1. What is Gear ratio?
It is the ratio of the number of revolutions of the pinion gear to one revolution of the idler gear.
2. What is Annealing?
It is a process of heating a material above the re-crystallization temperature and cooling after a specific time interval. This increases the hardness and strength if the material.
3. What is the difference between Technology and Engineering?
Engineering is application of science. Technology shows various methods of Engineering. A bridge can be made by using beams to bear the load, by an arc or by hanging in a cable; all shows different technology but comes under civil engineering and science applied is laws of force/load distribution.
4. How to Measure Temperature in Wet Bulb Thermometer?
Wet bulb temperature is measured in a wet bulb thermometer by covering the bulb with a wick and wetting it with water. It corresponds to the dew point temperature and relative humidity.
5. What are the Advantages and Disadvantages of using LPG in Car?
Advantages
1. Complete combustion
2. Fuel saving
3. Homogeneous combustion
Disadvantages
1. As complete combustion is occurring, more heat liberated, not advised for long journey, engine will be over heated
2. Installation is difficult
3. Reduce engine life efficiency
6. What is meant by precision?
Precision is defined as the ability of instrument to reproduce a certain set of readings within a given accuracy.
7. What is Curie point?
Curie point is the temperature at which ferromagnetic materials can no longer be
Magnetized by outside forces.
8. What is the percentage of carbon in cast iron?
2.5%.
9. Which element is added in steel to increase resistance to corrosion?
Chromium.
10. Which is the common element between brass and bronze?
Copper.
11. What is boundary layer?
Boundary layer is the fluid layer in the neighborhood of a solid boundary where the effects of fluid friction are predominant.
12. Define terms
1. ABSOLUTE HUMIDITY – The weight of the water vapour which is associated with unit quantity of air.
2. ABSOLUTE MOTION – Motion of a body in relation to some other body which is at rest.
3. ABSOLUTE PRESSURE – Pressure measured from the true zero or point of no pressure.
4. ABSORPTIVITY – Ability of a material to absorb heat.
5. ACCELERATED FLOW – Type of flow that takes place in nozzles. The flow accelerates and pressure reduces.
13. Which is the hardest compound known?
Diamond.
14. How Cavitations can be eliminated by Pump?
Cavitations means bubbles are forming in the liquid.
To avoid Cavitations, we have to increase the Pump size to one or Two Inch.
To increase the pressure of the Suction Head, or• Decrease the Pump Speed.
15. Define stress.
When an external force acts on a body, it undergoes deformation. At the same time the body resists deformation. The magnitude of the resisting force is numerically equal to the applied force. This internal resisting force per unit area is called stress.
Stress = Force/Area
16. Define strain
When a body is subjected to an external force, there is some change of dimension in the body. Numerically the strain is equal to the ratio of change in length to the original length of the body.= P/A unit is N/mm2
Strain = Change in length/Original length
e = δL/L
17. Which elements increase the corrosion resistance of steel?
Chromium and nickel.
18. Which elements increase the corrosion resistance of steel?
Chromium and nickel.
19. Why hollow circular shafts are preferred when compared to solid circular shafts?
• The torque transmitted by the hollow shaft is greater than the solid shaft.
• For same material, length and given torque, the weight of the hollow shaft will be less compared to solid shaft.
20. The Fatigue life of a part can be improved by?
Improving the surface finish by Polishing & providing residual stress by Shot peen.
http://www.mediafire.com/view/8sfx9h2iriw24c4/3.docx
It is the ratio of the number of revolutions of the pinion gear to one revolution of the idler gear.
2. What is Annealing?
It is a process of heating a material above the re-crystallization temperature and cooling after a specific time interval. This increases the hardness and strength if the material.
3. What is the difference between Technology and Engineering?
Engineering is application of science. Technology shows various methods of Engineering. A bridge can be made by using beams to bear the load, by an arc or by hanging in a cable; all shows different technology but comes under civil engineering and science applied is laws of force/load distribution.
4. How to Measure Temperature in Wet Bulb Thermometer?
Wet bulb temperature is measured in a wet bulb thermometer by covering the bulb with a wick and wetting it with water. It corresponds to the dew point temperature and relative humidity.
5. What are the Advantages and Disadvantages of using LPG in Car?
Advantages
1. Complete combustion
2. Fuel saving
3. Homogeneous combustion
Disadvantages
1. As complete combustion is occurring, more heat liberated, not advised for long journey, engine will be over heated
2. Installation is difficult
3. Reduce engine life efficiency
6. What is meant by precision?
Precision is defined as the ability of instrument to reproduce a certain set of readings within a given accuracy.
7. What is Curie point?
Curie point is the temperature at which ferromagnetic materials can no longer be
Magnetized by outside forces.
8. What is the percentage of carbon in cast iron?
2.5%.
9. Which element is added in steel to increase resistance to corrosion?
Chromium.
10. Which is the common element between brass and bronze?
Copper.
11. What is boundary layer?
Boundary layer is the fluid layer in the neighborhood of a solid boundary where the effects of fluid friction are predominant.
12. Define terms
1. ABSOLUTE HUMIDITY – The weight of the water vapour which is associated with unit quantity of air.
2. ABSOLUTE MOTION – Motion of a body in relation to some other body which is at rest.
3. ABSOLUTE PRESSURE – Pressure measured from the true zero or point of no pressure.
4. ABSORPTIVITY – Ability of a material to absorb heat.
5. ACCELERATED FLOW – Type of flow that takes place in nozzles. The flow accelerates and pressure reduces.
13. Which is the hardest compound known?
Diamond.
14. How Cavitations can be eliminated by Pump?
Cavitations means bubbles are forming in the liquid.
To avoid Cavitations, we have to increase the Pump size to one or Two Inch.
To increase the pressure of the Suction Head, or• Decrease the Pump Speed.
15. Define stress.
When an external force acts on a body, it undergoes deformation. At the same time the body resists deformation. The magnitude of the resisting force is numerically equal to the applied force. This internal resisting force per unit area is called stress.
Stress = Force/Area
16. Define strain
When a body is subjected to an external force, there is some change of dimension in the body. Numerically the strain is equal to the ratio of change in length to the original length of the body.= P/A unit is N/mm2
Strain = Change in length/Original length
e = δL/L
17. Which elements increase the corrosion resistance of steel?
Chromium and nickel.
18. Which elements increase the corrosion resistance of steel?
Chromium and nickel.
19. Why hollow circular shafts are preferred when compared to solid circular shafts?
• The torque transmitted by the hollow shaft is greater than the solid shaft.
• For same material, length and given torque, the weight of the hollow shaft will be less compared to solid shaft.
20. The Fatigue life of a part can be improved by?
Improving the surface finish by Polishing & providing residual stress by Shot peen.
http://www.mediafire.com/view/8sfx9h2iriw24c4/3.docx
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