Electrical Machines - DC Motor
GATE Electrical Engineering · 4 questions across 3 years (2018-2024) · 8% recurrence rate
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2018–2024Difficulty mix
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All 4 questions on Electrical Machines - DC Motor
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 at 1 A. Assuming that the core and rotational losses are constant and...
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 current. The armature resistance is 1.2 Ω. If the supply voltage drops b...
A 220 V, 10 kW, 900 rpm separately excited DC motor has an armature resistance Rₐ = 0.02 Ω. When the motor operates at rated speed and with rated terminal voltage, the electromagnetic torque developed by the motor is 70...
A 220 V DC series motor runs drawing a current of 30 A from the supply. Armature and field circuit resistances are 0.4 Ω and 0.1 Ω, respectively. The load torque varies as the square of the speed. The flux in the motor m...