Automotive Technology
7th Edition
ISBN: 9781337794213
Author: ERJAVEC, Jack.
Publisher: Cengage,
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Textbook Question
Chapter 54, Problem 5MC
Which of the following is electrically connected in series with the compressor electromagnetic clutch?
- Ambient temperature switch
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The A/C compressor cycles rapidly, and air coming from the vents is only slightly cool. Technician A says the problem could be a low refrigerant charge. Technician B says the problem could be a defective thermostatic switch. Who is right?
Group of answer choices
Technician A
Technician B
Both A and B
Neither A nor B
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Which of the following statements is not true?
A direct acting PRV:
Is complex in construction, therefore can malfunction if a very small dirt gets trapped inside the valve, which may result in safety hazard
Offers uneven flow
Does not provide precise pressure control
Causes more wastage of HP compared to a compound one
Which of the following basic system components has the primary function of removing the heat of compression from the air?
Receiver
Relief valve
Pressure regulator
Dryer
Aftercooler
Which of the following statements is true?
A single acting cylinder may have two ports at two different ends and pressurized fluid can be directed to both of them
A single acting cylinder with two ports will can be used as a double acting cylinder
A single acting cylinder may have two ports at two different ends but into only one of the ports pressurized fluid is being directed
A single acting cylinder…
If the main wire (coil) to the
distributor and the coil to the
switch are broken, replace them
and make sure the connections
are clean and tight relevant to
Ventilation system
Breaking system
Ignition system
Combustion system
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Which of the following is the
fouled of spark plug
Soot
All of the above
Oil
Over heated
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Chapter 54 Solutions
Automotive Technology
Ch. 54 - What is the amount of heat necessary to change the...Ch. 54 - Explain how an electromagnetic compressor clutch...Ch. 54 - Describe four ways in which the heater control...Ch. 54 - What is the purpose of the compressor clutch...Ch. 54 - What does change of state mean? And why is it...Ch. 54 - What state is the refrigerant in when it leaves...Ch. 54 - What causes condensed water to leak from the air...Ch. 54 - Explain why a diode may be wired into the compres...Ch. 54 - On which of the following laws of nature is the...Ch. 54 - Which of the following statements is true?...
Ch. 54 - Which of the following statements is false? The...Ch. 54 - Which of the following statements about PTC...Ch. 54 - Which of the following is electrically connected...Ch. 54 - Which of the following oils is used in an original...Ch. 54 - A heating system includes all of the following...Ch. 54 - Technician A says that a great amount of heat is...Ch. 54 - Technician A says that suction lines become very...Ch. 54 - While discussing the reasons the use of R-134a is...Ch. 54 - While discussing the reaction by a refrigerant to...Ch. 54 - While discussing solar sensors: Technician A says...Ch. 54 - While discussing the future use of CO2 as a...Ch. 54 - Technician A says that when the A7C system is off,...Ch. 54 - Technician A says that when the refrigerant is...Ch. 54 - A heater does not supply enough heat and the...Ch. 54 - While discussing relative humidity: Technician A...
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, mechanical-engineering and related others by exploring similar questions and additional content below.Similar questions
- What is the purpose of the compressor clutch thermostatic switch?arrow_forwardTrue or False: All reciprocating compressors start up fully loaded.arrow_forwardThe high-side pressure on a system with a cycling clutch and pressure cycling switch is 145 psi, the low-side pressure is 28 psi, and the ambient temperature is 78F. What do these gauge readings indicate? a. The system is undercharged. b. The system is overcharged. c. The system is normal. d. The evaporator pressure regulator is bad.arrow_forward
- The high-side pressure on a system with a cycling clutch and pressure cycling switch is 245 psi, the low- side pressure is 28 psi, and the ambient temperature is 78°F. What do these gauge readings indicate? The system is undercharged. The system is overcharged. The system is normal. The evaporator pressure regulator is bad.arrow_forwardWhich of the following features does an automatic combination gas valve have? A. Pressure regulator B. Pilot safety shutoff C. Redundant shutoff feature D. All of the abovearrow_forwardWhat is the purpose of the thermostatic switch in a cycling clutch system?arrow_forward
- An engine overheats in traffic but is fine when driving: Technician A says a faulty thermostat may be the cause. Technician B says the fan clutch could be the cause. Who is correct? a. Technician A b. Technician B c. Both A and B d. Neither A nor Barrow_forwardTrue or False: All gas valves snap open and closed.arrow_forwardWhich of the following is not a true statement about thermostats? Faulty thermostats are often the cause of air pockets in the coolant passages. They can also cause an increase in fuel consumption and poor engine performance. If the thermostat is stuck open, the coolant may not reach the desired temperature because it is cooled before it gets hot If a thermostat is stuck closed, coolant will not flow between the engine and radiator and the engine will quickly overheatarrow_forward
- In an AZC system, if the low-side pressure is lower than normal, which of the following is the least likely cause? A faulty metering device Poor airflow across the evaporator A restriction in the low side of the system The system being overcharged with refrigerantarrow_forwardTrue or False: When the control transformer is not working, the indoor fan will not run in the FAN ON position.arrow_forwardWhich of the following is true about a sequence valve? Sequence valves: A. Allow a check valve to override its normal operation B. Controls the rate of air flow in a pneumatic system C. Direct air flow to a different area in a circuit when actuated by pressure level D. Open and close the intet and outlet ports in a pneumatic systemarrow_forward
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