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51 :: What was the spinning jenny? 

The spinning jenny is a multi-spool spinning wheel. It was invented circa 1764 by James Hargreaves in Stanhill, near Blackburn, Lancashire in the north west of England (although Thomas Highs is another candidate identified as the inventor). 

52 :: Who invented the four-stroke engine? 

Nikolavs August Otto, German 

53 :: What is meant by payload for aircraft? 

The payload is the cargo that it carries. 

54 :: Who invented springs? 

Rewat 

55 :: How fast is a jet plane? 

Fighter jet aircraft fly at speeds in the low mach numbers. Mach 1 is roughly 750 miles per hour, give or take, and military jets can fly at well over a thousand miles per hour. Back in the day (July of 1976), the SR-71 set the jet speed record. Radar clocked the thing at 2242 mph. Oh, and the record still stands. This highly sensitive aircraft project probably holds back data that would top this figure, but the information will not be coming out soon if it exists. The Blackbird is the answer to your prayers. As a caveat, there is a much faster jet called a scramjet, but it is unmanned. The NASA X-43A can hit Mach 9.6, which is about 7300 miles per hour. 

56 :: What are the uses of windmill? 

Windmills were traditionally used for processing grains, later they started to be used for electricity production as well. Windmills can also be used to pump water. 

57 :: What is isometric drawing? 

It is a 3-D drawing used by draftsmen, architects etc 

58 :: How does iron ore turn into steel? 

To make Steel, Iron Ore is refined into iron and all the carbon is burned away using very high heat (Bessemer). A percentage of Carbon (and other trace elements) are added back to make steel. 

59 :: What is the world is hardest metal? 

Rhenium diboribe 

60 :: What is a machine shop? 

A facility that uses machines to fabricate devices from stock raw materials or to modify mechanisms based upon provided specifications. Also, know as "Back" Shops. 

The common machines in a machine shop are a lathe, a drilling m/c, a miller, a shaper/planer, grinding machine and so on. 

61 :: What are the advantages of gear drive? 

In general, gear drive is useful for power transmission between two shafts, which are near to each other (at most at 1m distance). In addition, it has maximum efficiency while transmitting power. It is durable compare to other such as belts chain drives etc. You can change the power to speed ratio. 

Advantages: -

It is used to get various speeds in different load conditions.

It increases fuel efficiency.

Increases engine efficiency.

Need less power input when operated manually. 

62 :: Why is thick steel wire stronger than thin steel wire? 

The material will yield when stress reaches a critical value.

Stress = Load / Area 

Thick steel wire is stronger than thin steel wire because there is more cross sectional area in the thick wire. Although the material's strength in load per unit area would be the same, the ultimate load that the wire can sustain would be more in the thick wire. 

A simple way of looking at it is to imagine a thick wire as a number of thin wires stuck together. If a thin wire can support a mass of 1kg then 2 thin wires can support 2kg. A wire which is twice as thick (twice the cross sectional area) can also support 2kg. 

63 :: What is the coefficient expansion of transformer oil? 

Transformers can be filled with various types of Refined Mineral Oil. That coefficient is something you would find in specifications of the supplier. 

64 :: What is a clock maker called? 

A watchmaker or clockmaker is called a horologist. 

65 :: What are the types of sensors and their explanation? 

There are many types of sensors. They are used to measure and/or detect a huge variety of conditions including temperature, pressure, level, humidity, speed, motion, distance, light, or the presence/absence of an object and many other types. 

Sensors in some cases react to the environment in which they are placed and this reaction is used to measure the property being sensed. For example, a common temperature detector is known as an RTD (resistance temperature detector) and this contains a platinum wire. The electrical resistance of the wire changes with temperature so how the resistance changes can be used to measure the temperature. 

Many sensors use this type of principle where the variation of an electrical property of a sensing element is a measure of a property being sensed. 

Other types of sensors emit a signal and either measure how the area reacts to the emission or measure the reflection of the signal bouncing off an object in front. Inductive proximity sensors are one of the commonest sensors in use today. They emit a small electromagnetic field and use this to sense the properties of the area in front of the sensor. 

66 :: What is 1810 stainless steel? 

1810 Stainless Steel is the European grade that is equivalent to AISI 304 Stainless Steel. It is the most common stainless steel going. Here is the rundown: 

Fe, <0.08% C, 17.5-20% Cr, 8-11% Ni, <2% Mn, <1% Si, <0.045% P, <0.03% S 

67 :: How is natural gas better than LPG? 

Without getting into the chemistry and physics of the two different types of gases, natural gas has a higher but output than liquid propane gas. In other words, higher the available energy output/more energy is efficient. 

68 :: How can heat be applied to acrylic? 

In most hardware stores, you can find what has called a Heat Gun. Hold the heat gun about 6inches away from the acrylic you intend on bending say the bumper on a car. They are plastic these days, but will melt when you apply heat to them. Using a cold scraper, you can usually mold two pieces back together using the heat gun. 

69 :: Did Elevation affect weight? 

The acceleration of Gravity is less, as you get further away from the center of the earth. This would cause you to weigh less. The equation for the force of gravity is GMm/(R^2). Where G is the universal Gravity Constant which is something like 6.67x10^ (-11) and M is the mass of the earth, and m is the mass of the weight being measured. R is the distance from the center of the earth that increases as you increase in altitude. 

70 :: Which conducts heat faster steel copper or brass? 

Copper conducts heat faster than steel or brass. Any material that is good for conducting heat is also good for electricity in most cases. Wood terrible for transferring heat thus is also insulator for electric.

Source: Contents are provided by Technicalsymposium Google Group Members. 
Disclaimer: All the above contents are provided by technicalsymposium.com Google Group members. 
Further, this content is not intended to be used for commercial purpose. Technicalsymposium.com is not liable/responsible for any copyright issues.

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