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Year 1 Final Exam JATC UPDATED
QUESTIONS AND CORRECT ANSWERS
Which of the following items should be read first on every lesson? - CORRECT ANSWER Introductory Information A competent electrician is one who has ___ , __ , and a positive ___ for his or her trade. - CORRECT ANSWER skill / knowledge / attitude The nucleus of what was to become the IBEW was formed in? in the city of?. - CORRECT ANSWER 1890 / St. Louis The? Act of 1935 is more commonly referred to as the Wagner Act. - CORRECT ANSWER National Labor Relations Worker? on the job is a major reason that job tasks cannot be performed in a timely manner.
- CORRECT ANSWER Absenteeism ? and? are critically important to jobsite safety. a. - CORRECT ANSWER Awareness / common sense What are the three most important things to remember with regards to work safety? I. Work aware. II. Work effectively. III. Work productively. IV. Work safe. V. Work smart. - CORRECT ANSWER I., IV., and V. To find the area of a wire in circular mils, square the diameter expressed in? - CORRECT ANSWER mils
What tightening torque should be used for a hexagonal head screw (not split-bolt) on a 250 kcmil conductor? - CORRECT ANSWER 325 inch-pounds To reduce a fraction, divide the numerator and denominator by the?. - CORRECT ANSWER same number When multiplying two fractions, multiply the numerator of one fraction by the? of the second fraction. This product is placed over the product of the two denominators. - CORRECT ANSWER numerator The term? is used to identify the reference point or angle. - CORRECT ANSWER theta The side next to the reference angle is called the? side. - CORRECT ANSWER Adjacent Since the ratios for sides of triangles are the same, when the angles are the same,? have been developed which show these ratios for every angle encountered in a triangle. - CORRECT ANSWER trigonometric tables The sine of θ is equal to the? divided by the?. - CORRECT ANSWER opposite / hypotenuse The cos θ is equal to the? side divided by the?. - CORRECT ANSWER adjacent / hypotenuse The tan θ is equal to the? side divided by the? side. - CORRECT ANSWER opposite / adjacent What will happen if the time is not taken to properly measure and lay out a job before trying to bend conduit? - CORRECT ANSWER I. Additional labor to re-bend
Note: There are too many variables to rely solely upon the position of the bender handle to determine the angle of bend. Each bender should be checked initially to verify the accuracy of the bender markings and the take-up value. The recommended way to mark a conduit for bending is to place a short pencil or marker marking where the bend will occur. - CORRECT ANSWER False When fabricating a 90°-bend, the distance to the bending mark is equal to? - CORRECT ANSWER The stub-up minus the take-up Calculate the distance to the reference mark for a 12 3/4-inch stub-up length and match it to the conduit size. - CORRECT ANSWER 1/2 " → 7 3/4" 3/4" → 6 3/4" 1" → 4 3/4" 1 1/4" → N/A Choose the value that most closely equals the stub-up length needed for the 1/2-inch EMT in the photo. Keep in mind that if the measurement is being taken to the side of the box, instead of the inside of the connector, it will be necessary to subtract a slight amount (1/16 to1/ inch) to compensate for the ridge at the bottom of the connector. A temporarily inserted conduit has been installed for a measurement. - CORRECT ANSWER Even though it appears that the actual value required is 17 15/16", it is best to shorten the measurement slightly to compensate for the fact that the connector will not allow the end of the conduit to be inserted even with the side of the box. The correct answer is: 17 7/8" A back-to-back 90° bend has been fabricated in 3/4 " EMT to connect a junction box and a disconnect switch. The tops of both enclosures are at the same height. In laying out this bend, it is necessary to determine the distance between the connector on the box and the connector on the switch. The right side of the conduit connector (junction box) will be used to make the measurement. - CORRECT ANSWER False
Note: The mark will be on the left side of the connector at the point where the back of the bend goes into the connector; "back-to-back" measurements are taken to the outside of the bends, not the inside. When making a back-to-back bend, what benchmark on the bender must be aligned with the pencil mark in order to make the second bend using the bender in the reversed direction? - CORRECT ANSWER star What is the most common angle used when making offsets? - CORRECT ANSWER 30 ° The measured rise method for bending an offset should be used when the angle of the bend cannot be predicted or measured accurately. - CORRECT ANSWER True When making an offset, the bender must face in opposite directions for both bends. - CORRECT ANSWER False Note: The bender must face in the same direction for both bends. Which benchmark on the bender is typically used when making offsets? - CORRECT ANSWER the arrow Match the offset multiplier with the correct bend angle for the following angles. - CORRECT ANSWER 1.4 → 45 ° 2 → 30° 2.6 → 22 1/2° 3.86 → 15° 5.76 → 10° 11.4 → 5° The most common center bend angle for a three-bend saddle is?. - CORRECT ANSWER 45 °
his or her decision. The apprentice should respect the Journeyman's experience and should defer to the Journeyman. ? is a keen sense of what to do or say in order to maintain good relations with others or avoid offense. - CORRECT ANSWER tact Two causes of accidents can best be described as?. - CORRECT ANSWER unsafe acts / unsafe conditions Which of the following is an unsafe act that might be found with ladders? - CORRECT ANSWER overreaching from a ladder Which of the following is an unsafe act that might be found with ladders? - CORRECT ANSWER carrying to heavy of a load up the ladder A ladder top should extend at least? above the roof edge of a building when used as access to the roof of a building. - CORRECT ANSWER 36" It is OK to carry at least one tool in your hands when climbing a ladder. - CORRECT ANSWER False Which of the following would not be a factor that determines the severity of an electric shock? I. The amount of current flowing through the body II. The current's path through the body III. The length of time the body remains in the circuit IV. The current's frequency - CORRECT ANSWER All are factors that determine the severity of an electric shock. Burns are the most common shock-related injury. An electrical accident can result in an electrical burn, arc burn, thermal contact burn, or a combination of burns. - CORRECT ANSWER True
? are devices that interrupt the flow of electricity within as little as 1/40 of a second to prevent electrocution. - CORRECT ANSWER Ground-fault circuit interrupters How often do electrocutions occur in the United States? - CORRECT ANSWER 1 per week Occupational Safety & Health Administration (OSHA) places the threshold voltage of electric shock at?. - CORRECT ANSWER 50 V What is the limited approach boundary distance for an exposed fixed circuit part on a 480Y/277-volt distribution panel? - CORRECT ANSWER 3'6" To ensure adequate protection, a(n)? must be calculated on the basis of the amount of current present if a short circuit occurs, the time the arc is allowed to burn, and the distance the worker is from the arc. - CORRECT ANSWER flash hazard analysis Which National Fire Protection Association (NFPA) document covers safe working practices for electrical work? - CORRECT ANSWER NFPA 70E Flame-resistant clothing is designed for the amount of heat that could be present. This heat is expressed in calories per square centimeter of "incident energy." - CORRECT ANSWER True A(n)? GFCI requires the amount of current leaving the source and returning to the source to be within 5 mA of each other. - CORRECT ANSWER Class A What are two recognized means of preventing injury during electrical equipment operations?
- CORRECT ANSWER Grounding Insulation
During the process of terminating aluminum conductors in a mechanical screw-type connector, and after stripping the insulation off the conductor, the installer should? the conductor and apply a(n)? on the exposed aluminum conductor(s). - CORRECT ANSWER wire brush / listed aluminum joint compound Most? are supplied by the manufacturer already filled with joint compound to seal the connector from moisture and other contaminants. - CORRECT ANSWER compression connectors When the prefix? is used, it means multiply the number by 1,000. - CORRECT ANSWER kilo When the prefix milli is used, it means multiply the number by?. - CORRECT ANSWER 0. When converting from a whole number to a prefixed number,? the whole number by the value of the?. - CORRECT ANSWER divide / prefix When converting from one prefixed number to another,? the number by the value of the first prefix and? that value by the value of the prefix to which you are converting. - CORRECT ANSWER multiply / divide Match the following powers of 10 to the correct units. - CORRECT ANSWER 1 × 10^0 → unit 1 × 10^1 → deka 1 × 10^2 → hecto 1 × 10^3 → kilo 1 × 10^6 → mega 1 × 10^-3 → milli The decimal system of numbers is based on the number?. - CORRECT ANSWER ten
The prefix deci means?. - CORRECT ANSWER tenth What effect will metrication have on America's global competitiveness? - CORRECT ANSWER Metrication will have a negative effect. If a person multiplies one side of an equation by five, what must he or she do to the other side of the equation? - CORRECT ANSWER multiply by 5 Solve the following for X. 45X = 120/2 - CORRECT ANSWER (45X)/45 = 120/(2x45) X = 120/ X = 1. What National Electrical Code (NEC) chapter covers the requirements for firestopping? - CORRECT ANSWER 3 A cable assembly that enters a fire resistive wall and exits the opposite side of the wall is considered to be a? penetration. - CORRECT ANSWER through What is the most important consideration when planning a large wire pull? - CORRECT ANSWER The proper personal protective equipment (PPE) and safety requirements for the job. In underground conduit applications, the cable should? - CORRECT ANSWER be listed for wet locations Which statements are true in terms of aluminum conductors? - CORRECT ANSWER They are typically compact stranded. They are lighter than copper conductors.
