Answer Posted / sana

as Vo=Vcc-IcRc
Vcc= constant so we can say that Vo iz directly proportional to IcRc. now when Vb(base voltage) increase Ib increase so Ic increase and voltage drop across Rc increase so Vo decrease....... producing 180 phase shift

What difference between ref protection and differential protection ?

1864

---

A 500 V shunt motor runs at its normal speed of 250rpm when the armature current is 200A. The resistance of the armature is 0.12 Ω. Calculate the speed when a resistance is inserted in the field reducing the shunt field to 80% of normal value and the armature current is 100A.

2521

---

what is the acceptable value of TAN DELTA and dissipation factor for 11kV, 1.75HP Motor?.

4186

---

How we can calculate the consumption in kwh of motor on basis of kw @100% load, @50% load & @ no load.

2801

---

how 650 volts creates? where is use?

2222

---

What will be the impact on motor performance if a LT motor is rewound with changed motor winding data as given below:- Original winding data: total 04 wires = 02 wires of 17 SWG + 02 wires of 16.5 SWG. Changed Winding data: total 03 wires of 15.5 SWG wire size Motor rating: 160KW, 740RPM, 415V, ID FAN application. Normal Running Current = 95% of FL Current.

2056

---

What is the lifetime of a Thyristor? Is there a recommended lifetime for thyristors after which they should be replaced?

2722

---

What is the loss of power of transformer 220kv/33kv,63/80mva of % imp12.05 at 80%load

1841

---

Incoming line 11kv And transformer capacity is 2500kva. Consumption load is 1300A. Then fuse capacity is 11kv line.

1679

---

what is mean by PIR in circuitbreaker and give me detail of that?

3532

---

WHAT IS MEANT BY INSULATION CLEARANCE IN VACCUM?

1989

---

can we conduct the swineburne's test on a dc series motor? why?

2157

---

What is the necessary condition for stability.

1226

---

what is doid

2827

---

Draw transformer phasor diagram.(full load,no load)

4190

---