Question

CHAPTER 4 The X-ray Circuit 49 xposure (like a timer) monly used tod REVIEW QUESTIONS-cont'd that is placed betwee rs in the chamber, a are arranged to DC. This pr hase waveforms, A rheostat will: a. provide electric potential b. vary resistance. c. increase or decrease voltage. d. provide infinite resistance. In a metallic conductor: a. electrons move on external surface. b. electrons move internally c. protons move on external surface. d. protons move internally Nearly all discussion of electricity deals with the move- ment of a. positive charges. b. negative charges. c. neutrons. d. all of the above. 10. Which of the following allows electrons to flow in only s the radiation one direction? mber, ionization occu exits th b, rheostat c. battery d. diode 11. Which of the following is a unit of measure of current a. ampere b. volt c. Coulomb d. ohm the same way each ti This process 12. Magnetic flux is a. magnetic material. b. groups of smaller magnets. c. curved lines of force in space. ntage of ripple in the d. the magnetizing of other materials use of high-frequ rther still. attracted to magnets? . Which of the following conditions or environments will 13. What is the magnetic classification of milliamperage on the justing this rheostat, provide the least resistance? a. glass material b. long conductor c. large cross-sectional area d. high temperature of conductor b. ferromagnetic c. paramagnetic d. no such classification the filament ci a. A applied to the filan mA station number, 1 ampere in a circuit with a resistance of 1 ohm is the definition of a. ampere b. volt. 8. The potential difference that will maintain a current of 14. The unit of measure for electric potential is c.Ω d. W ough the primary a the autotransform c. ohm. d. coulomb. the rectifiers, to t f events through t 9. The removal of electrons from an object by rubbing it with another is electrification by: he autotransform n transformer, a hode of the x a. contact. b. friction. c. induction d. grounding. n simultaneous be that produce

Answer 1

Vary resistance electrons move on external surface Negative charges large cross - sectional area R = rho l/A volt [V = IR] Induction battery Ampere curved lines of force in space paramagnetic V