Deck 20: Coolant

Question 1

Coolant is water and ________.

A)Methanol
B)Kerosene
C)Ethylene glycol
D)Glycerin

Answer 1

Ethylene glycol

Question 2

As the percentage of antifreeze in the coolant increases, ________.

A)The boiling point decreases
B)The freeze point decreases (up to a point)
C)The heat transfer increases
D)All of the above occurs

Answer 2

The freeze point decreases (up to a point)

Question 3

Adding a chemical to make ethylene glycol bitter to the taste is called ________.

A)Electrolysis
B)Passivation
C)Embittered
D)Refractometer

Answer 3

Embittered

Question 4

Asian red coolant is what type?

A)IAT
B)HOAT
C)OAT
D)PHOAT

Question 5

DEX-COOL is what type of coolant?

A)IAT
B)HOAT
C)PHOAT
D)OAT

Question 6

PHOAT coolant is what color?

A)Red
B)Orange
C)Blue
D)Dark Green

Question 7

DEX-COOL is ________.

A)Propylene glycol
B)Silicate and phosphate free
C)Ethylene glycol
D)Both B and C

Question 8

Two technicians are discussing testing coolant for proper pH. Technician A says that coolant has a pH above 7 when new and becomes lower with use in an engine. Technician B says that OAT and HOAT coolants have a lower pH when new compared to the old green IAT coolant. Which technician is correct?

A)Technician A only
B)Technician B only
C)Both technicians A and B
D)Neither technician A nor B

Question 9

Reusing old coolant is generally not approved by vehicle manufacturers, with the exception of ________.

A)Chrysler
B)Ford
C)Mercedes
D)General Motors

Question 10

A voltmeter was used to check the coolant and a reading of 0.2 volt with the engine off was measured. A reading of 0.8 volt was measured with the engine running and all electrical accessories turned on. Technician A says that the coolant should be flushed to solve the galvanic activity. Technician B says that the ground wires and connections should be inspected and repaired to solve the electrolysis problem. Which technician is correct?

A)Technician A only
B)Technician B only
C)Both technicians A and B
D)Neither technician A nor B

Question 11

DEX-COOL coolant is composed mostly of which of these chemicals?

A)Alcohol
B)Propylene glycol
C)Ethylene glycol
D)Methanol

Question 12

Technician A says that used coolant should never be recycled. Technician B says that coolant types that include DEX-COOL are ethylene glycol-based. Who is right?

A)Technician A only
B)Technician B only
C)Both technicians A and B
D)Neither technician A nor B

Question 13

Which mixture of coolant/water solution below is recommended for general automotive use?

A)30/70
B)50/50
C)70/30
D)100/0

Question 14

All these are functions of coolant EXCEPT ________.

A)Cooling system lubricant
B)Rust inhibitor
C)Corrosion inhibitor
D)All of these are functions of coolant

Question 15

Technician A says that galvanic activity is the result of a poor ground connection. Technician B says that electrolysis can occur with a poor ground connection. Which technician is correct?

A)Technician A only
B)Technician B only
C)Both technicians A and B
D)Neither technician A nor B

Question 16

A normal reading when testing for electrolysis in the coolant is ________.

A)At least .5 V
B)More than .5 V
C)Less than 300 mV
D)5 V or more

Question 17

A normal reading when testing coolant for galvanic activity is ________.

A)More than .5 V
B)At least .5 V
C)5 V or more
D)Less than 200 mV

Question 18

Testing for galvanic activity is done with the coolant ________ and the engine ________.

A)Cool; not running
B)Warm; engine not running
C)Cool; running
D)Warm; running

Question 19

Technician A says that OAT type coolant should be changed every 2 years. Technician B says that IAT type coolant should be changed every 2 years. Which technician is correct?

A)Technician A only
B)Technician B only
C)Both technicians A and B
D)Neither technician A nor B

Question 20

Some manufacturers recommend using premixed coolant only in their vehicles.

Question 21

Using 100% coolant in the cooling system improves the cooling capacity of the system.

Question 22

A late model vehicle's coolant is being tested. The refractometer reading shows a freezing point of ________.

A)-34° F
B)-5° F
C)-14° F
D)None of these