A logic circuit has three boolean inputs and one output named A, B, C and S respectively. The boolean input A is connected to an inverter gate, and its result is submitted to an AND gate, along with the input signal B. The AND gate output is then submitted to an OR gate along with the remaining boolean input C. The output of the OR gate is the resulting signal S.

A four poles, three-phase, doubly-feed induction motor has its rotor winding terminals left unconnected. A three-phase symmetrical power source, with 220,0 [V] and 60,0 [Hz], is suddenly connected to the machine stator electrical terminals at standstill, resulting in line currents with 5,0 [A] of magnitude, lagging the stator voltages for almost 90,0 degrees in each phase.

A 4 poles pairs synchronous machine operates as a motor inside an industrial electrical network, with nominal frequency of 50,0 [Hz]. The synchronous machine rotor is equipped with short-circuited bars, creating a squirrel-cage auxiliary winding, dedicated for dumping effects during transients and also to allow the startup of the motor, when the machine is directly connected to the mains power source.

A transformer has a primary winding circuit with 200 turns and a secondary winding circuit with 10 turns. In an ideal, lossless, transformer model, the magnetic core permeability is infinite despite the voltages applied to the windings, the two windings are perfectly coupled and there are no internal resistance in the condutors. In such transformer, when a sinusoidal voltage is applied at the secondary winding with an amplitude of 5,0 [V] RMS, the RMS voltage in the primary winding terminals is equal to 100,0 [V].

In an experiment, two point charges Q1 and Q2 were put on a straight line path, at a certain distance from each other. When both Q1 and Q2 are charged with +2,0 [mC] each, the resulting electric field intensity equals zero in the middle point in the line path between Q1 and Q2. This is true since their electric field vectors in this position have the same magnitude but opposite directions.

Um acionamento eletrônico para motores possui um rendimento de 90,0 [%]. Esse acionamento é responsável por administrar a energia da rede elétrica para a movimentação de um motor que, por sua vez, está ligado a uma carga mecânica que demanda 5,0 [kW] de potência no seu eixo para seu funcionamento. Sabendo que o motor possui um rendimento de 80,0 [%], a potência absorvida da rede elétrica para funcionamento do conjunto carga + motor + acionamento é, aproximadamente:

A respeito das medidas de proteção coletiva citadas na Norma Regulamentadora 10 (NR 10), assinale a alternativa correta.

Um IED, ou Intelligent Electronic Device, consiste em um equipamento digital, microprocessado, capaz de executar tarefas de proteção e automação de um sistema elétrico em tempo real. Esse equipamento foi conectado a um computador pessoal por meio de uma interface padrão EIA RS-232C. Essa interface é

Assinale a alternativa correta a respeito de relés eletromecânicos e relés de estado sólido.

A respeito das manutenções preditiva, preventiva e corretiva, assinale a alternativa correta.