Unit 5 Inglés técnico para instalaciones de frio y calor

An accident will be more or less serious depending upon the path followed by the current through the body. Thus (mark the false statement): Seleccione una: a longer path will initially have more resistance and therefore higher currents. a path through vital organs will cause far more serious injuries. The most damaging paths are those going through the thorax or the head. All are correct.

Human body internal resistance basically depends : Seleccione una: On current's path through the body. On skin's resistance. On the individual's sex. None.

In case of electric accident, the following rules are to be followed (please indicate the wrong statement): Seleccione una: No touching the damaged person if they are under voltage. To switch off power supplies as soon as possible. To ask for external specialised assistance, e.g. ambulances,. Always to carry out the first assistance protocol, no matter if we don't know how to make it.

Indicate the wrong statement: An essential advantage of automatic power breakers is: Seleccione una: Good protection against overloads. Operation without being destroyed. Interlocks and signalling circuits are enabled. High operation capacity (around 200 operation cycles per day).

Mark the false statement: Seleccione una: Residual current devices resetting is done manually, through a lever or button mechanism. The residual current device is the protection element that Hill be compulsorily installed in every electric installation. The residual current device features a test button that allows knowing whether the trigger circuit works properly. Residual current devices resetting is done automatically so as to avoid interruption of supply owing to spontaneous triggering.

Mark the false statement about fuses: Seleccione una: In a given application, a fuse can be replaced by a higher rated current one, so getting more efficient protection. When a single fuse gets burnt, the whole set must be replaced. If a fuse gets burnt, it is necessary to replace it by any other featuring the same rated current. None.

Mark the false statement (For overload and overcurrent protection purposes, the relays to be used are...): Seleccione una: Thermal-type. Electromagnetic-type. Overload magnetic-thermal-type. Residual current devices.

Mark the right answer: Seleccione una: An electric accident is the fact of suffering an electric discharge as long as the individual gets sick leave, thus it is called accident. An electric accident is the sheer fact of suffering an electric discharge, no matter if personal or material damage has been done. A direct contact takes place when a person voluntarily touches or gets in contact with an electric conductor, installation, element, machine, socket, lamp... where voltage is directly applied. An indirect contact takes place when a person involuntarily touches or gets in contact with an electric conductor, installation, apparatus, machine, lamp... where voltage is directly being applied.

Please indicate the true statement: Seleccione una: The protective conductor (earthing) mustn't go through any switchingdevice. The protective conductor is blue. A yellow-green fuse is used for protecting the protective earthing conductor. The protective conductor is connected to the residual current device.

Please indicate the wrong statement: Seleccione una: Overcurrent can only be due to short-circuits. Overload is a type of overcurrent, but of moderate magnitude and relatively permanent (time lasting). A short-circuit is a fault or insulation imperfection that results in conductors of different voltage level getting in contact, either directly or through an impedance. None.

REBT standards enforce a maximum earthing resistance of: Seleccione una: 800 O. 20 O. 1600 O. None.

REBT standards establish that, for person-protection purposes, a residual current device sensitivity must be, to the maximum: Seleccione una: Low sensitivity: 300mA leakage current. High sensitivity: 30mA leakage current. Very high sensitivity: 10mA leakage current. All are correct.

The factor with most influence upon the effects and damage provoked by electric accidents is: Seleccione una: Applied voltage. Current frequency. Human-body electric resistance. None.

The magnetic-thermal circuit breaker is: Seleccione una: Is an automatic protection device that is frequently utilised instead of a fuse. Is rated in miliamperes (mA). Is the only device adequate for protecting persons in a residential building. None.

The minimum current value causing a sensation in human beings is called Seleccione una: Fibrillation threshold. Perception threshold. None.

The most important preventing measures for avoiding electric accidents are: Seleccione una: Getting apart from active parts. Supplementary protection by jeans of residual current devices. Use of low safety voltage levels. All are correct.

The phenomenon by which muscle control capacity is suppressed, so preventing the individual from getting apart from the contact point is called Seleccione una: Electrization. Ventricular Fibrillation. Muscle Tetanization. None.

The residual current device: Seleccione una: Is a device featuring two triggering elements: a thermal one and an electromagnetic one. Is a device that the neutral and the protective conductors are connected to. Is the traditional protection element for detecting earthing faults and so protecting individuals. the REBT standards require that a residual current device is installed in every domestic electric installation.

Which of the following statements about fuses is true?: Seleccione una: They offer very good protection against short-circuits. They are very safe. They are very cheap, taking into account the service offered. All are true.

Which of the following types of damage cannot be caused by electric currents going through the human body? Seleccione una: Death by ventricular fibrillation. Death by asphyxia. Asphyxia and heart attack. Electric-arc provoked direct burns owing .