Automotive Technology: Principles, Diagnosis, And Service (6th Edition) (halderman Automotive Series)
6th Edition
ISBN: 9780135257272
Author: James D. Halderman
Publisher: PEARSON
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Question
Chapter 18, Problem 3CQ
To determine
The component that controls the coolant flow through the radiator.
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to run
d. both a and b
44. Ifa thermostatic expansion valve's thermal bulb came loose from the suction line at the outlet of the
evaporator, whích of the following could result?
The bulb pressure would increase and the c.
thermostatic expansion valve would
open.
b. The superheat in the evaporator would
decrease.
a.
Liquid refrigerant would flow back to the
compressor.
d.
All of the above are correct.
45. If the thermal bulb assembly develops a leak, what will occur?
All of the system's refrigerant will leak
a.
The valve will open to allow more
c.
refrigerant to flow.
d. It will have no effect on system
operation.
out.
b. The bulb pressure will reduce and the
valve will close.
46. The purpose of an externally equalized thermostatic expansion valve is to
compensate for excessive evaporator
pressure drop
b. allow system to equalize faster
a.
prevent the expansion valve from
frosting up
d.
c.
allow refrigerant to expand in the
compressor
47. The primary function of an expansion device is…
The cooling anticipator is wiredA. in parallel with the cooling contact.B. next to the liquid line.C. in series with the cooling contact.D. inside the indoor unit.
What is the primary purpose of a thermostat
jiggle valve?
Select one:
a. To act as a bypass for coolant
b. To relieve water pump pressure
under load
c. To ensure coolant flows the correct
direction
d. To aid in bleeding air from the
system
Chapter 18 Solutions
Automotive Technology: Principles, Diagnosis, And Service (6th Edition) (halderman Automotive Series)
Ch. 18 - How is the angle between power strokes determined?Ch. 18 - What brands of vehicles use horizontally opposed...Ch. 18 - Prob. 3RQCh. 18 - If an engine at sea level produces 100 hp, how...Ch. 18 - What is the definition of horsepower?Ch. 18 - The chemical energy in fuel is converted to heat...Ch. 18 - An SOHC V-8 engine has how many camshafts? a. One...Ch. 18 - Prob. 3CQCh. 18 - Torque is expressed in units of _______________....Ch. 18 - Horsepower is expressed in units of...
Ch. 18 - A normally aspirated automobile engine loses about...Ch. 18 - One cylinder of an automotive four-stroke cycle...Ch. 18 - How many rotations of the crankshaft are required...Ch. 18 - A rotating force is called ________________. a....Ch. 18 - Technician A says that a crankshaft determines the...
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- While discussing the operation of air-conditioning systems: Technician A says that in order for the refrigerant to release heat, it must be at a low temperature and pressure. Technician B says that in order for the refrigerant to absorb heat, it must be at a high temperature and pressure. Who is correct? Technician A Technician B Both A and B Neither A nor Barrow_forwardQuestion1. If an air conditioning system has three independent zones, how many space thermostats will the system have? Question 2. A technician is traversing a duct and obtains the following 8 velocity: 500fpm, 400fpm, 375fpm,625fpm,275fpm,360fpm,450fpm,and 575fpm. What is the velocity value that can be used for the system calculations?arrow_forward8. What would be done to increase the compressor speed on a belt-driven compressor? A. Decrease drive pulley size B. Increase drive pulley size C. Increase driven pulley size 13. What lubricates the refrigeration compressor? A. Refrigerant B. Moisture C. Desiccants D. Oil D. Both A andC 9. Describe the reciprocating compressor piston, rod, crankshaft, valves, valve plate, head, shaft seal, internal motor overload device, pilot-duty motor overload de- vice, and coupling. 10. Name two things in the design of a reciprocating com- pressor that control the efficiency of the compressor. А. 14. What can the service technician do to keep the refrig- eration system operating at peak efficiency? 15. List the main advantage that a discus compressor's valve plate design has over a conventional piston-type В. 11. At what speeds in rpm does a hermetic compressor nor- mally turn? A. 1750 В. 3450 C. 4500 D. Both A and B 12. What effect does a slight amount of liquid refrigerant have on a compressor…arrow_forward
- If the compressor and condenser fan motor will not operate but the indoor fan motor is operating, what would be the probable cause of the malfunction? a. Bad contactor coil b. Bad thermostat c. Bad condenser fan motor d. Bad compressorarrow_forwardWhat is the total length of this furnace and air-conditioning system?arrow_forwardWhich component is primarily responsible for the pressure in a cooling system? Select one: a. The thermostat b. The water pump c. The radiator cap d. The surge tankarrow_forward
- Advantages of pressurized cooling systemarrow_forwardWhat should be done to prevent excessive deposits and buildup within the cooling system? Select one: a. Replace the coolant filter often b. Flush or replace coolant every year c. Use cold tap water when mixing antifreeze and water d. Use distilled water when mixing antifreeze and waterarrow_forwardNot all HVAC system are required to seal and insulated. Which ducts are not required to be sealed and insulated? A. Exposed ducts on roof B. Aluminum ducts in either an attic or crawl space C. Supply and or return ducts located in the conditioned space D. Return ducts located in a ventilated attic spacearrow_forward
- When assembling refrigerant lines on the job, the tubing should be kept _______. Select the answer below: A. Clean B. All of the above C. Free of kinks D. Dryarrow_forwardAn overheating vehicle is being discussed. Technician A states that the vehicle may be overheating becuase the heater control valve is stuck closed. Technician B states that the vehicle may be overheating because the PCM in not energizing the cooling fan relay. Who is correct?arrow_forwardWhich of the following is most responsible for providing or blocking heat to the passenger compartment? Select one: a. The heater control valve b. The water pump c. The thermostat d. The radiator caparrow_forward
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