Chapter 20 Coolant
Quiz by Matt Lobdell
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- Q1
Coolant is water and ________.
glycerin
methanol
kerosene
ethylene glycol
30s - Q2
As the percentage of antifreeze in the coolant increases, ________.
the boiling point decreases
the heat transfer increases
the freeze point decreases (up to a point)
All of the above occurs
30s - Q3
Adding a chemical to make ethylene glycol coolant bitter to the taste is called ________.
refractometer
electrolysis
passivation
embittered
30s - Q4
Asian red coolant is what type?
IAT
HOAT
OAT
PHOAT
30s - Q5
PHOAT coolant is what color?
Orange
Dark Green
Blue
Red
30s - Q6
DEX-COOL is ________.
Propylene glycol
Ethylene glycol
Silicate and phosphate free
Both B and C
30s - Q7
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?
Technician A only
Technician B only
Both technicians
Neither technician
30s - Q8
What percentage of coolant is water?
10%
80%
30%
50%
30s - Q9
Reusing old coolant is generally not approved by vehicle manufacturers, with the exception of ________.
Ford
General Motors
Mercedes
Chrysler
30s - Q10
A voltmeter was used to check the coolant and a reading of 0.2 volt with the engine off was measured. A reading of 0.8volt 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?
Technician A only
Technician B only
Both technicians
Neither technician
30s - Q11
DEX-COOL coolant is composed mostly of which of these chemicals?
Propylene glycol
Ethylene glycol
Alcohol
Methanol
30s - Q12
Which of the following antifreeze/water mix has the lowest freeze point?
Pure water
Pure antifreeze
60% antifreeze/40% water
50/50 mixture
30s - Q13
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?
Technician A only
Technician B only
Both technicians
Neither technician
30s - Q14
DEX-COOL is what type of coolant?
IAT
OAT
PHOAT
HOAT
30s - Q15
Which mixture of coolant/water solution below is recommended for general automotive use?
30/70
70/30
100/0
50/50
30s