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The crankshaft coverts to and fro motion of piston into rotation motion. It is exposed to high vibrations due to torque variation,cyclic variation of gas and combustion products,unbalanced weight in engine.

microwave repeater is a tower equipped with a receiver and transmitter for picking up, amplifying, and passing on in either direction the signals sent over a microwave network by highly directional microwave beams. Also known as microwave link or microwave relay. The availability of clear Line of Sight is crucial for Microwave links for which the Earth?s curvature has to be allowed.

In engine cylinder the combustion takes place between cylinder head and piston head.

A primary cell is a battery that is designed to be used once and discarded, and not recharged with electricity and reused like a secondary cell. In general, the electrochemical reaction occurring in the cell is not reversible, rendering the cell unrechargeable.

Open circuit means the wires are cut off so there will be no current flow(0 A), but there is voltage.

Closed circuit means the wires are connected so there will be flow of current, but there is no voltage.

Short circuit also refers closed circuit.

The coefficient of air resistance of car is 0.0032 approx.

A heat engine covert heat energy into mechanical energy. Source of heat energy is fuel,steam etc.

The efficiency of different thermal power cycles are different. The combined cycle have an efficiency of 60%.

The cam shaft contains cam which controls the valve timing of the engine. The shaft should be corrosion free, strong,temperature resistant and of less wear and tear.

Conical scanning is a system used in early radar units to improve their accuracy, as well as making it easier to steer the antenna properly to point at a target.

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