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How big is the collector current (Ic=?) of a transistor with 100 beta (hFE=100), if the serial base resistance is 1Kohm and 1V falls on it? a: 1mA b: 10mA c: 100mA d: 1A

So, I am trying to solve this question... I cant.. The question is from a test (elektrotanya.com). I have to answer the question in order to register. All 5 of them, I have answered 3 so far.

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SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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SOURCE: ASE test questions, answers

I think if you go to ASE on the web, they have practice questions, maybe???

Posted on Oct 22, 2009

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SOURCE: started engine, normal idle, but when you try to accerate the engine falls flat...either in or out of gear. replaced fuel filter and checked TPS. Continuity is per specs, but voltaqge is backwards..

First thing I'd do is check the fuel pressure w/ the engine running and then see if it holds the pressure w/ the engine off. If not, then the fuel pump is probably faulty.

Posted on Aug 04, 2012

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SOURCE: cam6 crank12 distributor wont fall on 6tab on4.3l

I'm assuming that your distributor won't properly engage with the oil pump drive? If this is the case, simply rotate the oil pump drive through the distributor hole with a long flat screwdriver. The distributor actually drives the oil pump, while the distributor is driven from the camshaft.

Posted on Jul 28, 2014

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BMW 2005 LT got a parasitic draw of 1.02 ma with everything off pulled all fuses but still showing up anywhere else I may look possibly a relay sticking any ideas ?


1.02 ma is extremely low and may be the current used by the ecm to maintain the CPU memory and to run the clock setting
a current draw that low will not discharge a fully operational battery
consider this --a good 500 cranking amp battery with a discharge of 1ma will last over a year or years before it shows signs of needing a recharge
however if the battery has an problem cell then internal discharge will flatten a battery in hours
have a load test done on the battery

Dec 14, 2016 | BMW Cars & Trucks

4 Answers

LED's hyper flashing


Make sure LEDs are fitted with correct polarity direction.
An L.E.D. is a special type of diode and is similar to a transistor. Diodes and transistors are "solid state" devices that are made from semiconductors such as silicon. The semiconductor is made to contain two types of special impurities. The first type of impurity, calL.E.D. "N" for negative, is a material with an excess of electrons. The other type of impurity, calL.E.D. "P" for positive, has a deficiency of electrons in "holes." These two kinds of impurities are dispersed into the semiconductor at different regions, so that a "P-N junction," or active layer, is created at the border.

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Jul 27, 2008 | 2007 Mercury Grand Marquis GS Sedan

1 Answer

Show me position for the instalation oil filter base gsket


The Internet has a large number of web sites
where you can buy service manuals and schematics
from bookstores, publishers, and other collectors.

Factory Auto manuals
http://www.factoryautomanuals.com/
search for : factory service auto repair manuals

Repair Service auto Manuals
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Chilton Repair and Service Manuals
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Haynes Repair and Service Manuals
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Jan 15, 2016 | 2007 Chevrolet Impala

2 Answers

If I want to bring 12 volt down to 3 volt via


You need to know in advance exactly how much current will be used and not just the maximum.
Resistance = voltage / current, so if you want to drop 9 volts at 1 amp, you'd use a 9 ohm resistor, but if it uses only 1mA, 9,000 ohms will be necessary. Most voltage converters use regulators which are much more complex than a single resistor.

Aug 29, 2014 | Cars & Trucks

2 Answers

Thompson TG782T boost wireless transmission around home


You have this posted in the wrong product category. Please re-post.

Jun 06, 2012 | Cars & Trucks

1 Answer

Left front wheel wobbling


Sounds like you need to replace your wheel seal, Don't wait on this , It can fall off while driving.
It's not a big deal and easyly replaced. A shop should 'nt charge over $100 top's.
Best of luck ,If you need anthing further just let me know.

Apr 07, 2011 | 2002 Chevrolet Suburban

1 Answer

I have a 1997 ford escort and it keeps blowing fuel injector fuses.can you point me in the right direction.


You probably have a shorted fuel injector coil or driver transistor. To find the problem, you need an ohmmeter (digital multimeter set to 200 Ohm scale). This test procedure is done with the car shut off.

Remove the connector from one of the fuel injectors. Measure the resistance between the two terminals and write it down. Next, hold the black (common) test lead of the ohmmeter to a nice, clean ground spot (anywhere on the engine is OK) and push the red (+) lead of the ohmmeter into one of the sockets on the injector connector. Repeat with the other socket. Both should read very large or open values. If you get a reading under 1 Ohm on the connector, you have a shorted driver transistor and the ECM will have to be repaired or replaced.

Plug the injector connector back in, and repeat the test with the next injector. If you find an injector with a coil resistance much less than the others, that injector has a short in the coil and it must be replaced. The readings should be within 5% of each other.

If your car has throttle body injection (only one injector), the coil resistance should probably be about 10 to 20 Ohms. I suggest calling the service department at the local Ford dealer and asking what the fuel injector coil resistance is supposed to be.

Do not be surprised if you find the driver transistor is shorted and the coil is also shorted or burned out; if one part goes bad there is a good chance it will ruin the other (a shorted transistor will keep the injector on all the time and overheat the coil; a short in the coil will allow too much current in the transistor and overheat it. If you are having a "not-so-bad" day, the fuses blew quickly enough to prevent the double failure.

Mar 22, 2011 | Ford Escort Cars & Trucks

1 Answer

Car keeps blowing the efi fuse 15 and fuel pump wont run


I surmise you have a shorted fuel injector or injector driver transistor. The engine computer probably knows something is wrong and is not turning on the fuel pump relay as a safety measure. You will need a digital multimeter or a VOM to track down the problem.

Remove the EFI fuse, turn the ignition to ON, but don't start the engine. Measure the voltage between ground and each terminal of the EFI fuseholder. You will make the following tests at the terminal that does NOT have 12 Volts on it (fuse output). Turn off the ignition and disconnect the battery.

Measure the resistance from the fuse output terminal. It will probably be much less than 1 Ohm. The next thing is to check the fuel injectors. Disconnect the injectors one at a time and check the resistance . If the resistance suddenly increases substantially more on one injector than it does when the others are unplugged, you've found the culprit. Now you need to check the injector driver transistor. One of the wires to the injector is 12 V from the fuse output and the other goes to the transistor. Check the resistance to ground. If it is 0 or close to it, the transistor is fried, and the EFI module (or engine computer if it is contained there) will need to be repaired or replaced. Also, compare the resistance of the suspect injector with the others. If it is substantially less, the injector coil is bad (a failure in one part can ruin the other, so check both).

Nov 18, 2010 | 1991 Toyota Celica

2 Answers

Will i damage the stereo in my 2001 toyota sienna if i replace the stock 8 ohm speakers with 4 ohm speakers? the rear speakers are blown. if i can should i do all four? i happen to have four 4 ohm speakers


You can use the 4 ohm speakers if you don't get carried away and crank the volume all the way up. If you really crank it up there is the chance of doing damage to the stereo amplifier. 8 ohm speakers would of course be better, but if it was me I'd probably try it. No guarentees though!

Oct 23, 2009 | 2001 Toyota Sienna

1 Answer

Charokee charging problem


I'm not sure whether the high or low side of the field is controlled; typically, it is the low side with 12V applied to the field and the low side controlled by a a transistor in the ECU. If you are measuring 12V at a field terminal, it may be normal and when I have monitored this voltage on the controlled side, it was always lower than 12. I can't give you a range because ot the variation of load on the output.
If you measure the resistance of the field winding, you can get a rough idea of the current it draws. For example; measuring 100ω would yield a max current of ~120mA. ( I=E/R)
I have something in mind about 200ω but that seems too high but it should be in the range of ~100 - 200ω. 

Sep 08, 2008 | 1993 Jeep Cherokee Country

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