Knowlege test

dagriff · 10-12-2006, 02:25 PM

Here's a test we came up with to test some the basic knowlege of applicants for an internal possition.
Anyone care to take a stab at it?
Might also be informative to those who don't know the answers!.

Interview Questions

1. List five things that shorten the life of battery.

2. Which of these statements is a not true conclusion from a battery load test?
a. The battery needs to be replaced if the voltage dropped below 9.6 volts while under a load but rose above 12.4 volts when the load was removed.
b. The battery should be charged then retested because it dropped below 9.6 volts and didn’t rise above 12.4 volts when the load was removed.
c. The battery should be charged then retested because it dropped below 9.6 volts and rose 12.4 volts when the load was removed.
d. The battery is good because the voltage dropped only to 10.3 volts while under load.

3. Technician A says baking soda can be used to neutralize battery corrosion.
Technician B says baking soda should be use to clean batteries. Who is correct?
a. Technician A
b. Technician B
c. Both A and B
d. Neither A nor B

4. What is the first step when removing an old battery?
a. Disconnect the ground cable
b. Remove the battery hold-down straps and cover
c. Inspect and clean the area
d. Remove the heat shield

5. Which of the following is not part of routine battery inspections and maintenance?
a. Visual check of the cables and terminals
b. Check the case for crack
c. Refill the electrolyte level with clean electrolyte
d. Clean all dirt from the battery case and tray

6. Technician A says battery straps should be used whenever a battery is lifted.
Technician B says when a battery is removed; the positive cable should be disconnected first. Who is correct?
a. Technician A
b. Technician B
c. Both A and B
d. Neither A nor B

7. Which of the following could cause low oil pressure during diagnostic checks?
a. Plugged oil pickup screen
b. Excessive oil dilution
c. Both a and b
d. Neither a nor b

8. In most automotive applications, the water pump is driven by the ______________.
a. Gear train
b. Belt
c. Crankshaft
d. Impeller

9. When must a thermostat be fully opened?
a. 30 F above its temperature rating
b. 30 F above or below its temperature rating
c. 200 F above the start to open temperature
d. 200 F below the start to open temperature

10. Most fan clutches offer a lot of drag when the engine is ______________.
a. Cold
b. Hot
c. Turned by hand
d. Both a and c

11. Technician A uses a test light to detect resistance. Technician B uses a jumper wire to test circuit breakers, relays , and lights. Who is correct?
a. Technician A
b. Technician B
c. Both A and B
d. Neither A nor B

12. What is the current in a 12-volt circuit with two-6ohm resistors connected in parallel?
a. 2 amps
b. 4amps
c. 6amps
d. 12amps

13. Which of the following statements is untrue?
a. A short causes increased current flow
b. An open causes unwanted voltage drops
c. High resistance problems cause increased current flow
d. Both opens and high resistance problems may cause a load not to work

14. Resistance is measured in ____________.
a. Current
b. Volts
c. Ohms
d. Watts

15. What type of circuit allows electricity to flow through its normal load?
a. Grounded
b. Open
c. Shorted
d. Closed

16. Technician A uses a digital volt/ohmmeter to test voltage. Technician B uses the same tool to test resistance. Who is correct?
a. Technician A
b. Technician B
c. Both A and B
d. Neither A and B

17. Which of the following conditions can be revealed by vacuum readings?
a. Leaking intake manifold
b. Uneven compression
c. Restricted exhausted system
d. All of the above

18. It is much easier to test current using a ammeter equipped with a (n) ___________.
a. Continuity tester
b. Carbon pile
c. Inductive pickup
d. Tachometer

19. Which exhaust gas from automobiles is considered dangerous?
a. Carbon dioxide
b. Carbon Monoxide
c. Nitrogen
d. Both a and b

20. Which of the following is not recommended to extinguish flammable liquid fires?
a. Foam
b. Carbon dioxide
c. Water
d. Dry chemical

21. Technician A uses compressed air to blow dirt from his clothes and hair. Technician B says this should be done outside. Who is correct?
a. Technician A
b. Technician B
c. Both A and B
d. Neither A and B

22. Protective gloves should be worn when ____________________.
a. Welding
b. Grinding metal
c. Working with caustic cleaning solutions
d. All of the above

23. Jack stands are used __________________.
a. With a jack or hoist
b. In place of a jack or hoist
c. Under sturdy chassis members
d. Both a and c

911mot · 911mot's Garage

1. List five things that shorten the life of battery.

Overcharging
Dirt
Excessive loads
Low electrolyte level
Topping up with tap water

2 d
3 d
4 a
5 b
6 a
7 c
8 c via b
9 a
10 b
11 d
12 a
13 a
14 c
15 d
16 c
17 a and c
18 c
19 d
20 c
21 d
22 d
23 a and c

Tell me I got at least one right....

2.7RACER · 10-12-2006, 06:39 PM

OK, here goes,

1. Over charging, low electrolyte, corroded connections, old brittle wire, using non-distilled water.
2. C
3. A
4. A
5. C
6. A
7. C
8. B
9. A
10. B
11. D
12. B
13. C
14. C
15. D
16. C
17. A
18. C
19. B
20. C
21. D
22. D
23. C
I did this without looking at other's answers. Not sure about baking soda, or blowing off with air hose. #2 is convoluted, took me the longest time. Probably missed a couple others. We'll see.

Jim Sims · 10-12-2006, 07:04 PM

"old brittle wire"?

vibration failure of internal battery connections?

Please elaborate.

It's a myth that copper loses any significant amount (that you would notice in an automotive application) of electrical conductivity due work hardening from vibration. What happens is the wires work harden and then fatigue fail by cracking and breaking. Break enough wires in such a manner and the effective conductivity of a cable or wire might go down where it would be noticed. Connection corrosion at the interfaces is the main cause of a resistance increase (seen as a voltage drop) in automotive wiring.

2.7RACER · 10-12-2006, 07:21 PM

Jim,
Hang it out and take the test.

Jim Sims · 10-12-2006, 07:38 PM

It wouldn't be fair as all the correct answers are already posted.

However; I'll add some to shortening battery life:
Heat (don't discard that heat shield, it's there for a reason), letting the battery discharge fully and sit and sulfide up (garage queen disease), subjecting the battery to excessive vibration and shock loads (from my farm and ranch experience), running the battery down then leaving it overnight so the electrolyte freezes and cracks the case (from my mis-spent adolescence in Montana) and finally peeing (only water on hand - in hand?) in a dry battery so you can get enough juice to get the truck started and get back to headquarters (farm and ranch again). Cheers, Jim

masraum · 08:22 PM

Basically I did pretty moderate, but I feel better that most of the questions that I missed were stuff that I wouldn't run into regularly while working on a car.

I also have a question. I wouldn't normally add electrolyte to a battery. I suppose to be correct you'd need to check the spec grav of the electrolyte before you add anything to determine if dist water or electrolyte needs to be added. The nice thing is that these days most batteries won't accept anything since most are sealed.

2.7RACER · 10-12-2006, 08:24 PM

Jim,
Never thought of peeing in my battery. I have used tap water.
So where's the answers?
I'm just a guy that enjoys his Porsche's and learning from this site.
Really didn't get into the tech side of Porsches until I retired.
I just can't seem to resist some of the puzzles presented here.

Jim Sims · 10-12-2006, 08:36 PM

1. see above
2. d; however 9.6 volt criteria only applies if the electrolyte is at 70F
3. c
4. a
5. d
6. a
7. c
8. c; by means of a belt, although lately BMW has begun driving them directly with an electric motor.
9. a
10. b
11. d
12. b; where's my Feynman lectures when I need them!
13. c
14. c
15. d
16. c
17. d
18. b
19. a; however my company lost a pumper on a catwalk over a salt water pit in an Arkansas CO2 tertiary recovery project oil field - smothered to death in the blanket of heavier than air CO2 that collected over the pit.
20. c
21. d
22. d
23. d

Do I get a "possition"?

Jim Sims · 10-12-2006, 08:41 PM

"Never thought of peeing in my battery."

It one has consumed a lot beer recently it works well enough for a start or two.

Also a good method to release fingers or hands frozen to a surface if you can get the projection right.

Oh, bad images from the past.

Jim Sims · 10-12-2006, 08:47 PM

"I also have a question."

My understanding is that electrolyte (sulphuric acid) is only added to a new battery that is supplied dry. To top off a cell of a battery in service add only distilled water.

randywebb · 10-12-2006, 09:18 PM

List five things that shorten the life of battery.

1. buckshot
2. dropping rebar so it hits both terminals at the same time
3. dropping the battery down a well
4. fire
5. dropping the battery into the ocean

911pcars · 09:23 PM

Additional battery answers:

1. A purposeful or inadvertant free fall from 5'. YMMV

2. Smoking around a charging battery (a pretty good method of inspecting said contents). Don't try this at home. There are better medical facilities at work.

3. Laying a 1/2" dr. breaker bar on the + and – posts. Run the bar through two small Cornish game hens before doing this and have a meal afterwards.

4. Dumping the contents of Arm-and-Hammer inside 1 or more battery cells. This also cleans the battery storage area so it doesn't rust.

5. Connecting another battery with jumper cables, + to – and + to –. This does nothing to the batteries but the vent fan spins really fast for increased cabin ventilation and the radio talk show host talks faster than the guy who sells mattresses.

Sherwood