E6D01:

How many turns will be required to produce a 5-microhenry inductor using a powdered-iron toroidal core that has an inductance index (A L) value of 40 microhenrys/100 turns?

  1. 35 turns
  2. 13 turns
  3. 79 turns
  4. 141 turns

E6D02:

What is the equivalent circuit of a quartz crystal?

  1. Motional capacitance, motional inductance, and loss resistance in series, all in parallel with a shunt capacitor representing electrode and stray capacitance
  2. Motional capacitance, motional inductance, loss resistance, and a capacitor representing electrode and stray capacitance all in parallel
  3. Motional capacitance, motional inductance, loss resistance, and a capacitor representing electrode and stray capacitance all in series
  4. Motional inductance and loss resistance in series, paralleled with motional capacitance and a capacitor representing electrode and stray capacitance

E6D03:

Which of the following is an aspect of the piezoelectric effect?

  1. Mechanical deformation of material by the application of a voltage
  2. Mechanical deformation of material by the application of a magnetic field
  3. Generation of electrical energy in the presence of light
  4. Increased conductivity in the presence of light

E6D04:

Which materials are commonly used as a slug core in a variable inductor?

  1. Polystyrene and polyethylene
  2. Ferrite and brass
  3. Teflon and Delrin
  4. Cobalt and aluminum

E6D05:

What is one reason for using ferrite cores rather than powdered-iron in an inductor?

  1. Ferrite toroids generally have lower initial permeability
  2. Ferrite toroids generally have better temperature stability
  3. Ferrite toroids generally require fewer turns to produce a given inductance value
  4. Ferrite toroids are easier to use with surface mount technology

E6D06:

What core material property determines the inductance of a toroidal inductor?

  1. Thermal impedance
  2. Resistance
  3. Reactivity
  4. Permeability

E6D07:

What is the usable frequency range of inductors that use toroidal cores, assuming a correct selection of core material for the frequency being used?

  1. From a few kHz to no more than 30 MHz
  2. From less than 20 Hz to approximately 300 MHz
  3. From approximately 10 Hz to no more than 3000 kHz
  4. From about 100 kHz to at least 1000 GHz

E6D08:

What is one reason for using powdered-iron cores rather than ferrite cores in an inductor?

  1. Powdered-iron cores generally have greater initial permeability
  2. Powdered-iron cores generally maintain their characteristics at higher currents
  3. Powdered-iron cores generally require fewer turns to produce a given inductance
  4. Powdered-iron cores use smaller diameter wire for the same inductance

E6D09:

What devices are commonly used as VHF and UHF parasitic suppressors at the input and output terminals of a transistor HF amplifier?

  1. Electrolytic capacitors
  2. Butterworth filters
  3. Ferrite beads
  4. Steel-core toroids

E6D10:

What is a primary advantage of using a toroidal core instead of a solenoidal core in an inductor?

  1. Toroidal cores confine most of the magnetic field within the core material
  2. Toroidal cores make it easier to couple the magnetic energy into other components
  3. Toroidal cores exhibit greater hysteresis
  4. Toroidal cores have lower Q characteristics

E6D11:

How many turns will be required to produce a 1-mH inductor using a core that has an inductance index (A L) value of 523 millihenrys/1000 turns?

  1. 2 turns
  2. 4 turns
  3. 43 turns
  4. 229 turns

E6D12:

What is the definition of saturation in a ferrite core inductor?

  1. The inductor windings are over coupled
  2. The inductor's voltage rating is exceeded causing a flashover
  3. The ability of the inductor's core to store magnetic energy has been exceeded
  4. Adjacent inductors become over-coupled

E6D13:

What is the primary cause of inductor self-resonance?

  1. Inter-turn capacitance
  2. The skin effect
  3. Inductive kickback
  4. Non-linear core hysteresis

E6D14:

Which type of slug material decreases inductance when inserted into a coil?

  1. Ceramic
  2. Brass
  3. Ferrite
  4. Powdered-iron

E6D15:

What is current in the primary winding of a transformer called if no load is attached to the secondary?

  1. Magnetizing current
  2. Direct current
  3. Excitation current
  4. Stabilizing current

E6D16:

What is the common name for a capacitor connected across a transformer secondary that is used to absorb transient voltage spikes?

  1. Clipper capacitor
  2. Trimmer capacitor
  3. Feedback capacitor
  4. Snubber capacitor

E6D17:

Why should core saturation of a conventional impedance matching transformer be avoided?

  1. Harmonics and distortion could result
  2. Magnetic flux would increase with frequency
  3. RF susceptance would increase
  4. Temporary changes of the core permeability could result