GATE Electrical Machines: DC machines: separately excited, series and shunt, motoring and generating mode of operation and their characteristics, speed control of dc motors – Previous Year Questions
17 GATE previous year questions on DC machines: separately excited, series and shunt, motoring and generating mode of operation and their characteristics, speed control of dc motors (Electrical Machines, Electrical Engineering) with answers and explanations, from every paper.
- GATE 2017 EE Q57 – A 220 V DC series motor runs drawing a current of 30 A from the supply. Armature and field circuit resistances are 0.4 and 0.1 , respectively. The…
- GATE 2017 EE Q59 – A separately excited DC generator supplies 150 A to a 145 V DC grid. The generator is running at 800 RPM. The armature resistance of the generator is…
- GATE 2015 EE Q31 – A separately excited DC generator has an armature resistance of 0.1\ and negligible armature inductance. At rated field current and rated rotor speed,…
- GATE 2015 EE Q58 – A separately excited DC motor runs at 1000 rpm on no load when its armature terminals are connected to a 200 V DC source and the rated voltage is…
- GATE 2015 EE Q59 – A DC motor has the following specifications: 10 hp, 37.5 A, 230 V; flux/pole = 0.01 Wb, number of poles = 4, number of conductors = 666, number of…
- GATE 2016 EE Q34 – A 4-pole, lap-connected, separately excited dc motor is drawing a steady current of 40 A while running at 600 rpm. A good approximation for the…
- GATE 2016 EE Q57 – A DC shunt generator delivers 45 A at a terminal voltage of 220 V. The armature and the shunt field resistances are 0.01 and 44 respectively. The…
- GATE 2018 EE Q34 – A separately excited dc motor has an armature resistance R a=0.05\ . The field excitation is kept constant. At an armature voltage of 100 V, the motor…
- GATE 2018 EE Q62 – A 200 V DC series motor, when operating from rated voltage while driving a certain load, draws 10 A current and runs at 1000 r.p.m. The total series…
- GATE 2019 EE Q56 – A 220 V DC shunt motor takes 3 A at no-load. It draws 25 A when running at full-load at 1500 rpm. The armature and shunt resistances are 0.5\ and 220\…
- GATE 2020 EE Q38 – A 250 V dc shunt motor has an armature resistance of 0.2\ and a field resistance of 100\ . When the motor is operated on no-load at rated voltage, it…
- GATE 2021 EE Q54 – A belt-driven DC shunt generator running at 300 RPM delivers 100 kW to a 200 V DC grid. It continues to run as a motor when the belt breaks, taking 10…
- GATE 2022 EE Q62 – A 280 V, separately excited DC motor with armature resistance of 1\ and constant field excitation drives a load. The load torque is proportional to…
- GATE 2023 EE Q30 – A separately excited DC motor rated 400 V, 15 A, 1500 RPM drives a constant torque load at rated speed operating from 400 V DC supply drawing rated…
- GATE 2024 EE Q55 – A 5 kW, 220 V DC shunt motor has 0.5 Ω armature resistance including brushes. The motor draws a no-load current of 3 A. The field current is constant…
- GATE 2025 EE Q26 – The operating region of the developed torque (T em) and speed () of an induction motor drive is given by the shaded region OQRE in the figure. The…
- GATE 2025 EE Q44 – A DC series motor with negligible series resistance is running at a certain speed driving a load, where the load torque varies as cube of the speed.…