Electronic Principles MCQ

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• Which one of the following statements most accurately reflects the nature of ac power?
  ক

  The current in an ac circuit flows in one direction, but changes value periodically

  খ

  The current in an ac circuit flows in one direction at a steady level

  গ

  The current in an ac circuit changes direction periodically

  ঘ

  The current in an ac circuit flows in two directions at the same time

  ঙ

  None of the above
• What causes the depletion layer?
  ক

  Doping

  খ

  Recombination

  গ

  Barrier potential

  ঘ

  Ions

  ঙ

  None of the above
• When operating below its resonant frequency, a parallel RLC circuit has the characteristics of a:
  ক

  parallel RL circuit

  খ

  parallel RC circuit

  গ

  parallel RLC circuit operated above its resonant frequency

  ঘ

  purely resistive circuit

  ঙ

  None of the above
• At room temperature an intrinsic silicon crystal acts approximately like
  ক

  a battery

  খ

  a conductor

  গ

  an insulator

  ঘ

  a piece of copper wire

  ঙ

  None of the above
• What is one important thing transistors do?
  ক

  Emit light

  খ

  Amplify weak signals

  গ

  Regulate voltage

  ঘ

  Rectify line voltage

  ঙ

  None of the above
• A low-pass filter:
  ক

  passes lower-frequency signals and reduces higher-frequency signals

  খ

  passes higher-frequency signals and reduces lower-frequency signals

  গ

  has no effect on ac signals

  ঘ

  reduces the level of all frequencies by a significant amount

  ঙ

  None of the above
• Which one of the following statements is true for the voltage in a parallel RL circuit?
  ক

  The voltage always has the same amplitude and phase for every part of the circuit

  খ

  The total voltage is equal to the sum of the voltages across the resistance and inductance

  গ

  The total voltage lags the total current by less than 90

  ঘ

  The total voltages is less than the sum of the voltages across the resistance and inductance

  ঙ

  None of the above
• The net charge of a neutral copper atom is
  ক

  0

  খ

  1

  গ

  -1

  ঘ

  4

  ঙ

  None of the above
• Doubling the operating frequency of a capacitive circuit:
  ক

  doubles the amount of a capacitive reactance

  খ

  has no effect on the capacitive reactance

  গ

  cuts the capacitive reactance in half

  ঘ

  multiplies the capacitive reactance by 6.28

  ঙ

  None of the above
• Norton's theorem replaces a complicated circuit facing a load by an
  ক

  Ideal voltage source and parallel resistor

  খ

  Ideal current source and parallel resistor

  গ

  Ideal voltage source and series resistor

  ঘ

  Ideal current source and series resistor

  ঙ

  None of the above
• The total inductive reactance of a parallel inductor circuit is:
  ক

  equal to the sum of the individual inductive-reactance values

  খ

  equal to the sum of the individual inductance values

  গ

  equal to the source voltage divided by total current

  ঘ

  less than the inductance value of the smallest inductor

  ঙ

  None of the above
• Which one of the following statements applies to common, non-rechargeable flashlight batteries?
  ক

  Common flashlight batteries are secondary wet-cell batteries

  খ

  Common flashlight batteries are primary wet-cell batteries

  গ

  Common flashlight batteries are primary dry-cell batteries

  ঘ

  Common flashlight batteries are secondary dry-cell batteries

  ঙ

  None of the above
• What kind of device is a diode?
  ক

  Bilateral

  খ

  Linear

  গ

  Nonlinear

  ঘ

  Unipolar

  ঙ

  None of the above
• Thevenin theorem replaces a complicated circuit facing a load by an
  ক

  Ideal voltage source and parallel resistor

  খ

  Ideal current source and parallel resistor

  গ

  Ideal voltage source and series resistor

  ঘ

  Ideal current source and series resistor

  ঙ

  None of the above
• The total capacitive reactance of a parallel capacitor circuit is:
  ক

  equal to the sum of the individual capacitive-reactance values

  খ

  equal to the sum of the individual capacitance values

  গ

  equal to the source voltage divided by total current

  ঘ

  less than the capacitance value of the smallest capacitor

  ঙ

  None of the above
• Which one of the following equations most directly leads to the resistance of an ordinary household light bulb, assuming that you know the power and voltage rating?
  ক

  R = E²/P

  খ

  P = PR

  গ

  P = E²/R

  ঘ

  I = P/E

  ঙ

  None of the above
• A real voltage source has
  ক

  Zero internal resistance

  খ

  Infinite internal resistance

  গ

  A small internal resistance

  ঘ

  A large internal resistance

  ঙ

  None of the above
• Current is
  ক

  The flow of charged particles through a material

  খ

  An imbalance of electrical charges

  গ

  The force that causes electrons to flow

  ঘ

  The number of free electrons in an atom

  ঙ

  None of the above
• What are the main parts of an atom?
  ক

  Protons only

  খ

  Electrons, protons, and ions

  গ

  Electrons, ions, and neutrons

  ঘ

  Electrons, protons, and neutrons

  ঙ

  None of the above
• Which one of the following statements most accurately describes the nature of inductive reactance?
  ক

  Inductive reactance is an opposition to current flow in dc circuits

  খ

  Inductive reactance is an opposition to current flow in ac circuits

  গ

  Inductive reactance is another term for counter emf

  ঘ

  Inductive reactance is a force that tends to overcome the effects of counter emf

  ঙ

  None of the above
• Which one of the following statements regarding ac circuits is correct?
  ক

  Current and voltages are in phase through a resistor

  খ

  Current leads the voltage through a resistor

  গ

  Current lags the voltage through a resistor

  ঘ

  All of the above

  ঙ

  None of the above
• Which one of the following is most likely used for measuring the rate of electron flow?
  ক

  Voltmeter

  খ

  Ammeter

  গ

  Wattmeter

  ঘ

  Ohmmeter

  ঙ

  None of the above
• Determine the resistance value and tolerance of a resistor that has the following color bands; first band is red, second band is red, third band is orange, and the fourth band is gold
  ক

  220 Ohm, 5%

  খ

  220 Ohm, 10%

  গ

  22,000 Ohm, 5%

  ঘ

  22, 000 Ohm, 10%

  ঙ

  None of the above
• Which one of the following statements is true for the currents in a series RC circuit?
  ক

  The current always has the same amplitude and phase for every part of the circuit

  খ

  The total current is equal to the sum of the currents for the resistance and capacitance

  গ

  The total current is greater than the sum of the currents for the resistance and capacitance

  ঘ

  The total current is less than the sum of the currents for the resistance and capacitance

  ঙ

  None of the above
• The saturation point is approximately the same as
  ক

  cutoff point

  খ

  lower end of the load line

  গ

  upper end of the load line

  ঘ

  infinity

  ঙ

  None of the above
• Which one of the following phrases most accurately describes a purely capacitive circuit?
  ক

  Resistances provide the only opposition to current flow

  খ

  Capacitive reactance provides the only opposition to current flow

  গ

  The ac voltage leads the current by 90 degree

  ঘ

  Combinations of resistance and capacitive reactance provide any opposition to current flow

  ঙ

  None of the above
• A loadstone is:
  ক

  a natural magnet

  খ

  a temporary magnet

  গ

  an artificial magnet

  ঘ

  a paramagnetic alloy

  ঙ

  None of the above
• A transistor has how many doped regions?
  ক

  1

  খ

  2

  গ

  3

  ঘ

  4

  ঙ

  None of the above
• What is the difference between the kinds of charges for an electron and a proton?
  ক

  An electron has a positive charge and a proton has no charge

  খ

  An electron has a positive charge and a proton has a negative charge

  গ

  An electron has a negative charge and a proton has a positive charge

  ঘ

  An electron has a negative charge and a proton has no charge

  ঙ

  None of the above
• Inductive reactance is measured in units of:
  ক

  volts per second

  খ

  amperes per second

  গ

  Ohm

  ঘ

  henrys

  ঙ

  None of the above