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Quiz Session - Attempts With Random Questions

NASCLA Journeyman Electrician Exam Questions

Page 3 of 15

41.

For dwelling units, in addition to other branch circuit requirements, what is the minimum number of 20-amp small appliance circuits?

  • Two

  • One

  • Three

  • Four

Correct answer: Two

Branch circuits and dwelling units are the two main considerations, and small appliance is the third. Two is the minimum number for all homes. 210.52(B) is the next source for additional appliance outlets.

This is a base requirement for all dwellings. More are often installed.

42.

Type BLP communications cable listed for use in plenums is also required to have what two characteristics? 

  • Adequate fire-resistance and low smoke producing

  • Resistant to the spread of fire and prevent carrying fire floor to floor

  • Prevent carrying fire floor to floor and low smoke producing

  • Resistant to the spread of fire and low toxicity

Correct answer: Adequate fire-resistance and low smoke producing

This is a plenum cable under general requirements for communications systems. These qualities are common for use in plenums and duct work.

The other options are other characteristics of ratings not for this particular cable..

43.

Who is OSHA 3071 Job Hazard Analysis designed for?

  • Employers, foremen, and supervisors

  • Management

  • Unqualified persons

  • Construction workers

Correct answer: Employers, foremen, and supervisors

3071 is directed towards employers, foremen, and supervisors. Yet, employees are encouraged to use the information as well to analyze their own jobs and recognize hazards. This is done in a step-by-step, easy to understand way.

44.

When calculating conversions, if a negative impact on safety would result, what conversion shall be used?

  • Soft conversions

  • U.S. customary units

  • Hard conversions

  • Equivalent U.S. customary units

Correct answer: Soft conversions

Safety is the priority of the code. Electrical engineers most often do these calculations. It is the responsibility of the electrician installing all wiring and equipment that all calculations have been done correctly and appropriate considerations made. And it is also an electrician's responsibility to speak up if there is an issue.

45.

How are rooms, sections, or areas to be considered when determining their hazard class?

  • Individually

  • By square footage

  • Collectively

  • At elevations within each

Correct answer: Individually

The scope of each room, section, or area is unique. Evaluations are contingent upon many things, including but not limited to air flow and properties of flammable, combustible, or ignitable vapors, gases, and substances and the likelihood that sufficient concentrations will be present to create a hazard.

Air monitoring systems can allow for shut down in certain circumstances. No two rooms, sections, or areas can be considered the same way.

The other options are parts or aspects of individual or overall site evaluations, but are incorrect for this specific question.

46.

What characteristic do mechanical and architectural scales have in common that is beneficial for use in all plan and blueprint reading?

  • Each has graduation marks at each end of the scale

  • They are flat or triangular

  • They may have mixed engineering and architectural calibrations

  • They may be used in construction drawings

Correct answer: Each has graduation marks at each end of the scale

These graduation marks will be 1/2, 3/8, 1/4, etc. On each scale, there is a different calibration increment for each of the six edges of a triangular scale.

Engineers may have metric designators. Architects have designators that are most common to standard construction increments.

To use, place one of the two points to be measured on the zero line. The other point will most likely fall between two whole numbers. Then slide the scale, bringing the point that was at zero into the fractions until the other point is on a whole number.

Your measurement is the sum of the whole numbers plus the fraction. Because of this, they must be read backwards at times. A little practice and you’ll get the hang of it.

47.

What common device uses pressure to produce electricity?

  • Microphones

  • Photocells

  • Batteries

  • Phone screens

Correct answer: Microphones

When pressure is applied to some materials, the simple force of this pressure is enough to cause the electrons in the valence shell to begin their journey. Microphones operate on this principle. 

Other materials, such as crystals and salts, are used in phonograph records and earphones.

48.

What is the minimum number of branch circuits required for each bathroom and each garage in a two-family dwelling unit? 

  • One

  • Two

  • Three

  • Four

Correct answer: One

Dwelling unit, bathroom, and garage are all considerations, generally in that order. Outlet requirements are also addressed in Part III Required Outlets, Section 210.50 & 52 in greater detail.

A two-family dwelling unit has the same requirements in this question. All considerations are part of the process for determining the number of outlets in homes. Many factors add to these numbers. Those factors may be found referenced in Article 210(C), further on in Article 210, and elsewhere. 

49.

A switch with a marked OFF position is required to completely disconnect which conductor(s) to the load it controls?

  • All ungrounded conductors

  • All circuit conductors

  • The ungrounded conductor

  • All grounding conductors

Correct answer: All ungrounded conductors

First, see this is about off indication. It is also about the disconnecting means, thus, a construction specification concerning switches. Switches are equipment for general use. Off indication is under construction specs because not all switches are made this way.

This OFF indication is only used where the construction of the switch will disconnect all ungrounded conductors.

50.

The manufacturing facility you are constructing has several utility company transformers. Each grounded conductor of these different systems is required to be separately identified and/or marked. There are several parameters for this in the Code.

Where are the means of identification required to be documented, available, and permanently posted?

  • Where the conductors of different systems originate

  • On the supply-side bonding jumper of each different system

  • On the equipment bonding jumper of each different system

  • In the building maintenance office 

Correct answer: Where the conductors of different systems originate

How grounded conductors of different systems are documented is the core of this question, not what the markings are or where they may be. 

Done in this manner, the information is available to qualified persons without the need for additional assistance.  

The other options are the conductor in question (and the locations of where you might find these markings), or a reasonable consideration (maintenance office). But they concern what is addressed and who might address it, not how it is addressed.

51.

Unless prohibited elsewhere in the Code, associated wiring material in a plenum shall be which of the following?

  • Suitable for the ambient temperature

  • Of non-combustable material

  • Fabricated for habitual rooms

  • Suitable for environmental air 

Correct answer: Suitable for the ambient temperature

Equipment is easy to identify here. With air handling, the Code most often articulates this as spaces used for environmental air or plenums. Recognize these as a general requirement for wiring methods and materials.

One example of this type of wiring material is tie-wraps. There are numerous materials that tie-wraps are made from. Some sunlight resistant tie-wraps may give off low-level toxins in the warm environment of a plenum or air duct. Outside, any low toxicity this sunlight resistant material may have is mitigated by the natural environment, but it can be an issue in a plenum. 

The other options are conflated, yet related, terms in this section or synonymous in conversation, but do not satisfy the Code answer. 

52.

What is the effect of counter-EMF?

  • Inductance

  • A magnetic field

  • Impedance of the path

  • Lower impedance of the path

Correct answer: Inductance

The induction of counter-electromotive force induces a current (effect) on an ac circuit. This is due to an alternating magnetic field. This induction results in inductive reactance.

This opposes current in nearby conductors, such as grounds and neutrals. This can either impede the trip time of overcurrent protection devices or cause nuisance trips depending on all other factors in the circuit.

The other options are components of counter-EMF or inductance.

53.

To allow for future increases in electric power and communications circuits, plans and specifications should provide for what?

  • Ample space in raceways, spare raceways, and additional spaces

  • Ample working space for future expansion

  • New products, constructions, or materials

  • Additional ungrounded, grounded, and grounding conductors

Correct answer: Ample space in raceways, spare raceways, and additional spaces

The requirements of Art. 110.26(E) to provide exclusively dedicated equipment space is an example of the intent of 90.8(A) with regards to the future increase in electricity considerations. The practices of the electrical contractor involved should include this. Some electrical contractors are light on this matter. Experienced electrical foremen and journeymen prudently allow for this, installing extra raceways that get used before the job ends.   

54.

What is the type of protection in which electrical parts capable of igniting an explosive atmosphere are fixed in a position and completely surrounded by filling material (glass or quartz power) to prevent the ignition of an external explosive atmosphere known as?

  • Powder filling “q”

  • Type of protection “n”

  • Pressurized enclosure “p”

  • Increased safety “e”

Correct answer: Powder filling “q”

This is the NEC definition. There are numerous “x” suffixes to definitions that are used throughout Article 500.

Recognize the parameters of their definitions: either what they prevent from happening or how they prevent a hazardous situation. This will help you identify when and where you might need them.

The other options are defined separately. If you do not know them, review them.

55.

In accordance with 310.14(B), what are conductor ampacities of flexible cables permitted to be calculated under?

  • Engineering supervision

  • Article 400.5

  • Article 400.2

  • AHJ review

Correct answer: Engineering supervision

Engineering supervision is the key word to identify here, which is not obvious. Learn to see these things in Code questions. It is about flexible cords and cables, and not calculations.

While there are many calculations that electricians must do, there are some we are not qualified to do. Our real job is to check the engineers’ calculations and speak up if we see an issue. We are often more experienced with real-world field conditions than engineers may be. Trust but verify.

The other answers may be applicable provisions, but not the correct answer.

56.

How are ladders and equipment or PPE, such as rubber gloves and FR clothing, that are found to be defective required to be tagged before they are put out of service?

  • Unsafe

  • Broken

  • Damaged

  • Punctured

Correct answer: Unsafe

This tagging is required for all PPE or equipment issued by a company. This ensures that others will not use defective equipment by accident.

The other options are inaccurate. Unsafe is the required articulation.

57.

What theory states that current flow is produced when an electron from one atom knocks electrons of another atom out of orbit?

  • Bump theory

  • Electrical theory

  • Centripetal theory

  • Big Bang theory

Correct answer: Bump theory

When a free electron from one atom strikes a valence electron in the next atom, the energy of the first is transferred to the second. The free electron now stays in the valence shell, sending the struck electron out of orbit. This electron becomes a free electron traveling to the next atom. And the process continues. It is the centripetal force of gravity that keeps electrons in their orbits.

The energy released or transferred when the free electron strikes the valence electron is in the form of heat. This is why electrical cords can be warm and electricity can cause a fire.

58.

The outlets in rooms of the hotel you are wiring are conveniently laid out for furniture arrangement. A sufficient number appear to be readily available. One receptacle in guest rooms appears to be placed so that when an attachment plug is used, it may contact the bed.

What is required to be provided for this receptacle?

  • A suitable guard

  • GFCI protection

  • A tamper-proof outlet

  • A dedicated circuit

Correct answer: A suitable guard

Indicators provided in the question to find this in the Code are a guest room (or suite), convenient furniture layout, readily available, and a plug contacting the bed. The primary issue addressed is receptacle placement. Identifying these items will lead you to the correct answer. All these are part of the 210.60 outline or details of it. Suitable guards are commercially available.

The incorrect options address other issues that arise with outlets but do not satisfy the question.

59.

What must exist for current to flow?

  • A complete path

  • A grounded conductor

  • A grounding conductor

  • An ungrounded conductor

Correct answer: A complete path

This complete path is a complete circuit. It is how electricians must think. In dc applications, the term closed circuit is often used. In dc circuits, a closed loop is formed by the power source, conductors, and load. A flashlight is a good example of this.

The other options are conductors in an ac circuit. They may be a path, but do not satisfy the question.

60.

What are the circuit conductors between the final over-current device protecting the circuit and the outlet(s) referred to as?

  • Branch circuit

  • Feeders

  • The feed

  • Overcurrent protective device, supplementary

Correct answer: Branch circuit

Branch circuits are those between service panels and devices, equipment, or motors and the like. See feeder, for key differences. Circuits coming off of the main switchgear can be considered either a branch circuit or a feeder. The use determines the definition. 

Other options are defined in Article 100 or are common synonyms. These are all terms used in connection with ordinary installations. As said above, the use determines the definition.

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