B.TechSemester 52023-24Mechanical VibrationsKME057

Mechanical Vibrations (KME057) - AKTU Question Paper 2023-24

B.Tech · Semester 5 · Free PDF Download

This is the official AKTU Mechanical Vibrations Previous Year Question Paper for B.Tech Semester 5, academic session 2023-24. Published by Dr. A.P.J. Abdul Kalam Technical University (AKTU/UPTU), Lucknow. Free PDF download — no login required.

Course:B.Tech

Semester:Semester 5

Session:2023-24

University:AKTU / UPTU

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Questions Asked in 2023-24

Mechanical Vibrations (KME057) — extracted question text · 100 marks · 3 Hours

Section AAttempt all questions in brief.

a
What is mean by Frequency? 2 1
b
What are the effects of vibration? 2 1
d
What is meant by Forced vibrations? 2 1
e
Write a short note on simple Harmonic motion. 2 1
f
Write short notes on D’Alembert’s principle. 2 1
g
Define Single Degree Freedom? 2 1
h
Define Multi‐degree Freedom system? 2 1 i. Define Critical speed of shafts? 2 1 j. Define Principle of vibration absorber? 2 1

Section BAttempt any three of the following:

a
Define Vibrations of systems with viscous damping? 10 2
b
Define Harmonic excitation with viscous damping ? Also define steady state vibrations
c
Give Note on (i) Vibration isolators (ii) Vibration Dampers. 10 2
d
Define Newton s Second Law to Derive Equations of Motion? 10 2
e
Explain Undamped free and forced vibration of multi degree freedom system? 10 2

Section CAttempt any one part of the following:

a
A cantilever beam carries a mass M at the free end as shown in Fig. A mass m falls from a height h onto the mass M and adheres to it without rebounding. Determine the resulting transverse vibration of the beam
b
Explain the classifications of vibration with examples. 10 3
a
A reciprocating pump, weighing 150 lb, is mounted at the middle of a steel plate of thickness 0.5 in., width 20 in., and length 100 in., clamped along two edges as shown in Fig. During operation of the pump, the plate is subjected to
a
harmonic force, F(t) = 50 Cos 62.832t lb. Find the amplitude of vibration of the plate
b
Define Vibration measuring instruments with suitable sketch. 10 4
a
Find the natural frequencies and mode shapes of a spring-mass system, shown in Fig, which is constrained to move in the vertical direction only. Take n=1
b
Define the Principle of vibration absorber? Also define Undamped Dynamic Vibration Absorber?
a
Find the stiffness influence coefficients of the system shown in Fig
b
Estimate the fundamental natural frequency of a simply supported beam carrying three identical equally spaced masses, as shown in Fig
a
A shaft, carrying a rotor of weight 100 lb and eccentricity 0.1 in., rotates at 1200 rpm. Determine (a) the steady-state whirl amplitude and (b) the maximum whirl amplitude during start-up conditions of the system. Assume the stiffness of the shaft as 2 x 105 lb/in. and the external damping ratio as 0.1
b
Define Secondary critical speed of shaft? 10 5

Question text is extracted from the official AKTU question paper PDF above. Check the original PDF for equations, diagrams and complete wording. Extracted: 2026-08-23.

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