1. What is Zeroth law of thermodynamics?
Consider three bodies A, B and C. If the bodies A and B are in thermal equilibrium with C when brought into contact separately, they are also in thermal equilibrium with each other. This concept is known as zeroth law of thermodynamics.
2. What is available energy?
Available energy, which under ideal conditions may be completely converted into work.
3. What is Poisson’s ratio?
It is the negative of the ratio between the lateral strains to the longitudinal strains in the elastic region.
4. Define viscosity of a fluid?
Viscosity is the resistance to flow of a fluid material; the thicker the fluid, the greater the viscosity.
5. What do you mean by Proportional limit?
A level of stress above which the relationship between stress and strain is not linear
6. What is viscoelasticity, as a material property?
Viscoelasticity refers to the property most commonly exhibited by polymers that defines the strain of the material as a function of stress and temperature over time. It is a combination of viscosity and elasticity.
7. What is static friction?
The friction experienced by a body when the body is at rest.
8. What is Kinematics?
It is that branch of Theory of Machines which deals with the relative motion between the various parts of the machines
9. What are the materials used for manufacturing belts?
1. Leather belts
2. Cotton or fabric belts
3. Rubber belt
4. Balata belts
10. What is Gyroscope?
Gyroscope is a mechanical system or arrangement having a rotor (usually heavy) spinning at high speed about its axis and being free to turn in any direction.
11. How many degrees of freedom does gyroscope have?
The rotor of gyroscope has three degrees of freedom
1. Spinning about axis XX.
2. Tilting about axis YY.
3. Veering about axis ZZ.
12. What is hunting of the governor?
A governor is said to be hunt if the speed of the engine fluctuates continuously above and below the mean speed.
13. What is the Stability of the governor?
Stability of the governor is the ability to maintain a desired engine speed without fluctuating (i.e. there is not much hunting)
14. What is specific gravity or relative density?
It is defined as the ratio of the density of a substance to the density of some standard substance at a specified temperature (usually water at 4°C, for which density of water = 1000 kg/m3).
SG= density of a substance/ density of water at 4°C
15. What do you mean by Superheat temperature?
The difference between the pouring temperature and the freezing temperature.
16 What is Carburizing process?
It is a process of diffusing carbon element into the surfaces of steel to make the surface hardened.
17. What is sensible energy?
The portion of the internal energy of a system associated with the kinetic energies of the molecules is called the sensible energy
18. What is latent energy?
The internal energy associated with the phase of a system is called the latent energy.
19. What is incompressible substance?
A substance whose specific volume (or density) is constant is called an incompressible substance
20. What is Kinetics?
It is that branch of Theory of Machines which deals with the inertia forces which arise from the combined effect of the mass and motion of the machine parts.
http://www.mediafire.com/view/w1k1fa7jk1s5wsi/10.docx
Consider three bodies A, B and C. If the bodies A and B are in thermal equilibrium with C when brought into contact separately, they are also in thermal equilibrium with each other. This concept is known as zeroth law of thermodynamics.
2. What is available energy?
Available energy, which under ideal conditions may be completely converted into work.
3. What is Poisson’s ratio?
It is the negative of the ratio between the lateral strains to the longitudinal strains in the elastic region.
4. Define viscosity of a fluid?
Viscosity is the resistance to flow of a fluid material; the thicker the fluid, the greater the viscosity.
5. What do you mean by Proportional limit?
A level of stress above which the relationship between stress and strain is not linear
6. What is viscoelasticity, as a material property?
Viscoelasticity refers to the property most commonly exhibited by polymers that defines the strain of the material as a function of stress and temperature over time. It is a combination of viscosity and elasticity.
7. What is static friction?
The friction experienced by a body when the body is at rest.
8. What is Kinematics?
It is that branch of Theory of Machines which deals with the relative motion between the various parts of the machines
9. What are the materials used for manufacturing belts?
1. Leather belts
2. Cotton or fabric belts
3. Rubber belt
4. Balata belts
10. What is Gyroscope?
Gyroscope is a mechanical system or arrangement having a rotor (usually heavy) spinning at high speed about its axis and being free to turn in any direction.
11. How many degrees of freedom does gyroscope have?
The rotor of gyroscope has three degrees of freedom
1. Spinning about axis XX.
2. Tilting about axis YY.
3. Veering about axis ZZ.
12. What is hunting of the governor?
A governor is said to be hunt if the speed of the engine fluctuates continuously above and below the mean speed.
13. What is the Stability of the governor?
Stability of the governor is the ability to maintain a desired engine speed without fluctuating (i.e. there is not much hunting)
14. What is specific gravity or relative density?
It is defined as the ratio of the density of a substance to the density of some standard substance at a specified temperature (usually water at 4°C, for which density of water = 1000 kg/m3).
SG= density of a substance/ density of water at 4°C
15. What do you mean by Superheat temperature?
The difference between the pouring temperature and the freezing temperature.
16 What is Carburizing process?
It is a process of diffusing carbon element into the surfaces of steel to make the surface hardened.
17. What is sensible energy?
The portion of the internal energy of a system associated with the kinetic energies of the molecules is called the sensible energy
18. What is latent energy?
The internal energy associated with the phase of a system is called the latent energy.
19. What is incompressible substance?
A substance whose specific volume (or density) is constant is called an incompressible substance
20. What is Kinetics?
It is that branch of Theory of Machines which deals with the inertia forces which arise from the combined effect of the mass and motion of the machine parts.
http://www.mediafire.com/view/w1k1fa7jk1s5wsi/10.docx
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