Question 1

In the electrical industry, 'wires' are generally referred to as

Accepted Answer

A)   flex'
B)   conductors'
C)   cores'
D)   cables'E) A) and D)
F) C) and D)

Question 2

For a stranded '7/0.85' cable, the figure '0.85' refers to the

Accepted Answer

A)   the diameter of individual strands
B)   the cross-sectional area of individual strands
C)   the diameter of the conductor
D)   the cross-sectional area of the conductorE) All of the above
F) B) and D)

Question 3

A 'cable' consists of

Accepted Answer

A)   one or more conductors
B)   one or more insulated conductors
C)   one or more insulated conductors enclosed in a protective sheathD) B) and C)
E) A) and C)

Question 4

The purpose of a cable's outer sheath is to

Accepted Answer

A)   provide limited mechanical protection
B)   prevent the ingress of moisture
C)   contain the individual cores
D)   all of the aboveE) A) and B)
F) C) and D)

Question 5

For cables manufactured for use in the EU, the insulation colour for a neutral conductor is

Accepted Answer

A)   red
B)   brown
C)   black
D)   blueE) C) and D)
F) B) and D) D

Question 6

A cable, comprising a line, neutral, and protective (earth)  conductor, is termed a

Accepted Answer

A)   single-core conductor'
B)   two-core conductor'
C)   three-core conductor'D) None of the above
E) B) and C)

Question 7

The purpose of armouring a cable is to

Accepted Answer

A)   protect it against mechanical damage
B)   relieve and electric stress
C)   prevent the ingress of moisture
D)   all of the aboveE) A) and D)
F) B) and C)

Question 8

The term, 'live conductors', refers to a cable's

Accepted Answer

A)   line conductor(s) 
B)   neutral conductor
C)   line and neutral conductors
D)   line, neutral, and earth conductorsE) A) and D)
F) C) and D) C

Question 9

Stranded conductors are manufactured to

Accepted Answer

A)   ease their manufacture
B)   increase their current ratings
C)   increase the flexibility of a cable
D)   improve their heat dissipationE) A) and B)
F) A) and D)

Question 10

For cables manufactured for use in the EU, the insulation colour for a line conductor is

Accepted Answer

A)   red
B)   brown
C)   black
D)   blueE) C) and D)
F) All of the above

Question 11

Insulation is specified, within the UK's Wiring Regulations, in terms of

Accepted Answer

A)   the materials from which it is manufactured
B)   its anticipated operating temperature
C)   its method of manufacture
D)   its insulation resistanceE) A) and B)
F) None of the above

Question 12

Cables with 'wedge-shaped' cores are manufactured to

Accepted Answer

A)   improve their current-carrying capacity
B)   reduce the electrical stress within their insulation
C)   improve their flexibility
D)   reduce their overall diameterE) A) and D)
F) A) and C) D

Question 13

What property makes aluminium generally unsuitable for domestic wiring systems?

Accepted Answer

A)   poor conductivity compared to copper
B)   unreliable pressure connections due to 'cold flow'
C)   poor conducting quality of its corrosive film
D)   low melting pointE) B) and D)
F) A) and D)

Question 14

The maximum electric field that can be sustained by a dielectric before breakdown occurs' describes an insulator's

Accepted Answer

A)   insulation resistance
B)   dielectric strength
C)   resistivity
D)   voltage gradientE) A) and B)
F) B) and D)

Question 15

Place the following conductors in order, from best to worst in terms of their conductivity: aluminium, silver, gold, and copper

Accepted Answer

A)   gold, silver, copper, aluminium
B)   silver, gold, copper, aluminium
C)   silver, copper, gold, aluminium
D)   silver, copper, aluminium, goldE) A) and D)
F) B) and C)

Exam 5: Practical Conductors and Insulators

In the electrical industry, 'wires' are generally referred to as

Correct Answer
verified

For a stranded '7/0.85' cable, the figure '0.85' refers to the

Correct Answer
verified

A 'cable' consists of

Correct Answer
verified

The purpose of a cable's outer sheath is to

Correct Answer
verified

For cables manufactured for use in the EU, the insulation colour for a neutral conductor is

Correct Answer
verified
D

A cable, comprising a line, neutral, and protective (earth) conductor, is termed a

Correct Answer
verified

The purpose of armouring a cable is to

Correct Answer
verified

The term, 'live conductors', refers to a cable's

Correct Answer
verified
C

Stranded conductors are manufactured to

Correct Answer
verified

For cables manufactured for use in the EU, the insulation colour for a line conductor is

Correct Answer
verified

Insulation is specified, within the UK's Wiring Regulations, in terms of

Correct Answer
verified

Cables with 'wedge-shaped' cores are manufactured to

Correct Answer
verified
D

What property makes aluminium generally unsuitable for domestic wiring systems?

Correct Answer
verified

The maximum electric field that can be sustained by a dielectric before breakdown occurs' describes an insulator's

Correct Answer
verified

Place the following conductors in order, from best to worst in terms of their conductivity: aluminium, silver, gold, and copper

Correct Answer
verified

Exam 5: Practical Conductors and Insulators

In the electrical industry, 'wires' are generally referred to as

Correct AnswerverifiedShow Answer

For a stranded '7/0.85' cable, the figure '0.85' refers to the

Correct AnswerverifiedShow Answer

A 'cable' consists of

Correct AnswerverifiedShow Answer

The purpose of a cable's outer sheath is to

Correct AnswerverifiedShow Answer

For cables manufactured for use in the EU, the insulation colour for a neutral conductor is

Correct AnswerverifiedD

A cable, comprising a line, neutral, and protective (earth) conductor, is termed a

Correct AnswerverifiedShow Answer

The purpose of armouring a cable is to

Correct AnswerverifiedShow Answer

The term, 'live conductors', refers to a cable's

Correct AnswerverifiedC

Stranded conductors are manufactured to

Correct AnswerverifiedShow Answer

For cables manufactured for use in the EU, the insulation colour for a line conductor is

Correct AnswerverifiedShow Answer

Insulation is specified, within the UK's Wiring Regulations, in terms of

Correct AnswerverifiedShow Answer

Cables with 'wedge-shaped' cores are manufactured to

Correct AnswerverifiedD

What property makes aluminium generally unsuitable for domestic wiring systems?

Correct AnswerverifiedShow Answer

The maximum electric field that can be sustained by a dielectric before breakdown occurs' describes an insulator's

Correct AnswerverifiedShow Answer

Place the following conductors in order, from best to worst in terms of their conductivity: aluminium, silver, gold, and copper

Correct AnswerverifiedShow Answer

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D

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C

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D

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