1. What is the difference between path line and stream line?
A path line is a curve traced by a single fluid particle during its motion. A stream line is an imaginary line drawn in a flow field such that a tangent drawn at any point on this line represents the direction of the velocity vector. There is no flow across the stream line.
2. How can a square section cut in lathe?
A square section can be cut in a lathe by deploying a 4 jaw chuck.
3. What is the ratio of specific heat of air?
It is a ratio of Heat capacity of a gas in a constant pressure process - to heat capacity in a constant volume process.
The Ratio of Specific Heats can be expressed as:
k = cp / cv
Where
k = the ratio of specific heats
4. Explain, why re-heater is used in gas turbine?
The advantage of reheater is significantly increased thrust; the disadvantage is it has very high fuel consumption and inefficiency.
5. What is bearing?
Bearing is a mechanical element that permits relative motion between two parts, such as the shaft and the housing, with minimum friction. The functions of the bearing are as follows:
The bearing ensures free rotation of the shaft or the axle with minimum friction.
The bearing supports the shaft or the axle and holds it in the correct position.
The bearing takes up the forces that act on the shaft or the axle and transmits them to
the frame or the foundation.
6. What is the difference between flat belt and V-belt?
Flat belts have a narrow rectangular cross-section, while V-belts have a trapezoidal cross-section.
Advantages of flat belt over V-belt.
The design of fl at-belt drive is simple and inexpensive.
They can be used for long centre distances, even up to 15 m.
The efficiency of flat belt drive is more than V-belt drive.
Advantages of V-belt over flat belt.
V-belts have short centre distance, which results in compact construction.
The drive is positive because the slip is negligible due to wedge action.
V-belt drive can operate in any position, even when the belt is vertical.
7. Explain the difference between centipoise and centistoke?
Centipoise is the unit of dynamic viscosity. It is equal to 1/100 * poise, and poise = 0.1
Pa.s
Centistoke is the unit of kinematic viscosity and is equal to 1/100 * stoke. Stoke is defined as1 square centimeter per second.
8. State Archimedes principle.
Any weight, floating or immersed in a liquid, is acted upon by a buoyant force equal to the weight of the liquid displaced. This force acts through the center of buoyancy.
9. What do you understand by center of buoyancy?
Center of buoyancy is the center of gravity of the displaced liquid and buoyant force acts through it.
10. How one can establish stability of submerged body and floating body?
A submerged body floats in stable equilibrium when the center of gravity of the body lies directly below the center of buoyancy.
11. What is the difference between uniform and non-uniform flows?
Uniform flow occurs when the magnitude and direction of the velocity do not change from point to point in the fluid.
Non uniform flow occurs when velocity, depth, pressure, etc. change from point to point in the fluid flow.
12. How much resistance is offered to heat flow by drop wise condensation?
Nil
13. Why in some engines glycerin is used in place of water for cooling of engine?
Glycerin has boiling point of 90°C which increases its heat carrying capacity. Thus Weight of coolant gets reduced and smaller radiator can be used.
14. Which parameter remains constant in a throttling process?
Enthalpy
15. What is the difference between isentropic process and throttling process?
In isentropic process, heat transfer takes place and in throttling process, enthalpy before and after the process is same.
16. What is the composition of bronze?
Copper & zinc
17. What is the Composition of stainless steel?
Iron & chromium & nickel & carbon.
18. What is the difference between torque and power?
Power is a measure of how much power an engine produces from burnt fuel while torque is a measure of the turning force that this power has on the wheels of a vehicle. Torque is therefore a product of force and vector.
19. What are knuckle joint and its applications?
Knuckle joint is used to connect two rods whose axes either coincide or intersect and lie in one plane. The knuckle joint is used to transmit axial tensile force.
Its applications are as follows:
Joints between the tie bars in roof trusses.
Joints between the links of a suspension bridge.
Joints in valve mechanism of a reciprocating engine.
20. What are the points that should be kept in mind during forging design?
The forged items such as drop and press forgings should have a parting line that should divide the forging into two equal halves.
The ribs in a forging should not be high or thin.
In order to avoid increased die wear the pockets and recesses in forgings should be minimum
In forgings the parting line of it should lie as far as possible in a single plane.
For ease of forging and easy removal of forgings the surfaces of the metal should contain sufficient drafts.
http://www.mediafire.com/view/q98yragab0tmmn2/6.docx
A path line is a curve traced by a single fluid particle during its motion. A stream line is an imaginary line drawn in a flow field such that a tangent drawn at any point on this line represents the direction of the velocity vector. There is no flow across the stream line.
2. How can a square section cut in lathe?
A square section can be cut in a lathe by deploying a 4 jaw chuck.
3. What is the ratio of specific heat of air?
It is a ratio of Heat capacity of a gas in a constant pressure process - to heat capacity in a constant volume process.
The Ratio of Specific Heats can be expressed as:
k = cp / cv
Where
k = the ratio of specific heats
4. Explain, why re-heater is used in gas turbine?
The advantage of reheater is significantly increased thrust; the disadvantage is it has very high fuel consumption and inefficiency.
5. What is bearing?
Bearing is a mechanical element that permits relative motion between two parts, such as the shaft and the housing, with minimum friction. The functions of the bearing are as follows:
The bearing ensures free rotation of the shaft or the axle with minimum friction.
The bearing supports the shaft or the axle and holds it in the correct position.
The bearing takes up the forces that act on the shaft or the axle and transmits them to
the frame or the foundation.
6. What is the difference between flat belt and V-belt?
Flat belts have a narrow rectangular cross-section, while V-belts have a trapezoidal cross-section.
Advantages of flat belt over V-belt.
The design of fl at-belt drive is simple and inexpensive.
They can be used for long centre distances, even up to 15 m.
The efficiency of flat belt drive is more than V-belt drive.
Advantages of V-belt over flat belt.
V-belts have short centre distance, which results in compact construction.
The drive is positive because the slip is negligible due to wedge action.
V-belt drive can operate in any position, even when the belt is vertical.
7. Explain the difference between centipoise and centistoke?
Centipoise is the unit of dynamic viscosity. It is equal to 1/100 * poise, and poise = 0.1
Pa.s
Centistoke is the unit of kinematic viscosity and is equal to 1/100 * stoke. Stoke is defined as1 square centimeter per second.
8. State Archimedes principle.
Any weight, floating or immersed in a liquid, is acted upon by a buoyant force equal to the weight of the liquid displaced. This force acts through the center of buoyancy.
9. What do you understand by center of buoyancy?
Center of buoyancy is the center of gravity of the displaced liquid and buoyant force acts through it.
10. How one can establish stability of submerged body and floating body?
A submerged body floats in stable equilibrium when the center of gravity of the body lies directly below the center of buoyancy.
11. What is the difference between uniform and non-uniform flows?
Uniform flow occurs when the magnitude and direction of the velocity do not change from point to point in the fluid.
Non uniform flow occurs when velocity, depth, pressure, etc. change from point to point in the fluid flow.
12. How much resistance is offered to heat flow by drop wise condensation?
Nil
13. Why in some engines glycerin is used in place of water for cooling of engine?
Glycerin has boiling point of 90°C which increases its heat carrying capacity. Thus Weight of coolant gets reduced and smaller radiator can be used.
14. Which parameter remains constant in a throttling process?
Enthalpy
15. What is the difference between isentropic process and throttling process?
In isentropic process, heat transfer takes place and in throttling process, enthalpy before and after the process is same.
16. What is the composition of bronze?
Copper & zinc
17. What is the Composition of stainless steel?
Iron & chromium & nickel & carbon.
18. What is the difference between torque and power?
Power is a measure of how much power an engine produces from burnt fuel while torque is a measure of the turning force that this power has on the wheels of a vehicle. Torque is therefore a product of force and vector.
19. What are knuckle joint and its applications?
Knuckle joint is used to connect two rods whose axes either coincide or intersect and lie in one plane. The knuckle joint is used to transmit axial tensile force.
Its applications are as follows:
Joints between the tie bars in roof trusses.
Joints between the links of a suspension bridge.
Joints in valve mechanism of a reciprocating engine.
20. What are the points that should be kept in mind during forging design?
The forged items such as drop and press forgings should have a parting line that should divide the forging into two equal halves.
The ribs in a forging should not be high or thin.
In order to avoid increased die wear the pockets and recesses in forgings should be minimum
In forgings the parting line of it should lie as far as possible in a single plane.
For ease of forging and easy removal of forgings the surfaces of the metal should contain sufficient drafts.
http://www.mediafire.com/view/q98yragab0tmmn2/6.docx
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