Answer / jignesh parmar

IN MOTOR FLUX IS DIRECTLY PROPORTIONAL TO RATIO OF VOLTAGE
Vs frequency, i.e v/f it is derived from bellow formula
e= V = 4.44*flux*no. of turn*frequency
motor speed = 120*f/p
i.e speed can be ccontrolled by variying
frequency , but if only frequency increases then flux will
also increse,& flux increse beyond some level it cause
saturation also increse of flux increse loss, so to
maintain constant flux voltagge is also incresed in same
propotion to frequency as flux is directly proportion to
ratio of voltage/frequency i.e (v/f)
and that is called as variable voltage variable frequency
drive

Answer / nsnaidu

flux is directly proposnal to voltsge

Answer / kishore

flux is directly proposnal to the voltage.

What is the difference between MCCB & MOCB?

1 Answers  

---

What is the difference between ELCB and RCCB. Please define the working of both.

6 Answers  

---

how we check vector group dyn7

1 Answers  

---

what is meant by negative sequencing in power system.explain in detail

1 Answers  

---

what is dc voltage?

2 Answers  

---

---

what is the difference between the following 2 situations ? 1)Line & Neutral=240V Line & Earth=230V Neutral & Earth=10V 2)Line & Neutral=230V Line & Earth=240V Neutral & Earth=10V

2 Answers   Reliance,

---

In a simple spur gear train, gears with 24, 48, 32, 72 and 96 teeth are in sequence. The gear with 24 teeth runs at 900 rpm. The speed in rpm of gear with 72 teeth is

1 Answers   Caterpillar,

---

Difference between drift current and diffusion current?

0 Answers  

---

what is the transformer efficiency?

5 Answers  

---

For an induction motor wat is the loading/unloading cycle duration or interms of L/UL ratio/ percentage?

0 Answers   GEPL,

---

What is the formula to calculate the KVAR value of a capacitor, while value of capcitor in farads is known.

1 Answers  

---

What types of question are done for diploma students in aptitude test

0 Answers  

---