4-7

Voltage

A transformer "transforms" or changes electric;

AC but no DC

A transformer operates;

Step-up Transformer

A transformer with a turns ratio of 1000:1 is;

Contains a single coil that serves as both primary and secondary coils

An autotransformer;

Nothing

If DC is applied to the primary coil of a step-up transformer, what is the result in the secondary coil?

Turns ratio will be less than 1

If a transformer produces a large secondary current;

Iron Core

Primary to secondary coupling in a transformer is enhanced by;

Lower than the input current

The output current in a step-up transformer is:

Change voltage

The principal application of a transformer in an x-ray imagining system is to;

Amplitude of the voltage

The transformer changes;

Number of secondary windings divided primary windings

The turns ratio is defined as;

Magnetic field

Transformers have iron cores to intensify the;

Closed core

What is the transformer that looks like a square donut called?

Secondary voltage is greater than the primary voltage

When a step-up transformer is in use:

Inversely proportional to the turns ratio

When a transformer is designed the change in current is;

Is/Ip=Np/Ns

Which of the following accurately represents the transformer law?

Shell type

Which of the following is a transformer design used in x-ray imaging systems?

Laminated transformer cores are more efficient than unlaminated ones

Which of the following statements about transformers is correct?