Electronic Principles MCQ

Test your knowledge with important Electronic Principles MCQ and their applications. These MCQs are beneficial for competitive exams too. Explore 30 + more Electronic Principles MCQs at Bissoy

• The period of a waveform is:
  ক

  the time required to complete one full cycle

  খ

  the number of cycles completed in one second

  গ

  the time required for the voltage to rise from 10% to 90% of the peak amplitude

  ঘ

  equal to 0.707 times the peak amplitude

  ঙ

  None of the above
• The equivalent of 1 kV is:
  ক

  1.00 V

  খ

  1000 V

  গ

  100 mV

  ঘ

  1000 mV

  ঙ

  None of the above
• What is the total resistance of a parallel circuit that contains two resistors having values of 220 ohm and 470 ohm?
  ক

  220 ohm

  খ

  150 ohm

  গ

  445 ohm

  ঘ

  690 ohm

  ঙ

  None of the above
• The current gain of a transistor is defined as the ratio of the collector current to the
  ক

  base current

  খ

  emitter current

  গ

  supply current

  ঘ

  collector current

  ঙ

  None of the above
• Which one of the following principles best describes the basic operation of a generator?
  ক

  Like magnetic poles repel; unlike poles attract

  খ

  Current is induced in a conductor that is moving through a magnetic field

  গ

  Like magnetic poles attract; unlike poles repel

  ঘ

  Current flowing through a conductor generates a magnetic field

  ঙ

  None of the above
• A step-up transformer has a turns ratio of 1:4. If the line voltage is 115 V rms, what is the peak secondary voltage?
  ক

  700 V

  খ

  707 V

  গ

  651 V

  ঘ

  208 V

  ঙ

  None of the above
• 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
• What is the algebraic sum of this series of values:+2, -3, -6,+4?
  ক

  -6

  খ

  -3

  গ

  0

  ঘ

  2

  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
• A step-down transformer has turns ration of 5:1. If the primary voltage is 120 Vrms, what is the secondary voltage?
  ক

  12 V

  খ

  18 V

  গ

  24 V

  ঘ

  30 V

  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
• Suppose a voltage source has an ideal voltage of 15V and a source resistance of 0.2W. For what values of load resistance will the voltage source appear stiff?
  ক

  20 Ohm

  খ

  30 Ohm

  গ

  10 Ohm

  ঘ

  100 Ohm

  ঙ

  None of the above