Answer Posted / ramesh kumar k

Electrically... there is no problem... until the rotor
position disturbs...
but there is a chance for that... as the lower side bearing
will have to bear all the rotor weight.. and that also the
force acting on the bearing will not be in proper
direction... so first the bearings will gets damaged... and
then position of the rotor will be disturbed...so there
willl not be smooth operation of the motor.....

After taking shutdown of 11kv feeder, if you see 5kv by phasing stick in the cable side, is it possible to close earth switch in cable.

2342

---

Pls explan the OLR setting in VCB at HT yard

2670

---

What is the permissable nutral current of three phase system as per IS standards?

2086

---

what is the practical application of full adder circuit?

1836

---

what is sevice settings for mccb?How can be it setted?

2201

---

I just purchased a 4 position cam switch to be used to operate a 3-speed blower motor. The motor is a 10 amp motor and has 3 wires that are used to control speed. The cam switch was rated at 660V 20 amps but when I received it, I noticed that it has AC-15 operational current rating (Ie) of 4/5 amps. If I am reading the label correctly. the 4/5 amps is related to 440v/220V (Ue). Other ratings are AC-3: 5.5A, AC2: 7.5A and AC-4: 1.5A. My questions are 1) Is it safe to use this switch with the motor I have 2) what is the difference between the 20 amp Ith ratting and the Ie operational ratings?

1728

---

1. A 380 / 220 V r.m.s. 3-phase 4-wire circuit carries loads of 8 + j8.1 ohm; 4 + j4.1 ohm; and 2 +j2.1 ohmin the three phases respectively. The length of the circuit is 100 m, and the resistivity of the phase conductors is 0.0005 Ω/m. The neutral conductor is of the same size as the phase conductors. a) Select a reference angle 0for the first phase. Then write down the three phase voltages in both polar format and complex number format. b) Make appropriate assumptions, and take temperature effects on resistance is insignificant. Calculate the currents in the three phases. (Note: Determine conductor resistance, and apply Kirchhoff’s Voltage Law) Based on the result, suggest a main switch rating for the circuit. c) Show your preferred direction of neutral current in a diagram, and then determine its value. (Note: Apply superposition principle, and Kirchhoff’s Current Law) Use its magnitude to show that in this circuit, the unbalanced load may increase the voltage drop in some of the phases. (Note: Also observe the common volt drip in neutral) State your assumptions, if there are any. d) Suddenly the neutral wire of the circuit is broken. Estimate the new currents in the first phase, i.e. Phase L1. State your assumptions, if there are any.

2013

---

primery try cell?

2176

---

How generating electric power export to grid from the generating station ?

1859

---

why lightning arrestor are made in two stack of insulator but why not cvt

2061

---

What are the function of different components of servo motor?

2019

---

how does it help for selection of a transformer.

1842

---

I am inpecting a 10kVA UPS what tests should i do and should i observe?

2205

---

can i connect REF and Differencial relay in 1 CT core for transformer protection?

1902

---

What is force on parallel conductors ?

1059

---