Answer Posted / masoom raza

1)when electrical current passes through our body
then it interacts with electrical impulse in our
body due to which our muscles contracts and expand (depending on type of current i.e ac or dc ,in dc
it contracts while ac in ac it contracts and expands
but very high speed depends on frequency),its called
shock.
in case of electrical train, it is grounded through wheel
so current follows that path(train body to wheel)
rather through our body. so didn't feel shock.
2)transformer noise is due magnetostriction (expansion
and contraction of core in high frequency as in ac
polarity changes rapidly ,i.e it has frequency).
3) transmission line carries high power, have no
insulation ,low frequency operation
communication line carries low power signal,have
insulation
,high frequency operation.
4) transformer oil is usually made from petroleum as it having high Di-electrical strength and high temperature rating and it is less reactive then normal oil.
sorry friend i don't know exactly name of test.
its probably dielectrical strength test.

can anybody tell me that for p.f. Improvment we use capacitor banks but how to decide its capacitance. As we all know how to calculate kvar but what abt capacitance value

1817

---

how to find the torque of the single phase synchronous motor by doing an experiment

1893

---

if in 3-phase system voltage=440V,frequency=60Hz, current=400A. then if it is single phase then current=? and if it is single phasing then current=?

2489

---

234 MVA Generator 3 phase Short circuit current Values required? Gen set Rating-234 MVA, Gen Voltage-18kv, PF;0.8, Xdv:23.5 %, Transformer Rating-18/380KV, 680MVA,Yndd1 two winding, Step up TR, ZT:35.50 %,X/R 4.33 Gen CB Position, CB open ,Disconnected open, Generator Running Voltage 18 Kv, Bi mistakes generator side earth switch Closed during that time short circuit current level in 3 Phase required, and how to test on site 234MVA Generator Short circuit current,

1977

---

please send me the previous year's question papers of jindal GET exams

5862

---

I have made a 3 phase thyristor full bridge rectifier. But at the moment it is working only for the half bridge operation. Both the half bridges are on operation separately but when i put it into full bridge operation the oscilloscope output is zero. I rechecked that the pulses are correct for each thyristor. what could be the possible reason for this?

1892

---

can mini-curcuit supply MIL-tested transformer !

2079

---

Is it possible to measure correct value of earth resistance & cable insulation ristance with out disconncting earth lead & both sides of cable ends? If not, any other method to measure ER & CIR with out disconneting from the system.

2061

---

hi frnds can any one help me ? plz send me placement paper of IOCL of Electrical streem .... plz send ....its urgent....

1670

---

what is the disadvantages of common earthing for AC and DC equipment? (i am talking about inverter control room and inverter duty transformer earthing is common...?)

1599

---

What type of fittings and electrical accessories can be install in radiation area ?

1697

---

As per standard, transformer body earthing and other Equipment earthing (Equipment earthing) did not connect. but in LT side termination we are doing metal glanding in both side Transformer to PCC Panel through armoured cable, now X'mer body earthing and PCC Pane earthing (Equipment earthing) both are connect.is this safe for X'mer or other equipment?

1727

---

In HI POT test what is reason for applying the AC VOLTS and DC VOLTS in different applications what is the nessesity for this ?

1884

---

How I calculate the ELCB for circuit breakers?

2114

---

what is the working process of over & under voltage relay.

2175

---