Answer / ghulamsarwar3

DOL(direct online) that means full voltage starter.we are
using star delta starter to control starting torque and
current as we know motor will satart in star then after few
second it will go in delta.and now a days there is no
manual star delta starter only automatic,but functiion is
same,

Answer / bosky babu

DOL means Direct On Line Starter, can be used up to 7.5 HP Motor, and for above 7.5 HP to 150 HP a star delta starter is used.In automatic star delta starter, a timer is used to switch on the delta contactor. For higher HP ratings VFD (variable frequency drives) can be used.

All tape of electrical questions Answers tape of motor transformer e.o.t crane

0 Answers   Afcons, Honeywell, Manlift, SIMS,

---

What is mean by Power factor

5 Answers   Fenner,

---

explain the f=np/120 this equ.how to come 120

3 Answers   Jayaswal Neco Industries,

---

How are harmonics produced in AC machines?

4 Answers  

---

What is the function of electron gun used in crt?

0 Answers  

---

---

What is cogging and crawling phenomenon in motor.

2 Answers   DAE,

---

Why we connect the capacitor in Delta?if we conect in Star what will happen?

9 Answers  

---

How is the resonant peak, resonant frequency, and bandwidth determined from nichols chart?

0 Answers  

---

I am using submission of two ct in one and half scheme for 67/67N protection. Both CTs star point is grounded separately near ct box.Will two point ground give wrong tripping to 67/67N during fault or no matter.

0 Answers   NCC,

---

what is the application of dynamic Breaking resistor in inverter ? & How it works ?

2 Answers  

---

could any one explain me what power factor and where it is use ful

3 Answers  

---

How to size the Neutral grounding resistor?

1 Answers  

---