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Quizzes > Computers & Technology > Electronics & Gadgets

Ignition Test Quiz: Can You Master Spark Generation & Firing Order?

Think you know which of the following is part of the ignition system? Take the test!

Difficulty: Moderate
2-5mins
Learning OutcomesCheat Sheet
Paper art illustration for ignition test quiz with spark, coil, and firing order symbols on sky blue background.

Ready to rev your engine knowledge? Take our free Ultimate Ignition Test Quiz: Spark, Coils & Firing Order and discover what function is performed by the ignition system as you sharpen your spark generation skills. Challenge yourself with must-answer questions like which of the following is part of the ignition system and identify key ignition coil types that keep your ride roaring. If you love hands-on learning, dive into our engine parts quiz for extra practice, or get up to speed with a practical ignition primer courtesy of our quick everfi ignition guide . No matter your experience level, you'll walk away with a stronger grasp of spark plug timing and coil differences. Start your ignition test now and ignite your confidence!

What is the primary purpose of the ignition coil in an internal combustion engine?
To convert low battery voltage to high voltage
To store fuel for combustion
To filter impurities in the fuel
To cool the engine coolant
The ignition coil transforms the vehicle's low-voltage battery power into the high voltage required to create an electric arc at the spark plug. This high voltage, often tens of thousands of volts, jumps the spark plug gap and ignites the air-fuel mixture. Without the coil stepping up the voltage, the spark plug could not generate the spark needed for combustion. https://en.wikipedia.org/wiki/Ignition_coil
Which component uses the high voltage from the ignition coil to create an electric spark?
Distributor drive
Fuel injector
Alternator
Spark plug
The spark plug is responsible for converting the high voltage from the ignition coil into an electric spark that ignites the air-fuel mixture in the combustion chamber. It has electrodes separated by a small gap where the spark jumps. All other components are involved in supporting functions but do not create the spark. https://en.wikipedia.org/wiki/Spark_plug
What role does the distributor play in older ignition systems?
Converting mechanical energy to electrical energy
Routing high voltage to the correct spark plug
Controlling engine oil pressure
Metering the air-fuel ratio
In traditional ignition systems, the distributor's rotor and cap route high-voltage pulses from the ignition coil to the appropriate spark plug wire. This ensures each cylinder fires in the correct order. Modern systems often eliminate the distributor in favor of coil-on-plug setups. https://en.wikipedia.org/wiki/Distributor_cap_and_rotor
Which coil design has two secondary outputs and fires two spark plugs simultaneously?
Distributor coil
Magneto
Waste spark coil
Coil-on-plug
A waste spark coil has two secondary windings and fires two spark plugs at once - one on the compression stroke and one on the exhaust stroke (the "wasted" spark). This simplifies the ignition architecture by reducing the number of coils. Coil-on-plug and distributor coils have different configurations. https://en.wikipedia.org/wiki/Wasted_spark_ignition
What is the common firing order for a four-cylinder inline engine?
1-2-3-4
2-4-3-1
1-4-2-3
1-3-4-2
Most inline four-cylinder engines use a 1-3-4-2 firing order to minimize vibrations and ensure smooth operation. This sequence balances the engine by spacing power strokes evenly. Deviating from this order can cause imbalance and rough running. https://en.wikipedia.org/wiki/Firing_order
In ignition systems, what does the term 'dwell angle' refer to?
The rotation angle of the distributor cap
The duration the coil primary winding is energized
The length of the spark at the plug
The gap between spark plug electrodes
Dwell angle is the amount of crankshaft rotation (measured in degrees) during which the coil primary circuit remains closed, allowing the coil to build magnetic energy. Proper dwell ensures optimal charge in the coil before sparking. Too short a dwell yields weak spark; too long may overheat the coil. https://automotivetechinfo.com/dwell-angle/
Which sensor provides the reference for ignition timing in modern engines?
Throttle position sensor
Crankshaft position sensor
Oxygen sensor
Knock sensor
The crankshaft position sensor (CKP) monitors the position and rotational speed of the crankshaft, delivering a precise reference for ignition timing. Engine control units (ECUs) use this data to time the spark event accurately. Without the CKP signal, the engine cannot determine when to fire spark plugs. https://en.wikipedia.org/wiki/Crankshaft_position_sensor
Typical spark plug gap for a gasoline engine is approximately:
0.1 - 0.3 mm
2.1 - 2.5 mm
0.7 - 1.1 mm
1.5 - 2.0 mm
Most modern gasoline engines specify a spark plug gap between 0.7 and 1.1 mm (0.028 - 0.044 inches) to ensure reliable ignition and efficient combustion. Gaps too small can cause weak sparks; too large may prevent the spark from jumping consistently. Always consult manufacturer specifications. https://en.wikipedia.org/wiki/Spark_plug_gap
What is a typical secondary voltage range produced by an automotive ignition coil?
500 - 1,000 volts
100,000 - 200,000 volts
1,000 - 2,000 volts
20,000 - 40,000 volts
Automotive ignition coils typically output between 20,000 and 40,000 volts (and sometimes higher) to ensure the spark can jump the spark plug gap under various conditions. Lower voltages may not reliably ignite the mixture, especially at high compression. This range balances performance and coil insulation capabilities. https://en.wikipedia.org/wiki/Ignition_coil
How does a coil-on-plug (COP) ignition system improve over a distributor-based system?
Requires no electronic control unit
Eliminates high-tension spark plug wires reducing energy loss
Reduces the number of spark plugs needed
Uses a single coil for all cylinders
Coil-on-plug systems mount a coil directly on each spark plug, eliminating high-tension leads that can leak energy and degrade over time. This setup delivers maximum voltage directly to each plug and allows precise control of timing. It also simplifies packaging and diagnostics. https://en.wikipedia.org/wiki/Coil-on-plug_ignition
In a wasted spark ignition system, how many sparks occur per two crankshaft revolutions for a four-cylinder engine?
4
2
8
6
In a wasted spark system on a four-cylinder engine, each coil fires twice every two revolutions of the crankshaft - once for the cylinder on its compression stroke and once (the 'wasted' spark) on the paired cylinder's exhaust stroke. This results in four sparks per two revolutions. https://en.wikipedia.org/wiki/Wasted_spark_ignition
Which component is primarily responsible for adjusting ignition timing based on engine load and speed?
Ignition coil
Throttle body
Distributor vacuum advance
Engine control unit (ECU)
Modern ignition timing is controlled by the Engine Control Unit (ECU), which uses data from various sensors (crank, cam, MAP, knock, etc.) to advance or retard timing for optimal performance and emissions. Older systems used mechanical and vacuum advances, but ECUs offer precise, dynamic control. https://en.wikipedia.org/wiki/Engine_control_unit
What is the purpose of the knock sensor in relation to ignition timing?
To control idle speed
To detect detonation and allow the ECU to retard timing
To monitor crankshaft position
To measure air-fuel ratio
The knock sensor detects engine knock or detonation by sensing vibrations caused by abnormal combustion. When knock is detected, the ECU retards ignition timing to prevent engine damage and maintain efficiency. This closed-loop control improves performance and protects the engine. https://en.wikipedia.org/wiki/Knock_sensor
Which part of a spark plug code typically indicates its heat range?
The numeric portion of the code
The thread diameter code
The electrode material symbol
The letter prefix
Most spark plug manufacturers incorporate a number in the part code that represents the heat range - the ability to dissipate heat. Higher numbers generally indicate a colder plug, while lower numbers are hotter. Always consult the manufacturer's cross-reference for precise interpretation. https://en.wikipedia.org/wiki/Spark_plug
What is the primary effect of increasing the spark plug gap?
Decreases spark duration
Requires higher voltage but can produce a stronger spark
Advances ignition timing
Lowers the voltage needed for ignition
A larger spark plug gap demands more voltage from the ignition coil to jump the gap, but when it does, the spark can be more energetic and improve combustion. Too large a gap may lead to misfires if the coil cannot generate sufficient voltage. Always stay within manufacturer specifications. https://en.wikipedia.org/wiki/Spark_plug_gap
Which ignition coil parameter is most likely to be affected by a shorted primary winding?
Number of secondary turns
Spark plug gap
Primary resistance
Secondary voltage output
A short in the primary winding of an ignition coil alters its resistance to a value outside the normal specification. Measuring unusually low or high primary resistance indicates internal shorts or opens. Secondary turns and spark plug gap are separate parameters. https://en.wikipedia.org/wiki/Ignition_coil#Circuit_identification
A technician measures 1.2 ohms on the primary winding of an ignition coil. Is this within typical specifications?
It indicates a short in the secondary circuit
No, primary should be above 5 ?
Yes, most coils specify 0.5 - 2.0 ? on the primary
No, primary should be below 0.5 ?
Typical ignition coil primary resistance ranges from about 0.5 to 2.0 ohms depending on design. A reading of 1.2 ohms falls comfortably within that range, suggesting the coil's primary winding is healthy. Values far outside this range indicate internal faults. https://en.wikipedia.org/wiki/Ignition_coil
What is the key advantage of High-Energy Ignition (HEI) systems compared to conventional ignition systems?
They eliminate the need for spark plugs
They reduce voltage output to the spark plug
They use mechanical timing advance only
They deliver a hotter, more consistent spark at wider plug gaps
HEI systems use integrated ignition coils and improved electronics to generate a more powerful spark capable of jumping wider gaps. This enhances combustion efficiency and cold-start performance. Conventional systems typically produce lower-energy sparks. https://en.wikipedia.org/wiki/High_energy_ignition
On an oscilloscope primary coil waveform, which feature indicates a weak ignition coil?
A noticeably lower primary current ramp (slope)
A consistent spark line
A sharp secondary voltage spike
A wider dwell plateau
A weak coil typically cannot build as much magnetic field, resulting in a lower slope on the primary current ramp during dwell. This reduced current indicates less stored energy for the spark. Other waveform markers relate to timing or discharge but not primary strength. https://www.auteltech.com/8/10/signs-of-ignition-coil-failure
For a V6 90° engine, which firing order is commonly used?
1-5-3-6-2-4
1-4-2-5-3-6
2-4-6-1-3-5
1-2-3-4-5-6
Many 90° V6 engines employ the 1-4-2-5-3-6 firing order to optimize balance and reduce vibration. This sequence spaces power strokes evenly for smoother operation. Variations exist, but this order is widely used. https://en.wikipedia.org/wiki/Firing_order#V6
What effect does excessive dwell time have on ignition coil performance?
It increases spark energy indefinitely
It has no impact if voltage is stable
It advances ignition timing automatically
It saturates the coil, reducing spark energy and overheating it
Excessive dwell time can cause the coil's magnetic core to saturate, preventing additional energy from being stored and leading to overheating. This reduces spark energy and can damage the coil over time. Proper dwell control prevents these issues. https://www.boschautoparts.com/en/auto/reference-guides/ignition-coils
Why is thermal management important in coil-on-plug ignition modules?
To reduce dwell angle automatically
To increase spark voltage beyond design limits
To eliminate the need for spark gap checks
To prevent overheating that degrades coil insulation and electronics
Coil-on-plug modules are mounted directly on hot engine components and generate heat during operation. Proper thermal management prevents coil insulation breakdown and electronics failure, ensuring reliable spark generation. Insufficient cooling leads to early module failure. https://www.premierautoelectric.com/ignition-coils/coil-on-plug
In multiple-spark discharge systems, what is the benefit of delivering several sparks during the combustion stroke?
Eliminates the need for a crankshaft sensor
Improves cold-start ignition and ensures complete combustion
Reduces coil primary current draw
Advances timing automatically
Multiple-spark discharge systems deliver a series of lower-energy sparks instead of one high-intensity spark. This technique improves ignition reliability under cold, lean, or high-emission conditions and promotes more complete combustion. It's especially beneficial in modern lean-burn engines. https://en.wikipedia.org/wiki/Ignition_system#Multiple_spark_discharge
When battery voltage drops significantly, how does the ECU modify the dwell angle to maintain spark energy?
It increases the dwell angle to allow more charge time
It leaves dwell unchanged regardless of voltage
It decreases the dwell angle to protect the coil
It disables unused coils to save power
ECUs monitor battery voltage and adjust dwell angle dynamically. When voltage drops, the ECU lengthens dwell to compensate and store sufficient magnetic energy in the coil. This closed-loop compensation maintains spark energy and prevents misfires under low-voltage conditions. https://www.autoservicetool.com/ignition-coil-dwell-compensation
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Study Outcomes

  1. Identify Ignition System Components -

    Recognize which of the following is part of the ignition system by distinguishing components such as spark plugs, coils, and distributors. This outcome ensures you can pinpoint critical parts that enable engine start-up.

  2. Describe Ignition System Function -

    Explain what function is performed by the ignition system, including how it generates and directs spark to the engine cylinders. You will gain clarity on the system's role in fuel combustion and overall engine operation.

  3. Differentiate Ignition Coil Types -

    Compare various ignition coil types, from traditional coil-and-distributor setups to modern coil-on-plug designs. This helps you understand the advantages and applications of each coil type in different engine configurations.

  4. Determine Correct Firing Order -

    Apply knowledge of engine layouts to establish the proper firing order for different cylinder arrangements. By mastering firing sequences, you'll ensure smooth engine performance and troubleshooting efficiency.

  5. Apply Spark Generation Methods -

    Use quiz scenarios to practice methods of spark generation and verify how spark timing influences engine efficiency. This outcome reinforces practical skills for tuning and diagnosing ignition-related issues.

Cheat Sheet

  1. Core Ignition Components -

    When prepping for an ignition test, identify that spark plugs, the ignition coil, and the ignition switch are fundamental. A quick mnemonic is "SIS": Spark plug, Ignition coil, Switch. Spotting these helps answer questions like "which of the following is part of the ignition system" in seconds.

  2. Spark Generation Basics -

    The ignition coil steps up 12 V battery power to 20 - 40 kV using Faraday's law (V=−N·ΔΦ/Δt), creating the high voltage needed for a spark. Understanding this voltage transformation is crucial for acing coil function questions in your ignition test. Remember that a stronger spark yields more reliable combustion.

  3. Ignition Coil Types -

    Engineered in three main styles - single distributor coil, waste-spark coil pack, and coil-on-plug (COP) - each type offers unique performance benefits. A handy mnemonic is "DWC" to recall Distributor, Waste-spark, COP. Familiarity with these ignition coil types solidifies your mastery during quizzes and real-world diagnostics.

  4. Firing Order Essentials -

    Standard firing orders (e.g., 1-3-4-2 for inline-4 and 1-8-4-3-6-5-7-2 for V8) ensure smooth power delivery and engine balance. Use the phrase "1-3-4-2 loves a four" to lock in the inline-4 sequence. Knowing firing order intimately helps you both troubleshoot misfires and excel on your ignition test.

  5. Primary System Function -

    In short, the ignition system's job is to convert low-voltage battery energy into a timed, high-voltage spark that ignites the air-fuel mixture, addressing "what function is performed by the ignition system." Precise timing (measured in degrees before top dead center, BTDC) maximizes efficiency and power. Mastering this concept is key to passing any professional-level exam.

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