Deck 23: Automotive Hoses

Question 1

2)Radiator hoses are designed to have a burst strength of between five and six times the working pressure of the cooling system.

Answer 1

True

Question 2

16)____________________ is a process that cures rubber and causes it to set in a predetermined shape.

Answer 2

Vulcanizing

Question 3

15)Which of the following statements is LEAST-Likely true?

A) Fuel hose must always be routed so that it is at least 4" (100 mm) away from any part of the exhaust system.
B) Fuel injection lines do not maintain pressure when the engine is off.
C) Catalytic converters run hotter than the rest of the exhaust system.
D) Fuel hoses should not be any closer than 10" (284 mm) from a catalytic converter.

Answer 3

B

Question 4

11)Technician A says that you should not use fuel hose for an application in which hot oil will be used, such as for a transmission cooler line. Technician B says that it does not make a difference whether the oil is hot or cold. Who is correct?

A) A only
B) B only
C) Both A and B
D) Neither A nor B

Question 5

1)Reinforced rubber is used for vacuum hose, windshield washer hose, and drain hose.

Question 6

18)The rubber outside layer of brake hose can crack from ____________________ in the air.

Question 7

10)The hose that is MOST-Likely to have the inside be resistant to damage from ethanol and methanol fuels is the:

A) fuel hose
B) universal hose
C) by-pass hose
D) formable hose

Question 8

14)____ used as original equipment by some manufacturers for cooling system hoses are not used for most fuel system applications, although they are supplied with replacement in-line fuel filters on older engines with carburetors.

A) Screw tower clamps
B) Spring clamps
C) Hoses
D) Gears

Question 9

6)All of the following statements are correct EXCEPT:

A) using the wrong hose can result in a fire or damage to a major component.
B) common fuel hose sizes are 5/16" and 3/8" for pressure hoses and 1/4" for return lines.
C) common heater hose sizes are 7/8" and 1/4".
D) hoses are sized according to their inside diameter.

Question 10

20)A(n) ____________________ crimp was used with 3-barbed fittings on vintage R-12 refrigeration systems.

Question 11

5)The middle fabric layers of most brake hoses have three plies with a jacket on the outside layer to protect the plies.

Question 12

8)The MOST-Likely hose to have a metal wire molded within is the:

A) universal hose
B) fuel hose
C) by-pass hose
D) formable hose

Question 13

12)All of the following statements are true EXCEPT:

A) a replacement hose to a power booster must be reinforced and fuel resistant.
B) fuel vapors can damage a power booster diaphragm.
C) some hoses have an inline filter that prevents fuel from entering the power booster during a misfire in the intake manifold.
D) because safety is involved, federal motor vehicle standards require brake hoses to have a burst strength of at least 3,000 psi.

Question 14

3)Over 90% of replacement radiator hoses are molded hoses.

Question 15

17)____________________ hose can be clamped on one end and then bent until it assumes the desired shape.

Question 16

13)Technician A says that when a compression fitting with a copper washer has been tightened, the hose can no longer rotate. Technician B says that the compression fitting must be installed before the other end of the hose is installed. Who is correct?

A) A only
B) B only
C) Both A and B
D) Neither A nor B

Question 17

9)For safety reasons, fuel hose must be tough enough to resist ____ in case it rubs or chafes against another part.

A) abrasion
B) radiation
C) compression
D) vulcanizing

Question 18

7)Which of the following is the LEAST-Likely place to find a hose?

A) Radiator
B) Heater
C) Brake system
D) Circuit

Question 19

19)____________________ clamps are designed so that they will not cut into a hose.

Question 20

4)Bending conventional hose will cause it to kink, restricting water flow.

Question 21

24)What is the process involved in replacing a coolant hose?

Question 22

25)What factors should you bear in mind when installing a new section of hose?

Question 23

23)How would you check for ECD damage?

Question 24

21)What is the difference between a thermostat by-pass hose and a carburetor fuel hose?

Question 25

22)Power steering systems usually have two hoses: one for pressure and the other for return. Discuss the differences between the two.