GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER- VIII (New) EXAMINATION — WINTER 2019
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Subject Code: 2180214 Date: 25/11/2019Subject Name: Noise, Vibration & Harshness And Safety
Time: 02:30 PM TO 05:00 PM Total Marks: 70
Instructions:
- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
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Q.1 (a) Define: noise, vibration and harshness. 03
(b) Explain plane wave and spherical wave. 04
(c) Explain the anatomy of human ear. 07
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Q.2 (a) Define terms: Rolling, Pitching and Yawing. 03
(b) Differentiate between free vibration and forced vibration. 04
(c) Explain structure borne and air borne sound with respect to vehicle. 07
OR
(c) Explain wave equation. 07
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Q.3 (a) What do you mean by single degree of freedom? 03
(b) Explain effect of road roughness and road irregularities on vehicle vibrations in brief. 04
(c) Explain anechoic chamber. 07
OR
Q.3 (a) What do you mean by accelerometer and vibrometer? 03
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(b) Explain engine air intake and exhaust noise in details. 04(c) Explain passive and active suspension. 07
Q.4 (a) What do you mean by vibration pick up? 03
(b) Explain brake squeal noise. 04
(c) Explain pass by noise test in details. 07
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OR
Q.4 (a) What do you mean by interior noise? 03
(b) Write a short note on microphone. 04
(c) Enlist different types of transducers and explain any one in brief. 07
Q.5 (a) Write a short note on psychological effects of Noise & Vibrations 03
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(b) Explain active safety system in vehicle. 04(c) Explain sources of power train noise in vehicles. 07
OR
Q.5 (a) Write a short note on harshness and its effect. 03
(b) Explain passive safety system in vehicle. 04
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(c) Explain vibration absorber/ isolator. 07--- Content provided by FirstRanker.com ---
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