speed control by the variation of field flux result in 1- constant power drive 2-variable torque drive

1 Answers  

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what is the work of commutator and brush in motor

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Question 98 - The Planck-Einstein relation connects the particulate photon energy E with its associated wave frequency f to produce E = hf. Let h to be the Planck constant. The frequency f, wavelength L and speed of light c are related by E = hc / L. With p denoting the linear momentum of a particle, the de Broglie wavelength L of the particle is given by L = h / p. (a) Find the equation of E as a function of p and c. (b) If E has a unit of electron-volt and f has a unit of 1 / second, then what is the unit of h?

1 Answers  

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why we use transformers?

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can DOL used with slip ring motor?

0 Answers   NTPC,

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a high voltage electric line for showing a blinking rod but connected a single line..wht is the rods name...and explain its working

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Question 97 - Two viruses a and b with masses of Ma and Mb are moving at velocities of Va and Vb respectively, facing towards each other and collide. After collision both masses of Ma and Mb disappear. (a) Find the total momentum available for both a and b. Hint : momentum = mass x velocity = M x V. (b) Guess the total energy E generated from the disappearance of a and b. Let c to be the velocity of light. Hint : E is equal to M c square.

1 Answers  

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What is the neutral voltage in practical AC systems

0 Answers   VCMS Technologies,

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i want to design tap changer for 15kv to 0.4kv steepdown transformer then how can i calculate tap number required

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If I installed wrong directions orifice plate then what showing value d.p transmitter in D. C. S. ?.....

0 Answers   TCL,

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main() { char input[] = "SSSWILTECH111"; int i, c; for ( i=2; (c=input[i])!=''; i++) { switch(c) { case 'a': putchar ('i'); continue; case '1': break; case 1: while (( c = input[++i]) != '1' && c!= ''); case 'E': case 'L': continue; default: putchar(c);continue; } putchar(' '); } putchar(' '); }

1 Answers   Vector,

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what electricalcable size for 132kw motor 4pole

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