CSLB C-16 Fire Protection (Trade Exam) — All Questions
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266 questions
A 150-foot trench is 6 feet deep. What is the minimum number of ladders so no worker has more than 25 feet of lateral travel?
- a.6
- b.2
- c.3✓
- d.4
Each ladder covers 50 feet of trench, 25 feet each way, and 150 / 50 = 3. Two ladders would leave gaps with more than 25 feet of travel. Four and six are more than the minimum, though they would also meet the travel limit.Title 8 section 1541
At what depth must an excavation's atmosphere be tested before entry when a hazardous atmosphere is expected?
- a.Greater than 20 feet
- b.Greater than 1 foot
- c.Greater than 4 feet✓
- d.Greater than 10 feet
The atmospheres in the excavation shall be tested before employees enter excavations greater than 4 feet in depth. One foot would require testing in very shallow excavations. Ten and 20 feet are deeper than the trigger, so they would leave 4 to 10 or 20 foot trenches untested.Title 8 section 1541
What oxygen level makes a trench atmosphere oxygen deficient?
- a.Less than 15 percent
- b.Less than 21 percent
- c.Less than 10 percent
- d.Less than 19.5 percent✓
Atmospheres containing less than 19.5 percent oxygen are oxygen deficient under the trench rule. The other levels are not the threshold.Title 8 section 1541
At what flammable gas concentration must ventilation prevent exposure in a trench?
- a.In excess of 100 percent of the lower flammable limit
- b.In excess of 20 percent of the lower flammable limit✓
- c.In excess of 50 percent of the lower flammable limit
- d.In excess of 5 percent of the lower flammable limit
Precautions prevent exposure to a flammable gas in excess of 20 percent of its lower flammable limit. Five percent is lower than the stated threshold. Fifty percent is higher than the threshold. One hundred percent is the explosive limit itself, far above the trigger.Title 8 section 1541
What rescue equipment must be readily available where hazardous atmospheres may develop in an excavation?
- a.A first aid kit kept in the job trailer
- b.A radio kept at the job site office
- c.A fire extinguisher kept near the entrance
- d.Breathing apparatus, harness and line, or stretcher✓
Emergency rescue equipment such as breathing apparatus, a safety harness and line, or a basket stretcher shall be readily available and attended when in use. A first aid kit in the trailer is not rescue equipment and is not at the excavation. A radio in the site office is not equipment for removing a worker. A fire extinguisher near the entrance does not rescue anyone from a hazardous atmosphere.Title 8 section 1541
What does the rule say about working in an excavation with accumulating water?
- a.Not unless adequate precautions are taken✓
- b.Allowed if the water looks clear enough
- c.Allowed if each worker wears a hard hat
- d.Allowed if pumps are on site and idle
Employees shall not work in excavations with accumulated or accumulating water unless adequate precautions are taken, such as special support, water removal monitored by a competent person, or a harness and lifeline. Clear-looking water does not make it safe. A hard hat does not protect against cave-in from water. Idle pumps do not remove water.Title 8 section 1541
How far from the edge must spoil and equipment be kept, or be held back?
- a.At least 10 feet
- b.At least 5 feet
- c.At least 2 feet✓
- d.At least 6 inches
Materials and equipment are kept at least 2 feet from the edge of excavations or held by retaining devices. Six inches is too close to prevent loads falling in. Five feet and 10 feet are farther than the stated minimum.Title 8 section 1541
At what trench depth and width are walkways with guardrails required where crossing over?
- a.Over 3 feet deep and wider than 12 inches
- b.Over 10 feet deep and wider than 60 inches
- c.Over 15 feet deep and wider than 10 feet
- d.Over 6 feet deep and wider than 30 inches✓
Where employees or equipment cross excavations over 6 feet in depth and wider than 30 inches, walkways or bridges with standard guardrails are provided. The other combinations are not the rule.Title 8 section 1541
What defines a permit-required confined space's hazardous atmosphere for oxygen?
- a.Below 15 or above 25 percent
- b.Below 19.5 or above 23.5 percent✓
- c.Below 21 percent in the space
- d.Above 30 percent in the space
The confined-space definition counts oxygen below 19.5 percent or above 23.5 percent as hazardous. The bounds of 15 and 25 percent are wider and would let slightly deficient or enriched air pass. Below 21 percent in the space would call normal air with slightly lower oxygen hazardous. Above 30 percent is far beyond the enrichment limit.Title 8 section 1951
At what flammable concentration is a confined-space atmosphere hazardous?
- a.Over 1 percent of the lower flammable limit
- b.Over 50 percent of the lower flammable limit
- c.At the lower flammable limit itself
- d.Over 10 percent of the lower flammable limit✓
Flammable gas, vapor or mist in excess of 10 percent of its lower flammable limit makes a hazardous atmosphere in the confined-space definition. One percent is below the threshold. Fifty percent is above it. Waiting until the lower flammable limit itself would allow a mixture that is already explosive.Title 8 section 1951
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What are the three characteristics that define a confined space?
- a.Metal-walled, sealed and dark inside throughout
- b.Underground, over ten feet deep and holding water
- c.Smaller than a closet and behind a locked door
- d.Enterable, limited entry or exit, not for occupancy✓
A confined space is one large enough for an employee to bodily enter, with limited or restricted means of entry and exit, and not designed for continuous employee occupancy. Metal-walled, sealed and dark are not the defining traits. Underground, over ten feet deep and holding water describes only some spaces. Smaller than a closet behind a locked door is not part of the definition.Title 8 section 1951
Who identifies confined spaces on a work site?
- a.The worker who is about to enter
- b.The supplier of the materials
- c.The local fire department chief
- d.A competent person, before work begins✓
Before work begins each employer ensures a competent person identifies all confined spaces and each permit space. The worker about to enter is the person exposed to the hazard. The supplier of materials is not assigned the identification duty. The local fire department chief does not classify spaces on a site.Title 8 section 1952
Where does the attendant stay during permit-space entry?
- a.Outside, until relieved by another attendant✓
- b.In the nearest vehicle on the site
- c.Inside, beside the entrant throughout
- d.Wherever the supervisor says on that day
The attendant remains outside the permit space during entry operations until relieved by another attendant. A vehicle on the site is not at the entrance. Staying inside beside the entrant would put the attendant in the hazard. Wherever the supervisor says that day leaves the position undefined.Title 8 section 1958
Which is a control and which is not, for a confined-space hazard?
- a.Ventilation is a control; PPE is not a control✓
- b.Ventilation and PPE are not controls
- c.PPE is a control; ventilation is not
- d.Ventilation and PPE are controls
Control means reducing the hazard by engineering methods such as ventilation, and personal protective equipment is not a control. Saying neither is a control omits ventilation. Saying PPE is a control and ventilation is not reverses the rule. Saying both are controls treats PPE as an engineering method.Title 8 section 1951
What document allows and controls entry into a permit space?
- a.A purchase order
- b.An entry permit✓
- c.A work order
- d.A building permit
The entry permit is the written or printed document that allows and controls entry into a permit space and contains the information in section 1955. A purchase order is a buying record. A work order assigns a task and does not control entry. A building permit allows construction, not entry into a confined space.Title 8 section 1951
Who must be notified if an excavator damages a gas line?
- a.The owner of the building
- b.The facility owner or operator, at once✓
- c.The contractor's own insurer
- d.The owner, after the work has ended
An excavator causing damage to a subsurface installation shall immediately notify the facility owner-operator or contact the regional notification center. The building owner is not the facility owner. The contractor's insurer does not respond to the damage on site. Notifying the owner after the work has ended is not immediate.Title 8 section 1541