Interview Question in electrical circuits |
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1. For automotive work, common wrench sizes range from:
_____ a. 1/8 inch to 5/8 inch (standard) and 6 mm to 60 mm (metric).
_____ b. 1/4 inch to 3/8 inch (standard) and 3 mm to 36 mm (metric).
_____ c. 1/4 inch to 1-7/8 inch (standard) and 6 mm to 40 mm (metric).
_____ d. 1/4 inch to 1-5/8 inch (standard) and 6 mm to 32 mm (metric).
2. If a bolt or nut is stripped, a/an __________ wrench should be used to remove the stripped part?
_____ a. pipe
_____ b. impact
_____ c. adjustable
_____ d. combination
3. When installing an oil filter, you should:
_____ a. use an oil filter wrench.
_____ b. tighten it by hand.
_____ c. tighten it at least 1 ½ turns.
_____ d. turn it counterclockwise one full turn.
4. After cleaning battery terminals, some technicians use a little chassis grease to:
_____ a. insulate the terminals from accidental shorts.
_____ b. seal the terminals and retard corrosion.
_____ c. improve the electrical connection between the terminals and cables.
_____ d. make the terminals easier to remove the next time.
5. The specific gravity, as measured with a hydrometer, of a fully charged cell in a lead-acid automobile battery is:
_____ a. 13.1 to 16.0.
_____ b. 12.6.
_____ c. 7.0.
_____ d. 1.27.
6. If the charging voltage of an automobile electrical system is over 16 volts, the __________ is/are likely to be defective.
_____ a. battery
_____ b. starter
_____ c. voltage regulator
_____ d. battery cables
7. How should an ammeter be connected when checking the load, or current drain, from a battery?
_____ a. Red meter lead to positive battery terminal; black meter lead to disconnected end of positive battery cable
_____ b. Red meter lead to negative battery terminal; black meter lead to positive battery terminal
_____ c. Red meter lead to positive battery terminal; black meter lead to negative battery terminal
_____ d. Black meter lead to negative battery terminal; red meter lead to chassis ground
8. If there is any doubt about what should be added to a cooling system using a new extended-life coolant after testing the specific gravity:
_____ a. flush and refill the system.
_____ b. consult the vehicle owner's manual.
_____ c. add water.
_____ d. add coolant.
9. A vacuum gauge is used to:
_____ a. detect leaks in the cooling system.
_____ b. detect intake and mechanical problems in the valve and piston area of the engine.
_____ c. adjust the flow pattern of fuel injectors.
_____ d. check ring and pinion gear backlash.
10. A good fuel injector should produce a/an:
_____ a. oval spray pattern and remain open after firing.
_____ b. irregular spray pattern and partially close after firing.
_____ c. circular spray pattern and remain open after firing.
_____ d. cone-shaped spray pattern and shut off after firing.
11. When setting the ring and pinion gear backlash of a differential, for greater accuracy, you should:
_____ a. set the clearance between .008" and .010".
_____ b. use a hydraulic press.
_____ c. look up the setting for the specific differential being serviced.
_____ d. use a smaller clearance setting on differentials that run hot.
12. The toe angle is usually set "in at the front," which means that the front tires are:
_____ a. pointing toward each other when viewed from the front.
_____ b. pointing toward each other at the top, inward toward the center of the vehicle.
_____ c. pointing away from each other at the top, outward from the center of the vehicle.
_____ d. perfectly parallel to the vehicle.
13. When removing a shock absorber, a special tool is used to:
_____ a. remove the two bolts at the top.
_____ b. hold the end of the shock while the nut is removed.
_____ c. hold the end of the shock while the upper bolt is removed.
_____ d. remove the nut and two bolts holding the shock in place.
14. A/An __________ is used to correct static and dynamic tire imbalance.
_____ a. drum gauge
_____ b. alignment machine
_____ c. tire balancer
_____ d. tire changer
15. In addition to special brake tools, what regular hand tool is needed to assemble shoe type brakes?
_____ a. A pair of pliers
_____ b. A Phillips-head screwdriver
_____ c. A ball peen hammer
_____ d. A soft face hammer
16. A brake shoe-to-drum gauge is used to:
_____ a. adjust the drum to the circumference of the brake shoes.
_____ b. adjust brake shoes to the diameter of the drum.
_____ c. determine the placement of the brake drum.
_____ d. measure the thickness of the brake drum.
17. A continuity tester is used to check electrical circuits for:
_____ a. improper voltage.
_____ b. insufficient current.
_____ c. excessive current.
_____ d. a broken connection.
18. An ohmmeter is used to check the:
_____ a. voltage in an electrical circuit.
_____ b. amount of resistance in a wire or circuit.
_____ c. amount of current flow in a circuit.
_____ d. amount of power consumed by an electrical device.
19. Most headlights are set:
_____ a. horizontally straight ahead, because the low beams automatically drop lower and to the right.
_____ b. first for the high beams and then for the low beams.
_____ c. low and to the right.
_____ d. low and to the left.
20. The lower (smaller) the gauge number of an electrical wire, the:
_____ a. thinner the wire's insulation.
_____ b. lower the current-carrying capacity of the wire.
_____ c. higher the current-carrying capacity of the wire.
_____ d. smaller the diameter of the conductor.
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voltage is a potential difference between two points, usually in a circuit. you can think of it as analogous to gravity potential...though don't carry that analogy too far or else you get yourself into trouble with energy. electrons/other charged particles will tend to flow from high potential places to low.
current is the amount of charge passing through a surface in a given time; it is usually denoted by dQ/dt.
power, when defined mechanically, is a measure of energy per unit time. your light bulbs are measured in units of power (watts). with electrical circuits, power = IV, which is current times voltage (for relatively simple circuits).
energy is probably the most abstract concept of these. it is...a measure of the ability to do work, to put it sort of vaguely. energy equations in circuits vary depending on your components.
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I am an electrical and comp. engr. major. right now i'm taking electrical circuits and i know how to do all these problems dealing with kirschoff's voltage law and voltage divider...but i don't what "voltage" actually is. The book explained it kinda weird and it was a really complicated explanation.
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There isn't really an inverse.
There are three dynamic properties in electrical circuits - resistance, capacitance, and inductance... they behave mathematically the same as a mass, a spring, and a shock absorber do.
[edit] I just remembered my limited knowledge regarding power factors:
To cancel the effects of large inductive loads on power transmission systems, you can add capacitance... The capacitance keeps the lights from dimming when big motors are started up.
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I haven't made any oscillator circuits before, but for my essay I need to do a lab and basically create a transformer, but more like a wireless energy transfer apparatus.
I was advised that a DC power source would only short-circuit. So I have an AC power source with variable voltage, but I need the oscillator to oscillate at a specific, known frequency. Would the AC source somehow change the oscillating frequency? Sorry if my question is frustrating, because I am a high school student who learned everything about electrical circuits on wikipedia and through other personal research.
So, to simplify my question: if I connect a capacitor, inductor, and an AC power source in series with no resistors, would it generate the desired frequency (from LC) without shorting the circuit? If I need to add resistors, which model/configuration is the simplest and most reliable? What type of power source do I need?
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when I set the DC voltage source of any circuit to a particular level, and then add some loads to the circuit and then re-measure the total voltage of the circuit, it becomes lower than the source's voltage..............is there any reason for that (other than the wires' resistance) ??????
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I want to know how i can use my pc to obtain wave forms of AC and DC voltages and also analyse electrical circuits.
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Much has been said about the mathematical analogies between certain mechanical and electrical systems. See the following for example:
http://www.swarthmore.edu/NatSci/echeeve...
"LCR" circuits lead to differential equations that result in oscillatory behavior---the three essential components in electric circuilts being the inductor (L), capacitor (C), and resistor (R). They have their mechanica analogues.
Water flow dynamics share some analogies as well with such mechanical and electrical circuits, such as resistance through a pipe or constriction. Given a high tank of water and a lower place for water to drain to, can a "water circuit" be devised, involving no moving mechanical parts, that can result in oscillatory behavior, per the same kind of differential equations? Would it be possible to make a school science project to induce water, in flowing from a high to a low place, to oscillate?
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I am in my third year of college and I am going to school for an EE degree. I am always repairing and designing of all types of electrical circuits. I am also a live sound engineer and network administrator. For the past ten years or so I have been using my fathers old analog multimeter but I think that it is time that i invest in a new one. I have done some searching and I like the ones that can connect to the computer to log information. I want something that I can use for the rest of my life. Features are nice but low price is also a nice thing because I am a starving college student. Since this is something I plan to use for the rest of my life, I dont mind spending a little extra though.
Does anyone have any suggestions on specific products?
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I am in my third year of college and I am going to school for an EE degree. I am always repairing and designing of all types of electrical circuits. I am also a live sound engineer and network administrator. For the past ten years or so I have been using my fathers old analog multimeter but I think that it is time that i invest in a new one. I have done some searching and I like the ones that can connect to the computer to log information. I want something that I can use for the rest of my life. Features are nice but low price is also a nice thing because I am a starving college student. Since this is something I plan to use for the rest of my life, I dont mind spending a little extra though.
Does anyone have any suggestions on SPECIFIC products?
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I am wondering how electrical circuits and systems are actually designed in the real world. Is there a formal process that goes into designing a circuit for a particular purpose? I have heard of electronic design automation for digital circuits, but how is this actually done? What about for analog circuits? Power systems? Thanks!
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