AUT 125 - Chapters 20, 21, & 62 Mid-term
Exam QUESTIONS AND ANSWERS
1. A late model vehicle's coolant is being examined. The refractometer analyzing indicates
a freezing point of ____-14* F - ANSWER-_________.
A. -five* F
b. -34* F
c. -14* F
d. None of these
2. The regular running temperature (coolant temperature) of an engine geared up with a
195°F thermostat is ____________.
A. One hundred seventy five°F to 195°F
b. 185°F to 205°F
c. 175°F to 215°F195°F to 215°F - ANSWER-
d. 195°F to 215°F
3. -Which mixture of coolant/water answer beneath is usually recommended for standard
car use?
A. 30/70
b. A hundred/zero
c. 70/3050/50 - ANSWER
d. 50/50
4. A five ribbed serpentine belt ought to be tensioned at about ____________.
A. 75 to one hundred Ibs.
B. A hundred and fifty Ibs.
C. 45 to 60 Ibs.
D. None of those seventy five to one hundred Ibs. - ANSWER-
5. The upper radiator hose collapses when the engine cools. What is the maximum
probably reason?
A. A faulty thermostat
b. A faulty upper radiator hose
c. The spring is lacking from the top radiator hose which is used to preserve it from
collapsing
d. A faulty pressure cap A defective stress cap - ANSWER-
6. The use of a coolant restoration machine is beneficial in preventing _____________
from entering the cooling gadget.
A. Hose residue
b. Immoderate vibrations
c. Oil
d. Air air - ANSWER-
, 7. Which of the following can result from evaporator freeze-up?
A. The air-conditioning device produces little or no cooling.
B. The refrigerant won't nicely evaporate.
C. Air isn't always drawn over the fins
d. All of the above.
8. All of these are features of coolant - ANSWER-All these are features of coolant EXCEPT
_____________.
A. Cooling device lubricant-
b. Corrosion inhibitor
c. Rust inhibitor
d. All of these are features of coolant All of the above. - ANSWER
9. All of these are HVAC subsystems - ANSWER-Which of the following is NOT a
subsystem in a present day automobile HVAC device?
A. AC controls
b. Refrigeration device
c. Cooling machine
d. All of those are HVAC subsystems
10.Which of the subsequent is NOT a characteristic of the expansion valve?
A. Allow liquid refrigerant to return to the compressor
b. Prevent the evaporator from freezing
c. Meter refrigerant into the evaporator for max cooling
d. Provide the limit that separates the low aspect from the high facet Allow liquid
refrigerant to return to the compressor - ANSWER-
11.Most inflexible refrigerant traces are manufactured from ____________.
A. Aluminum
b. Titanium
c. Steel
d. Copper aluminum - ANSWER-
12.are pushed by the engine crankshaft or camshaft - ANSWER-Water pumps
____________.
A. Are driven with the aid of the engine crankshaft or camshaft
b. Most effective work at idle and the way speeds and are disengaged at better speeds
c. Use engine oil as a lubricant and coolant
d. Disengage all through freezing weather to prevent radiator failure
13.-Which this kind of areas is the water jacker?
A. A
b. B
c. C
d. D B - ANSWER
14.Which form of refrigerant hose is used with an R - 134a system?
A. Flexible, porous hose
b. Copper type hose
c. Rigid hose
d. Barrier hose Barrier hose - ANSWER-
Exam QUESTIONS AND ANSWERS
1. A late model vehicle's coolant is being examined. The refractometer analyzing indicates
a freezing point of ____-14* F - ANSWER-_________.
A. -five* F
b. -34* F
c. -14* F
d. None of these
2. The regular running temperature (coolant temperature) of an engine geared up with a
195°F thermostat is ____________.
A. One hundred seventy five°F to 195°F
b. 185°F to 205°F
c. 175°F to 215°F195°F to 215°F - ANSWER-
d. 195°F to 215°F
3. -Which mixture of coolant/water answer beneath is usually recommended for standard
car use?
A. 30/70
b. A hundred/zero
c. 70/3050/50 - ANSWER
d. 50/50
4. A five ribbed serpentine belt ought to be tensioned at about ____________.
A. 75 to one hundred Ibs.
B. A hundred and fifty Ibs.
C. 45 to 60 Ibs.
D. None of those seventy five to one hundred Ibs. - ANSWER-
5. The upper radiator hose collapses when the engine cools. What is the maximum
probably reason?
A. A faulty thermostat
b. A faulty upper radiator hose
c. The spring is lacking from the top radiator hose which is used to preserve it from
collapsing
d. A faulty pressure cap A defective stress cap - ANSWER-
6. The use of a coolant restoration machine is beneficial in preventing _____________
from entering the cooling gadget.
A. Hose residue
b. Immoderate vibrations
c. Oil
d. Air air - ANSWER-
, 7. Which of the following can result from evaporator freeze-up?
A. The air-conditioning device produces little or no cooling.
B. The refrigerant won't nicely evaporate.
C. Air isn't always drawn over the fins
d. All of the above.
8. All of these are features of coolant - ANSWER-All these are features of coolant EXCEPT
_____________.
A. Cooling device lubricant-
b. Corrosion inhibitor
c. Rust inhibitor
d. All of these are features of coolant All of the above. - ANSWER
9. All of these are HVAC subsystems - ANSWER-Which of the following is NOT a
subsystem in a present day automobile HVAC device?
A. AC controls
b. Refrigeration device
c. Cooling machine
d. All of those are HVAC subsystems
10.Which of the subsequent is NOT a characteristic of the expansion valve?
A. Allow liquid refrigerant to return to the compressor
b. Prevent the evaporator from freezing
c. Meter refrigerant into the evaporator for max cooling
d. Provide the limit that separates the low aspect from the high facet Allow liquid
refrigerant to return to the compressor - ANSWER-
11.Most inflexible refrigerant traces are manufactured from ____________.
A. Aluminum
b. Titanium
c. Steel
d. Copper aluminum - ANSWER-
12.are pushed by the engine crankshaft or camshaft - ANSWER-Water pumps
____________.
A. Are driven with the aid of the engine crankshaft or camshaft
b. Most effective work at idle and the way speeds and are disengaged at better speeds
c. Use engine oil as a lubricant and coolant
d. Disengage all through freezing weather to prevent radiator failure
13.-Which this kind of areas is the water jacker?
A. A
b. B
c. C
d. D B - ANSWER
14.Which form of refrigerant hose is used with an R - 134a system?
A. Flexible, porous hose
b. Copper type hose
c. Rigid hose
d. Barrier hose Barrier hose - ANSWER-
