, 21.02.2023 15:20 amahar4000

# Select all that are true. Group of answer choices major parts of a dc motor are stator, rotor, commutator, and brushes. If the rotor of a dc motor consists of just one conductor loop, the output torque will vary in magnitude from zero to a maximum and back to zero over every half turn of the rotor. Using multiple loops in the rotor of a dc motor not only gives higher torque but also ensures a constant magnitude of the output torque. Using electromagnets in the stator of a dc motor makes higher torque values possible. In a series motor, rotor and stator are connected in series. In a shunt motor, a bypass circuit is provided to prevent overload.

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Engineering, 04.07.2019 18:10
Aloaded platform of total mass 500 kg is supported by a dashpot and by a set of springs of effective stiffness 72 kn/m. it is observed that when the platform is depressed through a distance x = 12.5 cm below its equilibrium position and then released without any initial velocity; it reaches its equilibrium position in the shortest possible time without overshoot. find the position and velocity of the loaded platform 0.10 sec. after its release. if a further load of 400 kg is added to the platform, find, i) the frequency of damped vibrations, and i) the amplitude of vibration after 2 complete oscillations, given that the initial amplitude is 15 cm.