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The sign is determined by the reference.

Wire gauge is a measurement of wire diameter. This determines the amount of electric current a wire can safely carry, as well as its electrical resistance and weight.

Rheostats are variable resistors or adjustable resistors. These are used to divide the voltage or control the current through circuit.

Materials used for making rheostats are high resistivity conducting materials.

Following materials are used for rheostats-

Platinum

Constantan (Constantan is a copper?nickel alloy also known as Eureka, Advance, and Ferry. )

The resistance-change factor per degree Celsius of temperature change is called the temperature coefficient of resistance. This factor is represented by the Greek lower-case letter ?alpha? (a). A positive coefficient for a material means that its resistance increases with an increase in temperature.

The size of flywheel depends on the number of cylinder.

Engine cylinder block is made of grey cast iron with nickel and chromium.

In conventional diesel engines mechanical fuel pumps are used. This pump can generate a pressure between 150 and 250 bar only.

When the gear ratio is 1 : 1 the driving wheel and driven wheel have same speed.

The lubricating oil pump is driven by camshaft.

The failure of leaf spring is due to fatigue.

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