6. Transformers & Rectification

Question 1

This device is capable of storing an electrical charge, or in other words, this device is a temporary storage device.

Capacitor
Transformer
Autotransformer
Rectifier

Answer 1

Capacitor

Question 2

Transformers are composed of two coils placed near each other and the two coils have no physical contact. What is the term for the transformer coil in which current is induced?

Hysteresis
Rectifier
Secondary coil
Primary coil

Answer 2

Secondary coil

Question 3

The autotransformer:

Varies the incoming voltage to an appropriate level for the high-voltage step up transformer.

Is located on the control console side of the x-ray circuit.

Allows the radiographer to make changes in kVp.

All of these are correct

Answer 3

All of these are correct

Question 4

This type of rectifier, containing both n type and p type semiconductor material, is the most commonly used in modern x-ray machinery.

Rheostat
Diode (valve tube)
Diode (solid-state made from silicon)
Capacitor

Answer 4

Diode (solid-state made from silicon)

Question 5

This device is responsible for providing variable voltage to the primary coils of the step up transformer and it allows the technologist to control kVp.

Autotransformer
Diode
Capacitor
Rectifier

Answer 5

Autotransformer

Question 6

The transformer coil that is supplied with alternating current (NOT the transformer coil in which current is induced) is referred to as the:

Secondary coil
Capacitor
Rectifier
Primary coil

Answer 6

Primary coil

Question 7

The current in the secondary coil of the step up transformer will:

Disappear when compared to the current in the primary of the step up transformer

Stay the same when compared to the current in the primary of the step up transformer

Increase when compared to the current in the primary of the step up transformer

Decrease when compared to the current in the primary of the step up transformer

Answer 7

Decrease when compared to the current in the primary of the step up transformer

Question 8

With this type of rectification, the positive half-cycle of the AC waveform is transmitted through the x-ray tube, whereas the negative half-cycle of the AC waveform is suppressed, resulting in only half of the AC waveform being used to produce x-rays.

Full-wave rectification (Single-phase 2 Pulse)
Half-wave rectification (Single-phase 1 Pulse)
All of these
None of these

Answer 8

Half-wave rectification (Single-phase 1 Pulse)

Question 9

Rectification can be described as:

Direct current (DC) is changed to alternating current (AC)
Alternating current (AC) is changed to direct current (DC)
Alternating current (AC) is randomly eliminated
Direct current (DC) is smoothed out to decrease voltage ripple

Answer 9

Alternating current (AC) is changed to direct current (DC)

Question 10

If the primary coil of a transformer is supplied with 110 Volts and has 1000 turns and the secondary coil has 500 turns, what is the voltage induced in the secondary coil?

55 Volts
35.6 Volts
100 Volts
23 Volts

Answer 10

55 Volts

Question 11

This step down transformer adjusts the voltage and current to the cathode of the x-ray tube.

Filament transformer
Rectifier transformer
Autotransformer
Capacitor

Answer 11

Filament transformer

Question 12

With the x-ray tube filament needing around 5-15 Volts and 3-5 Amps to produce thermionic emmisision, the filament transformer is a:

Capacitor
Step up transformer
Step even transformer
Step down transformer

Answer 12

Step down transformer

Question 13

If a high voltage transformer has 400 primary turns and 100,000 secondary turns and the primary is supplied with 220 Volts and 100 Amps, what is the current in the secondary coil if the voltage is stepped up to 55,000 Volts?

400 mA
100 mA
300 mA
200 mA

Answer 13

400 mA

Question 14

This device works using mutual induction.

Autotransformer
Rectifier
Capacitor
Transformer

Answer 14

Transformer

Question 15

As the voltage is stepped up, or increased in the secondary coil of the step up transformer, the current:

Increases in the secondary coil of the step up transformer

Decreases in the secondary coil of the step up transformer

Stays the same in the secondary coil of the step up transformer

Disappears in the secondary coil of the step up transformer

Answer 15

Decreases in the secondary coil of the step up transformer

Question 16

In radiography, when the voltage is increased from the primary of the transformer to kilovolts on the secondary of the transformer, what type of transformer is this?

Rectifier
Step down transformer
Step up transformer
Capacitor

Answer 16

Step up transformer

Question 17

When a transformer has more turns, or loops on the primary coil when compared to the secondary coil, what type of transformer is this?

Step up transformer
Capacitor
Step down transformer
Autotransformer

Answer 17

Step down transformer

Question 18

The type of rectification system that contains at least 4 diodes in the high-voltage circuit, and that rectifies the entire AC waveform is:

Full-wave rectification (Single-phase 2 Pulse)
Self-rectification
Half-wave rectification (Single-phase 1 Pulse)
Direct current (DC)

Answer 18

Full-wave rectification (Single-phase 2 Pulse)