OSHA Elec practice test 11

1. A worker is determining if a specific tank used for refining materials falls under the definition of 'Electrolytic cells.' What is the defining characteristic of this equipment?

1. A tank or vat in which electrochemical reactions are caused by applying energy for the purpose of refining or producing usable materials.
2. A space envelope wherein operation or maintenance is normally performed on or in the vicinity of exposed energized surfaces.
3. An enclosure designed for surface mounting having swinging doors or covers secured directly to the walls.
4. A device that governs the electric power delivered to the apparatus to which it is connected.

2. An electrician is installing a new disconnecting switch for a specific motor in a factory. The switch is located in a panel room where multiple switches are arranged in a row, and the purpose of each switch is not immediately evident from its location or arrangement. What must the electrician ensure regarding the marking of this disconnecting means?

1. It must be legibly marked to indicate its purpose.
2. It must be painted red to distinguish it from other switches.
3. It must be locked in the open position until the motor is tested.
4. It must be labeled with the manufacturer's name and trademark only.

3. An electrician is connecting a power cable to a mobile machine. How must the terminals of the power cable be enclosed?

1. In a non-metallic plastic box
2. In a metallic enclosure on the mobile machine
3. In a standard junction box on the ground
4. In an open-air terminal block

4. An industrial worker is servicing a center pivot irrigation machine. Regarding the disconnecting means for each motor and controller, what is the required feature for safety during maintenance?

1. It must be capable of being locked in the open position
2. It must be located within 15.2 m (50 ft) of the motor
3. It must be protected by a ground-fault circuit interrupter
4. It must be a locking and grounding type receptacle

5. A worker is using a flexible electric cord to connect portable equipment. How must the worker handle the cord when raising or lowering the equipment?

1. The cord may be used for raising or lowering if the equipment is light.
2. The cord may not be used for raising or lowering the equipment.
3. The cord may be used for raising or lowering if it is wrapped around the equipment.
4. The cord may be used for raising or lowering if the plug is disconnected first.

6. When using single-pole portable cable connectors for AC applications, what type of connector is required and what labeling is needed if paralleled sets are used as input devices?

1. They must be listed and of the locking type; paralleled sets must be prominently labeled with a warning indicating the presence of internal parallel connections.
2. They must be listed and of the twist-lock type; paralleled sets require no special labeling if the voltage is under 120V.
3. They must be listed and of the locking type; paralleled sets must be labeled with the ampere rating of the busbar only.
4. They must be listed and of the standard plug type; paralleled sets must be labeled with a warning indicating the presence of internal series connections.

7. An electrician is installing a physical obstruction to prevent workers from contacting live parts in a substation. According to OSHA definitions, what is this obstruction called?

1. A barrier
2. An armored cable
3. An attachment plug
4. A receptacle

8. An electrician is working on the back of an enclosed control assembly where rear access is required to work on de-energized parts. What is the minimum horizontal working space that must be provided?

1. 18 inches (457 mm)
2. 24 inches (610 mm)
3. 30 inches (762 mm)
4. 36 inches (914 mm)

9. A facility manager is reviewing electrical installations to determine which ones must comply with the design safety standards in §§ 1910.302 through 1910.308. Which installation date threshold triggers the requirement for every electrical installation and all utilization equipment to comply with these provisions?

1. Installed or overhauled after March 15, 1972
2. Installed or overhauled after April 16, 1981
3. Installed or overhauled after August 13, 2007
4. Installed or overhauled after January 2, 1990

10. A qualified electrician is working directly on an installation listed in the scope of §§ 1910.331 through 1910.335. Under which condition do these specific work practice provisions NOT apply to this qualified person?

1. When the electrician is working on or directly associated with the installations listed in paragraph (c).
2. When the electrician is working near the installations but not directly associated with them.
3. When the electrician is working on premises wiring in a yard or parking lot.
4. When the electrician is working on installations of conductors that connect to the supply of electricity.

11. An electrician is installing temporary wiring for a construction site. Which of the following is a required practice for branch circuits supplying receptacles or fixed equipment when run as open conductors?

1. Each branch circuit shall contain a separate equipment grounding conductor.
2. The conductors may be laid on the floor if covered by a protective mat.
3. Receptacles for uses other than temporary lighting may share the branch circuit with temporary lighting.
4. Open conductors must be fastened at intervals not exceeding 20 feet.

12. A ground worker needs to contact a vehicle or mechanical equipment that is operating near energized overhead lines. Which condition allows the ground worker to contact the equipment?

1. The vehicle is in transit with its structure lowered
2. The employee is using protective equipment rated for the voltage
3. The vehicle is intentionally grounded at the point of contact
4. The overhead lines are de-energized but not locked out

13. An electrician connects a motor to a branch circuit using a cord and plug. If individual overload protection is omitted, what is the maximum rating allowed for the attachment plug or receptacle at 125 volts?

1. 15 amperes.
2. 20 amperes.
3. 10 amperes.
4. 30 amperes.

14. An electrician is routing a flexible extension cord across a construction floor where it must pass through a doorway. What is required to comply with safety standards for this pinch point?

1. The cord must be taped down with electrical tape at the threshold.
2. The cord must be replaced with a metal-clad cable system.
3. Protection must be provided to avoid damage to the cord.
4. The cord must be disconnected when not in use to prevent tripping hazards.

15. A worker is preparing to terminate a shielded cable in a system over 600 volts. What must be done with the metallic shielding components at the termination point?

1. They shall be grounded.
2. They shall be left unconnected to prevent ground loops.
3. They shall be insulated with heat shrink tubing.
4. They shall be removed entirely from the cable end.

16. An electrician is routing open conductors through a wall partition. To prevent contact with the wall material, what type of material must the tubes or bushings be made of?

1. Combustible, absorbent insulating material
2. Noncombustible, nonabsorbent insulating material
3. Conductive metal tubing
4. Flexible rubber hose

17. An electrician is designing an indoor electrical installation that is accessible to unqualified persons. The installation includes a ventilated dry-type transformer. What design feature is required for the openings in this transformer?

1. The openings shall be designed so that foreign objects inserted through them will be deflected from energized parts.
2. The openings must be sealed completely with non-conductive tape.
3. The openings must be covered with a mesh screen no larger than 1 cm.
4. The openings must be located only on the top of the transformer.

18. An electrician is installing cartridge fuses on a circuit over 150 volts to ground that are accessible to unqualified persons. What additional component is required to allow safe disconnection?

1. A lockout/tagout padlock on the fuse holder.
2. A disconnecting means installed so the fuse can be disconnected without disrupting unrelated circuits.
3. A warning sign posted directly on the fuse block.
4. A current-limiting device on the supply side of the service disconnecting means.

19. A qualified electrician is installing circuit breakers in an area accessible only to qualified employees. Which mounting method is permitted in this specific location?

1. Open mounting
2. Metal-enclosed units
3. Fire-resistant cell-mounted units
4. Plastic-enclosed units

20. An electrician is installing an aerial cable with a metal sheath entering a building where it is exposed to contact with electric light or power conductors. What must be done to the metal sheath?

1. It shall be grounded or interrupted close to the entrance by an insulating joint or equivalent device
2. It must be painted with non-conductive paint to prevent shock
3. It must be wrapped in standard electrical tape for insulation
4. It must be connected directly to the building's water pipe for grounding

21. An electrician is setting up temporary lighting on a construction site. Under which condition is it permissible to suspend the lights by their electric cords?

1. If the cords are rated for hard usage and the lights are low voltage.
2. If the cords and lights are specifically designed for this means of suspension.
3. If the lights are protected by a ground-fault circuit interrupter (GFCI).
4. If the suspension height is less than 10 feet and the area is dry.

22. In a multiphase system where one phase is used as a neutral conductor, what is the required grounding action for that neutral conductor?

1. The neutral conductor shall be grounded.
2. The neutral conductor must be isolated from ground to prevent circulating currents.
3. The neutral conductor should be bonded to the equipment grounding conductor at every outlet.
4. The neutral conductor requires no grounding if the system is ungrounded.

23. An industrial worker is installing a conduit run in a hazardous (classified) location. What is the required method for making the conduit joints?

1. All conduits shall be threaded and made wrench-tight.
2. Conduits may be glued if they are non-metallic.
3. Conduits should be left loose to allow for thermal expansion.
4. Only the first joint needs to be threaded; the rest can be compression fittings.

24. An industrial worker is preparing to inspect and repair equipment that requires complete isolation. If the isolating means are not designed to interrupt the load current, what must be provided?

1. Either an interlock with an approved circuit interrupter or a sign warning against opening them under load
2. A lockout/tagout device applied by the worker before any inspection
3. A second set of fuses to ensure complete de-energization
4. A barrier to prevent contact with nonshielded cables

25. When barricades are used to limit employee access to work areas with uninsulated energized conductors, what restriction applies to the material of the barricades?

1. Conductive barricades may not be used where they might cause an electrical contact hazard.
2. Barricades must always be made of conductive metal to ground static electricity.
3. Barricades must be made of wood regardless of the voltage present.
4. Barricades are optional if safety signs are posted nearby.