E5D01:

What is the result of skin effect?

  1. As frequency increases, RF current flows in a thinner layer of the conductor, closer to the surface
  2. As frequency decreases, RF current flows in a thinner layer of the conductor, closer to the surface
  3. Thermal effects on the surface of the conductor increase the impedance
  4. Thermal effects on the surface of the conductor decrease the impedance

E5D02:

Why is it important to keep lead lengths short for components used in circuits for VHF and above?

  1. To increase the thermal time constant
  2. To avoid unwanted inductive reactance
  3. To maintain component lifetime
  4. All of these choices are correct

E5D03:

What is microstrip?

  1. Lightweight transmission line made of common zip cord
  2. Miniature coax used for low power applications
  3. Short lengths of coax mounted on printed circuit boards to minimize time delay between microwave circuits
  4. Precision printed circuit conductors above a ground plane that provide constant impedance interconnects at microwave frequencies

E5D04:

Why are short connections necessary at microwave frequencies?

  1. To increase neutralizing resistance
  2. To reduce phase shift along the connection
  3. Because of ground reflections
  4. To reduce noise figure

E5D05:

Which parasitic characteristic increases with conductor length?

  1. Inductance
  2. Permeability
  3. Permittivity
  4. Malleability

E5D06:

In what direction is the magnetic field oriented about a conductor in relation to the direction of electron flow?

  1. In the same direction as the current
  2. In a direction opposite to the current
  3. In all directions; omni-directional
  4. In a direction determined by the left-hand rule

E5D07:

What determines the strength of the magnetic field around a conductor?

  1. The resistance divided by the current
  2. The ratio of the current to the resistance
  3. The diameter of the conductor
  4. The amount of current flowing through the conductor

E5D08:

What type of energy is stored in an electromagnetic or electrostatic field?

  1. Electromechanical energy
  2. Potential energy
  3. Thermodynamic energy
  4. Kinetic energy

E5D09:

What happens to reactive power in an AC circuit that has both ideal inductors and ideal capacitors?

  1. It is dissipated as heat in the circuit
  2. It is repeatedly exchanged between the associated magnetic and electric fields, but is not dissipated
  3. It is dissipated as kinetic energy in the circuit
  4. It is dissipated in the formation of inductive and capacitive fields

E5D10:

How can the true power be determined in an AC circuit where the voltage and current are out of phase?

  1. By multiplying the apparent power times the power factor
  2. By dividing the reactive power by the power factor
  3. By dividing the apparent power by the power factor
  4. By multiplying the reactive power times the power factor

E5D11:

What is the power factor of an R-L circuit having a 60 degree phase angle between the voltage and the current?

  1. 1.414
  2. 0.866
  3. 0.5
  4. 1.73

E5D12:

How many watts are consumed in a circuit having a power factor of 0.2 if the input is 100-VAC at 4 amperes?

  1. 400 watts
  2. 80 watts
  3. 2000 watts
  4. 50 watts

E5D13:

How much power is consumed in a circuit consisting of a 100 ohm resistor in series with a 100 ohm inductive reactance drawing 1 ampere?

  1. 70.7 Watts
  2. 100 Watts
  3. 141.4 Watts
  4. 200 Watts

E5D14:

What is reactive power?

  1. Wattless, nonproductive power
  2. Power consumed in wire resistance in an inductor
  3. Power lost because of capacitor leakage
  4. Power consumed in circuit Q

E5D15:

What is the power factor of an R-L circuit having a 45 degree phase angle between the voltage and the current?

  1. 0.866
  2. 1.0
  3. 0.5
  4. 0.707

E5D16:

What is the power factor of an R-L circuit having a 30 degree phase angle between the voltage and the current?

  1. 1.73
  2. 0.5
  3. 0.866
  4. 0.577

E5D17:

How many watts are consumed in a circuit having a power factor of 0.6 if the input is 200VAC at 5 amperes?

  1. 200 watts
  2. 1000 watts
  3. 1600 watts
  4. 600 watts

E5D18:

How many watts are consumed in a circuit having a power factor of 0.71 if the apparent power is 500VA?

  1. 704 W
  2. 355 W
  3. 252 W
  4. 1.42 mW