Master Examination Practice Drill #6 2011

Master Examination Practice Drill #6 2011

O Where a hotel has a stationary electric sign installed inside a decorative fountain, the sign shall be at LEAST ______ inside the fountain, when measuring from the outside edges of the fountain.A. 2 feetB. 3 feetC. 4 feetD. 5 feet

O 1. D

O 680.57(C)(1)

O In an aircraft hanger, the area that extends upward from the floor level ________ above the upper surface of aircraft wings, power plants and fuel tanks shall be classified as a Class I, Division 2 or Zone 2 location.A. 5 feetB. 6 feetC. 8 feetD. 10 feet

O 2. A

O 513.3

O Conductors supplying outlets for arc and xenon motion picture projectors of the professional type shall be a MINIMUM size of __________.A. 12 AWGB. 10 AWGC. 8 AWGD. 6 AWG

O 3. C

O 540.13

O Where rigid polyvinyl chloride (PVC) conduit is installed underground to supply a gasoline dispensing unit, threaded rigid metal conduit (RMC) or threaded intermediate metal conduit (IMC) shall be used for the LAST ______ of the underground run to where the conduit emerges.A. 2 feetB. 4 feetC. 5 feetD. 6 feet

O 4. A

O 514.8, Ex. 2

O Where electrical metallic tubing (EMT) is installed under metal-corrugated sheet roofing decking, a clearance of at LEAST _____ must be maintained between the top of the tubing and the surface of the roof decking.A. 1 in.B. 1 ¼ inC. 1 ½ in.D. 2 in.

O 5. C

O 300.4(E)

O After applying all demand factors, the ampacity of the service-entrance conductors are required to be NOT less than _____ where both the overcurrent device and its assembly are not listed for operation at 100 percent of their rating.A. 125 percent of the loads on the branch

circuitsB. The sum of the loads on the branch

circuitsC. The sum of the noncontinuous loads

plus 125 percent of the continuous loadsD. The sum of all branch-circuit overcurrent

protection devices.

O 6. C

O 230.42(A)(1)

O The demand factor of any electrical system is the ratio of the maximum demand for a system to:A. The totally connected load of the

system.B. 125% of the total connected load

of the system.C. 125% of the total connected

continuous load of the system.D. 80% of the total connected

noncontinuous load plus 125% of the total connected continuous-load of the system.

O 7. A

O Article 100

O The accessible portion of abandoned supply circuits and interconnecting cables located in an information technology equipment room shall be removed, UNLESS _________.A. Tagged and identified as abandonedB. Identified as Type CMPC. Contained in a racewayD. Disconnected from their supply

source

O 8. C

O 645.5(G)

O A residential branch circuit is to supply two (2) wall-mounted ovens rated at 4 kW each and one (1) 6 kW counter-mounted cooktop. Where all the equipment is 240 volts, single-phase, the branch-circuit conductors supplying this kitchen equipment shall have an ampacity of at LEAST __________.A. 22 amperesB. 27 amperesC. 33 amperesD. 37 amperes

O 9. DO T220.55 Note 4 Treat as one unitO 6kw+4kw+4kw= 14kwO 14-12=2x5=10 O 8000 x 1.10= 8800 watts/ 240V=

36.7 A

O On ac circuits, an ac general-use snap switch may be used for controlling a stationary motor rated 2 hp or less, if 300 volts or less, NOT exceeding _________ of the ampere rating of the switch at its rated voltage.A. 50 percentB. 80 percentC. 115 percentD. 125 percent

O 10. B

O 430.83(C)(2)

O What MINIMUM size THWN copper conductors are required to supply a continuous-duty, 25 hp, 208-volt, 3-phase motor? Given: The motor is on the end of a short conduit run that contains only three (3) conductors, at an ambient temperature of 50°C. Consider the motor termination to be rated for 75°CA. 6 AWGB. 3 AWGC. 2 AWGD. 1 AWG

O 11. D

O T430.250O 430.22O T 310.15(B)(16)O 74.8 x 1.25= 93.5 AO 93.5 / .75 ( Temp Correction)= 124.6

AO Use the 75C col.

O Which of the following statements regarding busways is/are true? Busways shall not be installed _________.A. Where subject to severe physical

damageB. Outdoors or in wet or damp

locations unless identified for such use

C. In hoistwaysD. All of the above are true.

O 12. D

O 368.12(A), (B) and (D)

O Which of the following shall be installed on the critical branch of the emergency system in a health care facility?A. Exit signsB. Nurse call systemsC. Communication systemsD. Fire alarms

O 13. B

O 517.33 (A)(5)

O The emergency controls for attended self-service gasoline stations and convenience stores with motor fuel dispensers must be located NOT more than ________ from the motor fuel dispensers.A. 20 feetB. 50 feetC. 75 feetD. 100 feet

O 14. D

O 514.11(B)

O Which of the following listed wiring methods is not approved for use in assembly locations, UNLESS encased in concrete?A. EMTB. Schedule 80 PVCC. Type MC cableD. Type AC cable

O 15. B

O 518.4(A)

O Where transformer vaults are not protected with an automatic fire-suppression system, they shall be constructed of materials that have a MINIMUM fire-resistance rating of __________.A. 1 hourB. 2 hoursC. 3 hoursD. 4 hours

O 16. C

O 450.42

O What percent of electrical supplied spaces in a recreational vehicle park must have 30-ampere, 125-volt receptacle outlets provided?A. 60 percentB. 70 percentC. 90 percentD. 100 percent

O 17. B

O 551.71

O What is the MINIMUM bend radius of trade size 4 in. rigid metal conduit (RMC) where the bend is not made with a one-shot or full-shoe bender?A. 16 inchesB. 18 inchesC. 24 inchesD. 30 inches

O 18. C

O Cpt. 9, Table 2

O Type AC cable shall NOT be used _______.A. In lengths of more than 6 ft.B. In cable traysC. As concealed feedersD. Where embedded in plaster in

wet locations.

O 19. D

O 320.12(5)

O Where portions of a cable, raceway or sleeve are known to be subjected to different temperatures and where condensation is known to be a problem, the raceway or sleeve shall ________.A. Be filled with an approved

materialB. Have an explosionproof sealC. Be provided with a drainD. Be installed below the level of

the terminations.

O 20. A

O 300.7(A)

O What is the MINIMUM size 75°C copper service-entrance conductors require for a 200 ampere rated commercial service?A. 4/0 THWB. 2/0 THW C. 3/0 THHND. 3/0 THW

O 21. D

O T310.15(B)(16)

O Determine the MINIMUM size THWN copper feeder conductors required by the NEC® to supply the following 480-volt, continuous duty, 3-phase, induction type, Design B, motors. Motor terminations are assumed to be rated at 75 degrees C. 1 – 40 hp1 – 50 hp1 – 60 hp

A. 2/0 AWGB. 3/0 AWGC. 4/0 AWGD. 250 kcmil

O 22. CO 77 x 1.25= 96+65+52= 213 A

O Use 75C column of T310.15(B)(16)

O Two (2) or more motors may be installed without individual overcurrent protection devices if rated less than 1 hp each, and the full-load current rating of each motor does NOT exceed __________, if they are on a 120-volt, 20 ampere branch circuit.A. 2 amperesB. 4 amperesC. 5 amperesD. 6 amperes

O 23. D

O 430.53(A)(1)

O Where a listed packaged spa or hot tub is installed outdoors, the unit is permitted to be cord-and-plug connected, provided the cord is NOT longer than _______ and protected by a GFCI.A. 6 feetB. 10 feetC. 15 feetD. 20 feet

O 24. C

O 680.42(A)(2)

O Given: A three-phase, 480-volt, 100 ampere noncontinuous load is located 390 feet from a panelboard. What MINIMUM size THWN aluminum feeder conductors are required to limit the voltage drop to 3 percent?

(K= 21.2)A. 2 AWGB. 1 AWGC. 1/0 AWGD. 2/0 AWG

O 25. CO 3% of 480V = 14.4

O 1.732KDI / Max. Allowed VD= CMO 1.732 x 21.2 x 100 x 390 / 14.4= 99446 CM

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O Where a hotel has a stationary electric sign installed inside a decorative fountain, the sign shall be at LEAST ______ inside the fountain, when measuring from the outside edges of the fountain.A. 2 feetB. 3 feetC. 4 feetD. 5 feet

O 1. D

O 680.57(C)(1)

O In an aircraft hanger, the area that extends upward from the floor level ________ above the upper surface of aircraft wings, power plants and fuel tanks shall be classified as a Class I, Division 2 or Zone 2 location.A. 5 feetB. 6 feetC. 8 feetD. 10 feet

O 2. A

O 513.3

O Conductors supplying outlets for arc and xenon motion picture projectors of the professional type shall be a MINIMUM size of __________.A. 12 AWGB. 10 AWGC. 8 AWGD. 6 AWG

O 3. C

O 540.13

O Where rigid polyvinyl chloride (PVC) conduit is installed underground to supply a gasoline dispensing unit, threaded rigid metal conduit (RMC) or threaded intermediate metal conduit (IMC) shall be used for the LAST ______ of the underground run to where the conduit emerges.A. 2 feetB. 4 feetC. 5 feetD. 6 feet

O 4. A

O 514.8, Ex. 2

O Where electrical metallic tubing (EMT) is installed under metal-corrugated sheet roofing decking, a clearance of at LEAST _____ must be maintained between the top of the tubing and the surface of the roof decking.A. 1 in.B. 1 ¼ inC. 1 ½ in.D. 2 in.

O 5. C

O 300.4(E)

O After applying all demand factors, the ampacity of the service-entrance conductors are required to be NOT less than _____ where both the overcurrent device and its assembly are not listed for operation at 100 percent of their rating.A. 125 percent of the loads on the branch

circuitsB. The sum of the loads on the branch

circuitsC. The sum of the noncontinuous loads

plus 125 percent of the continuous loadsD. The sum of all branch-circuit overcurrent

protection devices.

O 6. C

O 230.42(A)(1)

O The demand factor of any electrical system is the ratio of the maximum demand for a system to:A. The totally connected load of the

system.B. 125% of the total connected load

of the system.C. 125% of the total connected

continuous load of the system.D. 80% of the total connected

noncontinuous load plus 125% of the total connected continuous-load of the system.

O 7. A

O Article 100

O The accessible portion of abandoned supply circuits and interconnecting cables located in an information technology equipment room shall be removed, UNLESS _________.A. Tagged and identified as abandonedB. Identified as Type CMPC. Contained in a racewayD. Disconnected from their supply

source

O 8. C

O 645.5(G)

O A residential branch circuit is to supply two (2) wall-mounted ovens rated at 4 kW each and one (1) 6 kW counter-mounted cooktop. Where all the equipment is 240 volts, single-phase, the branch-circuit conductors supplying this kitchen equipment shall have an ampacity of at LEAST __________.A. 22 amperesB. 27 amperesC. 33 amperesD. 37 amperes

O 9. DO T220.55 Note 4 Treat as one unitO 6kw+4kw+4kw= 14kwO 14-12=2x5=10 O 8000 x 1.10= 8800 watts/ 240V=

36.7 A

O On ac circuits, an ac general-use snap switch may be used for controlling a stationary motor rated 2 hp or less, if 300 volts or less, NOT exceeding _________ of the ampere rating of the switch at its rated voltage.A. 50 percentB. 80 percentC. 115 percentD. 125 percent

O 10. B

O 430.83(C)(2)

O What MINIMUM size THWN copper conductors are required to supply a continuous-duty, 25 hp, 208-volt, 3-phase motor? Given: The motor is on the end of a short conduit run that contains only three (3) conductors, at an ambient temperature of 50°C. Consider the motor termination to be rated for 75°CA. 6 AWGB. 3 AWGC. 2 AWGD. 1 AWG

O 11. D

O T430.250O 430.22O T 310.15(B)(16)O 74.8 x 1.25= 93.5 AO 93.5 / .75 ( Temp Correction)= 124.6

AO Use the 75C col.

O Which of the following statements regarding busways is/are true? Busways shall not be installed _________.A. Where subject to severe physical

damageB. Outdoors or in wet or damp

locations unless identified for such use

C. In hoistwaysD. All of the above are true.

O 12. D

O 368.12(A), (B) and (D)

O Which of the following shall be installed on the critical branch of the emergency system in a health care facility?A. Exit signsB. Nurse call systemsC. Communication systemsD. Fire alarms

O 13. B

O 517.33 (A)(5)

O The emergency controls for attended self-service gasoline stations and convenience stores with motor fuel dispensers must be located NOT more than ________ from the motor fuel dispensers.A. 20 feetB. 50 feetC. 75 feetD. 100 feet

O 14. D

O 514.11(B)

O Which of the following listed wiring methods is not approved for use in assembly locations, UNLESS encased in concrete?A. EMTB. Schedule 80 PVCC. Type MC cableD. Type AC cable

O 15. B

O 518.4(A)

O Where transformer vaults are not protected with an automatic fire-suppression system, they shall be constructed of materials that have a MINIMUM fire-resistance rating of __________.A. 1 hourB. 2 hoursC. 3 hoursD. 4 hours

O 16. C

O 450.42

O What percent of electrical supplied spaces in a recreational vehicle park must have 30-ampere, 125-volt receptacle outlets provided?A. 60 percentB. 70 percentC. 90 percentD. 100 percent

O 17. B

O 551.71

O What is the MINIMUM bend radius of trade size 4 in. rigid metal conduit (RMC) where the bend is not made with a one-shot or full-shoe bender?A. 16 inchesB. 18 inchesC. 24 inchesD. 30 inches

O 18. C

O Cpt. 9, Table 2

O Type AC cable shall NOT be used _______.A. In lengths of more than 6 ft.B. In cable traysC. As concealed feedersD. Where embedded in plaster in

wet locations.

O 19. D

O 320.12(5)

O Where portions of a cable, raceway or sleeve are known to be subjected to different temperatures and where condensation is known to be a problem, the raceway or sleeve shall ________.A. Be filled with an approved

materialB. Have an explosionproof sealC. Be provided with a drainD. Be installed below the level of

the terminations.

O 20. A

O 300.7(A)

O What is the MINIMUM size 75°C copper service-entrance conductors require for a 200 ampere rated commercial service?A. 4/0 THWB. 2/0 THW C. 3/0 THHND. 3/0 THW

O 21. D

O T310.15(B)(16)

O Determine the MINIMUM size THWN copper feeder conductors required by the NEC® to supply the following 480-volt, continuous duty, 3-phase, induction type, Design B, motors. Motor terminations are assumed to be rated at 75 degrees C. 1 – 40 hp1 – 50 hp1 – 60 hp

A. 2/0 AWGB. 3/0 AWGC. 4/0 AWGD. 250 kcmil

O 22. CO 77 x 1.25= 96+65+52= 213 A

O Use 75C column of T310.15(B)(16)

O Two (2) or more motors may be installed without individual overcurrent protection devices if rated less than 1 hp each, and the full-load current rating of each motor does NOT exceed __________, if they are on a 120-volt, 20 ampere branch circuit.A. 2 amperesB. 4 amperesC. 5 amperesD. 6 amperes

O 23. D

O 430.53(A)(1)

O Where a listed packaged spa or hot tub is installed outdoors, the unit is permitted to be cord-and-plug connected, provided the cord is NOT longer than _______ and protected by a GFCI.A. 6 feetB. 10 feetC. 15 feetD. 20 feet

O 24. C

O 680.42(A)(2)

O Given: A three-phase, 480-volt, 100 ampere noncontinuous load is located 390 feet from a panelboard. What MINIMUM size THWN aluminum feeder conductors are required to limit the voltage drop to 3 percent?

(K= 21.2)A. 2 AWGB. 1 AWGC. 1/0 AWGD. 2/0 AWG

O 25. CO 3% of 480V = 14.4

O 1.732KDI / Max. Allowed VD= CMO 1.732 x 21.2 x 100 x 390 / 14.4= 99446 CM