ATO - Test 3 ( AC ) Exam |Questions and
Answers
AC Advantages - -- Can be stepped up or stepped down using a transformer
- Can be transmitted at high voltage , low current which reduces power losee
- Wave - -A physical activity that rises and falls periodically
- Waveform - -graphic representation of a sound that occurs over a period
of time
- AC waveform - -A plot of a current or voltage which constantly changes in
amplitude and direction
- 3 things required to produce an AC wave - -- Magnetic Field
- Conductor
- Relative Motion
- Speed of the generator - -The speed of the generator is directly
proportional to the speed of the wave
- Period - -The length of time to complete a cycle
- Frequency - -How many cycles in 1 second
- Frequency measured in - -Measured in Hz
- Period measured in - -Time
- Period / Frequency - -- As period increases , frequency decreases
- Magnetism - -An invisible force that pushes or pulls magnetic materials.
- Classified as Permanent or Temporary
- magnetic field - -The area of magnetic force around a magnet
- Electromagnetism - -When current flows through a conductor , it creates a
magnetic field around the conductor
- Field Strength depends on - -- Number of turns of the conductor in the coil
- Amount of current flow through the coup
- Type of core material
, - Left Hand Rule - -Thumb points in direction of current flow
- As your Polarity changes - -So does your direction of current
- Convert AC to DC - -RMS converts AC to DC
- Vrms = 0.707 x Vpk
- Vavg = 0.637 x Vpk
- 3 Characteristics Needed For Sine Wave Calculations - -- Frequency
- Period
- Wavelength
- Period Symbol - -T ( Time )
- Harmonics - -- Fundamental Frequency
- Harmonic Frequency
Ex - 60 Hz
2nd Harmonic is 120 Hz
Subharmonic is division
- Sinusoidal and Non - Sinusoidal Waveforms - -- Non - Sinusoidal Waves
result from harmonic frequencies being allowed to combine with a
fundamental and only harmonics
- Triangle vs Sawtooth - -Triangle - Even rise and fall
Sawtooth - Uneven rise and fall
- Is a function generator test equipment - -A function generator is not test
equipment
- Peak vs peak to peak - -Peak is Half the wave
Peak to peak is the entire wave
- Inductance opposes change in what - -Opposes change in current
- Inductor measured in - -Measured in Henrys
- Electromagnetic induction - -the process of creating a current in a circuit
by changing a magnetic field
- In an AC circuit that contains only inductance , there are three varying
quantities - -- Applied Voltage
- Induced EMF
- Circuit Current
Answers
AC Advantages - -- Can be stepped up or stepped down using a transformer
- Can be transmitted at high voltage , low current which reduces power losee
- Wave - -A physical activity that rises and falls periodically
- Waveform - -graphic representation of a sound that occurs over a period
of time
- AC waveform - -A plot of a current or voltage which constantly changes in
amplitude and direction
- 3 things required to produce an AC wave - -- Magnetic Field
- Conductor
- Relative Motion
- Speed of the generator - -The speed of the generator is directly
proportional to the speed of the wave
- Period - -The length of time to complete a cycle
- Frequency - -How many cycles in 1 second
- Frequency measured in - -Measured in Hz
- Period measured in - -Time
- Period / Frequency - -- As period increases , frequency decreases
- Magnetism - -An invisible force that pushes or pulls magnetic materials.
- Classified as Permanent or Temporary
- magnetic field - -The area of magnetic force around a magnet
- Electromagnetism - -When current flows through a conductor , it creates a
magnetic field around the conductor
- Field Strength depends on - -- Number of turns of the conductor in the coil
- Amount of current flow through the coup
- Type of core material
, - Left Hand Rule - -Thumb points in direction of current flow
- As your Polarity changes - -So does your direction of current
- Convert AC to DC - -RMS converts AC to DC
- Vrms = 0.707 x Vpk
- Vavg = 0.637 x Vpk
- 3 Characteristics Needed For Sine Wave Calculations - -- Frequency
- Period
- Wavelength
- Period Symbol - -T ( Time )
- Harmonics - -- Fundamental Frequency
- Harmonic Frequency
Ex - 60 Hz
2nd Harmonic is 120 Hz
Subharmonic is division
- Sinusoidal and Non - Sinusoidal Waveforms - -- Non - Sinusoidal Waves
result from harmonic frequencies being allowed to combine with a
fundamental and only harmonics
- Triangle vs Sawtooth - -Triangle - Even rise and fall
Sawtooth - Uneven rise and fall
- Is a function generator test equipment - -A function generator is not test
equipment
- Peak vs peak to peak - -Peak is Half the wave
Peak to peak is the entire wave
- Inductance opposes change in what - -Opposes change in current
- Inductor measured in - -Measured in Henrys
- Electromagnetic induction - -the process of creating a current in a circuit
by changing a magnetic field
- In an AC circuit that contains only inductance , there are three varying
quantities - -- Applied Voltage
- Induced EMF
- Circuit Current
