1. Difference between Performance and Efficiency?
The accomplishment of a given task measured against preset known standards of accuracy, completeness, cost, and speed is called as Performance.
Efficiency is defined as the input given and the work obtained from that input like money, time, labor etc. It’s the main factor of productivity.
2. What is the difference between Speed and Economic Speed?
The rated speed tells us about the maximum speed which can be achieved by a vehicle or some other machine but the economical speed means the speed limit at which the machine works efficiently with least consumption of fuel.eg-in normal bikes (not racing), the max.speed limit shown on speedometer is up to 120 kmph but companies always advice their customers to drive such bikes at around 60 kmph to have maximum mileage.
3. Which has more Efficiency Diesel Engine or Petrol Engine?
Diesel engine has the better efficiency out of two.
4. Difference between 'Thermodynamics and Heat Transfer'?
Thermodynamics mainly deals with the transfer of energy between systems and surroundings in form of either heat or work in equilibrium conditions. When there is change in one state which was in equilibrium state and starting to change in other equilibrium state, this information helps to determine heat or work interactions due to this process.
Heat transfer deals with non equilibrium heat exchange or transfer due to temperature gradient while in thermodynamics; during thermal equilibrium (No temperature gradient) no heat exchange is possible.
5. Difference between Tube and Pipe?
Pipe is always designated by its Inside Diameter (ID) because main purpose of pipe is to carry fluid, while the Tube is always designated by its Outside Diameter (OD). Pipe's thickness is sometimes called as
schedule and tube's thickness is gauge.
As per the tolerance basis, a tube requires higher tolerances as to that of pipe and tubes are more costly in manufacturing compared to pipe production.
6. What is Flywheel Governor?
A flywheel is a heavy rotating body that acts as a reservoir of energy. The energy is stored in the flywheel in the form of kinetic energy. The flywheel acts as n energy bank between the source of power and the driven machinery.
7. What is DTSI Technology?
DTSI stands for Digital Twin Spark Plug Ignition. The vehicles with DTSI Technology use to spark plugs which are controlled by digital circuit. It results in efficient combustion of air fuel mixture.
1. Digital - Since the spark generation will be initiated by a microchip.
2. Twin - Since two spark plugs will be used.
3. Spark ignition - Since the ignition will be done via a spark.
9. What is mean by positive or sagging BM?
BM is said to positive if moment on left side of beam is clockwise or right side of the beam is counter clockwise.
10. What is mean by negative or hogging BM?
BM is said to negative if moment on left side of beam is counterclockwise or right side of the beam is clockwise.
11. State difference between Antifriction Bearing and Journal Bearing?
Journal bearings have higher friction force, consume higher energy and release more heat, but they have larger contact surface, so normally used in low speed high load applications. In anti friction bearings friction is less. One object just rolls over each other.
12. What is the difference between Fan and Blower?
Fan is an air pushing device. Either Axial or Centrifugal type systems are used to move the air in low pressure. It is rotated by a motor separately.
When the fan is a housing of blades and motor, then it called as Blower. It directs the air in a single path with high pressure amount of fuel passing to the engine.
13. Define shear force and bending moment?
SF at any cross section is defined as algebraic sum of all the forces acting either side of beam. BM at any cross section is defined as algebraic sum of the moments of all the forces which are placed either side from that point.
14. What is meant by transverse loading of beam?
If load is acting on the beam which is perpendicular to center line of it is called transverse loading of beam.
15. When will bending moment is maximum?
BM will be maximum when shear force change its sign.
16. What is meant by critical speed?
It is the speed at which the machine vibrates most violently. It is due to many causes, such as imbalance or harmonic vibrations set up by the entire machine. To minimize damage, the turbine should be hurried through the known critical speed as rapidly as possible.
17. What is Cotter joint?
A cotter joint is used to connect rigidly two co-axial rods or bars which are subjected to axial tensile or compressive forces. Here shaft is locked in place by a smaller pin that passes through the side of the lug and partly or completely through the shaft itself. This locking pin is named as cotter.
18. What is the difference between column and strut?
Both column and strut carry compressive load. Column is always vertical but strut as member of structure could carry axial compressive load in any direction.
19. State Hooke's Law?
Hooke's Law defines the stress-strain relationship for an elastic material: σ = Eε, where E = a constant of proportionality called the modulus of elasticity.
20. What is the difference between engineering stress and true stress in a tensile test?
Engineering stress divides the load (force) on the test specimen by the original area; while true stress divides the load by the instantaneous area which decreases as the specimen stretches.
http://www.mediafire.com/view/de8bmjzduj8ookc/7.docx
The accomplishment of a given task measured against preset known standards of accuracy, completeness, cost, and speed is called as Performance.
Efficiency is defined as the input given and the work obtained from that input like money, time, labor etc. It’s the main factor of productivity.
2. What is the difference between Speed and Economic Speed?
The rated speed tells us about the maximum speed which can be achieved by a vehicle or some other machine but the economical speed means the speed limit at which the machine works efficiently with least consumption of fuel.eg-in normal bikes (not racing), the max.speed limit shown on speedometer is up to 120 kmph but companies always advice their customers to drive such bikes at around 60 kmph to have maximum mileage.
3. Which has more Efficiency Diesel Engine or Petrol Engine?
Diesel engine has the better efficiency out of two.
4. Difference between 'Thermodynamics and Heat Transfer'?
Thermodynamics mainly deals with the transfer of energy between systems and surroundings in form of either heat or work in equilibrium conditions. When there is change in one state which was in equilibrium state and starting to change in other equilibrium state, this information helps to determine heat or work interactions due to this process.
Heat transfer deals with non equilibrium heat exchange or transfer due to temperature gradient while in thermodynamics; during thermal equilibrium (No temperature gradient) no heat exchange is possible.
5. Difference between Tube and Pipe?
Pipe is always designated by its Inside Diameter (ID) because main purpose of pipe is to carry fluid, while the Tube is always designated by its Outside Diameter (OD). Pipe's thickness is sometimes called as
schedule and tube's thickness is gauge.
As per the tolerance basis, a tube requires higher tolerances as to that of pipe and tubes are more costly in manufacturing compared to pipe production.
6. What is Flywheel Governor?
A flywheel is a heavy rotating body that acts as a reservoir of energy. The energy is stored in the flywheel in the form of kinetic energy. The flywheel acts as n energy bank between the source of power and the driven machinery.
7. What is DTSI Technology?
DTSI stands for Digital Twin Spark Plug Ignition. The vehicles with DTSI Technology use to spark plugs which are controlled by digital circuit. It results in efficient combustion of air fuel mixture.
1. Digital - Since the spark generation will be initiated by a microchip.
2. Twin - Since two spark plugs will be used.
3. Spark ignition - Since the ignition will be done via a spark.
9. What is mean by positive or sagging BM?
BM is said to positive if moment on left side of beam is clockwise or right side of the beam is counter clockwise.
10. What is mean by negative or hogging BM?
BM is said to negative if moment on left side of beam is counterclockwise or right side of the beam is clockwise.
11. State difference between Antifriction Bearing and Journal Bearing?
Journal bearings have higher friction force, consume higher energy and release more heat, but they have larger contact surface, so normally used in low speed high load applications. In anti friction bearings friction is less. One object just rolls over each other.
12. What is the difference between Fan and Blower?
Fan is an air pushing device. Either Axial or Centrifugal type systems are used to move the air in low pressure. It is rotated by a motor separately.
When the fan is a housing of blades and motor, then it called as Blower. It directs the air in a single path with high pressure amount of fuel passing to the engine.
13. Define shear force and bending moment?
SF at any cross section is defined as algebraic sum of all the forces acting either side of beam. BM at any cross section is defined as algebraic sum of the moments of all the forces which are placed either side from that point.
14. What is meant by transverse loading of beam?
If load is acting on the beam which is perpendicular to center line of it is called transverse loading of beam.
15. When will bending moment is maximum?
BM will be maximum when shear force change its sign.
16. What is meant by critical speed?
It is the speed at which the machine vibrates most violently. It is due to many causes, such as imbalance or harmonic vibrations set up by the entire machine. To minimize damage, the turbine should be hurried through the known critical speed as rapidly as possible.
17. What is Cotter joint?
A cotter joint is used to connect rigidly two co-axial rods or bars which are subjected to axial tensile or compressive forces. Here shaft is locked in place by a smaller pin that passes through the side of the lug and partly or completely through the shaft itself. This locking pin is named as cotter.
18. What is the difference between column and strut?
Both column and strut carry compressive load. Column is always vertical but strut as member of structure could carry axial compressive load in any direction.
19. State Hooke's Law?
Hooke's Law defines the stress-strain relationship for an elastic material: σ = Eε, where E = a constant of proportionality called the modulus of elasticity.
20. What is the difference between engineering stress and true stress in a tensile test?
Engineering stress divides the load (force) on the test specimen by the original area; while true stress divides the load by the instantaneous area which decreases as the specimen stretches.
http://www.mediafire.com/view/de8bmjzduj8ookc/7.docx
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