Automotive Technology
7th Edition
ISBN: 9781337794213
Author: ERJAVEC, Jack.
Publisher: Cengage,
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Chapter 15, Problem 6ASRQ
To determine
The technician with the correct argument about the relays.
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Which of the following is the purpose of fail-safe circuits?
O Fail-safe circuits are designed to protect electric motors against voltage surge
O All of these are true
O Fail-safe circuits are designed to provide overload protection for system components
O Fail-safe circuits are designed to maintain constant current in electric motor coils
What happens when the low-voltage current flow in the coil primary winding is interrupted by the switching device?
The primary winding delivers a high-voltage spark to the plugs.
The magnetic field in the coil primary builds.
The secondary voltage drops to zero volts.
High voltage is induced in the secondary windin
hile discussing NTC thermistors; Technician A says that some systems use this type of thermistor as a protection device. Technician B says that when there is high current in a circuit, the resistance of the thermistor increases and causes a decrease in current flow. Who is correct?
Chapter 15 Solutions
Automotive Technology
Ch. 15 - What is represented by the E, I, and R in the...Ch. 15 - What are the two types of wires and which is the...Ch. 15 - Define voltage drop.Ch. 15 - Define circuit protection.Ch. 15 - Prob. 5SACh. 15 - What is the difference between voltage and...Ch. 15 - What is an SPST switch?Ch. 15 - Solve the parallel circuit for total circuit...Ch. 15 - Prob. 1TFCh. 15 - True or False? An open switch is one that can flow...
Ch. 15 - Which type of resistor is commonly used in...Ch. 15 - Prob. 2MCCh. 15 - Prob. 3MCCh. 15 - Prob. 4MCCh. 15 - Prob. 5MCCh. 15 - Prob. 1ASRQCh. 15 - Prob. 2ASRQCh. 15 - While discussing the circuit shown in Figure...Ch. 15 - While discussing electrical grounds: Technician A...Ch. 15 - Prob. 5ASRQCh. 15 - Prob. 6ASRQCh. 15 - While discussing copper wire: Technician A says...Ch. 15 - While discussing current flow: Technician A says...Ch. 15 - While discussing voltage Technician A says that...Ch. 15 - While discussing the AWG system: Technician A says...
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- Wiring harnesses are typically shielded by plastic conduit. What color is normally used to shield SRS- related wiring? Black Green c. Yellow d. Orangearrow_forwardAn open winding in an electric motor means that A. the winding is making contact with the motor frame. B. one winding is making contact with another winding. C. a wire in one winding is broken. D. the centrifugal switch to the start winding is open.arrow_forwardWhile discussing electrical grounds: Technician A says that a component may be grounded through its mounting to a major metal part. Technician B says that some components must be grounded by connecting its positive terminal to a metal section of the frame. Who is correct? Technician A Technician B Both A and B Neither A nor Barrow_forward
- While discussing copper wire: Technician A says that if the length of wire is doubled, the resistance between the wire ends is doubled. Technician B says that if the diameter of a wire is doubled, the resistance between the wire ends is doubled. Who is correct? Technician A Technician B Both A and B Neither A nor Barrow_forwardWhile discussing current flow: Technician A says that current results from electrons being attracted to protons. Technician B says that for practical purposes, it is best to remember that current flows from a point of higher potential to a point of lower potential. Who is correct? Technician A Technician B Both A and B Neither A nor Barrow_forwardTrue or False? A zero reading on an ohmmeter means the circuit or component is open.arrow_forward
- Technician A says that a 12-volt light bulb that draws 12 amps has a power output of 1 watt. Technician B says that a motor that has 1 ohm of resistance has a power rating of 144 watts if it is connected to a 12-volt battery. Who is correct? Expert Answerarrow_forwardWhich type of resistor is commonly used in automotive circuits? a. Fixed value b. Stepped c. Variable d. All of the abovearrow_forwardTrue or False? An open switch is one that can flow current through it.arrow_forward
- There is a short circuit in an electric motor winding when A. there is an adverse weather condition. B. a winding conductor is worn bare and touches anotherpart of the conductor that is also bare. C. there is a defect in the centrifugal start switch. D. the motor will not start.arrow_forwardTrue or False? Coil secondary resistance is typically very low, less than 1 ohm.arrow_forwardWhere is the heat range code indicated on a spark plug? the steel shell on the porcelain insulator on the terminal on the electrodearrow_forward
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