Questions and Answers
Which type of hybrid is capable of propelling the vehicle by just using the electric motor?
All of the following are characteristics of a hybrid electric vehicle (HEV) EXCEPT ________.
lower fuel economy
On a vehicle equipped with a belt-alternator-starter (BAS) hybrid system, the alternator is also used to ________.
Which type of hybrid electric design costs the least?
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The GM EV-1 was what type of vehicle?
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Which type of hybrid electric vehicle has idle stop operation?
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Electric motors are better than an internal combustion engine to propel a vehicle because ________.
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Technician A says that most hybrids use the series hybrid design. Technician B says that most hybrids have 42 volt batteries. Which technician is correct?
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About how fast does a motor-generator crank the internal combustion engine?
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Which type of hybrid uses 36 to 42 volts?
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The local interlock system on a hybrid vehicle detects when ________ have been removed from high-voltage circuits.
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Nickel metal hydride (NiMH) batteries can be damaged if exposed to temperatures higher than about ________.
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All of the following will shut off the high voltage to components and circuits EXCEPT ________.
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A CAT III certified DMM should be used whenever measuring high-voltage circuits or components. The CAT III rating relates to ________.
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If the engine is not running, technician A says that the high-voltage circuits are depowered. Technician B says that all high voltage wiring is orange in color. Which technician is correct?
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What routine service procedure could result in lower fuel economy, which the owner may discover?
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What can occur if a hybrid electric vehicle is pushed in the shop?
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Two technicians are discussing jump starting a hybrid electric vehicle. Technician A says that the high-voltage batteries can be jumped on all HEV models. Technician B says that the 12-volt auxiliary battery can be jumped using a conventional jump box or jumper cable. Which technician is correct?
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Rubber gloves should be worn whenever working on or near the high-voltage circuits or components of a hybrid electric vehicle. Technician A says that the rubber gloves should be rated at 1000 volts or higher. Technician B says that leather gloves should be worn over the high-voltage rubber gloves. Which technician is correct?
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Which statement is FALSE about high voltage wiring?
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Study Notes
Hybrid Vehicle Types
- Strong (full) hybrids can propel the vehicle solely using the electric motor.
- BAS (Belt-Alternator-Starter) hybrid systems use the alternator to start the engine.
- Medium hybrids operate with 36 to 42 volts, while mild hybrids utilize lower voltages.
Hybrid Electric Vehicle Characteristics
- HEVs produce fewer carbon emissions and are typically quieter than conventional vehicles.
- High voltages present safety concerns for technicians and mechanics.
- Fuel economy can be lower in some hybrids, contrary to common assumptions.
Battery and Voltage Systems
- Nickel metal hydride (NiMH) batteries are susceptible to damage when exposed to temperatures above 175°F.
- High-voltage circuits are rapidly disconnected through the local interlock system when covers or cables are removed.
- A CAT III certified DMM is essential for measuring high-voltage components, ensuring safety against high energy and voltage.
Maintenance and Service Procedures
- Incorrect engine oil viscosity and tire replacements can negatively affect fuel economy.
- Pushing a hybrid in a shop can generate high voltage from the motor/generator and potentially damage components.
- Rubber gloves rated for 1000 volts must be used while working with high-voltage systems; leather gloves can provide extra protection.
Electrical System and Jump-Starting
- Only the 12-volt auxiliary battery in hybrids can be jumped using conventional methods; high-voltage batteries cannot be jumped across all HEV models.
- The high-voltage wiring is electrically grounded to the vehicle’s body, enhancing safety by preventing shocks.
Technician Guidelines
- Technician A's assertion about high-voltage circuits being depowered when the engine is off is accurate, while Technician B incorrectly states that all high-voltage wiring is orange.
- Effective training and adherence to safety procedures are crucial in handling hybrid vehicle technologies and ensuring operational safety.
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Description
This quiz covers various types of hybrid vehicles, their characteristics, and the specifics of their battery and voltage systems. It also highlights maintenance and service procedures essential for working with hybrid electric vehicles. Test your knowledge of hybrid technology and its applications.
