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A tank circuit is an electrical circuit consisting of a capacitor connected to an inductor, by conducting wires that use magnetic resonance to store electrical energy oscillating at a certain resonating frequency.
It is used to produce electric oscillations of any desired frequency.
Dynamic impedance is the impedance offered at resonance.
A tank circuit is a parallel LC circuit. So dynamic impedance is infinite as at resonance the circuit become open circuit.
For ideal tank circuit R value is zero. Therefore dynamic impedance is infinite and dynamic admittance is zero.

Thyrite arrester is the commonly used lightning arrester in sub stations.
Such type of arrester is most commonly used for the protection against dangerous high voltage.
It consists the thyrite which is an inorganic compound of ceramic material.

Abrasion test is carried out to test the hardness property of aggregates. The principle of Los Angeles abrasion test is to find the percentage wear due to relative rubbing action between the aggregate and steel balls used as abrasive charge

Broad gauge is also called wide gauge or large line. The distance between the two tracks in these railway gauges is 1676 mm (5 ft 6 in).
Broad Gauge: width 1676 mm to 1524 mm or 5’6? to 5’0?

A standard Cipoletti weir is trapezoidal in shape. The crest and sides of the weir plate are placed far enough from the bottom and sides of the approach channel to produce full contraction. The sides incline outwardly at a slope of 1 horizontal to 4 vertical.

The primary difference between 2G and 3G networks for mobile subscribers is that they get to enjoy faster Internet browsing and data downloading on 3G

In series connection, voltage across the bulb is halved so power becomes one-forth of 60W = 15W.

In parallel connection, the power remains 60W itself.

A saturable reactor is a special form of inductor where magnetic core can be deliberately made saturated by DC current in a control winding. Once saturated inductance drops and more current flows.

The earth wire should not be thinner than 8 SWG for adequate mechanical strength.

Displacement density of a magnetic circuit is charge per unit area. So unit is Coulomb/sq. meter

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