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Answer :

Admittance relay is directional relay.

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Description : Define admittance and state its unit.

Answer : Admittance is defined as the ability of the circuit to carry (admit) alternating current through it.  OR  It is the reciprocal of impedance Z. i.e Admittance Y = 1/Z.  Unit: Its unit is siemen (S) or mho (Ʊ).

Description : In which of the following transmission lines, the value of the Shunt admittance should be approximated to zero ? (A) A 66 kV 35 km long line (B) A 132 kV 200 km long line (C) A 220 kV 300 km long line (D) A 400 kV 500 km long line

Answer : In which of the following transmission lines, the value of the Shunt admittance should be approximated to zero ? (A) A 66 kV 35 km long line (B) A 132 kV 200 km long line (C) A 220 kV 300 km long line (D) A 400 kV 500 km long line

Description : The diagonal elements of a nodal admittance matrix are strengthened by adding :  (A) Shunt capacitors (C) Generators (B) Shunt inductances (D) Resistive loads

Answer : A

Description : Which of the following is the SI unit for admittance? A) Ohm B) Henry C) Farad D) Siemens

Answer : Which of the following is the SI unit for admittance? A) Ohm B) Henry C) Farad D) Siemens

Description : what is the reciprocal of admittance?

Answer : impedance is the reciprocal of admittance.