little b!tch Ricardos final
in accordance with 1910.132 (d)(1) the employer is required to assess the workplace to determine if hazards are present, or are likely to be present, which necessitate the use of personal protective equipment (PPE) which of the following is/are additionally required of the employer if such hazards are present or likely to be present? 1. communicate selection decisions to each affected employee 2. select, and have each affected employee use, the types pf PPE that will protect the affected employee from the hazards identified in the hazard assessment 3. select PPE that properly fits each affected employee 4. store the ppe within or within sight of such workplace
1, 2, 3
many factors should be considered in decisions to create a safe work environment. which of the following considerations should be included in the development and implementation of a safety program, training, and risk assessment procedure? 1. has an attempt been made to reduce the potential worker exposure through work practice or remote switching? 2. has the impedance on the transformer on the supply side of the service changed? 3. has the overcurrent protective device (OCPD) been maintained properly? 4. was the overcurrent protection selected solely to protect the equipment or was worker protection considered as well?
1, 2, 3, 4
which are characteristics of contact with energized components that affect the severity of injury to a person in an electrical shock incident? 1. circuit characteristics, such as voltage 2. Contact resistance and internal resistance of the body 3. duration of the contact 4. environmental conditions that affect the body's contact resistance 5. pathway of the current through the body
1, 2, 3, 4, 5
OSHAs safety and health standards have prevented countless work related injuries, illnesses, and deaths. which of the following does OSHA Indicate are still occurring despite this? 1. Each year more than 3.3 million working men and women suffer a serious Job related injury or illness 2. far too many preventable injuries and fatalities continue to occur 3. millions more are exposed to toxic chemicals that may cause illnesses years from now 4. significant hazards and unsafe conditions still exist in U.S. workplaces 5. none of the above
3 and 4
the occupational safety and health act of 1970 consists of __ sections
35
The two most common conductor terminal temperature ratings associated with circuit breakers and other equipment rated 100 amperes or less are?
60C and 75C
How much power in kilovolt-amperes is delivered to a 3 phase transformer when the line voltage applied is 480 volts and the line current is 12 amps? (round the final answer to two decimal places) 5.6KVA 9.96KVA 17.2KVA 3.3KVA
9.96 kva
twelve 1 AWG THWN copper conductors are installed in a three inch EMT, in an ambient temperature of 101F. All of the conductors are current carrying conductors. Determine the ampacity of the 1 AWG THWN conductors for this application. Calculate to the nearest ampere A. 57 B. 60 C. 114 D. 130
A. 57A
A ___ is a voltage or current at a frequency that is an integer multiple of the fundamental frequency. A. harmonic B. phase C. pulse D. waveform
A. Harmonic
___is a force that acts at a distance and is caused by a magnetic field A. Magnetism B. reluctance C. retention D. waveform distortion
A. Magnetism
A ___ can hold its magnetism for a long period of time. A. Permanent magnet B. Saturated magnet C. semipermanent magnet D. Temporary magnet
A. Permanent magnet
A___ is a controller responsible for providing the initial startup voltage and maintaining a constance current through a lamp. A. ballast B. harmonic filter C. lamp switch D. rectifier
A. ballast
_____ is/are the most prevalent consequences of electrical incidents. these injuries can be due to either electrical shock hazards or arc flash hazards. A. burns B. Falls C. Hearing loss D. sight loss
A. burns
____is magnetism is produced when electricity passes through a conductor A. electromagnetism B. field magnetism C. Magnetic flux D. Magnetomotive force
A. electromagnetism
____ is the property of a device or circuit that causes it to store energy in a magnetic field. A. inductance B. induction C. mutual induction D. Self induction
A. inductance
____power is the power, in watts or kilowatts, used by motors, lights, and other devices to produce useful work A. true B. reactive C. total D. useful
A. true
statistics show the rate of reported serious workplace injuries and illnesses ___. from 11 per 100 workers in 1972 to ____ per 100 workers in 2010. A. dropped/ 3.5 B. dropped/ 10 C. increased 22.5 D. increased/50
A.dropped / 3.5
two 3 phase 4-wire branch circuits supply fluorescent lighting loads. The branch circuits consist of eight 10 AWG THWN copper conductors installed in EMT, in an ambient temperature of 86F determine the ampacity of the 10 AWG conductors in this application. Calculate to the nearest ampere. A. 20 B. 25 C. 30 D. 35
B. 25A
what is the ampacity of each 10 AWG copper conductor with 90c insulation within a three conductor type NM nonmetallic sheathed cable? check 334.80 A. 25 B. 30 C. 35 D. 40
B. 30
A 10 AWG THWN copper conductor is connected to a circuit breaker with termination temperature limitation marked (not to exceed) 60C what is the allowable ampacity of this conductor now that it is connected to this circuit breaker? A. 25 B. 30 C. 35 D. 40
B. 30A
what is the maximum number of 4/0 AWG THHN copper conductors permitted to be installed in a two inch IMC? A. 3 B. 4 C. 5 D. 6
B. 4
using both tables within section 314.16 determine the minimum size standard metal square box needed for an installation in which two 12 AWG THHN copper conductors, two 14 AWG THHN copper conductors and four 10 AWG THHN copper conductors are installed in the same box. A. 4 in x 1^1/4 in B. 4 in x 1^1/2in C. 4in x 2^1/8 in D. 4^11/16in x 1^1/2 in
B. 4 in x 1^1/2 in
in accordance with 1926.416 (a)(1), no employer shall permit an employee to work in such proximity to any part of an electric power circuit that the employee could contact the electric power circuit in the course of work, unless the employee is protected against electric shock by ___ or by guarding it effectively by insulation or other means. A. deenergizing the circuit B. deenergizing the circuit and grounding it C. grounding the circuit D. implementing tagout procedures
B. deenergizing the circuit and grounding it
The neutral conductors of a 4 wire, 3 phase wye circuit, where most of the load is nonlinear and connected to____ are considered to be current carrying conductors according to the provision of table 310.15 (B)(3)(a). A. electric heat B. fluorescent lighting C. incandescent lighting D. electric oven E. option 5
B. fluorscent lighting
the power in a single phase circuit drops to zero? every cycle. A. once B. twice C. four times D. six times
B. twice
subsection 5(b) of the OSHA act requires each ____ to comply with occupational safety and health standards and all rules, regulations, and orders issued pursuant to this act, which are applicable to his or her own actions and conduct. A. competent person B. employee C. employer D. qualified person
B.employee
determine the maximum number of 6 AWG THW copper conductors permitted in 1^ 1/4 inch RMC conduit nipple, 20 inches long, connecting a cabinet and an auxiliary gutter A. 8 B. 10 C. 12 D. 20
C. 12
two 12 AWG conductors pass unbroken through a lighting outlet box. Two 14 AWG conductors enter the box and splice to two 14 AWG conductors leaving the box and two 16 AWG fixture wires that supply a luminaire. Determine the minimum box volume required for this installation. Calculate the box volume toe one decimal place. A. 12.5 in 3 B. 14.0 in 3 C. 16 in 3 D. 18 in 3 E. 20.5 in 3
C. 16.0 in 3
Table 310.15(B)(16) can be used when there are not more than?Single insulated current carrying conductors installed in a raceway ? A.1 B.2 C.3 D.4
C. 3
utilities normally generate?? A. single phase AC power B. singe phase DC power C. 3 phase AC power D. 3 phase DC power
C. 3 phase AC power
Determine the ampacity of three 8 AWG THWN copper conductors installed in EMT, in an ambient temperature of 40c all of the conductors are current carrying conductors. Calculate to the nearest ampere A. 50 B. 48 C. 44 D. 40
C. 44 A
according to the NEC, no conductor larger than___ is permitted to be installed in any standard metal box included in table 314.16 (A) A. 2 AWG B. 4AWG C. 6 AWG D. 8AWG
C. 6 AWG
An EMT raceway contains two 3 phase 480 volt branch circuits. What minimum size THHN branch circuit conductor is required for one of the circuits when it supplies a noncontinous load of 27 kW? Hint: assume all equipment is listed for use at 75C and there are a total of six conductors in the raceway A. 4 B. 6 C. 8 D. 10
C. 8
In which of the following situations would the basic rule of 300.15 require a box or fitting to reinstalled? (note: the term "basic rule" as used here, indicates that exceptions or other conditions do not apply) 1. the point at which a single pole switch is to be installed 2. the point at which a splice in the conductors is to be made . 1 only 2 only both 1 and 2 neither 1 nor 2
C. both 1 and 2
An ___ is an extra electrical connection on a transformer coil that allows a varying number of turns of a coil to be part of the circuit. A. adjustment line B. circuit breaker C. coil tap D. neutral line
C. coil tap
an electrical hazard is defined in NFPA 70E as a dangerous condition such that ____ A. contact can result in electric shock, arc flash, or blast B. contact or equipment failure can result in electric shock, arc flash, or blast C. contact of equipment failure can result in electric shock, arc flash, burn, thermal burn, or arc blast injury D. equipment failure can result in electric shock, arc flash burn, thermal burn, or blast
C. contact of equipment failure can result in electric shock, arc flash, burn, thermal burn, or arc blast injury
The temperature rating associated with the ampacity of a conductor shall be selected and coordinated so as not exceed the___temperature rating of any connected termination, conductor, or device A. average B. highest C. lowest D. standard
C. lowest
in an electric generating power plant, all generators must be connected in ? A. chain B. line C. parallel D. series
C. parallel
what is the maximum number of 6 AWG THW copper conductors permitted in a one inch EMT? A. 2 B. 3 C. 4 D. 5
C.4
determine the minimum size rigid metal conduit needed for an installation consisting of two 3 phase, 480 volt motor circuits installed in the same conduit. One motor circuit consists of 1 AWG THW copper conductors and other is fed with 4 AWG THW copper conductors. A. 1 B. 1 ^1/4 C. 1 ^1/2 D. 2
D. 2 in. RMC
The calculated load for a three phase, 240 vault load is 196 amps. The installation consists of three single insulated conductors in electrical metallic tubing, Type EMT. what size RHW copper conductors are needed? A.2/0 B.3/0 C.4/0 D.250 kcmil
D. 250 kcmil
the code lists the cubic inch (in.3) capacity of a four inch square by 2-1/8 inch deep metal outlet box as? A. 18in 3 B. 21in 3 C. 25.5 in 3 D. 30.3 in 3 E. 42 in 3
D. 30.3 in3
a size 1 AWG TW aluminum conductor must be replaced, What is the minimum size THHN copper conductor (of at least equal ampacity) required to fulfill this replacement? A.1 AWG B.2 AWG C. 3 AWG D. 4 AWG
D. 4 AWG
which of the following boxes would be permitted for the installation of three 10 AWG conductors and three 6 AWG conductors? A. 4 in x 1 1/2 in octagonal box B. 4 in x 1 1/4 in square box C. 4 in x 1 1/2 in square box D. 4^11/16 in x 21/8 in square box
D. 4^11/16 x 2 1/8 in. square box
table 314.16 (a) limits the number of 12 AWG conductors that may be installed in a four inch by 1-1/2 inch square box to? A. 6 B. 7 C. 8 D. 9 E. 11
D. 9
____ is the ratio of a Real power to apparent power in a circuit or distribution system . A. displacement power factor B. distortion power factor C. harmonic power factor D. power factor
D. Power factor
____ power is the power, in volt amperes reactive or kilovolt amperes reactive, (var or KVAr) stored and released by inductors and capacitors. A. apparent B. harmonic C. inductive D. reactive
D. REACTIVE
A___ is an electric device that uses elecrtromagnetism to change voltage from one level to another or to isolate one voltage from another A. condensor B. power distribution panel C. power switchboard D. Transformer
D. Transformer
A material is magnetic if it has? A. disorganized molecular magnets so that the individual fields cancel each other B. molecular magnets that repel each other, resulting in a cyclical spin pattern. C. molecular magnets that shift to form magnetic clusters D. organized molecular magnets so that the individual fields add together
D. organized molecular magnets so that the individual fields add together
___ is the ability of an inductor in a circuit to generate inductive reactance, which opposes change in the circuit. A. impedance B. reaction C. mutual induction D. self induction
D. self induction
A(n) ___ connection is a 3 phase connection that has one end of each coil connected together and the other end of each coil left open for external connections. A. closed B. delta C. open D. wye
D. wye
T/F OCPDS never have a significant role in the level of arc flash hazard
False
T/F. The equipment grounding conductor is considered to be a current carrying conductor according to the provisions of table 310.15 (B)(3)(a)
False
T/F. an arcing fault current has a solid bolted connection between conductors of different phases or between phase conductor and ground or neutral conductor.
False
A utility replaces an existing 300-kVA transformer with a 500-kVA transformer having the same impedance. the available fault current on the secondary of the new transformer will be ___ the available fault current of the transformer being replaced
Higher than
too often a culture exists in the workplace where workers are routinely allowed and expected to work on or near energized electrical circuits. this could be due to which of the following: I. Application of best practices II. Failure to realize how quickly a situation might change and cause an energy release III. ignorance of laws IV. lack of knowledge of the severity of the hazards
II, III, IV
T/F. Arc flash suits and other arc rated clothing used to protect electrical workers from arc flash hazards are typically not rated to protect workers from arc blast hazards
True
T/F. By passing the occupational safety and health act of 1970 congress authorized enforcement of the standards developed under the act
True
T/F. an electrically safe work condition is defined as a state in which an electrical conductor or circuit part has been disconnected from energized parts, locked/tagged in accordance with established standards, tested to ensure the absence of voltage, and grounded if determined necessary
True
T/F. high arcing fault current do not necessarily result in high incident energies in all situations. for instance, if the protecting OCPD is current limiting in its current limiting range for the available acting fault current, the OCPD will reduce the magnitude of the arcing current that actually flows and clear the arcing current in less than 1/2 cycle, resulting in low incident energy levels
True
T/F. while conduit can be used as the ground. installing a separate equipment grounding conductor is always recommended to assure a lower resistive and reliable path to the ground
True
as part of its findings in the congressional findings the purpose section of the OSHA act, the congress found that personal injuries and illnesses arising out of work situations impose ___ upon, and are an ___ interstate commerce in terms of lost production, wage loss, medical expenses, and disability compensation payments
a substantial burden/ hindrance to
in a balanced 3 phase delta, connected system, the line current is equal to____ time the current in one of the coils A. 0.58 B. 1 C. 1.73 D. 2.33
c. 1.73
T/F. Overcurrents are either fault currents or ground fault currents
false
T/F. the extent of injury from electrical shock is typically immediately visible because the current flows on the surface of the skin and not through the internal muscle tissue and organs
false
T/F. A wye-to-delta connection may be made with three single phase transformers
true
T/F. harmonics create problems by causing excess heat in a transformer
true
T/F. it is less likely that workers, contractors, and facilities owners would allow energized work if everyone involved in the decision making process, fully understood the laws, requirements, hazards, true costs, and consequences associated with energized work.
true
T/F. the most efficient way to send electric power over transmission lines is at the lowest current possible
true
T/F..in accordance with 1910.333 (b)(2) while any employee Is exposed to contact with parts of fixed electric equipment or circuits which have been deenergized the circuits energizing the parts shall be locked out or tagged or both in accordance with the requirements of this paragraph.
true
T/F/. transformer taps are usually provided with a total of taps in odd numbers, such as 5 or 7, one each primary coil
true
