Aspiring engineers who are preparing for the Graduate Aptitude Test in Engineering (GATE) understand the significance of thorough preparation and comprehensive study resources.
Through a meticulous examination of previous years’ question papers, we aim to provide you with valuable insights, key trends, and effective strategies to excel in Electrical Machines for your GATE exam.
GATE EE Syllabus for the Subject Electrical Machines
Single phase transformer: equivalent circuit, phasor diagram, open circuit and short circuit tests, regulation and efficiency;
Three-phase transformers: connections, vector groups, parallel operation; Auto-transformer, Electromechanical energy conversion principles;
DC machines: separately excited, series and shunt, motoring and generating mode of operation and their characteristics, speed control of dc motors;
Three-phase induction machines: principle of operation, types, performance, torque-speed characteristics, no-load and blocked-rotor tests, equivalent circuit, starting and speed control; Operating principle of single-phase induction motors;
Synchronous machines: cylindrical and salient pole machines, performance and characteristics, regulation and parallel operation of generators, starting of synchronous motors;
Types of losses and efficiency calculations of electric machines
Analysis of Previous GATE Papers for Electrical Machines
| Year | Percentage of Marks |
|---|---|
| 2023 | 11% |
| 2022 | 12 % |
| 2021 | 8 % |
| 2020 | 10 % |
| 2019 | 13 % |
| 2018 | 8 % |
| 2017 | 13% |
| 2016 | 10% |
| 2015 | 14.50 % |
| 2014 | 12.33 % |
| 2013 | 5 % |
Recent GATE Paper Questions of Electrical Machines
The following questions have been asked from Electrical Machines, in GATE-EE 2023 Paper.
Q. A 10 pole , 50 Hz , 240 V single phase induction motor runs at 540 RPM while driving rated load. The frequency of induced rotor currents due to backward field is [2M]
| A) 100 Hz | B) 95 Hz | C) 10 Hz | D) 5 Hz |
Q. A 3-Phase, star-connected balanced load is supplied from a 3-phase, 400 V balanced voltage source with phase sequence R-Y-B If the wattmeter reading is -400 W and the line current is IR= 2A then the power factor of the load per phase is [1M]
A) Unity
B) 0.5 leading
C) 0.866 leading
D) 0.707 lagging
Q. A three-phase synchronous motor with synchronous impedance 0.1+0.3j per unit per phase has a static stability limit of 2.5
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