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Physics
Physics test 1
| Question | Answer |
|---|---|
| T or F? Overhead suspension systems include two sets of rails for controlling longitudinal and transverse positioning and a telescoping column for controlling vertical distance. | True |
| T or F? The exposure switch is designed to begin and end the x-ray exposure | False |
| T or F? Automatic exposure controls are programmed to terminate the radiographic exposure current | true |
| The voltage ripple of a single-phase fully rectified generator is: | 100% |
| Diagnostic units operate within the diagnostic x-ray range of: | 10-1200 mAs ; .001 to 10 seconds; 25-150 kVp |
| T or F? The purpose of the filament circuit is to create the thermoinic cloud of electrons at the filament. | True |
| Which type of generator begins exposures at the highest possible mA to permit reduced exposure time? | High mA potential |
| T or F? There are actually two different types of automatic exposure controls: photo timers and ionization chambers | True |
| All of the following are types of tube supports, except: | Wall-to-floor |
| T or F? Electricity is usually supplied to buildings in the united states by 60 Hz direct current? | False (alternating current) |
| T or F? the purpose of the main circuit is to produce x-rays. | True |
| T or F? The filament circuit consists of a step-up transformer. | False |
| The rotor switch control in an x-ray circuit does the following: | Speeds up the rotating anode |
| T or F? there are two types of automatic exposure controls | True |
| T or F? Head units consist of an x-ray tube, Bucky tray and table | False, no table |
| What is described as the length of time necessary for the AEC to respond to the radiation and for the generator to terminate the exposure? | Minimum reaction time |
| The ionization chamber is placed between the ______ and the ______. | Patient and Film |
| The incoming line current is supplied in the form of a ______ power cycle. | Three-phase |
| T or F? All automatic exposure controls are equipped with an electronic interlocks that requires a manual backup time to be set. | True |
| What timer is the most common timer in use today? | Milliampere-Second |
| A difference between self-induction and mutual induction is that: | Mutual induction requires two coils and self-induction requires only one coil |
| In an induction motor, the only part to be rotated is the ____? | Rotor |
| An alternately expanding and contracting magnetic field is produced by____? A. stationary motor B. battery C. steady current flowing in a wire D. none of the above | D. none of the above |
| T or F? Solenoids and the electromagnets demonstrate magnetic properties only while electric current is flowing | True |
| T or F? no matter how much a magnet is divided, both poles continue to exist | True |
| T or F? Any charged particle in motion creates a magnetic field | True |
| T or F? The best example of a permanent magnet is the earth itself | True |
| T or F? a moving electrical field produces a magnetic field | True |
| T or F? Induction is the process of electric fields acting on one another with contact | False |
| 1 Tesla =________Gause | 10,000 |
| The process by which alternating current is changed to pulsating direct current is termed_______. | rectification |
| A transformer with more turns on the secondary side compared to the primary side is referred to as a ______. | Step-up transformer |
| T or F? Unlike charges attract, like charges repel. | True |
| T or F? a generator is a device that inverts electrical energy into mechanical energy | False |
| T or F? temporary magnets (electromagnets) are produced by a moving electrical current | True |
| T or F? An overhead suspension system includes two sets of rails for controlling longitudinal and transverse positioning and a telescoping column for controlling vertical distance | True |
| T or F? chest radiography should routinely be done in an upright position | True |
| Electromagnetic waves are unique in that no _______ is required for transmission | Medium |
| Electricity is usually supplied to buildings in the United States and Canada by ______Hz alternating current with ______voltz | 60Hz; 220-240 volts |
| T or F? Alternating current supplied to buildings is called the incoming line current and is supplied in the form of a single-phase power cycle | False, three-phase |
| T or F? For 3-phase power, the sum of the phasing drops to zero 6o times per cycle | False, it never drops to zero |
| T or F? all exposure switches must be of the 'dead man' type in which x-ray exposures may occur only while the switch is depressed | True |
| T or F? single phase generators with full wave rectification produces a voltage ripple of 50% | False, 100% ripple |
| T or F? a full wave rectified, three-phase, twelve pulse waveform produces approximately 41% more photon energy than full-wave single phase | True |
| T or F? Automatic exposure controls are programmed to terminate the radiographic exposure current | true |
| T or F? All automatic exposure controls are equipped with an electronic interlocks that requires a manual backup time to be set | true |
| The cathode is the _____ side of the x-ray tube | Negative |
| T or F? there are two types of cathodes: rotating and stationary | False- anode has 2 types |
| T orF? the line focus principle is used to reduce the effective area of the focal spot | true |
| known as the anode heel effect, the radiation intensity is greater on the ________ side | Cathode |
| The entire cathode and anode assembly, except the _______, is included in the glass envelope of the x-ray tube | Stator |
| Leakage radiation must not exceed: | 100 mR/hr at 1 meter |
| What is the anode material of choice for a general x-ray tube? | Tungsten |
| T or F? the actual focal spot is the actual area of the focal track that is impacted by electrons (on the anode) | True |
| What is one of the reasons that tungsten is the metal of choice for the general x-ray tube? | 1- high Z 2- High melting point 3- heat conducting ability |
| T or F? the anode heel effect is best visualized when large film sizes are used at short distances | true |
| T or F? Flouroscopic imaging typically uses 3 detectors for AEC. | False, one radiograph typically uses 3 |
| What type of radiation is produced at a location other than the focal spot? | off-focus |
| T or F? X-ray photons are produced when the high-speed electrons from the anode strike a cathode target | False- high speed electrons from the CATHODe to the ANODE |
| T or F? when incident electrons strike the target, they convert their kinetic energy to the atoms of the target material | true |
| t or f? after giving up their energy to the target atoms, the electrons slow down enough to be conducted through the anode and the remainder of the high-voltage circuit | true |
| t or f? incident electrons will experience only one interaction before slowing down enough to be conducted through the anode | False, typically over 1,000 interactions |
| T or F? Over 99% of the kinetic energy of the incident electrons is converted to x-ray photons | flase, heat |
| T or F? As kinetic energy of the electrons increases, so does the efficiency of photon production | true |
| T or F? the energy of Bremsstrahlung photons is exactly the difference between the entering and exiting kinetic energy of the electron | true |
| which interaction occurs when the incident electron interacts with an inner-shell electron: Bremsstrahlung or Characteristic? | Characteristic |
| True of False? A generator is a device that converts electrical energy into mechanical energy | False, thats a motor |
| T or F? Mutual induction occurs when two coils are placed in proximity and a varying current is supplied to the first coil | true |
| T or F? 1 Tesla= 10,000 Gauss | true |
| T or F? temporary magnets are produced by a moving electrical current | true |
| T or F? rectification is the process by which AC is changed to DC | true |
| A device capable of accumulating and storing an electric charge is: | a capacitor |
| T or F? a molecule is the smallest particle of an element that still possesses the chemical properties of that element | False |
| T or F? X-rays originate from the nucleus of radioactive materials | false |
| T or F? x-rays travel only in straight lines | true |
| T or F? the nucleus of an atom is positively charged | True |
| what is the law of conservation of energy? | Energy cannot be created or destroyed, only converted (heat) |
| Atomic number is the number of? | protons in the nucleus |
| what year were X-rays discovered? | 1895 |
| what are two types of mechanical energy? | Potential, kinetic |
| electromagnetic energy consists of alternating ________ and ________ fields? | electric, magnetic |
| electromagnetic radiation can be characterized either as a __________ or a _________ | wave; particle |
| which of the following types of electromagnetic radiation has the longest wavelength? A: X-rays B: visible light C: ultraviolet D: radio waves | D. radio waves |
| electromagnetic energy travels through spar in the form of: | a wave |
| frequency and wavelength are _________ proportional | inversely |
| T or F? all X-ray photons have the same energy | false; xray photons are polyenergetic |
| T or F? mass is energy and energy is mass | true |
| What is the unit of electric potential? | volt |
| T or F? Ohm's law is given by P=IV | False |
| T or F? the waveform for AC is a sine wave | true |
| what is the equation can be used to calculate electric power consumption? | P=IV |
| the unit of electrical power is _____. | watt |
| the unit of current is _____. | ampere |
| converts mechanical energy to electrical energy | generator |
Created by:
taylos84
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