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RAD 4100: X-ray Imaging Circuit & Generators Worksheet #1

Total questions: 46

Worksheet time: 23mins

Name
Class
Date
1.

If the primary coil of the x-ray transformer is supplied by 220V and has 2,000 turns, and the secondary coil has 1,000 turns, what would be the induced voltage in the secondary coil?

a)

220 V

b)

110 kV

c)

40 V

d)

110 V

2.

In which of the following portions of the x-ray circuit is the step-down transformer used?

a)

high voltage side

b)

filament circuit

c)

secondary side

d)

rectifier system

3.

A transformer with more turns in its secondary winding than in its primary winding would be expected to ________ voltage.

a)

increase

b)

decrease

c)

step-up

d)

step-down

4.

The x-ray tube can operate only on ______ current.

a)

direct

b)

alternating

5.

A transformer with 300 turns on the primary side and an input voltage of 150 V has 60,000 turns on the secondary side. This is a ______ transformer.

a)

step-down

b)

step-up

6.

An autotransformer functions as a/an ______.

a)

kVp meter

b)

live voltage exposure device

7.

A transformer described in the previous question has a secondary coil with 60,000 turns and a secondary voltage of 12,000 V. What is the input voltage if the primary coil has 300 turns?

a)

200 V

b)

150 V

8.

What type of transformer is being described in the previous question?

a)

step-up

b)

step-down

9.

In the x-ray circuit, would the transformer described above be used for the kVp meter or the x-ray tube?

a)

kVp meter

b)

x-ray tube

10.

To prevent electrical shock, which of the following components of the x-ray circuit is placed between the autotransformer and the step-up transformer?

a)

circuit breaker

b)

rectifier

11.

When the step-down transformer is used in the x-ray circuit, in case of current changes or power surges, which of the following is created?

a)

transformer

b)

rectifier

12.

In the x-ray circuit, is the timer located between the step-down transformer and the x-ray tube, or between the rectifier and the x-ray tube?

a)

between the step-down transformer and the x-ray tube

b)

between the rectifier and the x-ray tube

13.

The voltmeter is located in the x-ray circuit:

a)

before the autotransformer, primary circuit

b)

after the autotransformer, primary circuit

c)

after the autotransformer, primary circuit

d)

at the x-ray tube, secondary circuit

14.

The three main parts of the x-ray imaging system are the x-ray tube, ________, and ________.

a)

protective housing, console

b)

console, high-voltage generator

c)

rectifier assembly, console

15.

The operating console contains circuits that are ________.

a)

high voltage only

b)

low voltage only

c)

both high and low voltage

16.

Variations in power distribution to the x-ray machine are corrected by the ________.

a)

autotransformer

b)

rectifier

c)

filament transformer

17.

Thermionic emission at the filament determines the voltage across the x-ray tube.

a)

kVp

b)

mA

c)

resistance

d)

filament current

18.

The step-down transformer is located in the

a)

high-voltage circuit

b)

filament circuit

c)

timer circuit

d)

rectifier circuit

19.

The most accurate type of timer is the

a)

synchronous

b)

mAs

c)

electronic

d)

mechanical

20.

The automatic exposure control (AEC) terminates the exposure when a.

a)

the radiologist releases the exposure switch

b)

sufficient radiation is received

c)

the x-ray tube filament is heated

d)

the timer reaches zero

21.

The AEC detector is located

a)

between the patient and the image receptor

b)

between the x-ray tube and the patient

c)

in the control panel

d)

in the high-voltage generator

22.

The mAs timer is usually set to give the

a)

lowest mA at the longest time

b)

highest mA at the shortest time

c)

lowest mA at the shortest time

d)

highest mA at the longest time

23.

The step-up transformer increases voltage

a)

10 times

b)

200-1200 times

c)

500-1000 times

d)

20-50 times

24.

A diode allows electrons to flow

a)

from cathode to anode

b)

from anode to cathode

c)

from anode to anode

d)

from cathode to cathode

25.

The high-voltage generator contains the high voltage transformer, the ______ transformer, and the rectifiers.

a)

autotransformer

b)

filament transformer

c)

step-up transformer

26.

The difference in the waveform between the primary and secondary sides of the high voltage transformer is ______.

a)

frequency

b)

amplitude

c)

voltage

27.

In modern imaging systems, the components for rectification are ______.

a)

diodes

b)

transformers

c)

generators

28.

With half-wave rectification the current flows through the x-ray tube during the ______ half of the cycle.

a)

positive

b)

negative

c)

full

29.

With half-wave rectification, the x-ray beam at the x-ray tube contains ______ pulses per second.

a)

60 pulses

b)

120 pulses

c)

360 pulses

30.

With full-wave rectification, the x-ray beam at the x-ray tube contains ______ pulses per second.

a)

60 pulses

b)

120 pulses

c)

360 pulses

31.

With full-wave rectification, the current flows through the x-ray tube during the ______ half of the cycle.

a)

positive

b)

negative

c)

both

32.

Fully rectified, three-phase units provide an x-ray beam at ______ pulses per second.

a)

60 pulses

b)

120 pulses

c)

360 pulses

33.

Voltage across the x-ray tube is most constant with ______ generators.

a)

single-phase, half-wave rectification

b)

single-phase, full-wave rectification

c)

three-phase, full-wave rectification

34.

Most mammography units operate with ______ generators.

a)

single-phase

b)

three-phase

c)

high-frequency

35.

A single-phase waveform has the ________ voltage ripple.

a)

14%

b)

4%

c)

100%

d)

1%

36.

The x-ray beam generated by the circuit with the ________ quality.

a)

highest, highest

b)

lowest, lowest

c)

highest, lowest

d)

lowest, highest

37.

The principal disadvantage of three-phase equipment is ________.

a)

correction

b)

term quality

c)

cost

d)

efficiency

38.

What is the industry standard formula for calculating high voltage generator power?

a)

Power = min mA (@100 kVP and 100 ms) × 100 kVP

b)

Power = max mA (@100 kVP and 100 ms) × 100 kVP

c)

Power = min mA (@100 kVP and 100 ms) × 100 kVP

d)

Power = max mA (@100 kVP and 100 ms) × 100 kVP

39.

The x-ray generator with the lowest power rating is the ________ imaging system.

a)

three-phase, 12-pulse

b)

three-phase, 6-pulse

c)

single-phase

d)

High frequency

40.

19?

a)

Autotransformer

b)

Exposure time

c)

Rectifier

d)

X-ray tube

41.

20?

a)

Autotransformer

b)

Exposure timer

c)

X-ray tube

d)

Filament circuit (step down)

42.

21

a)

Exposure timer

b)

Rectifier

c)

X-ray tube

d)

High voltage transformer

43.

22

a)

Rectifier

b)

X-ray tube

c)

Autotransformer

d)

High voltage transformer

44.

23

a)

Rectifier

b)

X-ray tube

c)

High voltage transformer

d)

Autotransformer

45.

24

a)

Filament circuit (step down)

b)

Rectifier

c)

X-ray tube

d)

Exposure timer

46.

For the X-ray circuit in which component of the circuit is the voltage decreased and the current increased?

a)

Step up transformer (High voltage transformer)

b)

Step down transformer (filament circuit)

c)

Rectifier

d)

Autotransformer