Beginner's Blog

Friday 10 July 2015

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Monday 2 February 2015

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Thursday 8 August 2013

Mechanical Vibration Questions

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1. What is meant by vibrations?

2. Define Force vibration.

3. What is meant by logarithmic decrement?

4. Mention the uses of vibration.

5. What is the critical speed of shaft?

6. Define continuous beam.

7. What is meant by natural vibration?

8. Define Resonance.

9. Mention important types of free vibrations.

10. What is meant by viscous damping?

11. What are three elementary part of a vibrating system?

12. What is common type of damping?

13. Define spring stiffness and damping constant.

14. Why is it important to find the natural frequency of a vibrating system?

15. What are the causes of vibration?

16. Give two examples each of the bad and good effects of vibration

17. Define degree of freedom of a vibrating system

18. What is the difference between deterministic and random vibration?

19. What is the difference between harmonic motion and periodic motion?

20. Define the terms: cycle, amplitude, phase angle, frequency, period and natural frequency.

Wednesday 31 July 2013

GATE 2014 preparation tips Mechanical

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GATE    -Mechanical Engineering & PI

Study Material for GATE

Following    Topics    are    very    important    for    GATE    Examination
Subject    wise    Priority    List
1. Mathematics
2. Manufacturing Science
3. Industrial Engineering
4. SOM
5. TOM
6. Design
7. Thermodynamics
8. Fluid Mechanics
9. Heat Transfer
10. RAC
11. Power plant
12. IC Engine
13. Engineering Materials
14. Engineering Mechanics
Topics

1. Mathematics
a) Probability and Statistics
b) Eigen Values and Eigen Vectors
c) Differential Equations
d) Transform Theory
e) Numerical Methods
f) Calculus, Gradient, Multiple Integrals
g) Complex Variables
h) Matrix Algebra
i) Fourier Series
j) Partial Derivatives
2. Manufacturing    Science
a) Theory of metal cutting, forces, tool life
b) Rolling calculations
c) Wire drawing and Extrusion Calculations
d) Sheet metal operations, clearance, force, power, shear calculations
e) Lathe, drilling, milling, shaping cutting time calculations
f) Grinding and finishing
g) ECM MRR, feed calculations, EDM theory, comparison of all NTMM
h) NC, CNC, Machine, BLU calculations, upto M & G code
i) Limit, tolerance, fit
j) Jig & Fixture, 3-2-1 principle
k) Welding: V-I Characteristics calculations, Resistance welding calculations
l) Casting: allowances, Riser Design, Sprue Design, Pouring time calculations, Special
Castings

3. Industrial    Engineering
a) EOQ Models (VIMP)
b) PERT & CPM (VIMP)
c) Queuing Model (VIMP)
d) Forecasting (VIMP)
e) LPP
f) Work Study & Work Measurement (standard time calculations, theriblings symbol)
g) Break even Analysis
h) The Scheduling Problem and Johnson’s Rule
i) Assembly line balancing

4. SOM
a) Principal Stress and Strain (VIMP)
b) Stress and Strain (VIMP)
c) Bending Moment and Shear Force Diagram (VIMP)
d) Torsion
e) Riveted and Welded Joint
f) Spring
g) Theories of Column (Euler method, end conditions)
h) Strain Energy Method (Castigliano’s theory)
i) Theories of failure
j) Thin and Thick cylinder
5. TOM
a) Mechanism (VIMP)
b) Linear Vibration Analysis of Mechanical Systems (VIMP)
c) Gear train (VIMP)
d) Flywheel (Coefficient of Fluctuation of speed, Coefficient of Fluctuation of energy)
6.    Design
a) Rolling Contact Bearings, Load-life Relationship
b) Sliding contact bearing, Modes of Lubrication, Sommerfeld Number
c) Fluctuating Load Consideration for Design
d) Clutch , Brake

7.    Thermodynamics
a) Basic Concepts
b) Application of First law
c) Entropy, Availability
d) Pure Substance (VIMP)
e) Gases and Gas mixture
f) Thermodynamics relations
8.    Fluid    Mechanics
a) Properties of fluid
b) Pressure measurement, manometers
c) Fluid kinematics (VIMP)
d) Bernoulli’s Equation
e) Venturimeter
f) Boundary Layer, Thermal Boundary Layer
g) Compressible Flow
h) Hydraulic Turbine
i) Centrifugal Pump
9.    Heat    Transfer
a) Conduction
b) Critical Thickness of Insulation
c) Unsteady Conduction (Lumped Parameter Analysis)
d) Heat Exchangers (LMTD, NTU)
e) Radiation (The Stefan-Boltzmann Law, Shape Factor Algebra, Heat Exchange between Non-
black Bodies)
10.    RAC
a) Heat engine, heat pump, refrigerator (VIMP)
b) Vapour Compression Systems
c) Psychrometry (VIMP)
11.    Power    plant
a) Steam Cycle (VIMP)
b) Gas Cycle
c) Compressor
12.    IC    Engine
a) Gas Power Cycles (All) (VIMP)
b) IC Engine Performances
c) Octane number, cetane number

13.    Engineering    materials
a) Iron-carbon Equilibrium diagram, TTT diagram,
b) Heat treatment,
c) Crystal structure & crystal defects

14.    Engineering    Mechanics
a) Equilibrium
b) Truss