Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2018 Winter 6th Sem Old 161901 Dynamics Of Machinery Previous Question Paper
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Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?VI (OLD) EXAMINATION ? WINTER 2018
Subject Code:161901 Date: 07/12/2018
Subject Name: Dynamics Of Machinery
Time: 02:30 PM TO 05:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
Q-1 A Define Static and Dynamic balancing with suitable example. 7
B Explain Vibration isolation and transmissibility 7
Q-2 A Write down short note on Variation of Tractive Force, Swaying couple and
Hammer Blow.
7
B Explain concept of Direct and Reverse Crank. 7
OR
B Four masses m1, m2, m3 and m4 are 200 kg, 300 kg, 240 kg and 260 kg
respectively. The corresponding radii of rotation are 0.2 m, 0.15 m, 0.25 m and
0.3 m respectively and the angles between successive masses are 45?, 75? and
135?. Find the position and magnitude of the balance mass required, if its radius
of rotation is 0.2 m.
7
Q-3 A Discuss different cases showing the characteristics of the system performance for
a damped free vibration.
7
B Describe Dunkerley?s method to find the natural frequency of a shaft carrying
several loads.
7
OR
Q-3 A Explain Hozer?s method to determine natural frequencies of multi-rotor system. 7
B What are various frequency measuring instruments? Explain any one in detail. 7
Q-4 A Define logarithmic decrement and derive an expression for it. 7
B A, B, C and D are four masses carried by a rotating shaft at radii 100, 125, 200
and 150 mm respectively. The planes in which the masses revolve are spaced 600
mm apart and the mass of B, C and D are 10 kg, 5 kg, and 4 kg respectively. Find
the required mass A and the relative angular settings of the four masses so that
the shaft shall be in complete balance.
7
OR
Q-4 A Explain an analytical method of balancing of several masses rotating in
different planes.
7
B Derive an expression for torsionally equivalent shaft system 7
Q-5 A Explain the method to determine the critical speed of shaft carrying single rotor,
considering damping.
7
B Explain with neat sketch why reciprocating masses are partially balanced? 7
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Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?VI (OLD) EXAMINATION ? WINTER 2018
Subject Code:161901 Date: 07/12/2018
Subject Name: Dynamics Of Machinery
Time: 02:30 PM TO 05:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
Q-1 A Define Static and Dynamic balancing with suitable example. 7
B Explain Vibration isolation and transmissibility 7
Q-2 A Write down short note on Variation of Tractive Force, Swaying couple and
Hammer Blow.
7
B Explain concept of Direct and Reverse Crank. 7
OR
B Four masses m1, m2, m3 and m4 are 200 kg, 300 kg, 240 kg and 260 kg
respectively. The corresponding radii of rotation are 0.2 m, 0.15 m, 0.25 m and
0.3 m respectively and the angles between successive masses are 45?, 75? and
135?. Find the position and magnitude of the balance mass required, if its radius
of rotation is 0.2 m.
7
Q-3 A Discuss different cases showing the characteristics of the system performance for
a damped free vibration.
7
B Describe Dunkerley?s method to find the natural frequency of a shaft carrying
several loads.
7
OR
Q-3 A Explain Hozer?s method to determine natural frequencies of multi-rotor system. 7
B What are various frequency measuring instruments? Explain any one in detail. 7
Q-4 A Define logarithmic decrement and derive an expression for it. 7
B A, B, C and D are four masses carried by a rotating shaft at radii 100, 125, 200
and 150 mm respectively. The planes in which the masses revolve are spaced 600
mm apart and the mass of B, C and D are 10 kg, 5 kg, and 4 kg respectively. Find
the required mass A and the relative angular settings of the four masses so that
the shaft shall be in complete balance.
7
OR
Q-4 A Explain an analytical method of balancing of several masses rotating in
different planes.
7
B Derive an expression for torsionally equivalent shaft system 7
Q-5 A Explain the method to determine the critical speed of shaft carrying single rotor,
considering damping.
7
B Explain with neat sketch why reciprocating masses are partially balanced? 7
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OR
Q-5 A Define and only write the equation of the following terms;
I) Natural Frequency, II) Logarithmic Decrement, III) Natural Frequency Of
Damped Vibration, IV) Damping Factor, V) Dynamic Magnifier, VI)
Displacement Transmissibility.
7
B A cantilever shaft 50 mm diameter and 300 mm long has a disc of mass 100 kg
at its free end. The Young's modulus for the shaft material is 200 GN/m
2
.
Determine the Frequency of longitudinal and transverse vibrations of the shaft.
7
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This post was last modified on 20 February 2020