1. Consider the following statements with respect to the change in torque angle whenever a disturbance occurs: There is no change in torque angle when the speed of the rotor is the synchronous speed. The angle decreases in case of a motor, if $P_s > P_e$, i.e., the mechanical output is more than the electrical …
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ESE EE Solved Question Paper EE 2026 Prelims Paper – II Network Theorem Capacitor Energy Stored in a Capacitor Nodal Analysis in s-domain First Order System Active and Passive Elements Kirchhoff’s Voltage Law Power Triangle in AC Circuits Analog Electronics Atomic Structure Valance and Conduction Electrons Diode Significance of PN Junction Emission Current of Diode …
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Download Question Paper Download Answer Key 1 A 50 MHz uniform plane wave is propagating in a material with relative permeability and relative permittivity as 2.25 and 1 respectively. The material is assumed to be loss less. Find the phase constant of the wave propagation. (a) π rad/m (b) π/4 rad/m (c) π/2 rad/m (d) …
Download Question Paper 1. V curves for a synchronous motor represent the relation between (a) Armature current and field current (b) Field current and speed (c) Field current and power factor (d) Power factor and speed Answer: (a) Armature current and field current Explanation: The V curves of a synchronous motor show the relationship between …
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In power system protection, relays must be precisely calibrated to distinguish between normal load fluctuations and genuine abnormal conditions like faults or extreme overloads. Two fundamental parameters govern this behavior: Current Setting and Time Setting. Together, they ensure the relay operates accurately and maintains “selectivity” (coordination) with other protective devices. Current Setting The Current Setting, …
An Inverse Definite Minimum Time (IDMT) relay is a widely used protective relay in electrical power systems. It operates on the principle that the operating time of the relay decreases as the magnitude of the fault current increases, but it never becomes less than a fixed minimum time. This characteristic makes the relay very suitable …
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A relay is an electrically operated switching device used in power systems to detect abnormal conditions such as faults and automatically isolate the faulty section to protect equipment and maintain system stability. In power system protection, relays continuously monitor electrical quantities like current, voltage, frequency, or impedance through instrument transformers. When these parameters exceed preset …
Power system protection is the process of detecting abnormal conditions in a power system and isolating the faulty section as quickly as possible while keeping the healthy part in operation. What is a Power System? A power system consists of generation, transmission, and distribution of electrical power. These systems operate at very high voltage levels, …