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Technician exam T5: Electrical Principles

All 50 questions in subelement T5. The exam asks 4 of them, one from each group (T5A, T5B, T5C, T5D). Answers are hidden until you open them.

Drill these 50 questions Full practice exam

T5A

  1. T5A01 Electrical current is measured in which of the following units?

    1. Volts
    2. Watts
    3. Ohms
    4. Amperes
    Show answer

    D. Amperes

  2. T5A02 Electrical power is measured in which of the following units?

    1. Volts
    2. Watts
    3. Watt-hours
    4. Amperes
    Show answer

    B. Watts

  3. T5A03 What is the term for the flow of electrons in an electric circuit?

    1. Voltage
    2. Amperes per second
    3. Volts per second
    4. Current
    Show answer

    D. Current

  4. T5A04 What term describes the number of times per second that an alternating current makes a complete cycle?

    1. Pulse rate
    2. Wave number
    3. Frequency
    4. Wavelength
    Show answer

    C. Frequency

  5. T5A05 A difference in which of the following causes electron flow?

    1. Voltage
    2. Ampere-hours
    3. Capacitance
    4. Inductance
    Show answer

    A. Voltage

  6. T5A06 What is the unit of frequency?

    1. Hertz
    2. Henry
    3. Farad
    4. Epicycles per second
    Show answer

    A. Hertz

  7. T5A07 Why are metals generally good conductors of electricity?

    1. They have relatively high density
    2. They have many free electrons
    3. They have many free protons
    4. They have relatively high Young’s modulus values
    Show answer

    B. They have many free electrons

  8. T5A08 Which of the following is a good electrical insulator?

    1. Sea water
    2. Glass
    3. Stainless steel
    4. Graphite
    Show answer

    B. Glass

  9. T5A09 Which of the following describes alternating current?

    1. Current that alternates between a positive direction and zero
    2. Current that alternates between a negative direction and zero
    3. Current that alternates between positive and negative directions
    4. All these answers are correct
    Show answer

    C. Current that alternates between positive and negative directions

  10. T5A10 Which term describes the rate at which electrical energy is used?

    1. Resistance
    2. Current
    3. Power
    4. Voltage
    Show answer

    C. Power

  11. T5A11 What type of current flow is opposed by resistance?

    1. Direct current
    2. Alternating current
    3. RF current
    4. All these choices are correct
    Show answer

    D. All these choices are correct

T5B

  1. T5B01 How many milliamperes is 1.5 amperes?

    1. 0.0000015 milliamperes
    2. 0.0015 milliamperes
    3. 1500 milliamperes
    4. 1,500,000 milliamperes
    Show answer

    C. 1500 milliamperes

  2. T5B02 Which is equal to 1,500,000 hertz?

    1. 1500 kHz
    2. 1500 MHz
    3. 15 GHz
    4. 150 kHz
    Show answer

    A. 1500 kHz

  3. T5B03 Which is equal to one kilovolt?

    1. One one-thousandth of a volt
    2. One hundred volts
    3. One thousand volts
    4. One million volts
    Show answer

    C. One thousand volts

  4. T5B04 Which is equal to one microvolt?

    1. One one-millionth of a volt
    2. One million volts
    3. One thousand kilovolts
    4. One one-thousandth of a volt
    Show answer

    A. One one-millionth of a volt

  5. T5B05 Which is equal to 500 milliwatts?

    1. 5 watts
    2. 0.5 watts
    3. 500,000 watts
    4. 500,000,000 watts
    Show answer

    B. 0.5 watts

  6. T5B06 Which is equal to 3000 milliamperes?

    1. 0.003 amperes
    2. 0.3 amperes
    3. 3,000,000 amperes
    4. 3 amperes
    Show answer

    D. 3 amperes

  7. T5B07 Which is equal to 3.525 MHz?

    1. 0.003525 kHz
    2. 35.25 kHz
    3. 3525 kHz
    4. 3,525,000 kHz
    Show answer

    C. 3525 kHz

  8. T5B08 Which is equal to 1,000,000 picofarads?

    1. 0.001 microfarads
    2. 1 microfarad
    3. 1000 microfarads
    4. 1,000,000,000 microfarads
    Show answer

    B. 1 microfarad

  9. T5B09 Which decibel value most closely represents a power increase from 5 watts to 10 watts?

    1. 2 dB
    2. 3 dB
    3. 5 dB
    4. 10 dB
    Show answer

    B. 3 dB

  10. T5B10 Which decibel value most closely represents a power decrease from 12 watts to 3 watts?

    1. -1 dB
    2. -3 dB
    3. -6 dB
    4. -9 dB
    Show answer

    C. -6 dB

  11. T5B11 Which decibel value represents a power increase from 20 watts to 200 watts?

    1. 10 dB
    2. 12 dB
    3. 18 dB
    4. 28 dB
    Show answer

    A. 10 dB

  12. T5B12 Which is equal to 28400 kHz?

    1. 28.400 kHz
    2. 2.800 MHz
    3. 284.00 MHz
    4. 28.400 MHz
    Show answer

    D. 28.400 MHz

  13. T5B13 Which is equal to 2425 MHz?

    1. 0.002425 GHz
    2. 24.25 GHz
    3. 2.425 GHz
    4. 242.5 GHz
    Show answer

    C. 2.425 GHz

T5C

  1. T5C01 What describes the ability to store energy in an electric field?

    1. Inductance
    2. Resistance
    3. Frequency
    4. Capacitance
    Show answer

    D. Capacitance

  2. T5C02 What is the unit of capacitance?

    1. Farad
    2. Ohm
    3. Volt
    4. Henry
    Show answer

    A. Farad

  3. T5C03 What describes the ability to store energy in a magnetic field?

    1. Admittance
    2. Capacitance
    3. Resistance
    4. Inductance
    Show answer

    D. Inductance

  4. T5C04 What is the unit of inductance?

    1. Coulomb
    2. Farad
    3. Henry
    4. Ohm
    Show answer

    C. Henry

  5. T5C05 What is the unit of impedance?

    1. Volt
    2. Ampere
    3. Coulomb
    4. Ohm
    Show answer

    D. Ohm

  6. T5C06 What is the abbreviation for kilohertz?

    1. kHz
    2. khz
    3. KHz
    4. KHZ
    Show answer

    A. kHz

  7. T5C07 What is the abbreviation for megahertz?

    1. mHz
    2. mHZ
    3. Mhz
    4. MHz
    Show answer

    D. MHz

  8. T5C08 What formula is used to calculate electrical power (P) in a DC circuit?

    1. P = I x E
    2. P = E / I
    3. P = I2 x E
    4. P = I / E
    Show answer

    A. P = I x E

  9. T5C09 How much power is delivered by a voltage of 13.8 volts DC and a current of 10 amperes?

    1. 138 watts
    2. 0.7 watts
    3. 23.8 watts
    4. 3.8 watts
    Show answer

    A. 138 watts

  10. T5C10 How much power is delivered by a voltage of 12 volts DC and a current of 2.5 amperes?

    1. 4.8 watts
    2. 30 watts
    3. 14.5 watts
    4. 0.208 watts
    Show answer

    B. 30 watts

  11. T5C11 How much current is required to deliver 120 watts at a voltage of 12 volts DC?

    1. 0.1 amperes
    2. 10 amperes
    3. 12 amperes
    4. 132 amperes
    Show answer

    B. 10 amperes

  12. T5C12 What is impedance?

    1. The opposition to AC current flow
    2. The inverse of resistance
    3. The inverse of reactance
    4. The power handling capability of a component
    Show answer

    A. The opposition to AC current flow

T5D

  1. T5D01 What formula is used to calculate current in a circuit?

    1. I = E x R
    2. I = E / R
    3. I = E2 x R
    4. I = E2 / R
    Show answer

    B. I = E / R

  2. T5D02 What formula is used to calculate voltage in a circuit?

    1. E = I x R
    2. E = I / R
    3. E = I2 x R
    4. E = I2 / R
    Show answer

    A. E = I x R

  3. T5D03 What formula is used to calculate resistance in a circuit?

    1. R = E x I
    2. R = E / I
    3. R = E + I
    4. R = E - I
    Show answer

    B. R = E / I

  4. T5D04 What is the resistance of a circuit in which a current of 3 amperes flows when connected to 90 volts?

    1. 3 ohms
    2. 30 ohms
    3. 1/30 ohm
    4. 270 ohms
    Show answer

    B. 30 ohms

  5. T5D05 What is the resistance of a circuit for which the applied voltage is 12 volts and the current flow is 1.5 amperes?

    1. 18 ohms
    2. 0.125 ohms
    3. 8 ohms
    4. 13.5 ohms
    Show answer

    C. 8 ohms

  6. T5D06 What is the resistance of a circuit that draws 4 amperes from a 12-volt source?

    1. 3 ohms
    2. 16 ohms
    3. 48 ohms
    4. 8 ohms
    Show answer

    A. 3 ohms

  7. T5D07 What is the current in a circuit with an applied voltage of 120 volts and a resistance of 80 ohms?

    1. 9600 amperes
    2. 200 amperes
    3. 0.667 amperes
    4. 1.5 amperes
    Show answer

    D. 1.5 amperes

  8. T5D08 What is the current through a 100-ohm resistor connected across 200 volts?

    1. 20,000 amperes
    2. 0.5 amperes
    3. 2 amperes
    4. 100 amperes
    Show answer

    C. 2 amperes

  9. T5D09 What is the current through a 24-ohm resistor connected across 240 volts?

    1. 2400 amperes
    2. 0.1 amperes
    3. 10 amperes
    4. 5760 amperes
    Show answer

    C. 10 amperes

  10. T5D10 What is the voltage across a 2-ohm resistor if a current of 0.5 amperes flows through it?

    1. 1 volt
    2. 0.25 volts
    3. 2.5 volts
    4. 1.5 volts
    Show answer

    A. 1 volt

  11. T5D11 What is the voltage across a 10-ohm resistor if a current of 1 ampere flows through it?

    1. 1 volt
    2. 10 volts
    3. 11 volts
    4. 9 volts
    Show answer

    B. 10 volts

  12. T5D12 What is the voltage across a 10-ohm resistor if a current of 2 amperes flows through it?

    1. 8 volts
    2. 0.2 volts
    3. 12 volts
    4. 20 volts
    Show answer

    D. 20 volts

  13. T5D13 In which type of circuit is the current always the same through all components?

    1. Series
    2. Parallel
    3. Resonant
    4. Branch
    Show answer

    A. Series

  14. T5D14 In which type of circuit is the voltage always the same across all components?

    1. Series
    2. Parallel
    3. Resonant
    4. Branch
    Show answer

    B. Parallel

Questions: NCVEC Question Pool Committee (public domain). Pool valid July 1, 2026 – June 30, 2030.