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4hv.org :: Forums :: General Science and Electronics
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Electrical Quizzes - QUIZ 8 POSTED

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Marko
Wed Feb 22 2006, 03:38PM
Marko Registered Member #89 Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145
 		Congratulations, solution is right.
I had to decode the schematic a bit, but it seems good.
I solved same problem a bit different;

1140448666 T

But result is the same. smile
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HV Enthusiast
Wed Feb 22 2006, 07:48PM
HV Enthusiast Registered Member #15 Joined: Thu Feb 02 2006, 01:11PM
Location:
Posts: 3068
 		QUIZ 6

1. What is the quiescent current when the circuit is off?

2. After 60 minutes of being in an engineering lab, what is the state of the circuit?
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Tetrafluoroethane
Wed Feb 22 2006, 08:51PM
Tetrafluoroethane Registered Member #127 Joined: Fri Feb 10 2006, 03:36PM
Location: Cincinnati, OH - USA
Posts: 44
 		Answer 1) 3ma?

Answer 2) Disconnected from power because someone hit the button after 5 minutes and nobody could find any other way to shut it off.
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Electroholic
Wed Feb 22 2006, 08:55PM
Electroholic Registered Member #191 Joined: Fri Feb 17 2006, 02:01AM
Location: Esbjerg Denmark
Posts: 720
 		do we assume the transistors to be perfect?
no leakage?
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IamSmooth
Wed Feb 22 2006, 10:50PM
IamSmooth Registered Member #190 Joined: Fri Feb 17 2006, 12:00AM
Location:
Posts: 1567
 		Is the quiescent current zero?
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Hazmatt_(The Underdog)
Thu Feb 23 2006, 12:22AM
Hazmatt_(The Underdog) Registered Member #135 Joined: Sat Feb 11 2006, 12:06AM
Location: Anywhere is fine
Posts: 1735
 		You guys are using up way too much thinking power to come to the answer!

I agree with the relay, Flip Flop or transistor inverter circuit.

>>>>HEH...woops..I was still reading page 1<<<<<<<<
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WaveRider
Thu Feb 23 2006, 08:36AM
WaveRider Registered Member #29 Joined: Fri Feb 03 2006, 09:00AM
Location: Hasselt, Belgium
Posts: 500
 		Quiescent state current: very nearly zero (just leakage current thru transistors).

State after an hour in the lab: Disconnected from power (as TetraFluoroEthane said) because no one can turn it off! (The transistor configuration is like that of an SCR.)

Cheers!
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Steve Conner
Thu Feb 23 2006, 12:37PM
Steve Conner Registered Member #30 Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
 		I guess EV's last quiz is solved, so here is one.

The circuit below is a voltage doubling rectifier, loaded by some sort of load (you don't need to know what) that draws a steady 5 amps DC with negligible ripple. The moving coil meter I2 will obviously read 5 amps. But what does the other meter (I3) read?
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HV Enthusiast
Thu Feb 23 2006, 01:00PM
HV Enthusiast Registered Member #15 Joined: Thu Feb 02 2006, 01:11PM
Location:
Posts: 3068
wrote ...

I guess EV's last quiz is solved, so here is one.

Yes, congratulations goes to Waverider - Nice job!!!

wrote ...

The circuit below is a voltage doubling rectifier, loaded by some sort of load (you don't need to know what) that draws a steady 5 amps DC with negligible ripple. The moving coil meter I2 will obviously read 5 amps. But what does the other meter (I3) read?

The current through I3 will be postive spikes of high current at a frequency of 50Hz, but since I3 is a coil vane meter, it won't be able to react fast enough to detect these, so instead it will read the Rms current of this which is approximately 15A.

Dan
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Dr. Dark Current
Thu Feb 23 2006, 05:08PM
Dr. Dark Current Registered Member #152 Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
 		I3 will read also 5 amps.
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