Quiz Questions with Correct Answers

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School

Defense Acquisition University *

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Course

EET390

Subject

Mechanical Engineering

Date

Dec 6, 2023

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docx

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Uploaded by charleshaskett

Arc burns are a result of the extremely high temperature caused by an electric arc in close proximity to the body. True The motor nameplate Code letter specifies the locked rotor current rating of the motor in KVA per HP Manual motor starters allow a motor to be controlled from a remote location. False "Dead" circuits should be both b and c checked by metering the voltage locked out and tagged out before starting any repairs Three-wire control circuits use a ___________-contact type of control device. Momentary A relatively small percentage of workplace accidents are associated with arc flash. False Metal hard hats are acceptable when performing electrical work. False As part of the lockout/tagout process, all interlocking or dependent systems must also be deactivated and de-energized. True The pathway taken by electricity through the body has little influence on the severity of an electric shock. False NEMA requires that the motor be able to carry their rated horsepower at nameplate voltage plus or minus 10% Which of the following diagrams shows all physical connections of both internal and external wiring involved in the installation of a piece of electrical equipment? diagram of connections You can reverse the direction of rotation of a 3-phase motor by reversing any two of the three main power leads to the motor. True If a control circuit is supplied from a grounded circuit, it makes no difference what side of the line is grounded. False

The two basic parts of a typical motor circuit are the control circuit and power circuit If the current in the neutral wire is ______ the current in the hot conductor, a ground fault condition exists. less than GFCI protection is not required on temporarily wired construction sites. False OSHA sets safety standards for the workplace and conducts inspection tours to ensure compliance. The nameplate of a motor indicates that it thermal protected. This means the motor has a built in thermal device Broken lines on a diagram are usually used to show mechanical connections. True Which of the following safety solution is most suitable for safeguarding the interior of robotic work cell? safety laser scanner When a split-phase motor is operated with a capacitor in series with one of the stator windings the starting torque is higher Grounding is the intentional connection of a current-carrying conductor to the earth. True You can reverse the direction of rotation of a 3-phase motor by reversing any two of the three main power leads to the motor. True Manual motor starters allow a motor to be controlled from a remote location. False Bonding refers to the connection of all exposed non-current carrying metal parts to the earth. True According to Ohm's law, assuming a body path resistance of 100 ohms, what amount of current would flow if a person came contact with 120-V? 1.2 amperes

Arc burns are a result of the extremely high temperature caused by an electric arc in close proximity to the body. True GFCIs sense leakage currents too small to operate ordinary branch circuit fuses or circuit breakers. True The resistance of earth is not considered as an effective ground-fault current path. True A pressure switch would be classified as a load. False A fuse is never placed on the grounded side of the circuit. True The motor nameplate Code letter specifies the locked rotor current rating of the motor in KVA per HP For a six-lead dual voltage with a low voltage rating of 220 volts, the high voltage rating would be 380 volts Three-phase motors are self-starting on their running windings. True In a dual-voltage split-phase motor, the two run windings are connected in ______ for the HIGH voltage operation. Series The pathway taken by electricity through the body has little influence on the severity of an electric shock. False When replacing a motor, selecting the same _______ ensures that the mounting mechanism and hole positions will match. Frame Size The amount of current flowing through a body is equal to E/R Rubber gloves must be inspected and tested daily or each time they are used. True

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