, TESTBANK FOR Electrical Wiring Commercial
Textbook 9th Edition Ray C. Mullin
Notes
1- The file is chapter after chapter.
2- We have shown you few pages sample.
3- The file contains all Appendix and Excel sheet
if it exists.
4- We have all what you need, we make update
at every time. There are many new editions
waiting you.
5- If you think you purchased the wrong file You
can contact us at every time, we can replace it
with true one.
Our email:
,Name: Class: Date:
Unit 1 - Commercial Building Plans and Specifications
1. What percentage of the contract price is normally made up by performance bond?
a. 25% b. 50%
c. 100% d. 200%
ANSWER: c
2. What is the name given to the brief description of the project and its location?
a. proposal b. notice to bidder
c. instruction to bidder d. addendum
ANSWER: c
3. Which term refers to the document that outlines modifications made to the contract documents before
bidding closes?
a. surety bond b. specification
c. change order d. addendum
ANSWER: d
4. What is the specification division number for electrical work?
a. 11 b. 23
c. 26 d. 48
ANSWER: c
5. On what drawing will you find the dimensions of the lot?
a. site plan b. elevation
c. floor plan d. section
ANSWER: a
6. What drawing shows the vertical faces of a building?
a. floor plan b. elevation
c. section d. site plan
ANSWER: b
7. What type of scale is used for a drawing that is measured in feet and inches?
a. engineering b. imperial
c. metric d. architectural
ANSWER: d
8. If told to look for a drawing marked B-B, what type of drawing are you looking at?
a. legend of symbols b. details drawing
c. architectural drawing d. elevation drawing
ANSWER: b
9. According to the Supplementary General Conditions, who is responsible for any utilities that are
damaged?
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,Name: Class: Date:
Unit 1 - Commercial Building Plans and Specifications
a. the contractor b. the municipal government
c. the crew d. the site owner
ANSWER: a
10. What is the specification division number for equipment work?
a. 11 b. 23
c. 26 d. 48
ANSWER: a
11. Which term is often used for the construction plans for a building?
a. shop drawings b. architecturals
c. blueprints d. plots
ANSWER: b
12. Which drawing is the architectural floor plan for the basement?
a. A1 b. A2
c. A3 d. A4
ANSWER: b
13. On which drawing would you find the legend for electrical symbols?
a. A1 b. E1
c. E2 d. E3
ANSWER: b
14. Which document is required to fix errors in the drawings that are noticed after the job has been
awarded?
a. change order b. addendum
c. alternate d. proposal
ANSWER: a
15. Besides the CSA, which organization is accredited to provide approval of electrical equipment in
Canada?
a. NSC b. CEC
c. ULC d. SCC
ANSWER: c
16. When was the first edition of the Canadian Electrical Code finalized?
a. 1927 b. 1930
c. 1955 d. 1966
ANSWER: a
17. What is the multiplier provided in the CEC for converting metres to feet?
a. 0.621 b. 2.205
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,Name: Class: Date:
Unit 1 - Commercial Building Plans and Specifications
c. 3.281 d. 10.764
ANSWER: c
18. How often is the CEC updated?
a. every year b. every two years
c. every three years d. every five years
ANSWER: c
19. What is the metric designator for a raceway of trade size 2"?
a. 21 mm b. 41 mm
c. 53 mm d. 78 mm
ANSWER: c
20. In the metric system, what is the prefix for 1 000 000?
a. giga- b. centi-
c. mega- d. kilo-
ANSWER: c
21. Which term in the CEC is used to indicate a mandatory requirement?
a. approved b. may
c. shall d. practicable
ANSWER: c
22. How many pounds are there in one kilogram?
a. 0.7376 b. 1.0
c. 2.205 d. 3.0
ANSWER: c
23. What is the unit symbol for millimetres?
a. mm b. cm
c. m d. km
ANSWER: a
24. What does the word kilo- mean in SI prefixes?
a. one-tenth b. ten
c. one thousand d. one million
ANSWER: c
25. What size is a 3/4 conduit in metric?
a. 12 mm b. 16 mm
c. 21 mm d. 27 mm
ANSWER: c
Copyright Cengage Learning. Powered by Cognero. Page 3
,Name: Class: Date:
Unit 1 - Commercial Building Plans and Specifications
26. What is the unit symbol for ohms?
a. ? b. O
c. µF d. km
ANSWER: a
27. According to the job specifications, who is responsible for installing the commercial building’s
primary service and transformer?
a. the municipal government b. the electrical contractor
c. the supply authority d. the site owner
ANSWER: c
28. Whose responsibility is it to obtain the electrical permit?
a. the electrical contractor b. the municipal government
c. the crew d. the site owner
ANSWER: a
29. On Drawing E3, the measurement of the drug store’s track lighting is 89 mm. What is the track’s
actual length?
a. 0.89 m b. 4.4 m
c. 8.9 m d. 17.8 m
ANSWER: b
30. What does the “instruction to bidders” document encompass?
ANSWER: This section provides the contractor with a brief description of the project, its location, and
how the job is to be bid (lump sum, one contract, or separate contracts for the various
construction trades, such as plumbing, heating, electrical, and general). In addition, bidders
are told where and how the plans and specifications can be obtained prior to the preparation of
the bid, how to make out the proposal form, where and when to deliver the proposal, the
amount of any bid deposits required, any performance bonds required, and bidders’
qualifications. Other specific instructions may be given, depending upon the job.
31. What is involved when estimating an electrical project?
ANSWER: The main steps in estimating include the following:
Preparing a material take-off involves counting, measuring, and listing the quantities of
materials and equipment required to complete the installation. This is often done in a way that
will allow easy assignment of labour units.
Tabulating and pricing is the process of assigning labour units and prices for everything on the
material list. Standard labour units are used for this, as found in various estimating manuals.
Summarizing the total projected costs means putting together the costs of material, labour, job
factors (such as working heights, multiple buildings), direct job expenses (such as equipment,
travel and warehousing), overhead, and profit.
32. What is the purpose of the CEC, and how is it applied in each province and city?
ANSWER: As outlined in CEC Section 0, Object, the purpose of the code is to establish safety standards
for the installation and maintenance of electrical equipment. In its preparation, consideration
has been given to the prevention of fire and shock hazards, as well as proper maintenance and
Copyright Cengage Learning. Powered by Cognero. Page 4
,Name: Class: Date:
Unit 1 - Commercial Building Plans and Specifications
operation. The CEC is the basic standard for the installation and construction of all electrical
systems in Canada. However, some provincial and local codes contain specific amendments
that must be adhered to in all electrical wiring installations under their jurisdiction.
33. The CEC definition for the term accessible may refer to either equipment or wiring methods. Explain
the difference.
ANSWER: Referring to Section 0, Definitions,
Accessible (as applied to equipment) means admitting close approach because the equipment
is not protected by elevation, locked doors, or other means.
Accessible (as applied to wiring methods) means
(a) not permanently enclosed in the building structure or finish, or
(b) may be removed without disturbing the building structure or finish.
34. How are commas, periods, and spaces used to make long numbers easier to read?
ANSWER: In the United States, it is the practice to use a period as the decimal marker and a comma to
separate a string of numbers into groups of three for easier reading. In many other countries,
the comma is used as the decimal marker and spaces are used to separate a string of numbers
into groups of three. The SI system, taking something from both, uses the period as the
decimal marker and the space to separate a string of numbers into groups of three, starting
from the decimal point and counting in either direction, for example, 12 345.789 99. An
exception to this occurs when there are four numbers on either side of the decimal point. In
this case, the third and fourth numbers from the decimal point are not separated, for example,
2015.1415.
Copyright Cengage Learning. Powered by Cognero. Page 5
,Name: Class: Date:
Unit 2 - The Electric Service
1. Who buys the substation equipment for the building?
a. utility company b. building owner
c. electrical contractor d. general contractor
ANSWER: b
2. What size transformer provides the electrical power for the commercial building?
a. 100 kVa b. 350 kVA
c. 600 kVA d. 1000 kVA
ANSWER: b
3. What is secondary voltage rating for the commercial building’s pad-mounted transformer?
a. 120 V b. 120/208 V
c. 347 V d. 347/600 V
ANSWER: b
4. Today’s liquid-filled transformer windings are immersed in acceptable non-toxic liquids. What is one
of the main functions?
a. conducting electricity b. impedance
c. short-circuit protection d. cooling
ANSWER: d
5. What is the main advantage of dry-type transformers over comparably rated liquid-filled transformers?
a. They are lighter in weight. b. They do not require cooling.
c. The have better dielectrics. d. The have higher impedance.
ANSWER: a
6. What is the maximum overcurrent protection required for the secondary of a dry-type transformer
whose primary and secondary voltage are under 750 V, with secondary current of 300 A, and no
individual overcurrent protection on the primary?
a. 300 A b. 350 A
c. 375 A d. 400 A
ANSWER: b
7. Which connection scheme has the advantage of being able to provide either three-phase or three-phase
and single-phase power using only two transformers?
a. two-wire single-phase b. three-wire closed delta
c. three-wire open delta d. four-wire open wye
ANSWER: c
8. Which of the following established the regulations governing the method of bringing the electric power
into a building?
a. utility company b. building owner
c. electrical contractor d. general contractor
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,Name: Class: Date:
Unit 2 - The Electric Service
ANSWER: a
9. What is one of the two basic methods of metering?
a. low-voltage metering b. pulsed metering
c. intermediate-voltage metering d. secondary high-voltage metering
ANSWER: a
10. Where are the meters installed in the commercial building?
a. panel socket b. transformer
c. feeder d. switchboard
ANSWER: d
11. Which of the following is NOT required when the transformer is installed at a location far from the
building?
a. service entrance conductors b. main switch or switches
c. grounding rods d. metering equipment
ANSWER: c
12. What size fuse is placed in the 200-ampere owner’s disconnect at the service-entrance equipment?
a. 100 amperes b. 150 amperes
c. 160 amperes d. 2000 amperes
ANSWER: b
13. What size are the conduits that carry the service entrance conductors?
a. 63 mm b. 78 mm
c. 91 mm d. 103 mm
ANSWER: d
14. How many 750 kcmil conductors go into each service-entrance conduit?
a. 1 b. 2
c. 3 d. 4
ANSWER: d
15. What is the maximum number of consumer services per building permitted by the CEC, unless special
permission is given?
a. 1 b. 2
c. 4 d. 10
ANSWER: c
16. How many consumer services are permitted by the CEC in one location?
a. 1 b. 2
c. 3 d. 4
ANSWER: d
Copyright Cengage Learning. Powered by Cognero. Page 2
, Name: Class: Date:
Unit 2 - The Electric Service
17. What common factor influences the size of the ground-fault current?
a. the magnetic permeability of the grounding path
b. the length of the grounding path
c. the impedance of the grounding path
d. the elevation of the grounding path
ANSWER: c
18. In a three-phase, four-wire electrical system, which conductor must be grounded?
a. line b. phase
c. grounding d. neutral
ANSWER: d
19. Which term refers to the conductor used to connect the service equipment to the grounding electrode?
a. bonding conductor b. grounding conductor
c. grounding electrode d. grounding
ANSWER: b
20. Which term refers to the conductor that connects the non-current-carrying parts of electrical
equipment to the service equipment or grounding conductor?
a. bonding conductor b. grounding conductor
c. grounding electrode d. grounding
ANSWER: a
21. What is the minimum distance that ground rods can be apart?
a. 1 m b. 2 m
c. 3 m d. 5 m
ANSWER: b
22. What is term when conductive parts are of equal electrical potential?
a. impedance ground system b. grounding conductor
c. grounding electrode d. equipotentiality
ANSWER: d
23. What size copper bonding jumper would be installed for a metal raceway containing 400 A
conductors?
a. No. 2 AWG b. No. 4 AWG
c. No. 6 AWG d. No. 8 AWG
ANSWER: b
24. What size copper bonding wire would be installed to bond a system whose phase conductors have an
ampacity rating of 125 A?
a. No. 4 AWG b. No. 6 AWG
c. No. 8 AWG d. No. 10 AWG
Copyright Cengage Learning. Powered by Cognero. Page 3
Textbook 9th Edition Ray C. Mullin
Notes
1- The file is chapter after chapter.
2- We have shown you few pages sample.
3- The file contains all Appendix and Excel sheet
if it exists.
4- We have all what you need, we make update
at every time. There are many new editions
waiting you.
5- If you think you purchased the wrong file You
can contact us at every time, we can replace it
with true one.
Our email:
,Name: Class: Date:
Unit 1 - Commercial Building Plans and Specifications
1. What percentage of the contract price is normally made up by performance bond?
a. 25% b. 50%
c. 100% d. 200%
ANSWER: c
2. What is the name given to the brief description of the project and its location?
a. proposal b. notice to bidder
c. instruction to bidder d. addendum
ANSWER: c
3. Which term refers to the document that outlines modifications made to the contract documents before
bidding closes?
a. surety bond b. specification
c. change order d. addendum
ANSWER: d
4. What is the specification division number for electrical work?
a. 11 b. 23
c. 26 d. 48
ANSWER: c
5. On what drawing will you find the dimensions of the lot?
a. site plan b. elevation
c. floor plan d. section
ANSWER: a
6. What drawing shows the vertical faces of a building?
a. floor plan b. elevation
c. section d. site plan
ANSWER: b
7. What type of scale is used for a drawing that is measured in feet and inches?
a. engineering b. imperial
c. metric d. architectural
ANSWER: d
8. If told to look for a drawing marked B-B, what type of drawing are you looking at?
a. legend of symbols b. details drawing
c. architectural drawing d. elevation drawing
ANSWER: b
9. According to the Supplementary General Conditions, who is responsible for any utilities that are
damaged?
Copyright Cengage Learning. Powered by Cognero. Page 1
,Name: Class: Date:
Unit 1 - Commercial Building Plans and Specifications
a. the contractor b. the municipal government
c. the crew d. the site owner
ANSWER: a
10. What is the specification division number for equipment work?
a. 11 b. 23
c. 26 d. 48
ANSWER: a
11. Which term is often used for the construction plans for a building?
a. shop drawings b. architecturals
c. blueprints d. plots
ANSWER: b
12. Which drawing is the architectural floor plan for the basement?
a. A1 b. A2
c. A3 d. A4
ANSWER: b
13. On which drawing would you find the legend for electrical symbols?
a. A1 b. E1
c. E2 d. E3
ANSWER: b
14. Which document is required to fix errors in the drawings that are noticed after the job has been
awarded?
a. change order b. addendum
c. alternate d. proposal
ANSWER: a
15. Besides the CSA, which organization is accredited to provide approval of electrical equipment in
Canada?
a. NSC b. CEC
c. ULC d. SCC
ANSWER: c
16. When was the first edition of the Canadian Electrical Code finalized?
a. 1927 b. 1930
c. 1955 d. 1966
ANSWER: a
17. What is the multiplier provided in the CEC for converting metres to feet?
a. 0.621 b. 2.205
Copyright Cengage Learning. Powered by Cognero. Page 2
,Name: Class: Date:
Unit 1 - Commercial Building Plans and Specifications
c. 3.281 d. 10.764
ANSWER: c
18. How often is the CEC updated?
a. every year b. every two years
c. every three years d. every five years
ANSWER: c
19. What is the metric designator for a raceway of trade size 2"?
a. 21 mm b. 41 mm
c. 53 mm d. 78 mm
ANSWER: c
20. In the metric system, what is the prefix for 1 000 000?
a. giga- b. centi-
c. mega- d. kilo-
ANSWER: c
21. Which term in the CEC is used to indicate a mandatory requirement?
a. approved b. may
c. shall d. practicable
ANSWER: c
22. How many pounds are there in one kilogram?
a. 0.7376 b. 1.0
c. 2.205 d. 3.0
ANSWER: c
23. What is the unit symbol for millimetres?
a. mm b. cm
c. m d. km
ANSWER: a
24. What does the word kilo- mean in SI prefixes?
a. one-tenth b. ten
c. one thousand d. one million
ANSWER: c
25. What size is a 3/4 conduit in metric?
a. 12 mm b. 16 mm
c. 21 mm d. 27 mm
ANSWER: c
Copyright Cengage Learning. Powered by Cognero. Page 3
,Name: Class: Date:
Unit 1 - Commercial Building Plans and Specifications
26. What is the unit symbol for ohms?
a. ? b. O
c. µF d. km
ANSWER: a
27. According to the job specifications, who is responsible for installing the commercial building’s
primary service and transformer?
a. the municipal government b. the electrical contractor
c. the supply authority d. the site owner
ANSWER: c
28. Whose responsibility is it to obtain the electrical permit?
a. the electrical contractor b. the municipal government
c. the crew d. the site owner
ANSWER: a
29. On Drawing E3, the measurement of the drug store’s track lighting is 89 mm. What is the track’s
actual length?
a. 0.89 m b. 4.4 m
c. 8.9 m d. 17.8 m
ANSWER: b
30. What does the “instruction to bidders” document encompass?
ANSWER: This section provides the contractor with a brief description of the project, its location, and
how the job is to be bid (lump sum, one contract, or separate contracts for the various
construction trades, such as plumbing, heating, electrical, and general). In addition, bidders
are told where and how the plans and specifications can be obtained prior to the preparation of
the bid, how to make out the proposal form, where and when to deliver the proposal, the
amount of any bid deposits required, any performance bonds required, and bidders’
qualifications. Other specific instructions may be given, depending upon the job.
31. What is involved when estimating an electrical project?
ANSWER: The main steps in estimating include the following:
Preparing a material take-off involves counting, measuring, and listing the quantities of
materials and equipment required to complete the installation. This is often done in a way that
will allow easy assignment of labour units.
Tabulating and pricing is the process of assigning labour units and prices for everything on the
material list. Standard labour units are used for this, as found in various estimating manuals.
Summarizing the total projected costs means putting together the costs of material, labour, job
factors (such as working heights, multiple buildings), direct job expenses (such as equipment,
travel and warehousing), overhead, and profit.
32. What is the purpose of the CEC, and how is it applied in each province and city?
ANSWER: As outlined in CEC Section 0, Object, the purpose of the code is to establish safety standards
for the installation and maintenance of electrical equipment. In its preparation, consideration
has been given to the prevention of fire and shock hazards, as well as proper maintenance and
Copyright Cengage Learning. Powered by Cognero. Page 4
,Name: Class: Date:
Unit 1 - Commercial Building Plans and Specifications
operation. The CEC is the basic standard for the installation and construction of all electrical
systems in Canada. However, some provincial and local codes contain specific amendments
that must be adhered to in all electrical wiring installations under their jurisdiction.
33. The CEC definition for the term accessible may refer to either equipment or wiring methods. Explain
the difference.
ANSWER: Referring to Section 0, Definitions,
Accessible (as applied to equipment) means admitting close approach because the equipment
is not protected by elevation, locked doors, or other means.
Accessible (as applied to wiring methods) means
(a) not permanently enclosed in the building structure or finish, or
(b) may be removed without disturbing the building structure or finish.
34. How are commas, periods, and spaces used to make long numbers easier to read?
ANSWER: In the United States, it is the practice to use a period as the decimal marker and a comma to
separate a string of numbers into groups of three for easier reading. In many other countries,
the comma is used as the decimal marker and spaces are used to separate a string of numbers
into groups of three. The SI system, taking something from both, uses the period as the
decimal marker and the space to separate a string of numbers into groups of three, starting
from the decimal point and counting in either direction, for example, 12 345.789 99. An
exception to this occurs when there are four numbers on either side of the decimal point. In
this case, the third and fourth numbers from the decimal point are not separated, for example,
2015.1415.
Copyright Cengage Learning. Powered by Cognero. Page 5
,Name: Class: Date:
Unit 2 - The Electric Service
1. Who buys the substation equipment for the building?
a. utility company b. building owner
c. electrical contractor d. general contractor
ANSWER: b
2. What size transformer provides the electrical power for the commercial building?
a. 100 kVa b. 350 kVA
c. 600 kVA d. 1000 kVA
ANSWER: b
3. What is secondary voltage rating for the commercial building’s pad-mounted transformer?
a. 120 V b. 120/208 V
c. 347 V d. 347/600 V
ANSWER: b
4. Today’s liquid-filled transformer windings are immersed in acceptable non-toxic liquids. What is one
of the main functions?
a. conducting electricity b. impedance
c. short-circuit protection d. cooling
ANSWER: d
5. What is the main advantage of dry-type transformers over comparably rated liquid-filled transformers?
a. They are lighter in weight. b. They do not require cooling.
c. The have better dielectrics. d. The have higher impedance.
ANSWER: a
6. What is the maximum overcurrent protection required for the secondary of a dry-type transformer
whose primary and secondary voltage are under 750 V, with secondary current of 300 A, and no
individual overcurrent protection on the primary?
a. 300 A b. 350 A
c. 375 A d. 400 A
ANSWER: b
7. Which connection scheme has the advantage of being able to provide either three-phase or three-phase
and single-phase power using only two transformers?
a. two-wire single-phase b. three-wire closed delta
c. three-wire open delta d. four-wire open wye
ANSWER: c
8. Which of the following established the regulations governing the method of bringing the electric power
into a building?
a. utility company b. building owner
c. electrical contractor d. general contractor
Copyright Cengage Learning. Powered by Cognero. Page 1
,Name: Class: Date:
Unit 2 - The Electric Service
ANSWER: a
9. What is one of the two basic methods of metering?
a. low-voltage metering b. pulsed metering
c. intermediate-voltage metering d. secondary high-voltage metering
ANSWER: a
10. Where are the meters installed in the commercial building?
a. panel socket b. transformer
c. feeder d. switchboard
ANSWER: d
11. Which of the following is NOT required when the transformer is installed at a location far from the
building?
a. service entrance conductors b. main switch or switches
c. grounding rods d. metering equipment
ANSWER: c
12. What size fuse is placed in the 200-ampere owner’s disconnect at the service-entrance equipment?
a. 100 amperes b. 150 amperes
c. 160 amperes d. 2000 amperes
ANSWER: b
13. What size are the conduits that carry the service entrance conductors?
a. 63 mm b. 78 mm
c. 91 mm d. 103 mm
ANSWER: d
14. How many 750 kcmil conductors go into each service-entrance conduit?
a. 1 b. 2
c. 3 d. 4
ANSWER: d
15. What is the maximum number of consumer services per building permitted by the CEC, unless special
permission is given?
a. 1 b. 2
c. 4 d. 10
ANSWER: c
16. How many consumer services are permitted by the CEC in one location?
a. 1 b. 2
c. 3 d. 4
ANSWER: d
Copyright Cengage Learning. Powered by Cognero. Page 2
, Name: Class: Date:
Unit 2 - The Electric Service
17. What common factor influences the size of the ground-fault current?
a. the magnetic permeability of the grounding path
b. the length of the grounding path
c. the impedance of the grounding path
d. the elevation of the grounding path
ANSWER: c
18. In a three-phase, four-wire electrical system, which conductor must be grounded?
a. line b. phase
c. grounding d. neutral
ANSWER: d
19. Which term refers to the conductor used to connect the service equipment to the grounding electrode?
a. bonding conductor b. grounding conductor
c. grounding electrode d. grounding
ANSWER: b
20. Which term refers to the conductor that connects the non-current-carrying parts of electrical
equipment to the service equipment or grounding conductor?
a. bonding conductor b. grounding conductor
c. grounding electrode d. grounding
ANSWER: a
21. What is the minimum distance that ground rods can be apart?
a. 1 m b. 2 m
c. 3 m d. 5 m
ANSWER: b
22. What is term when conductive parts are of equal electrical potential?
a. impedance ground system b. grounding conductor
c. grounding electrode d. equipotentiality
ANSWER: d
23. What size copper bonding jumper would be installed for a metal raceway containing 400 A
conductors?
a. No. 2 AWG b. No. 4 AWG
c. No. 6 AWG d. No. 8 AWG
ANSWER: b
24. What size copper bonding wire would be installed to bond a system whose phase conductors have an
ampacity rating of 125 A?
a. No. 4 AWG b. No. 6 AWG
c. No. 8 AWG d. No. 10 AWG
Copyright Cengage Learning. Powered by Cognero. Page 3
