Transformers 080204eA

Question 1

What is the efficiency of a transformer?

Answer 1

95% to 98%

Question 2

What are the 3 basic types of transformer construction?

Answer 2

Core type

Shell type

H type

Question 3

What are the main reasons for using a transformer?

Answer 3

To isolate one circuit from another

To change the voltage of the circuit

Question 4

What units are transformers rated in?

Answer 4

Volt-amperes (VA) if less than 1000 VA

Kilo-volt-amperes (kVA) if over 1000 VA

Question 5

If 120V is applied to thr primary winding of a transformer that has 240 turns of wire, how many volts does each turn have?

Answer 5

0.5 V

Question 6

The CEC limits Class 2 transformers to a maximum output of what?

Answer 6

100 VA

Question 7

What is considered the load voltage on a transformer?

Answer 7

Secondary voltage

Question 8

To determine the size of a control transformer what is required?

Answer 8

Load voltage

Load current or amperage draw

Available line voltage

Question 9

What are the 2 basic physical characteristics of transformers

Answer 9

Open transformers

Totally enclosed transformers

Question 10

Where can you install an open transformer?

Answer 10

Must be mounted inside an appliance cabinet or in an electrical enclosure

Question 11

What factors must be considered when selecting a controls transformer?

Answer 11

Location
Auto or isolation 
Primary voltage 
Secondary voltage
Transformer load