test Unit 28
A transformer in which the secondary voltage is more than the primary voltage is called a(n)_______ transformer.
step-up
A tape-wound core is assembled BY_______.
winding a long continuous tape into a spiral.
The output winding of a transformer is called the ________ winding.
secondary
The amount of current that flows into a transformer primary voltage is called a(n)_____ transformer.
step_down
What type of core is often found on high-voltage distribution transformers?
H-type
A transformer in which the primary and secondary are physically separated and not connected by conductor is called a(n)________ transformer.
Isolation
A transformer that has the same input and output voltage is called a(n)________ transformer.
Isolation
What is magnetically operated device that can change values of voltage,current and impendece without changing frequency?
A transformer
A transformer has a 2:1 turn ratio. 120V is applied to the primary. What is the secondary voltage?
60 v
A tape-wound core is called a(n)________ core.
toroid
The Industrial use transformer that has 240 V or 480V primary and a 120V secondary is called a(n)_________ transformer.
distribution.
A transformer supplying a house with 240/120V has a secondary which is center tap. The conductor connected to the center is called_______ the conductor.
neutral
The power input winding of a transformer is called the _________ winding.
primary
Any transformer flux that does not follow the core and escapes into the surrounding air is called_________.
flux leakage
A transformer has a 240 V primary and a 60V secondary. With a 5 ohm load connected, what is the primary current?
3 A
In a transformer, the turns of primary wire compared to the turns of secondary wire is called the _________ ratio.
turns
In a transformer,even when is no load connected,there will be some current flow known as____________ current.
excitation
Most transformers cores are assembled from many thi. sheets of metal. This type of construction is called_______.
laminated
