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The two stroke engine has no valve. Port are located at the cylinder walls.

Ignition takes place between piston head and cylinder head.

The output voltage of an unregulated power supply is not regulated .The output voltage will decrease as the output current increases, and vice versa;

Zener diode is commonly used as a voltage regulator to maintain a constant DC output voltage.
A voltage regulator is a part of the power source that maintains a consistent voltage under all operating conditions.
It maintains voltage throughout power fluctuations and load changes.
It can control both AC and DC voltages.

An electronic oscillator is an electronic circuit that produces a periodic, oscillating electronic signal, often a sine wave or a square wave. Oscillators convert direct current (DC) from a power supply to an alternating current (AC) signal.

A light activated silicon controlled rectifier (LASCR) is a silicon controlled rectifier (Thyristor) that conducts when the gate is exposed to light. The gate still operates as a normal gate in a SCR, but is in many cases left disconnected. LASCR is a unidirectional device that conducts current in only direction.

Depletion region or depletion layer is a region in a P-N junction diode where no mobile charge carriers are present. Depletion layer acts like a barrier that opposes the flow of electrons from n-side and holes from p-side.

The process by which, a p-n junction diode blocks the electric current in the presence of applied voltage is called reverse biased p-n junction diode.

A relay is an electromagnetic switch operated by a small electric current . The heart of a relay is an electromagnet (a coil of wire that becomes a temporary magnet when electricity flows through it).

The transmitter combines the information signal to be carried with the radio frequency signal which generates the radio waves, which is called the carrier signal. This process is called modulation.

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