Worksheet questions

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

A step-up transformer

Step-down transformer is increasing:

Amps

The principal application of a transformer in an x-ray imaging system is to:

Change voltage

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

Closed-core

The autotransformer has only one:

Coil

A autotransformer:

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

When a transformer is designed, the change in current is:

Inversely proportional to the turns ratio

Which of the following statements about transformers is correct?

Laminated transformer cores are more efficient than unlaminated ones

The output current in a step-up transformer is:

Lower than the input current

Transformers have iron cores to intensify the:

Magnetic field

The turns ratio is defined as:

Number of secondary windings/primary

A transformer operates:

On AC but not on DC

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

Shell type

If one side of transformer has more coils on the primary side than secondary side, what transformer is it?

Step down/Filament circuit

When a step-up transformer is in use:

The secondary voltage is greater than the primary voltage

If a transformer produces a large secondary current from a small primary current:

The turns ratio will be less than 1

A transformer "transforms" or changes electric:

Voltage

Step-up transformer is increasing:

Voltage

Which of the following accurately represents the transformer law?

ls/lp=Np/Ns