Electrical Iti Instructor Online Test 1

90 Questions | Total Attempts: 143

SettingsSettingsSettings
Electrical Iti Instructor Online Test 1 - Quiz


Questions and Answers
  • 1. 
    A resistor is connected across a 50 V source. What is the current in the resistor if the color code is red, orange, orange, silver?
    • A. 

      2 mA

    • B. 

      2.2 mA

    • C. 

      214 mA

    • D. 

      21.4 mA

  • 2. 
    How much voltage is needed to produce 2.5 A of current through a 200  resistor?
    • A. 

      50 V

    • B. 

      500 V

    • C. 

      80 V

    • D. 

      8 V

  • 3. 
    Twelve volts are applied across a resistor. A current of 3 mA is measured. What is the value of the resistor?
    • A. 

    • B. 

      400 

    • C. 

      4 k

    • D. 

      4.4 

  • 4. 
    When a fourth resistor is connected in series with three resistors, the total resistance
    • A. 

      Increases by one-fourth

    • B. 

      Increases

    • C. 

      Decreases

    • D. 

      Remains the same

  • 5. 
    The total power in a certain circuit is 12 W. Each of the four equal-value series resistors making up the circuit dissipates
    • A. 

      12 W

    • B. 

      48 W

    • C. 

      3 W

    • D. 

      8 W

  • 6. 
    Three 680  resistors are connected in series with a 470 V source. Current in the circuit is
    • A. 

      69 mA

    • B. 

      230 mA

    • C. 

      23 mA

    • D. 

      690 mA

  • 7. 
    If a 6 V and a 9 V source are connected series aiding, the total voltage is
    • A. 

      6 V

    • B. 

      8 V

    • C. 

      3 V

    • D. 

      15 V

  • 8. 
    A certain Wheatstone bridge has the following resistor values: R1 = 10 k, R2 = 720 , and R4 = 2.4 k. The unknown resistance is
    • A. 

      24 

    • B. 

      2.4 

    • C. 

      300 

    • D. 

      3,000 

  • 9. 
    The branch current method uses
    • A. 

      Kirchhoff's voltage and current laws

    • B. 

      Thevenin's theorem and Ohm's law

    • C. 

      Kirchhoff's current law and Ohm's law

    • D. 

      The superposition theorem and Thevenin's theorem

  • 10. 
    How many degrees are there in /3 rad?
    • A. 

    • B. 

      60°

    • C. 

      180°

    • D. 

      270

  • 11. 
    To produce an 800 Hz sine wave, a four-pole generator must be operated at
    • A. 

      200 rps

    • B. 

      400 rps

    • C. 

      800 rps

    • D. 

      1,600 rps

  • 12. 
    If the peak of a sine wave is 13 V, the peak-to-peak value is
    • A. 

      6.5 V

    • B. 

      13 V

    • C. 

      26 V

    • D. 

      None of the above

  • 13. 
    A signal with a 400 s period has a frequency of
    • A. 

      250 Hz

    • B. 

      2,500 Hz

    • C. 

      25,000 Hz

    • D. 

      400 Hz

  • 14. 
    A sawtooth wave has a period of 10 ms. Its frequency is
    • A. 

      10 Hz

    • B. 

      50 Hz

    • C. 

      100 Hz

    • D. 

      1000 Hz

  • 15. 
    A 2 mH, a 3.3 mH, and a 0.2 mH inductor are connected in series. The total inductance is
    • A. 

      55 mH

    • B. 

      Less than 0.2 mH

    • C. 

      Less than 5.5 mH

    • D. 

      5.5 mH

  • 16. 
    An ohmmeter is connected across an inductor and the pointer indicates zero ohms. The inductor is
    • A. 

      Good

    • B. 

      Open

    • C. 

      Shorted

    • D. 

      Partly shorted

  • 17. 
    The current through a 120 mH coil is changing at a rate of 150 mA/s. The voltage induced across the coil is
    • A. 

      1.8 mV

    • B. 

      18 mV

    • C. 

      180 mV

    • D. 

      1.25 mV

  • 18. 
    In a three-phase system, the voltages are separated by
    • A. 

      45°

    • B. 

      90°

    • C. 

      120°

    • D. 

      180°

  • 19. 
    In a three-phase system, when the loads are perfectly balanced, the neutral current is
    • A. 

      Zero

    • B. 

      One-third of maximum

    • C. 

      Two-thirds of maximum

    • D. 

      At maximum

  • 20. 
    In a balanced three-phase load, each phase has
    • A. 

      An equal amount of power

    • B. 

      One-third of total power

    • C. 

      Two-thirds of total power

    • D. 

      A power consumption equal to  IL

  • 21. 
    In a Y-connected circuit, between each line voltage and the nearest phase voltage, there is a phase angle of
    • A. 

    • B. 

      30°

    • C. 

      60°

    • D. 

      120°

  • 22. 
    The most common type of ac motor is the
    • A. 

      Single-phase induction motor

    • B. 

      Two-phase induction motor

    • C. 

      Three-phase induction motor

    • D. 

      Two-phase squirrel-cage motor

  • 23. 
    In Delta connected generator, all of the phase voltages are
    • A. 

      Zero

    • B. 

      Equal in magnitude

    • C. 

      One-third of total

    • D. 

      One-sixth of total

  • 24. 
    Materials with lots of free electrons are called
    • A. 

      Conductors

    • B. 

      Insulators

    • C. 

      Semiconductors

    • D. 

      Filters

  • 25. 
    The unit of electrical charge is the
    • A. 

      Coulomb

    • B. 

      Joule

    • C. 

      Volt

    • D. 

      Watt

Back to Top Back to top