Engines have some blow. It is mostly got past the piston ring and into the crank case. To remove these, air is circulated through crank case when the engine is running. This is called crank case ventilation. The crank case ventilation system prevents build up and oil leakage. In addition, it removes blow by gas to prevent the formation of corrosion and sludge (sludge is thick , creamy , black substances that can form in the engine. It clogs oil screens and lines thereby preventing oil circulation)
Electrical Comparators are used as a means of detecting and amplifying small movements of a work contacting elements. An electrical comparator consists essentially of a pick-up head or transducer for converting a displacement into a corresponding change in current and a meter or recorder connected in the circuit to indicate the electrical change, calibrated to show in terms of displacement. Generally, an amplifier is needed to provide the requisite sensitivity and to match the characteristics of different parts of the circuit. Electrical comparators can be classified according to the electrical principle used in the pick-up head. Most of the comparators use either a differential transformer, an inductance bridge, a strain gauge or a capacitor as a means of detecting movement of the gauging element. There are different types of electrical comparators. One kind called an electrolimit gauge is used to check or measure the outside diameter of a roll. The object to be checked is place
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