Multiple Choice Questions in Electronics Engineering Part 1

ELECTRICITY AND MAGNETISM FUNDAMENTALS

1.      Who discovered the relationship between magnetism and electricity that serves as the foundation for the theory of electromagnetism?

A.    Luigi Galvani

B.     Hans Christian Oersted

C.     Andre Ampere

D.    Charles Coulomb

2.      Who demonstrated the theory of electromagnetic induction in 1831?

A.    Michael Faraday

B.     Andre Ampere

C.     James Clerk Maxwell

D.    Charles Coulomb

3.      Who developed the electromagnetic theory of light in 1862?

A.    Heinrich Rudolf Hertz

B.     Wilhelm Rontgen

C.    James Clerk Maxwell

D.    Andre Ampere

4.      Who discovered that a current-carrying conductor would move when placed in a magnetic field?

A.    Michael Faraday

B.     Andre Ampere

C.     Hans Christian Oersted

D.    Gustav Robert Kirchhoff

5.      Who discovered the most important electrical effects which is the magnetic effect?

A.    Hans Christian Oersted

B.     Sir Charles Wheatstone

C.     Georg Ohm

D.    James Clerk Maxwell

6.      Who demonstrated that there are magnetic effects around every current-carrying conductor and that current-carrying conductors can attract and repel each other just like magnets?

A.    Luigi Galvani

B.     Hans Christian Oersted

C.     Charles Coulomb

D.    Andre Ampere

7.      Who discovered superconductivity in 1911?

A.    Kamerlingh Onnes

B.     Alex Muller

C.     Geory Bednorz

D.    Charles Coulomb

8.      The magnitude of the induced emf in a coil is directly proportional to the rate of change of flux linkages. This is known as

A.    Joule’s Law

B.     Faraday’s second law of electromagnetic induction

C.     Faraday’s first law of electromagnetic induction

D.    Coulomb’s Law

9.      Whenever a flux inking a coil or current changes, an emf is induced in it. This is known as

A.    Joule’s Law

B.     Coulomb’s Law

C.    Faraday’s first law of electromagnetic induction

D.    Faraday’s second law of electromagnetic induction

10.  The force of attraction or repulsion between two magnetic poles is directly proportional to their strengths.

A.    Newton’s first law

B.     Faraday’s first law of electromagnetic induction

C.    Coulomb’s first law

D.    Coulomb’s second law

11.  The force of attraction or repulsion between two magnetic poles is inversely proportional to the square of the distance between them. This is known as

A.    Newton’s first law

B.     Faraday’s first law of electromagnetic induction

C.     Coulomb’s first law

D.    Coulomb’s second law

12.  Whenever a conductor cuts magnetic flux, an emf is induced in it. This is known as

A.    Coulomb’s law

B.     Joule’s law

C.    Faraday’s law

D.    Ohm’s law

13.  A law that states that the polarity of the induced voltage will oppose the change in magnetic flux causing the induction.

A.    Joule’s law

B.     Faraday’s law

C.     Coulomb’s law

D.    Lenz’ law

14.  A law that states that the current in a thermionic diode varies directly with the three-halves power of anode voltage and inversely with the square of the distance between the electrodes, provided operating conditions are such that the current is limited only by the space charge.

A.    Hall’s law

B.     Joule’s law

C.    Child’s law

D.    Coulomb’s law

15.  States that the ratio of the thermal conductivity is proportional to the absolute temperature for all metals.

A.    Wien’s displacement law

B.     Hartleys law

C.     Hall’s law

D.    Wiedemann Franz law

16.  A law establishing the fact that the algebraic su of the rises and drops of the mmf around a closed loop of a magnetic circuit is equal to zero.

A.    Kirchhoff’s circuital law

B.     Maxwell’s circuital law

C.    Ampere’s circuital law

D.    Coulomb’s circuital law

17.  The net electrical charge in an isolated system remains constant. This is known as

A.    Law of conservation of charge

B.     Coulomb’s first law

C.     Coulomb’s second law

D.    Law of conservation of energy

18.  Lenz’s law is the consequence of the law of conservation of

A.    Energy

B.     Charge

C.     Field lines

D.    Momentum

19.  Lenz’ law states that the direction of the induced emf and hence current

A.    Is determined by the rate of current flux

B.     Is found by the right hand rule

C.     Is found by the left hand rule

D.    Always opposes the cause producing it

20.  If you hold the conductor with right hand so that the stretched thumb points in the direction of the current, then encircling fingers will give the direction of magnetic lines of force round the conductor. This is known as

A.    Left hand cork screw rule

B.     Right hand cork screw rule

C.     Left hand rule

D.    Right hand rule

21.  If the right handed bottle-opener cork screw is assumed to be along the conductor so as to advance in the direction of current flow, the motion of its handle will indicate the direction of magnetic flux produced around the conductor. This is known as

A.    Right hand rule

B.     Left hand rule

C.     Cork screw rule

D.    End rule

22.  If on looking at any one end of a solenoid; the direction of current flow is found to be clockwise then the end under observation is a south pole. This is known as

A.    Right hand rule

B.     Left hand rule

C.     Cork screw rule

D.    End Rule

23.   If the solenoid is gripped by the right hand with the fingers pointing the direction of current flow, the outstretched thumb will then point the north pole. This is known as

A. Right hand rule

B. Helix rule

C. End rule

D. Cork screw rule

24.  The  process by which an emf and hence current is generated or induced  in a conductor when there is a change in the magnetic flux linking the conductor is called

A. Electromagnetic induction

B. Mutual induction

C. Faraday’s law

D. Electromagnetic interference

25.  The emf induced in a coil due to the change of its own flux linked with it is called

A. Mutually induced emf

B. Dynamically induced emf

C. Statically induced emf

D. Self induced emf

26.  The emf induced in a coil due to the changing current of another neighboring coil is called

A. Mutually induced emf

B.  Self induced emf

C.  Statically induced emf

D. Dynamically induced emf

27.  When a conductor is stationary and the magnetic field is moving or changing the emf induced is called

A. Statically induced emf

B. Mutually induced emf

C. Self induced emf

D. Dynamically induced emf

28.  The magnetic potential in a magnetic circuit can be measured in terms of

A. Mmf

B.  Emf

C.  Farad

D. Coulomb

29.  A substance that attracts pieces iron

A. Conductor

B.  Semiconductor

C.  Magnet

D. All of the above

30.  The phenomenon by which a subtracts pieces of iron

A. Magnetism

B. Electromagnetism

C. Naturalism

D. Materialism

i want to take the board exam on april 2012, ok lang bang di na ko mag enroll sa review center?

I suggest you enroll in a review center. There's so much to study and you'll definitely need their help.

Ask me anything, I will answer it.

Eat, Swim, Make Little Sharks (Before The Blog - 1)

Shortly before I started the blog my hard drive died an ugly and unceremonious death, and of course being the tech savvy person I am I hadn't backed anything up. Smart right? Thankfully for this post some lower resolution stuff had ambled its way onto my flickr page, and it's sat there ever since. I'd never thought to post it on the blog since it's not really what the blog is about (but in a way it's what sparked of the notion that led to it, as you can read about all the way back at the beginning - You'll see one of this posts images there too). But since this month is going to be fairly slow it's time to start dredging the archives. Skip to the end? OK, to pictures!

So this got the ball rolling - I thought it would be cool do do a Jaws poster in the style of Saul Bass. You know who Saul Bass is right?

I thought it turned out pretty well, and of course it didn't require much in the way of drawing. A few days later I thought I'd try doing a Jaws poster in the style of something else (you may wonder why Jaws. It's a brilliant and iconic poster, and highly adaptable. That's really the only reason).

This was the weakest of the Jaws posters I did (IMO), and didn't really need any actual drawing at all. In retrospect it's rubbish, but it does sort of capture that Soviet propaganda feel. I think I could do this one better now.

If you're interested the text says "They hunt the shark, but it eats them! Cheer the shark that eats Yankees! JAWS" but it's translated through Bablefish or something so it probably actually says "Waterbear is needed, eat fresh thyme! Applaud Americans eating Waterbear! SMILE!" But I digress.

Probably the one that most accurately nails the desired style (Looney Tunes title cards), but also the one I had the most trouble with since I couldn't draw for toffee (nothing much has changed you'll note). All the text was hand lettered (not that you can tell). I quite like it though. Not much else to say really

Jaws in the (vague) style of the now defunct Designers Republic. The Jaws poster as an infographic basically. I really should rework this one at a higher res again and get it printed because I think it's brilliant even now (I may be alone in this). This is probably the most widely seen piece I've ever done outside the game industry by the way; my brother stuck it into an episode of Sinister Dexter that appeared in 2000AD ("The galaxy's greatest comic!" He's a colourist). No I didn't get paid, it's a brilliant brotherly in-joke!

So there you have it - a little slice of Mestory. I might do another of these little retrospectives soon, but next up... Well, I have no idea right now, I'll have to think of something.

Oh, and "Eat, swim, make little sharks" is a quote from the film - Hooper describing pretty much everything that sharks do.

The Great Depression

I have produced next to nothing this month. This is due to a combination of factors, among them is the aspect of pure laziness, the videogame Skyrim, and 'trouble at mill,' as Graham Chapman once said.

If you've been paying attention you'll know which company I work for, and if you frequent the right news sites you'll have seen that company in the news a bit with wild rumors and speculation flying around. It's all been very stressful. Don't ask me if the rumors are true, if I knew I still couldn't tell you and I'd be a lot less stressed...

Anyway, this just means I don't have much to show right now, but I did managed to pick up a paintbrush for the first time since I left school. I have to tell you the results were... well, see for yourself.

My wife has banned me from using words such as "dreadful," "Crap," and "sad" to describe this piece, so let's just focus on the positives and the process. If you feel any of those words are appropriate though I won't hold it against you in any way.

I've had the paints since August, but I've only now managed to get up the interest and courage to use them. Also my wife told me to paint and keep my son occupied by having him paint too while she had a nap. This didn't go quite as well as planned as he'd finished his painting in 6 minutes and spent the next hour until my wife woke up asking if I was done yet so we could play Lego. So that's a positive, it was painted under duress ;)

Here's how it started:

Please excuse the quality of the shot, it was a light sketch on canvas and taken with a phone camera - I had to run it through Photoshop before you could even see the sketch. This is actually the most depressing noteworthy thing about the whole process. I hadn't seen the sketch since I did it until today when I worked to make it actually visible. It's pretty good! She looks kinda cute rather than the mannish features in the final painting. I think it all went a bit wrong somewhere don't you? Anyway, this was based on Stock Art from lockstock on Deviant art. The sketch doesn't look that much like her but it's a lot better than the end result close enough.

I'm just going to post some pictures now - the only thing of note is that you finally get to see a photo of the fat welshman writing this as my wife took some snaps while I was distracted. They come near the end of the painting due to her having slept through the start of it.

So there you have it, my first actual painting in 20 odd years, and it's god awful better than I had any right to expect. In all seriousness I did manage to mix a fairly good flash tone right off the bat, it's just a shame there's very little variation in it. I learnt quite a bit from doing it though, and any lack of spirits from the lack of quality is not the reason I haven't picked up a brush again since. I'm quite looking forward to having another go, but it takes longer to set up and prep and actually do it, and finding the time and the inclination has been difficult the last few weeks (you'll not from the photos that I'm working on the kitchen table - I don't really have a space to do this with good light where I'm not disturbed).

Coming up - January's sketches, some stuff from before I started the blog and a piece I've been putting off finishing because I don't like it, then I see it and think "That's not so bad, I should get back to that." Stay Tuned... Or bookmarked, whatever takes your fancy really.