is a necessary evil”.
- Give some methods to increase and decrease friction.
- State the generalized Hooke’s law. How it is different to special form of Hooke’s law?
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SECTION-B
- a) Define the potential energy function (F) and show that F = Grad V. 4
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b) Make a summary of different forces in nature. 4 - Using Newton’s laws of motion, deduce the conservation theorems of angular momentum and energy for the motion of a system of particles. 44
- Discuss the methods (logarithmic decrement, relaxation time and quality factor) for quantitative measurement of damping effect in a damped simple harmonic oscillator. 3,3,2
- What are forced oscillations? Establish a differential equation of motion for a forced harmonic oscillator and obtain an expression of displacement. Discuss the cases of forced oscillations. 1,5,2
SECTION-C
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- a) Derive the expression for angular momentum about a point of a rigid body in planar motion. 4
b) Define : Centre of mass and momentum of inertia. 4 - a) State perpendicular axis theorem of inertia and prove it. 5
b) Derive the expression for the moment of inertia of a circular ring about its centre. 3 - a) Discuss different types of friction. Why rolling friction is less than kinetic friction? 4
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b) State all laws of static and limiting friction. 4 - a) Define stress and strain and their different types. 5
b) Explain Generalized Hooke’s law. 3
NOTE : Disclosure of Identity by writing Mobile No. or Making of passing request on any page of Answer Sheet will lead to UMC against the Student.
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This download link is referred from the post: PTU B.Tech Question Papers 2020 December (All Branches)