Engineering - December 2006

These are the qustions may be asked in my lab on coming tuesday. Please answer and help me.
THIS IS ELECTRICAL MACHINES LAB.
load test on compound dc genetator.
1. said that at the starting of experiment armature resistance should be kept at max. and field resistance at min. positions. why?

2.why speed must be maintained const. through out the experiment.?

3. why 4 point starter arm must be kept at the extreme left position before switching on the supply?

4. what is tachometer? why it should be kept in line with the shaft while measuring the speed of the motor?

HOPE SOME MAY EXPLAIN ME THE ABOVE REASONS, UR S BROTHER MADHU.

2006-12-12 18:13:19 · 2 answers · asked by madhu1187 1

Can anyone answer this question for me?
Thanks in advance!

2006-12-12 15:30:23 · 6 answers · asked by cyvoonie87 1

does gold conduct electricity or not?

2006-12-12 15:14:00 · 2 answers · asked by ☆★♪♫Caitlin♫♪★☆ 2

used on the reciveing end what is the part called that recieves the signal it looks just like the ir led.

2006-12-12 14:56:16 · 2 answers · asked by Aaron A 5

i thought i read once where somebody was trying to invent machinery thats noise was out of phase or something which would cancel out other noise....does this make sense, can you explain to me please.....i did read about this about 10 years ago in a trade magazine...

2006-12-12 14:51:08 · 4 answers · asked by jstrmbill 3

Can some body explain more details on Pulse Width Module (PWM) ?

2006-12-12 13:34:23 · 4 answers · asked by cyvoonie87 1

what is the difference between compression ratio and the efective compression ratio in analyzing thermodynamic engine cycles???

2006-12-12 13:28:37 · 6 answers · asked by Anonymous

When a microwave starts sparking, how long do you have before it explodes\catches fire, and which of these is most likely?

2006-12-12 13:15:55 · 8 answers · asked by Anonymous

What factors influence the withstand voltage of a capacitor?

2006-12-12 12:49:40 · 4 answers · asked by Jackson K 1

I'm a beginner electronics hobbyist. I dont have trouble with any other part except the potentiometer. How do I place it on a breadboard or on a printed circuit board?

2006-12-12 12:23:02 · 4 answers · asked by Mary 1

2006-12-12 12:02:54 · 4 answers · asked by Emily C 1

2006-12-12 11:56:26 · 3 answers · asked by Anonymous

a=xi-11j+13k
b=-11i+xj-7k
c=13i-7j+xk
Find the largest value of x for which the magnitude of the resultant of the three vectors is equal to 19.

2006-12-12 10:48:58 · 2 answers · asked by ozi 1

I need some help. I need to know 10 ways a spefic magnet is use doesn't matter what type just need to know what it does

What does the magnet do?

what "machine" it's found in?

what does the "machine" do?

what industy is it used in?

2006-12-12 10:37:00 · 2 answers · asked by Ambegurl 3

(i) What is the x component of the resultant force vector?
(ii) What is the y component of the resultant force vector?
(iii) What is the z component of the resultant force vector?

2006-12-12 10:21:32 · 3 answers · asked by oss o 1

2006-12-12 09:57:45 · 4 answers · asked by bhbghgjbvmnbncvb 4

2006-12-12 09:38:05 · 1 answers · asked by Surviving on love 3

where can I find discs roughly 2 to 4 inches (5 to 10 centimeters) of boron carbide, possibly with a 1/4 to 1/2 inch hole in it. Preferably least 100 count for under 50 dollars

I am also interested in Kevlar on the cheap

2006-12-12 09:33:02 · 1 answers · asked by armorsmith42 2

2006-12-12 09:31:52 · 2 answers · asked by bltzburgher05 1

I have an idea for an invention, but have no idea how to go about building this device, with all its intracacies, into a working prototype. Beyond that, I also need help designing it for market. What agencies out there can help me and how much do they cost? Being in the Oklahoma area is preferable.

2006-12-12 09:14:08 · 4 answers · asked by krusher84 2

2006-12-12 08:51:00 · 2 answers · asked by Timothy J 1

2006-12-12 08:48:50 · 1 answers · asked by Anonymous

I'm a design student and trying to make a materials specification for a component. It's only for domestic use, so I need the mechanical properties such as Youngs Modulus to be high enough to prevent a human from breaking it - how high does this need to be?

2006-12-12 08:24:16 · 4 answers · asked by Fez 1

2006-12-12 07:50:00 · 3 answers · asked by zaebo 1

I have a temperature control circuit that runs at 12 V, but I need to control a 120V circuit (1/2 amp is enough)

2006-12-12 07:45:53 · 4 answers · asked by Anonymous

I am particapting in a science decatholon( 10 events) with school. One of the events that i am particapting in is robotics. I have never done robotics before and am totaly confused. Can anyone give me suggestions or help with this?

2006-12-12 07:24:46 · 3 answers · asked by Anonymous

2006-12-12 07:22:25 · 9 answers · asked by ladytiggon 1

I realize there's no specific formula for this, but any rough idea how the rpm would vary if say I had a 12V dc motor currently at 1,000 RPM unloaded. If I was to then add 200g on an 8cm long rod centred perpendicular to the motor, what effect would this have on the RPM?

Oh, and are the torque-rpm gradient values for the motor irrelevant in this case because the load is vertical (i.e. parallel to the axis of rotation and not perpendicular to the 'radius')?

Any advice much appreciated!

2006-12-12 07:02:57 · 2 answers · asked by dfx 1

2006-12-12 06:58:58 · 3 answers · asked by ali_alaqees 1

circuit diagrame and software.

2006-12-12 06:52:47 · 5 answers · asked by Alizeee 1