GTU BE/B.Tech 2018 Winter Question Papers || Gujarat Technological University
Subject Name: Noise, Vibration & Harshness And Safety
Time: 02:30 PM TO 05:00 PM
Date: 19/11/2018
Total Marks: 70
Subject Code: 2180209/2180214
GUJARAT TECHNOLOGICAL UNIVERSITY
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BE - SEMESTER-VIII (NEW) EXAMINATION — WINTER 2018Subject Name: Noise, Vibration & Harshness And Safety
Time: 02:30 PM TO 05:00 PM
Date: 19/11/2018
Total Marks: 70
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Instructions:
- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
| Q.1 | (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 | |
| Q.2 | (a) Define: noise, vibration and harshness. | 03 |
| (b) Give the causes of interior noise of vehicle. | 04 | |
| (c) Explain the anatomy of human ear with neat sketch. | 07 | |
| OR | ||
| (c) Discuss the characteristics and sources of vibration generated in power train. | 07 | |
| Q.3 | (a) What do you mean by accelerometer and vibrometer? | 03 |
| (b) Explain effect of road roughness and road irregularities on vehicle vibrations in brief. | 04 | |
| (c) Enlist different types of transducers and explain any two in brief. | 07 | |
| OR | ||
| (b) Explain working principle of condenser type microphone used in sound measuring device. | 04 | |
| (c) Explain engine air intake and exhaust noise in details. | 07 | |
| Q.4 | (a) Explain pass by noise test in details. | 03 |
| (b) Explain impedance hammer used to measure vibration in brief. | 04 | |
| (c) Explain anechoic chamber in details. | 07 | |
| OR | ||
| (a) Explain sources of noise in vehicles in details. | 03 | |
| Q.5 | (a) What do you mean by single degree of freedom? | 03 |
| (b) Explain any one noise control technique in brief. | 04 | |
| (c) Explain basics of construction and working of sound measuring device. | 07 | |
| OR | ||
| (a) What do you mean by harshness and explain acceptability? | 03 | |
| (b) Give the brief about NVH legislation for vehicles in India. | 04 | |
| (c) Explain psychological effect of noise and vibration on human in details. | 07 | |
| Q.5 | (a) Discuss about noise absorbing material in short. | 03 |
| (b) Differentiate between active safety and passive safety in vehicle. | 04 | |
| (c) Enlist five safety devices used in vehicle and explain construction and working of any two in brief. | 07 |
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