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The process of converting AC to DC is known as rectification.

An oscillator circuit uses positive feedback.

Gain is a measure of how much an amplifier ‘amplifies’ the input signal.
If we have an input signal of 1 volt and an output signal of 50 volt, the gain of amplifier is 50.
The voltage gain in decibals is equal to 20 times the common logarithm of the ratio of output voltage to input voltage.
Now we have this ratio as 100. so, gain in decibals is:
20 log(100) = 40dB

The transfer of current from one conductor to another without electrical connection is by air gap transmission.

The opposition to current flow through an AC Inductor is called Inductive Reactance and which depends lineally on the supply frequency.

A weir generally used as spillway of a dam is ogee crested weir

Irrigation canals are generally aligned along ridge line.

A gauge box is used for batching of fine and coarse aggregate by volume. The box should not be too shallow. It should be completely filled with aggregates. The top of the materials should be struck off level with a straight edge. The ratio of materials of concrete decides the capacity of the box.
Volume the size of the wooden box used to measure aggregates is 35 cm x 25 cm x 40 cm

Doping of a semiconductor increase its electrical conductivity to a great extend. Therefore, as doping increases, the conductivity of a p-type semiconductor also increases (more acceptor states means more free holes that can permeate the valence band).

The ripple frequency of a half wave rectifier signal is same the input frequency

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