Small Gas Engines Chapter 9 Test

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  • 1/23 Questions

    List three good electrical current conductors.

    • Copper, aluminum, silver
    • Gold, wax, paper
    • Metal, glass, pizza
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About This Quiz

This test from the Small Gas Engines Chapter 9 evaluates knowledge on ignition systems, focusing on tasks like voltage provision and timing for spark plugs, and identifying key components and electrical theories relevant to small engine technology.

Mechanical Engineering Quizzes & Trivia

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  • 2. 

    List three good insulating materials.

    • Glass, rubber, plastic

    • Gold, silver, copper

    • Pizza, hotdogs, hamburgers

    Correct Answer
    A. Glass, rubber, plastic
    Explanation
    Glass, rubber, and plastic are good insulating materials because they have high resistance to the flow of heat and electricity. These materials do not conduct heat or electricity easily, making them effective in preventing the transfer of energy. Glass is a non-metallic material with low thermal conductivity, while rubber and plastic are both non-conductive materials. Therefore, these materials are commonly used in various applications such as electrical insulation, building insulation, and thermal packaging.

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  • 3. 

    A source of electricity ___________________.

    • Lacks electrons and is positively charged

    • Is hard to find sometimes

    • Lacks power

    Correct Answer
    A. Lacks electrons and is positively charged
    Explanation
    A source of electricity that lacks electrons means that it has an excess of positively charged particles (protons). In other words, it is positively charged. This is because electrons are negatively charged and their absence in the source of electricity leads to a net positive charge. Therefore, a source of electricity that lacks electrons is positively charged.

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  • 4. 

    If a four-cycle engine runs at 3600 rpm, the number of sparks per minute required at the spark plug would be ___________ per minute.

    • 1800

    • 180

    • 18

    Correct Answer
    A. 1800
    Explanation
    A four-cycle engine requires a spark plug to ignite the fuel mixture once every two revolutions of the crankshaft. Since the engine runs at 3600 rpm (revolutions per minute), the spark plug needs to produce sparks at half that rate, which is 1800 sparks per minute.

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  • 5. 

    Electrical current in the primary circuit of a battery ignition system flows from ____________________.

    • Positive to negative

    • Cord to outlet

    • Smoothly most of the time

    Correct Answer
    A. Positive to negative
    Explanation
    In a battery ignition system, the electrical current flows from the positive terminal of the battery to the negative terminal. This is because the positive terminal is connected to the primary winding of the ignition coil, while the negative terminal is connected to the ground or chassis of the vehicle. As the current flows through the primary circuit, it creates a magnetic field that is used to generate a high voltage spark in the secondary circuit, which is then used to ignite the fuel-air mixture in the engine.

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  • 6. 

    What are the three ways in which an electrical potential can be produced?

    • Starting the enginee

    • Mechanically, statically, chemically

    • Gas, kerosene, lightning

    Correct Answer
    A. Mechanically, statically, chemically
    Explanation
    An electrical potential can be produced in three ways: mechanically, statically, and chemically. Mechanically, an electrical potential can be generated through the movement of mechanical parts, such as in a generator or alternator. Statically, an electrical potential can be created through the accumulation of static charges, such as through friction or rubbing. Chemically, an electrical potential can be produced through chemical reactions, such as in a battery or fuel cell. These three methods provide different ways to generate electrical potential for various applications.

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  • 7. 

    What happens when a coil of wire is passed through a magnetic field?

    • Current will flow

    • Current will not flow

    Correct Answer
    A. Current will flow
    Explanation
    When a coil of wire is passed through a magnetic field, the magnetic field induces a voltage in the coil according to Faraday's law of electromagnetic induction. This induced voltage causes an electric current to flow through the coil. Hence, the correct answer is "current will flow".

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  • 8. 

    In a circuit of 5 amperes and 2 ohms, the voltage would be _______________.

    • 1 amp

    • 10 volts

    • 100 ohms

    Correct Answer
    A. 10 volts
    Explanation
    The voltage in a circuit can be calculated using Ohm's Law, which states that voltage (V) is equal to the current (I) multiplied by the resistance (R). In this case, the current is given as 5 amperes and the resistance is given as 2 ohms. Therefore, the voltage would be 5 amperes multiplied by 2 ohms, which equals 10 volts.

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  • 9. 

    Substances that have electrons that can move freely from atom to atom are said to be good ___________.

    • Friends

    • Conductors

    • Nonconductors

    Correct Answer
    A. Conductors
    Explanation
    Substances that have electrons that can move freely from atom to atom are said to be good conductors. Conductors allow the flow of electric current because their outermost electrons are loosely bound and can easily move through the material. This property makes them suitable for transmitting electricity or heat efficiently. In contrast, nonconductors or insulators have tightly bound electrons, which do not move easily, resulting in poor conductivity. Therefore, the correct answer is conductors.

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  • 10. 

    In the ignition coil, the primary winding has _______________.

    • Few turns of heavy of wire

    • Many turns of fine wire

    Correct Answer
    A. Few turns of heavy of wire
    Explanation
    The primary winding of an ignition coil has few turns of heavy wire. This is because the primary winding is responsible for carrying the high current needed to generate a magnetic field. Using heavy wire with few turns allows for a lower resistance, which in turn allows for a higher current flow. This high current flow creates a strong magnetic field, which is necessary for the efficient operation of the ignition coil.

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  • 11. 

    The greatest resistance to the highest voltage in the ignition circuit occurs at ________/

    • Spark plug

    • Condenser

    • Breaking point

    Correct Answer
    A. Spark plug
    Explanation
    The spark plug is the correct answer because it is the component in the ignition circuit that generates the spark needed to ignite the fuel-air mixture in the engine. When the highest voltage is applied to the spark plug, it creates a strong electric field that ionizes the air and creates a spark. This requires a high amount of resistance to overcome, making the spark plug the component with the greatest resistance in the ignition circuit.

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  • 12. 

    The two major tasks performed by an ignition system are to _________________ and ____________.

    • Starting and stopping the engine

    • Provide voltage to fire the spark plug, fire it at exactly the right time

    • Provide voltage to fire the spark plug

    Correct Answer
    A. Provide voltage to fire the spark plug, fire it at exactly the right time
    Explanation
    The ignition system has two main tasks: providing voltage to fire the spark plug and ensuring that it fires at the precise moment. The first task involves generating a high voltage to create a spark that ignites the air-fuel mixture in the combustion chamber. The second task is crucial for optimal engine performance as the spark must occur at the correct time in the engine's cycle to maximize power and efficiency. By providing the necessary voltage and timing, the ignition system plays a vital role in starting and running the engine smoothly.

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  • 13. 

    Electric current in a battery flows from _____________.

    • One battery to the other

    • Smoothly most of thte time

    • Negative to positive

    Correct Answer
    A. Negative to positive
    Explanation
    Electric current in a battery flows from the negative terminal to the positive terminal. This is because the negative terminal of a battery has an excess of electrons, while the positive terminal has a deficit of electrons. Electrons flow from the negative terminal, through the external circuit, and into the positive terminal, creating an electric current.

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  • 14. 

    The electron theory states that _____________.

    • Protons repel electrons

    • Like charges repel each other

    • Like charges attract each other

    Correct Answer
    A. Like charges repel each other
    Explanation
    The electron theory states that like charges repel each other. This means that if two objects have the same charge, they will push away from each other. This concept is based on the fundamental property of electric charge, which can be positive or negative. Like charges, such as two positive charges or two negative charges, will experience a force of repulsion, causing them to move apart. This principle is essential in understanding the behavior of charged particles and the interactions between them.

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  • 15. 

    Regarding atoms, _____________.

    • Electrons do not collide because they are negatively charged.

    • Electrons and protons are closely bonded together

    • Electrons are positively charged together

    Correct Answer
    A. Electrons do not collide because they are negatively charged.
    Explanation
    Electrons do not collide because they are negatively charged. This is because like charges repel each other, so the negatively charged electrons repel each other and try to maintain a certain distance between them. This repulsion force prevents the electrons from colliding with each other.

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  • 16. 

    Which response has the units of measurement correct?

    • Rate of electron-volts, resistance to electron flow-amperes, electrical potential-ohms

    • Rate of electron - amperes, resistance to electron fllow-ohms, electrical potential- volts

    • Rate of electron-ohms, resistence to electron flow-amperes, electrical potential-volts

    Correct Answer
    A. Rate of electron - amperes, resistance to electron fllow-ohms, electrical potential- volts
    Explanation
    The correct answer is "rate of electron - amperes, resistance to electron flow-ohms, electrical potential- volts." This answer correctly matches the units of measurement with their respective quantities. The rate of electrons is measured in amperes, resistance to electron flow is measured in ohms, and electrical potential is measured in volts.

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  • 17. 

    In a circuit with 12 volts and 5 amperes, the resistance would be _______________ ohms.

    • 2.4

    • 100

    • 5000

    Correct Answer
    A. 2.4
    Explanation
    The resistance in a circuit can be calculated using Ohm's Law, which states that resistance (R) is equal to voltage (V) divided by current (I). In this case, the voltage is 12 volts and the current is 5 amperes. So, the resistance would be 12 volts divided by 5 amperes, which is equal to 2.4 ohms.

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  • 18. 

    1. Name the six main electrical components that make up the magneto ignition system.

    • Permanent magnets, ignition coil, breaker points and cam (or electronic switching device)

    • Permanent magnets, ignition coil, spark plug, and condenser.

    • Permanent magnets, ignition coil, breaker points and cam (or electronic switching device), high tension wire, spark plug, and condenser.

    Correct Answer
    A. Permanent magnets, ignition coil, breaker points and cam (or electronic switching device), high tension wire, spark plug, and condenser.
    Explanation
    The correct answer includes all six main electrical components that make up the magneto ignition system. These components are permanent magnets, ignition coil, breaker points and cam (or electronic switching device), high tension wire, spark plug, and condenser.

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  • 19. 

    Would a cool spark plug have a short or long  insulator nose?

    • Long

    • Short

    Correct Answer
    A. Short
    Explanation
    A cool spark plug would have a short insulator nose. This is because a shorter insulator nose allows for better heat transfer from the spark plug to the engine's cooling system. This helps in preventing the spark plug from overheating and ensures optimal performance.

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  • 20. 

    The coil acts as a transformer that ___________________.

    • Slows down the voltage and increases the output amperage

    • Steps up the voltage and decreases the output amperage

    Correct Answer
    A. Steps up the voltage and decreases the output amperage
    Explanation
    The coil acts as a transformer that steps up the voltage and decreases the output amperage. This means that the coil increases the voltage level while reducing the amount of current flowing through it. Transformers are commonly used in electrical systems to change the voltage levels for different applications, such as stepping up the voltage for long-distance power transmission or stepping down the voltage for household appliances.

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  • 21. 

    What happens when electric current is passed through a coil of wire?

    • Nothing

    • The copper wire glows

    • A magnetic field is developed

    Correct Answer
    A. A magnetic field is developed
    Explanation
    When an electric current is passed through a coil of wire, a magnetic field is developed. This is because the flow of electric charges creates a circular magnetic field around the wire. The strength of the magnetic field depends on factors such as the number of turns in the coil, the current flowing through it, and the material of the wire. This phenomenon is utilized in various applications, such as electromagnets and electric motors, where the generated magnetic field is used to produce mechanical motion or attract magnetic materials.

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  • 22. 

    Soft iron used in the laminations of a coil or transformer has ________________.

    • Poor magnetic retention

    • Good magnetic retention

    • Nonmagnetic properties

    Correct Answer
    A. Poor magnetic retention
    Explanation
    Soft iron used in the laminations of a coil or transformer has poor magnetic retention. This means that it does not retain its magnetism well and easily loses its magnetic properties when the magnetic field is removed. Soft iron is preferred for laminations in transformers and coils because it allows for efficient magnetic induction and reduces energy losses due to hysteresis. Its low magnetic retention ensures that the magnetic field can be easily manipulated and controlled, making it ideal for applications where frequent changes in magnetism are required.

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  • 23. 

    Spark plugs of the cool type should always be matched with cool running engines.

    • True

    • False

    Correct Answer
    A. False
    Explanation
    The statement is false because spark plugs of the cool type should be matched with hot running engines, not cool running engines. Cool type spark plugs have a longer insulator nose that helps dissipate heat, making them suitable for engines that run at higher temperatures. On the other hand, hot type spark plugs have a shorter insulator nose and are designed for engines that run at lower temperatures. Matching the correct spark plug type with the engine's operating temperature is important for optimal performance and longevity.

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  • Current Version
  • Mar 21, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Nov 12, 2011
    Quiz Created by
    Tkblaylock
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