OSHA Elec practice test 15

1. An operator is using an overhead crane that enters the cell line working zone. Regarding the conductive surfaces of the crane, which condition must be met if it contacts an energized electrolytic cell?

1. The entire crane must be grounded to the facility ground
2. The portion of the crane that contacts the energized cell must be insulated from ground
3. The crane must be equipped with a GFCI on its power supply
4. The crane must be bonded to the cell line circuit side of the power supply

2. An electrician is preparing to work on a fixed circuit that has been deenergized. Which of the following devices is prohibited from being used as the sole means for deenergizing the circuit?

1. A main disconnect switch
2. A push button or selector switch
3. A circuit breaker
4. A fused disconnect

3. A worker needs to connect two lengths of portable cable over 600 volts in a run. What is the required characteristic of the connectors used for this connection?

1. They shall be of a type that lock firmly together.
2. They may be standard twist-on wire nuts if wrapped in electrical tape.
3. They must be quick-disconnect plugs that can be easily separated while energized.
4. They are permitted to be open-type crimp connectors without locking mechanisms.

4. An industrial worker is evaluating a high-voltage assembly to determine if it meets the definition of a 'Cutout' for over 600 volts. Which component configuration correctly identifies this device?

1. An assembly of a fuse support with either a fuseholder, fuse carrier, or disconnecting blade.
2. A mechanical switching device used solely for isolating a circuit from a source of power without fuses.
3. An enclosure designed for surface mounting with swinging doors secured directly to the walls.
4. A device that governs the electric power delivered to the apparatus in a predetermined manner.

5. A safety manager is defining the scope of a 'Bathroom' for the purpose of applying specific electrical safety rules in a facility. Which combination of fixtures qualifies an area as a bathroom under OSHA definitions?

1. A basin with a toilet, a tub, or a shower.
2. A basin with a toilet and a sink only.
3. A toilet and a shower, even without a basin.
4. Any room with a sink and a mirror.

6. An electrician is installing a disconnecting means for a specific piece of induction heating equipment. What is the minimum ampere rating required for this disconnecting means?

1. It must be at least 125% of the equipment's maximum load current.
2. It must be equal to the nameplate current rating of the equipment.
3. It must be rated for the maximum available fault current at the panel.
4. It must be sized to interrupt the inrush current of the heating elements.

7. A qualified electrician is working in the vicinity of overhead lines and wishes to approach closer than the distance shown in Table S-5. Which of the following conditions permits this closer approach?

1. The electrician wears standard leather work gloves to protect against abrasion.
2. The electrician is insulated from the energized part using gloves rated for the voltage involved.
3. The electrician ensures the overhead lines are de-energized but not grounded.
4. The electrician uses a conductive tool without an insulating handle to ensure better grip.

8. An electrician is installing circuit breakers in a location where employees work nearby. To comply with OSHA requirements regarding employee safety during operation, what must be ensured about the location or shielding of these devices?

1. They must be located or shielded so employees will not be burned or otherwise injured by their operation.
2. They must be installed at least 10 feet away from any walkway to prevent accidental contact.
3. They must be equipped with audible alarms that sound when the breaker trips.
4. They must be locked in the open position whenever the circuit is not in active use.

9. A site supervisor is evaluating a two-wire, single-phase portable generator rated at 4 kW. Under what condition are its receptacles exempt from requiring ground-fault circuit interrupters?

1. When the generator is used exclusively for lighting circuits.
2. When the circuit conductors of the generator are insulated from the generator frame and all other grounded surfaces.
3. When the generator is equipped with a manual reset button on the main panel.
4. When the generator is operated by a qualified electrician wearing PPE.

10. An industrial worker must adjust a motor controller where live parts operate at over 150 volts to ground and are guarded only by location. What safety measure must be provided for the attendant?

1. The attendant must wear a full-body insulating suit.
2. Suitable insulating mats or platforms shall be provided so the attendant cannot readily touch live parts unless standing on them.
3. The controller must be de-energized before any adjustment is made.
4. A second worker must stand by to monitor the attendant's distance from live parts.

11. An electrician is installing a double-throw knife switch in a vertical orientation. To comply with OSHA requirements for this specific configuration, what safety device must be provided?

1. A locking device to ensure the blades remain in the open position when set
2. A permanent sign warning of backfeed voltage on the load side
3. A noncombustible cover for the exposed wall finish
4. A faceplate made of nonconducting material

12. A worker is inspecting a system where a conductor is intentionally connected to earth through a connection of sufficiently low impedance to prevent hazardous voltage buildup. How is this system described?

1. Grounded
2. Grounded, effectively
3. Grounding conductor
4. Guarded

13. An electrician is working on exposed live parts operating at 40 volts to ground. Under what specific condition may the employer allow the electrician to work on these parts without first deenergizing them?

1. If the work is completed within one hour and the area is barricaded.
2. If there will be no increased exposure to electrical burns or to explosion due to electric arcs.
3. If the electrician wears Class 00 rubber insulating gloves and uses insulated tools.
4. If the circuit is protected by a Ground Fault Circuit Interrupter (GFCI) rated at 5 milliamperes.

14. An industrial worker is connecting auxiliary electric equipment, such as a motor or sensor, to an energized electrolytic cell within the cell line working zone. Which wiring method is permitted for this connection?

1. Standard flexible cord with a continuous conductive reinforcing wire
2. Wire or cable in suitable nonmetallic raceways or cable trays
3. Wire or cable in metal raceways without insulating breaks
4. Direct connection to the premises wiring system using standard conduit

15. An electrician is running flexible cords on the ground at a fair where they are accessible to the public. What protective measure is required to prevent electrical hazards and tripping?

1. Cover the cords with approved nonconductive mats
2. Place the cords in audience traffic paths for easy access
3. Leave the cords exposed to ensure they are visible
4. Use cord connectors laid directly on the ground

16. A technician is disconnecting a standard capacitor (not a surge capacitor or component part) from its power source. What automatic safety feature must be present to handle the stored charge after disconnection?

1. An automatic means of draining the stored charge
2. A manual discharge stick attached to the capacitor
3. A lockout/tagout device on the disconnect switch
4. A ground fault circuit interrupter (GFCI) on the supply line

17. An electrician is servicing an elevator with generator field control where the driving machine is located in a remote machinery space. What specific requirement applies to the disconnecting means for the main power supply conductors in this scenario?

1. It must be capable of being locked in the open position.
2. It must be located within sight of the motion and operation controllers.
3. It must be installed in the balustrade away from the moving treadway.
4. It must be operable without opening the enclosure.

18. If the employee who applied a lock or tag is absent from the workplace, under what condition may a qualified person designated by the employer remove the lock or tag?

1. The employer ensures the employee is not available at the workplace and ensures the employee is aware the lock or tag has been removed before resuming work.
2. The qualified person verifies that the circuit is deenergized and notifies the safety manager.
3. The employer obtains written permission from the absent employee via email or phone.
4. The qualified person replaces the lock with a new lock tagged with their own name.

19. An industrial worker is selecting a conductor for a continuous load. To ensure the conductor does not exceed its temperature rating, which definition must the worker apply to determine the maximum current allowed?

1. Ampacity
2. Bonding
3. Certified
4. Askarel

20. An industrial worker is assigned to perform maintenance on an electric installation. According to the definition of a 'Qualified person,' what is the primary requirement for this worker to be authorized for the task?

1. They must have received training in and demonstrated skills and knowledge in the construction and operation of the equipment and the hazards involved.
2. They must be the only person on site who holds a journeyman electrician license from the state.
3. They must have completed a generic safety orientation covering all plant hazards, regardless of specific equipment knowledge.
4. They must be supervised by a supervisor who holds the qualified person designation.

21. An electrician is working in a wet location and must install switches and circuit breakers. What is the required enclosure type for these components?

1. Standard indoor enclosures are sufficient if the area is covered.
2. Weatherproof enclosures are required.
3. Nonmetallic enclosures without airspace are required.
4. Open-faced enclosures to allow for ventilation.

22. When connecting a flexible cord to a device or fitting, what specific safety measure must be provided to protect the internal connections?

1. Strain relief that prevents pull from being directly transmitted to joints or terminal screws.
2. A fuse installed inline to protect against overcurrent during movement.
3. A twist-lock connector that requires a tool to remove.
4. A grounding clip attached to the outer jacket of the cord.

23. An electrician is setting up temporary lighting for a carnival that will last for 60 days. Under what condition is this temporary installation permitted?

1. It is permitted because the duration does not exceed 90 days for such purposes.
2. It is permitted only if the voltage is greater than 600 volts.
3. It is permitted only if the wiring is installed in ducts used for vapor removal.
4. It is permitted only if bare conductors are used for the earth return.

24. When running indoor communications wires and cables near existing electric light or power conductors, what is the minimum separation distance an electrician must maintain unless a special protective method is used?

1. At least 1.83 m (6 ft)
2. At least 150 mm (6 in.)
3. At least 50.8 mm (2 in.)
4. At least 300 mm (12 in.)

25. An electrician is marking equipment approved for a hazardous location. What information must the marking show regarding temperature?

1. The operating temperature or temperature range based on operation in a 40-degree C ambient.
2. The maximum ambient temperature of the facility where it is installed.
3. The ignition temperature of the specific gas to be encountered.
4. The temperature rating of the insulation on the wiring methods.