GATE Electrical Machines: Synchronous machines: cylindrical and salient pole machines, performance and characteristics, regulation and parallel operation of generators, starting of synchronous motors – Previous Year Questions
17 GATE previous year questions on Synchronous machines: cylindrical and salient pole machines, performance and characteristics, regulation and parallel operation of generators, starting of synchronous motors (Electrical Machines, Electrical Engineering) with answers and explanations, from every paper.
- GATE 2017 EE Q30 – A three-phase, 50 Hz, star-connected cylindrical-rotor synchronous machine is running as a motor. The machine is operated from a 6.6 kV grid and draws…
- GATE 2017 EE Q56 – Two parallel connected, three-phase, 50 Hz, 11 kV, star-connected synchronous machines A and B, are operating as synchronous condensers. They together…
- GATE 2016 EE Q31 – Consider a system consisting of a synchronous generator working at a lagging power factor, a synchronous motor working at an overexcited condition and…
- GATE 2016 EE Q58 – A three-phase, 50 Hz salient-pole synchronous motor has a per-phase direct-axis reactance (X d) of 0.8 pu and a per-phase quadrature-axis reactance (X…
- GATE 2018 EE Q12 – In a salient pole synchronous motor, the developed reluctance torque attains the maximum value when the load angle in electrical degrees is
- GATE 2019 EE Q21 – A three-phase synchronous motor draws 200 A from the line at unity power factor at rated load. Considering the same line voltage and load, the line…
- GATE 2019 EE Q58 – A 220 V (line), three-phase, Y-connected synchronous motor has a synchronous impedance of (0.25+j2.5)\ /phase. The motor draws the rated current of 10…
- GATE 2020 EE Q17 – A three-phase cylindrical rotor synchronous generator has a synchronous reactance X s and a negligible armature resistance. The magnitude of per phase…
- GATE 2020 EE Q53 – The figure below shows the per-phase Open Circuit Characteristics (measured in V) and Short Circuit Characteristics (measured in A) of a 14 kVA, 400…
- GATE 2021 EE Q18 – Consider the table given: Constructional feature Machine type Mitigation --- --- --- (P) Damper bars (S) Induction motor (X) Hunting (Q) Skewed rotor…
- GATE 2022 EE Q64 – A star-connected 3-phase, 400 V, 50 kVA, 50 Hz synchronous motor has a synchronous reactance of 1 ohm per phase with negligible armature resistance.…
- GATE 2023 EE Q22 – The four stator conductors (A, A′, B and B′) of a rotating machine are carrying DC currents of the same value, the directions of which are shown in…
- GATE 2023 EE Q47 – A three-phase synchronous motor with synchronous impedance of 0.1+j0.3 per unit per phase has a static stability limit of 2.5 per unit. The…
- GATE 2024 EE Q40 – A 3-phase, 11 kV, 10 MVA synchronous generator is connected to an inductive load of power factor (3/2) via a lossless line with a per-phase inductive…
- GATE 2025 EE Q35 – The induced emf in a 3.3 kV, 4 pole, 3-phase star connected synchronous motor is considered to be equal and in phase with the terminal voltage under…
- GATE 2026 EE Q20 – A certain application requires power at a frequency of 16.67 Hz, while the available grid frequency is 50 Hz. A 3-phase synchronous motor connected to…
- GATE 2026 EE Q22 – The figure shows the single-line diagram of a synchronous generator delivering P=50 MW of power at unity power factor to an infinite bus. I s denotes…