2A672 Pre-test Edit Code 06

126 Questions | Total Attempts: 456

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2A672 Pre-test Edit Code 06

Questions and Answers
  • 1. 
    (001) What is the simplest form of matter?    
    • A. 

      Element

    • B. 

      Mixture

    • C. 

      Electrons

    • D. 

      Compund

  • 2. 
    (001) In an atom, what electrons contain the most energy?    
    • A. 

      The energy is shared equally by all electrons

    • B. 

      Orbiting electrons

    • C. 

      Valence electrons

    • D. 

      K shell electrons

  • 3. 
    (001) If there are eight electrons in the outer most shell of an atom, then it is considered    
    • A. 

      Complete

    • B. 

      Unstable

    • C. 

      Charged

    • D. 

      Stable

  • 4. 
    (001) Atoms having more than four electrons, but less than eight are known as    
    • A. 

      Insulators

    • B. 

      Conductors

    • C. 

      Stable atoms

    • D. 

      Semiconductors

  • 5. 
    (001) The electrostatic fields around a positive ion move    
    • A. 

      Inward

    • B. 

      Outward

    • C. 

      Inward, then outward

    • D. 

      Outward, then inward

  • 6. 
    (001) The force required to move free electrons through a conductor is known as    
    • A. 

      Current

    • B. 

      Voltage

    • C. 

      Negative charge

    • D. 

      Electrostatic force

  • 7. 
    (002) What are factors that affect the resistance of a material?    
    • A. 

      Area, weight, and state of material.

    • B. 

      Area, temperature, and type of material.

    • C. 

      Temperature, weight, and state of material.

    • D. 

      Temperature, type of material, and state of material.

  • 8. 
    (002) What is the resistance in a circuit if the power rating is 40 watts and total current is 2 amps?    
    • A. 

      40 ohms

    • B. 

      20 ohms

    • C. 

      10 ohms

    • D. 

      0.5 ohms

  • 9. 
    002) In a series-parallel circuit, find RT (total resistance) if series resistor R1 = 7 ohms, and parallel resistors R2 and R3 = 8 ohms.
    • A. 

      23 ohms

    • B. 

      15 ohms

    • C. 

      11 ohms

    • D. 

      8 ohms

  • 10. 
    (002) In a series-parallel circuit, the series current at I1 = 9 amps; in the two parallel branches, I2 = 5 amps; and the value of I3 is not listed. Use Ohm’s law to find the value of I3 and IT.
    • A. 

      I3 = 5 amps and IT = 14 amps.

    • B. 

      I3 = 4 amps and IT = 9 amps.

    • C. 

      I3 = 4 amps and IT = 18 amps.

    • D. 

      Not enough information to solve.

  • 11. 
    (002) In a series-parallel circuit, total voltage is 12 volts, the value of E1 in the series portion of the circuit is unknown. There are two parallel branches (E2 = 3 volts) and the value of E3 in the second parallel branch is unknown. Using Ohm’s law, find the value of E1 and E3.
    • A. 

      E3 = 9 volts and E1 = 12 volts.

    • B. 

      E3 = 9 volts and E1 = 3 volts.

    • C. 

      E3 = 3 volts and E1 = 6 volts.

    • D. 

      E3 = 3 volts and E1 = 9 volts.

  • 12. 
    (002) What is the difference between an open and a short?
    • A. 

      An open causes resistance to decrease; a short causes resistance to increase.

    • B. 

      Excessive current flow in an open circuit; no current flow in a shorted component.

    • C. 

      No current flow in an open circuit; excessive current flow in a shorted component.

    • D. 

      Minimum voltage development across the open component; maximum voltage development across the shorted component.

  • 13. 
    (003) When voltage is induced into a conductor by a relative motion between the conductor and a magnetic field this principle is known as
    • A. 

      Magnetism

    • B. 

      Reluctance

    • C. 

      Direct current

    • D. 

      Electromagnetic induction

  • 14. 
    (003) In an inductive circuit, what is meant by current lags voltage by 90 degrees?
    • A. 

      Current is zero when voltage is zero; voltage is maximum when current is maximum.

    • B. 

      Current is maximum when voltage is zero; voltage is maximum when current is zero.

    • C. 

      If current decreases, voltage aids the decrease.

    • D. 

      If current increases, voltage aids the increase.

  • 15. 
    (004) What is the basic principle of operation for transformers?    
    • A. 

      Mutual induction

    • B. 

      Magnetic induction

    • C. 

      Counterelectromotive force

    • D. 

      Primary and secondary induction

  • 16. 
    (004) What transformer winding acts as a conductor and provides the path into which the voltage is induced? 
    • A. 

      Field

    • B. 

      Primary

    • C. 

      Secondary

    • D. 

      Stationary

  • 17. 
    (005) If the size of the plates of a capacitor is increased, how is capacitance affected?    
    • A. 

      Capacitance increases.

    • B. 

      Capacitance decreases.

    • C. 

      Electrons are distorted and scattered.

    • D. 

      Electrostatic force between the plates decreases.

  • 18. 
    (005) What statement best describes a capacitive circuit?
    • A. 

      Current leads applied voltage by 90 degrees.

    • B. 

      Applied voltage leads current by 90 degrees.

    • C. 

      Has the ability to conduct in one direction and not the other.

    • D. 

      Has the ability to conduct in all directions when gated or discharged.

  • 19. 
    (005) In what type of circuit(s) does a capacitor oppose any change in voltage?    
    • A. 

      Alternating current (AC) and direct current (DC).

    • B. 

      Pulsating DC

    • C. 

      Pure DC

    • D. 

      AC

  • 20. 
    (006) What statement best describes a diode?
    • A. 

      Is a five-terminal device.

    • B. 

      Is a three-terminal device.

    • C. 

      Has the ability to conduct in one direction and not the other.

    • D. 

      Has the ability to conduct in all directions when gated or discharged.

  • 21. 
    (006) What are the minority carriers in P-type material?    
    • A. 

      Holes

    • B. 

      Protons

    • C. 

      Neutrons

    • D. 

      Electrons

  • 22. 
    (007) The area of a semiconductor where P-type material is joined to N-type material is known as    
    • A. 

      Dielectric region.

    • B. 

      Depletion region.

    • C. 

      Depletion field.

    • D. 

      PN region

  • 23. 
    (007) A junction diode has how many PN junction(s)?    
    • A. 

      1

    • B. 

      2

    • C. 

      3

    • D. 

      4

  • 24. 
    (007) If a negative potential is connected to the cathode and a positive potential is connected to the anode of a PN junction, the diode is
    • A. 

      Not allowing current to flow

    • B. 

      Forward biased

    • C. 

      Reverse biased

    • D. 

      Turned on

  • 25. 
    (008) In a circuit using a bridge rectifier, how many diodes are forward biased during the first cycle of alternating current (AC)?
    • A. 

      4

    • B. 

      3

    • C. 

      2

    • D. 

      1

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