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what is the ms flat constant for calculating earth mat design calculation?

635

what is cogging and crawling

668

1- XC and the RC time constant are both measures of the
reaction of C to a change in ____?
2-The power factor is a numerical ratio with a value
between 0 and 1 equal to the ______________ of the phase
angle.
3-When V and I are out of phase because of reactance, the
product of V times I is called ______________ power
4-For _____________ inductors, the branch currents can be
added algebraically.
5- The ______________ power in watts can be calculated as
I^2R
6-Calculate XL with L = 30mH and f = 1kHz ( I have Xl=2piFL
2*3.141592653*1kHz*30mH
=188 ohms Please check)
7-A parallel RL circuit has the values, R = 5kohms, XL =
5kohms. A voltage source of Vt = 10Vrms is connected in
parallel to R and L. Determine the total current, It
delivered by the voltage source Vt.
8-A series RC circuit has R = 1Mohm and C = 1microF. How
long would it take for the capacitor to fully discharge if
it is initially fully charged?
9-A circuit has real power = 300W and an apparent power of
500VA. Determine the power factor and phase angle.
10-The time constant for an LR series circuit is T = 0.1s
and R = 10ohms. Calculate the inductance L.

1188

can anyone show me how the 3 phase power is supplied to
socket outlets?

267

line diagram for mcb , mccb , rccb .

4382

What is method of calculating the fault current for a MDB,
50KW, 3PH, 415V, 50HZ?

512

How many kinds of E.L.C.B and how to work E.L.C.B

357

where this neutral connection goes after returning from the
load(home ,factory,industries).Is it grounded at the
transformer side or atthe generator side .If it is grounded
then we also ground the earth connection.is there any
problem with this.

335

How can we select suitable capacity generator for three
phase load (inductive load) and how to take study analysis
in 3 three phase load system ?

367

Please brief working principle & construction of permanent
magnet AC Servo motor

516

what is 30-phase of transformer

189

how to control the speed to switched reluctance motor

333

Advantage of LT panel vs HT panel

362

I am about to write exam in RRB bangalore for the post of
section engineer.please provide me with previous exam
questions

352

how copper and aluminium wires or cables are choose for
current rating? please provide copper and aluminium wire
selection chart for different current rating ?