Electrochemistry Quiz: Primary Cells
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Questions and Answers

What is a primary cell characterized by?

  • No corrosion occurring during the process.
  • A reversible chemical reaction that can be recharged.
  • A constant potential difference regardless of materials used.
  • An irreversible chemical reaction that cannot return to its initial stage. (correct)

    • In a zinc-carbon cell, what role does the zinc electrode play?

  • It serves as the electrolyte.
  • It acts as the anode. (correct)
  • It acts as the cathode.
  • It acts as the conductor.

    • What happens to the electrodes of a secondary cell during the recharging process?

  • They undergo a reversible chemical reaction. (correct)
  • They are corroded by the electrolyte.
  • They develop a constant potential difference.
  • They remain in the same chemical state.

    • What type of electrolyte is typically used in primary cells?

    <p>Liquid, semi-liquid, or dry options.</p> Signup and view all the answers

    What factor influences the voltage developed by a cell?

    <p>The chemical properties of the materials and circuit resistance.</p> Signup and view all the answers

    Which of the following statements about secondary cells is false?

    <p>They utilize an irreversible chemical reaction.</p> Signup and view all the answers

    What component serves as the electrolyte in a zinc-carbon cell?

    <p>Ammonium chloride paste.</p> Signup and view all the answers

    Which type of reaction occurs in primary cells?

    <p>A spontaneous and irreversible reaction.</p> Signup and view all the answers

    What do the lines in Faraday's method represent?

    <p>The direction and shape of electrical fields</p> Signup and view all the answers

    How does the density of lines of force relate to electric field intensity?

    <p>Higher concentration of lines indicates stronger intensity</p> Signup and view all the answers

    What do the arrows on the lines of force indicate?

    <p>The direction of movement for positive charges</p> Signup and view all the answers

    Which of the following scenarios can be represented using Faraday's lines of force?

    <p>The field between two opposite charges</p> Signup and view all the answers

    Why are the representations of electric fields often two-dimensional?

    <p>It is necessary due to practical reasons</p> Signup and view all the answers

    What improvement was made to Faraday's method regarding line drawing?

    <p>Varying the number of lines to show intensity</p> Signup and view all the answers

    In what scenario would you see more spread out lines of force in Faraday's representation?

    <p>In regions where the electric field is weak</p> Signup and view all the answers

    What type of charges can Faraday's method represent while using lines of force?

    <p>Both opposite and same charges</p> Signup and view all the answers

    How does the length of a conductor affect its resistance?

    <p>Resistance increases with increasing length.</p> Signup and view all the answers

    What is matter defined as?

    <p>Anything that occupies space and has weight.</p> Signup and view all the answers

    What happens to the resistance of a conductor when additional identical lengths are connected in parallel?

    <p>Resistance decreases due to an increased cross-sectional area.</p> Signup and view all the answers

    What is the relationship between the cross-sectional area of a conductor and its resistance?

    <p>Resistance is inversely proportional to the cross-sectional area.</p> Signup and view all the answers

    What distinguishes elements from compounds?

    <p>Elements cannot be chemically broken down, but compounds can.</p> Signup and view all the answers

    How many known elements are there?

    <p>Over 100.</p> Signup and view all the answers

    Which property of materials determines their effectiveness in conducting electric current?

    <p>Resistivity.</p> Signup and view all the answers

    What overall effect does material resistivity have on the resistance of a conductor?

    <p>Resistance is directly proportional to resistivity.</p> Signup and view all the answers

    Which of the following is a compound?

    <p>Salt.</p> Signup and view all the answers

    What is an atom?

    <p>The smallest particle that encloses the characteristics of an element.</p> Signup and view all the answers

    Why can more than 100 elements produce all substances in nature?

    <p>Because they can be arranged in various combinations.</p> Signup and view all the answers

    Which of the following statements is true regarding elements?

    <p>Each element presents its own specific characteristics.</p> Signup and view all the answers

    What represents a common misconception about elements and compounds?

    <p>All compounds are made of two elements.</p> Signup and view all the answers

    What happens to the charge of a body when it gets electrically charged?

    <p>The charge distributes uniformly on its entire surface.</p> Signup and view all the answers

    What is required to determine the total electric field in a given point?

    <p>The sum of effects from each charged body around that point.</p> Signup and view all the answers

    How is the resulting vector of two electric fields best represented?

    <p>As the diagonal of the parallelogram built with the two vectors.</p> Signup and view all the answers

    What determines the intensity of the resulting vector in vectorial composition of electric fields?

    <p>The intensity and direction of its components.</p> Signup and view all the answers

    What is the direction of the resulting vector when two electric field vectors are at 45 degrees to each other?

    <p>Towards the north-east.</p> Signup and view all the answers

    Which of the following statements is NOT true about the electric field?

    <p>Electric fields can exist independently of charges.</p> Signup and view all the answers

    Which method is used to analyze the effects of multiple electric fields at a point?

    <p>Vector addition considering direction.</p> Signup and view all the answers

    What is the effect of charge position in a uniformly charged body?

    <p>Charge is located entirely on the external surface.</p> Signup and view all the answers

    Which principle explains the direction of induced current when a conductor moves through a magnetic field?

    <p>Lenz's Law</p> Signup and view all the answers

    What primarily affects the magnitude of an induced voltage in a conductor?

    <p>The rate of change of magnetic flux</p> Signup and view all the answers

    Which factor does NOT affect mutual inductance between two coils?

    <p>The temperature of the coils</p> Signup and view all the answers

    In the context of DC motors, which factor does NOT impact the speed of the motor?

    <p>The size of the motor's casing</p> Signup and view all the answers

    What is the primary purpose of magnetic shielding?

    <p>To protect against external magnetic fields</p> Signup and view all the answers

    The phenomenon of eddy currents is primarily associated with which scenario?

    <p>Magnetic material experiencing alternating current</p> Signup and view all the answers

    Which property is crucial for materials to be used as permanent magnets?

    <p>High coercive force</p> Signup and view all the answers

    What is the function of back EMF in a DC motor?

    <p>To oppose the applied voltage and reduce current</p> Signup and view all the answers

    What condition must be met for magnetic shielding to be effective?

    <p>The shield must be closed loop with no gaps</p> Signup and view all the answers

    When constructing an electromagnet, what is the effect of increasing the number of wire turns?

    <p>It increases the magnetic field strength</p> Signup and view all the answers

    Study Notes

    Electrical Fundamentals for Aircraft Maintenance Licence Category B1

    • Module 3: Electrical Fundamentals

    • Topic: Electron Theory

      • Structure and distribution of electrical charges in atoms, molecules, ions, and compounds
      • Molecular structure of conductors, semiconductors, and insulators

    • Topic: Static Electricity and Conduction

      • Static electricity and distribution of electrostatic charges
      • Electrostatic laws of attraction and repulsion
      • Units of charge and Coulomb's law
      • Conduction of electricity in solids, liquids, gases, and vacuum

    • Topic: Electrical Terminology

      • Terms, units, and factors affecting them

    • Topic: Generation of Electricity

      • Production of electricity by various methods (light, heat, friction, pressure, chemical action, magnetism, and motion)

    • Topic: DC Sources of Electricity

      • Construction and basic chemical action of primary cells, secondary cells (lead-acid, nickel-cadmium, etc.), and other alkaline cells
      • Cells connected in series and parallel
      • Internal resistance and its effect on a battery
      • Construction, materials, and operation of thermocouples
      • Operation of photo-cells

    • Topic: DC Circuits

      • Ohm's law, Kirchhoff's voltage and current laws
      • Calculating resistance, voltage, and current
      • Significance of internal resistance of a supply

    • Topic: Resistance/Resistor

      • Resistance and affecting factors (length, area, material resistivity)
      • Specific resistance (material property)
      • Resistor color code, values, tolerances, preferred values, and wattage ratings -Resistors in series and parallel

    • Topic: Operation and use of potentiometers and rheostats

    • Topic: Operation of Wheatstone Bridge

    • Topic: Positive and negative temperature coefficient conductance

    • Topic: Capacitor/Capacitance

      • Operation and function of a capacitor
      • Factors affecting capacitance (area of plates, distance between plates, number of plates, dielectric, and dielectric constant)
      • Capacitor types, construction, and function (paper, mica, ceramic, electrolytic) -Capacitor color coding -Calculations of capacitance and voltage in series and parallel

    • Topic: Exponential charge and discharge of a capacitor, time constant -Testing of capacitors

    • Topic: Magnetism

      • Magnetic Theory
      • Properties of a Magnet
      • Action of a Magnet Suspended in the Earth's Magnetic Field
      • Magnetization and Demagnetization -Magnetic Shielding -Various types of magnetic material (diamagnetic, paramagnetic, ferromagnetic) -Electromagnets: construction and principles of operations

    • Topic: Electromagnetism

      • Faraday's experiments and law
      • Lenz's law and polarity determining rules
      • Inductor Action, Self-Inductance
        • Effects of Change rate in Conducting Flux
        • Mutual Induction and Effects
        • Exponential curve of Inductor current and Saturation Point

    • Topic: AC theory

      • Sinusoidal waveform: phase, period, frequency, cycle
      • Calculations involving instantaneous, average, RMS (root mean square), peak and peak-to-peak current values, in relation to voltage, current, and power

    • Topic: Triangular/Square waves

    • Topic: Single and three-phase principles

    • Topic: Resistive, Capacitive, and Inductive Circuits

    • Topic: Transformer, Filters

      • Transformer Construction
      • Transformer Operation under load and no-load condition
      • Transformer Losses and methods for overcoming them
      • Calculation of Line and Phase Voltages and Currents in a Three-Phase System

    • Topic: AC Motors

      • AC Motor construction, operation and characteristics (synchronous vs. induction motors)
      • Rotating Magnetic Field
      • Speed control and direction of rotation
      • Capacitor Start
      • Resistor Start
      • Shaded-Pole Motor

    • Topic: Additional Notes

      • Specific types of cells and batteries
      • Units of measurement
      • Safety procedures

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    Electrical Fundamentals for Aircraft Maintenance Licence PDF

    Description

    Test your knowledge about primary cells, particularly focusing on the zinc-carbon cell. Understand the role of zinc as an electrode and the characteristics that define primary cells in electrochemistry.

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