Confined Space Exam Complete Solutions

Confined Space Exam Complete Solutions What is lockout/tagout? - Answers - Isolating and disconnecting utilities and mechanical equipment serving the space, in preparation for entry into the confined space. OSHA allows employers to exempt some confined spaces from complete permit entry programs if the space contains only _______________ hazards which can be controlled by ventilation alone. - Answers - ATMOSPHERIC Confined spaces and permit required confined spaces are the same thing. - Answers - False Rescuers constitute approximately 60% of confined space fatalities. - Answers - True The Entry Supervisor has the responsibility for actually going in and making a rescue in a confined space. - Answers - False The three main positions identified by OSHA for permit required confined space operations are attendant, entrant and perimeter control officer. - Answers - False Air Purifying Respirators (APR) are designed to be used in an oxygen deficient environment. - Answers - False The Entry Supervisor approves and cancels the confined space entry permit. - Answers - True The SCBA cylinder size can have an impact on rescuer mobility within a confined space. - Answers - True When retrieving victims and rescuers from a confined space, powered equipment such as a bumper winch is never used because resistance cannot be felt. - Answers - True On a confined space entry, it is critical that the Entry Supervisor have constant communications with the Entrant. - Answers - False The attendant is responsible for knowing the count and exact names of entrants who have entered the permit required confined space. - Answers - True When the confined space contains a gas which is above its Upper Flammable Limit, be prepared as the gas is imminently going to explode. - Answers - False Of all the engulfment hazards, Steam is the most lethal to rescuers. - Answers - False To facilitate ventilation of a confined space, use any fans available on site or at local appliance stores. - Answers - False An example of a lock-out, tag-out procedure is shutting a switch off at a circuit panel. - Answers - False "Bridging" in confined spaces is a method of using ladders horizontally to get from one confined space to another - Answers - False Atmospheric monitoring in confined spaces is always done in the following order: Oxygen content, Flammable Gasses (LEL) and then potential toxins. - Answers - True Suffocation, poisoning, explosion / fire are all potential effects of hazardous atmospheres in confined spaces. - Answers - True One indicator of a permit required confined space is oxygen levels of 21%. - Answers - False The Entrant is ultimately responsible for approving and cancelling the entry permit. - Answers - False True or False. It should be assumed that every confined space has an unknown, hazardous atmosphere. - Answers - True What is the lowest percentage that when combustible vapors are mixed with air and a source ignition is present, an explosion can occur? - Answers - LOWER EXPLOSIVE LIMIT (LEL) What is the highest percentage that when combustible vapors are mixed with air and a source ignition is present, an explosion can occur? - Answers - UPPER EXPLOSIVE LIMIT (UEL) Most combustible instruments display gas concentrations in percent of the _______. - Answers - LEL What type of gas monitor: 1. Measures atmospheric concentrations of oxygen; 2. Concentrations are generally measured over a range of 0 to 25 percent (%) oxygen in air. 3. Readings are displayed on either an electronic readout or an analog meter. 4. Monitor is calibrated with uncontaminated fresh air containing a minimum of 20.8% oxygen. 5. Some models have an alarm that goes off when oxygen levels drop below 19.5% oxygen. - Answers - Single Gas Monitors for Oxygen Deficiency What type of gas monitors: 1. Use electrochemical cells. 2. Compact, battery-powered devices can be used to measure levels of carbon monoxide (CO) or hydrogen sulfide (H2S), depending on the model. 3. Have audible and visible alarms sound if the gas concentration exceeds a present level. 4. Are well suited for use in confined spaces containing motors or engines, which can generate large quantities of CO, as well as sewers, waste treatment plans, and "sour crude" processing stations which tend to have hazardous volumes of H2S. - Answers - Single Gas Monitors for Toxic Gases What type of gas monitor: 1. Monitors for hydrocarbon vapors. 2. Operates by the catalytic action of a heated platinum filament in contact with combustible gases. 3. When the gas sample contacts the heated filament, combustion on its surface raises the temperature in proportion to the quantity of combustibles in the sample. 4. Wheatstone bridge circuit measures the change in electrical resistance due to the temperature increase. 5. Indicates the percentage of combustible gas present in the sample. - Answers - Single Gas Monitors for Combustible Gases