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Electrical level 3 Module 7 Exam Questions
And Answers 100% Guaranteed Pass.
Which force allows the transfer of power from one circuit to another or creates a new service -
Answer✔Mutal induction
What are the three parts of a basic transformer - Answer✔Two coils and a single magnetic core
Why are transformers grounded - Answer✔To stabilize voltage, remove static electricity, ground
case in case of contact
Transformers are rated in - Answer✔Kilovaltampres (KVA)
Name the advantages and disadvantages of auto transformers - Answer✔Lower purchase price,
better voltage regulation, lower sound levels and smaller size
To ensure maximum safety in a control transformer the secondary control circuit is -
Answer✔Isolated from the primary line circuit
In a step down transformer with a turn ratio of 8:1 what will be the voltage on the secondary if
the primary voltage is 4160 - Answer✔520v
Which type of transformers can be ventilated , air cooled, or sealed - Answer✔Dry-type
When a field from one coil cuts through the turns or a second coil, what actions occur -
Answer✔Induction
What is the voltage of the secondary in a transformer with 200 turns in the primary , 20 turns in
the secondary and an input of 4400v - Answer✔440
Three types of transformer core construction are - Answer✔Butt,wound, and mitered cores
The installation of resistors and reactors are covered in nec article - Answer✔470
What is the reactance - Answer✔Opposition to AC due to capacitance and /or inductance
In a step down transformer what happens to the current in the same circuit - Answer✔It is
stepped up
Which forces are always present in an AC circuit - Answer✔Inductance and true power
1|Page
Electrical level 3 Module 7 Exam Questions
And Answers 100% Guaranteed Pass.
Which force allows the transfer of power from one circuit to another or creates a new service -
Answer✔Mutal induction
What are the three parts of a basic transformer - Answer✔Two coils and a single magnetic core
Why are transformers grounded - Answer✔To stabilize voltage, remove static electricity, ground
case in case of contact
Transformers are rated in - Answer✔Kilovaltampres (KVA)
Name the advantages and disadvantages of auto transformers - Answer✔Lower purchase price,
better voltage regulation, lower sound levels and smaller size
To ensure maximum safety in a control transformer the secondary control circuit is -
Answer✔Isolated from the primary line circuit
In a step down transformer with a turn ratio of 8:1 what will be the voltage on the secondary if
the primary voltage is 4160 - Answer✔520v
Which type of transformers can be ventilated , air cooled, or sealed - Answer✔Dry-type
When a field from one coil cuts through the turns or a second coil, what actions occur -
Answer✔Induction
What is the voltage of the secondary in a transformer with 200 turns in the primary , 20 turns in
the secondary and an input of 4400v - Answer✔440
Three types of transformer core construction are - Answer✔Butt,wound, and mitered cores
The installation of resistors and reactors are covered in nec article - Answer✔470
What is the reactance - Answer✔Opposition to AC due to capacitance and /or inductance
In a step down transformer what happens to the current in the same circuit - Answer✔It is
stepped up
Which forces are always present in an AC circuit - Answer✔Inductance and true power
1|Page
