Flow is a continuos process of flowing of any liquid. 
Differential pressure is the pressure difference between 
Suction pressure and Discharge pressure.

pressure drop across the flow element is proportional to 
the square of the flow rate

Flow is proportional to the square root of differential 
pressure.

If we are using "restricted type flow mesurement principle 
such as Orifice, Ventuary, V-Cone flow meters, anu-bar etc. 
then the Pressure drop across the element i.e. delat P, 
then Flow is proportional to the square root of 
differential 
pressure.

When a mass flows through a vibrating pipe, Coriolis forces 
are generated which bend and twist the pipe. These very 
small pipe deformations are measured by optimally mounted 
sensors and electronically evaluated. Because the measured 
phase shift of the sensor signals is proportional to the 
mass flowrate, the Coriolis Mass Flowmeter measures the 
mass flowrate in the flowmeter directly.

The cables can be XLPE , PVC etc insulated. now during the 
testing the high voltage is applied to the cable and to 
test the cable for rupture.Normally the operating voltage 
of the cable can be in 1000 volts , but the test voltage is 
in KV's e.g 11kv for the short duration.

Voltage which can carry by cable without getting shock to 
person.

It is the property of a cable by virtue of it can withstand 
the applied voltage without rupturing it is known as 
insulation level of the cable.

pls send me the exact answers thanx

NCT selected by based on rating of 
transformer                                                 
  

Netural CT - Netural current Transformer it can used in 
transformer side only 
it purpose when a current comes reverse through netural 
side means it should sense by current transformer only.
then CT secondary can be connected to relay (ie.,)Earth 
Fault Relay. when a current is high means it will sense 
then coil will enegrised and gave trip command to breaker.

it is one of the protection of transformer from fault.

Neutral is used to complete the circuit while earthing is a 
return path for leakage current

earthing is physically connecting to earth where as ground
or neutral is any reference value it could be zero

Neutral is used to complete the return path for the circuit 
while earthing is a path for Fault/leakage current.

power used in da loads are real and that being wasted culd
be termed as reactive.real is da useful one.

reactive power is actually a useful power,which is used for 
boosting up of voltages,it is the stored energy...
(capacitors),injection of reactive power is necessary at 
some cases.

Alternating current
In alternating current circuits, energy storage elements 
such as inductance and capacitance may result in periodic 
reversals of the direction of energy flow. The portion of 
power flow that, averaged over a complete cycle of the AC 
waveform, results in net transfer of energy in one 
direction is known as real power (also referred to as 
active power). That portion of power flow due to stored 
energy, that returns to the source in each cycle, is known 
as reactive power.

 
Power triangle The components of AC powerThe relationship 
between real power, reactive power and apparent power can 
be expressed by representing the quantities as vectors. 
Real power is represented as a horizontal vector and 
reactive power is represented as a vertical vector. The 
apparent power vector is the hypotenuse of a right triangle 
formed by connecting the real and reactive power vectors. 
This representation is often called the power triangle. 
Using the Pythagorean Theorem, the relationship among real, 
reactive and apparent power is:

(apparent power)2 = (real power)2 + (reactive power)2 
Real and reactive powers can also be calculated directly 
from the apparent power, when the current and voltage are 
both sinusoids with a known phase angle between them:

(real power) = (apparent power) * cos(theta) 
(reactive power) = (apparent power) * sin(theta) 
The ratio of real power to apparent power is called power 
factor and is a number always between 0 and 1.

To know the Power Triangle & the above concept here is the
hyperlink for this sub:
http://en.wikipedia.org/wiki/Power_factor#Importance_of_powe
r_factor_in_distribution_systems

Real power is active powe whichis used to do work or to 
produce energy & it is V*A*Cos phi whreas reactive power is 
the power which is used to magnetise the magnetic field in 
electrical motors,transformers,electrical ballasts etc..and 
it is V*A*sin phi

make the calibration set up ,  to get -60  , give 60 in lp 
sidethen adjust zero screw, give 20  in lp side toget -20 
url , and adjust span screw.

if you see the voltage level between earth and neutral is 
approx 2to3v
this is becoz
earth is at potential zero
but neutral is not at exact zero
it is zero volt with respect to phase but is floating with 
respect to earth

approx 2to3v

The  neutral is connected to earth at the feeder 
transformer. The neutral current (from single phase or 
unbalanced loads) flowing through the resistance of the 
neutral conductors between your position and the 
transformer raises your neutral to earth potential 
accordingly.

I think use of  colour coding for three phase system is 
only for identification . you can use other colour code 
also.

The color coding in a conductor is only for identification 
purpose.there is no other technical reason for that.

It is just a convention and nothing else.

in other country  in place of RYB  other convention is also 
used



please tell me ur email ID

First- for Identification Purpose
Second- RYB Electrical standard so every common pepole can 
identify
third -All motor or other end side device are mention with 
RYB only so they maintain the same in phase system

Frequency meter need to connect parallel with the circuit,
as its a sensing device.

there is no such 3 phase frequency meters, measuring from
one phase is more than enough.

phase to neutral