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Mechanical Engineering Materials-Free Download

71 :: What is the Device that converts sound energy into mechanical energy? 

Sound energy is mechanical energy. No devices are required to make a conversion. 

72 :: What is a mechanism? 

A mechanism is a system of moving parts that changes an input motion and force into a desired output motion and force. 

73 :: Accelerometers measure acceleration. How do you measure the moment of inertia? 

You calculate it using your moment of inertia equations corresponding to the geometry of the object. There is no simple device I do not think that you can buy to just measure it. 

74 :: Who built the first rocket that Robert Goddard invented? 

Goddard built his own early rockets. 

75 :: What is a slined joint? 

Cotter Pin 

76 :: How pipe flanges are electrically insulated? 

Pipe flanges are protected from corrosion by means of electrolysis, with dielectric flanges. The piping system is electrically insulated by what is called a sacrificial anode. A bag of readily corrodible metal is buried in the ground with a wire running from the pipe to the bag so that the sacrificial anode will corrode first. If any electrical current charges the pipe, it also serves as a ground. 

77 :: Why would some industries select pneumatics over hydraulic? 

Actually, there is need for air reservoir in industrial pneumatics systems. Hydraulics can handle more powerful applications than pneumatics for the same overall dimensions, or can be more compact for the same power. 

78 :: What is a Process Flow Diagram? 

A Process Flow Diagram (or System Flow Diagram) shows the relationships between the major components in the system. It also has basic information concerning the material balance for the process. 

79 :: How do you convert 95 feet into square feet? 

You cannot convert feet into square feet; they are two entirely different and incompatible units. Converting feet to square feet is like converting apples to oranges. 

A linear foot is a unit of distance. A square foot is a unit of area. If you have a rectangular surface, you can compute the area in square feet by multiplying the length in feet by the width in feet. For example, a rectangular patio that is 12 feet wide by 15 feet long has an area of 12 x 15 = 180 square feet. 

80 :: What is difference between mill and mill-drill? 

Today many manufactures are combining machines; a mill/drill is one of these. It is a combination of a drill and a mill, a mill removes stock from material (usually metal, but not limited just to metal, it depends on your application), you use fluted cutters such-as end mills. The drill aspect of the machine is just that it drills holes, with the proper speed for the right size drill. 

81 :: Where pneumatic system is used? 

Any system needs redundancy in work needs pneumatics, because the compressor of the pneumatic system has periodical operations (intermittent work, not as hydraulic pump). The compressed air could be accumulated in tanks with high pressures and used even if the compressor failed. 

82 :: What is brain of the computer? 

The processor (or CPU) is the brain of the computer. This is the part, which does all the "thinking", i.e. maths. 

There is no information stored in the CPU, the information is held in the hard disk, and is fished out, acted on by the CPU, and so on. 

83 :: What is a vee used for on the Vee Block? 

It holds round/cylindrical material. It is usually used to judge the cylindricity of the cylindrical material. 

Normally 90 degrees vee can be used for the marking of the cylindrical cross section surface, level checking. 

84 :: How many litres did 1 cubic meter contains? 

1000 litre in a cubic meter 

85 :: What is the weight of 1m3 of seawater? 

1 m^3 = 1000 lits 

And 1 lit = 1 kg (approx) 

Therefore 1 m^3 = 1000 kg (approx) 

86 :: In 1983 what changed about the length of the meter? 

The French were the first to define the length of a meter by using an alluminium/platinum alloy bar of a meter length at 25 degrees Celsius. This however is very inaccurate for quantum measurements, as the length of the bar would change two much depending on how you hold it. A better measurement found in 1983 is the distance that light travels in a vacuum in 1/229,792,458ths of a second. (For those of us with a decent knowledge of relativity that measurement is taken in the rest frame). Crazy I know but at least this way any body in a good physics lab can reproduce this distance without the use of some silly French rod. 

87 :: What are the advantages of powder metallurgy? 

Power metallurgy is much faster production while holding closer sizes. 

88 :: What are examples of a first class lever? 

Examples of some first class levers are scissor, seesaw, hammer, and wrench. 

89 :: How does a boat measure speed? 

Knots one nautical mile per hour there are 1 1/8 of a nautical mile in a statute mile 

Originally measured by throwing a piece of wood attached to a piece of rope over the back of a boat and counting how many knots went past in a given time. 

These days it is more normally measured by: 

* a) Using a pitot static tube which measure difference in pressure and uses Bernoulli’s equation to find the velocity. 

* b) Some form of propeller (technically impeller) which is suspended under the boat. The passing water turns, the speed of rotation is measured, and this gives you the speed of the boat. 

* c) Using ultrasonic to measure the speed, that small bubbles of air in the water passing under the boat go past. 

90 :: What is a steam turbine diaphragm? 

Steam turbine comprises of stages, number and size of the stages depends upon the break horsepower of the turbine. 

The stage has set of moving and fixed blades. The moving blades are attached to the rotor while the stationary blades are called Diaphragm. 

The diaphragm guides the steam to glide over the moving blades for producing rotary motion. 

91 :: What is wrap-around? 

The main purpose of a wrap-a-round is to make a straight line around a pipe to aid in cutting the pipe to its proper length. It is used mostly as a template or a straight edge. 

92 :: What instrument in a car measures its speed? 

The speedometer and speedometer cable tells the driver how fast the vehicle is going. 

What has called a Hall-Effect sensor is used. It uses the principle of magnetic inductance. When a magnetic flux passes through coils of wire, voltage is generated. To use this effect, a magnet is placed in the cars differential. The sensor then can tell when the magnet comes around by a spike in voltage. Since there is a constant amount the car moves with each differential rotation, and with the time between voltage spikes, you can easily divide to get the speed. 

This is why changing your cars tires will affect your speedometer. Your car assumes that car moves a certain amount with each differential rotation. If you have larger tires on, then each differential rotation (and axle rotation) your car moves further, and you will move faster than indicated. 

93 :: Can an airplane fly without a tail? 

There are a number of aircraft, which are designed without tail assemblies. As for aircraft designed with a tail assembly that may lose it in flight, that's problematic for the flight crew, but there have been instances of portions of tail assemblies being lost due to structural failure or accident that have managed to successfully land. 

94 :: Will going from a 3 tap to a 6 tap increase water pressure? 

No, the pressure will be the same, you will get more volume only if your pumps can handle the gpm, to increase pressure you may need a booster pump or a single pump that is rated for your needs.

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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