Question { Cologicx Systems, 9202 }

How can we measure and monitor critical performance
parameters of Diesel Generator Sets, both electrical and
engine ?

Answer

We can measure & monitoring bellows points

A) Engine Related
1) Engine RPM
2) Engine oil Pressure
3) Engine oil temperature
4) Coolant level
5) Coolant temp
6) Governor characteristics
7) Battery charger status
8) Battery charging current & its voltage.
9) Engine running HRS
10) Fuel quantity
11) We can monitor like bellow mentioned alarms
a) Starting failure alarm
b) Charger failure alarm
c) Engine over speed alarm
d) Low engine oil pressure alarm
e) Low coolant level alarm
f) Low DC voltage (Battery Voltage)alarm

B) Alternator related (Electrical)
1) Voltage (line to line & line to neutral)
2) Kw
3) KVA
4) Frequency
5) Amps
6) KW Hrs
7) Pf
We can monitor like bellow mentioned alarms
a) Acb Breaker fail to close alarm
b) Over voltage alarm.

These we can Monitor at computer through software & modbus
converter. Rs 485 0r Rs 232

Question { 5180 }

What is fiber optical cable and it's utilization

Answer

Fiber optic cable is used for data transfering.
it is made of glass & it will no bend 90 Degree.


Shriram......

Question { Accenture, 72540 }

1. what is difference between VCB and ACB.how its works
please explian.

Answer

VCB means vacuum circuit breaker it used in high voltage
(HV) lines
It has one mechanism in this mechanism spring is there it
is connected with small electric motor for charging the
spring but we can do manually charge also by this spring
tension circuit closing or circuit open can be done. The
circuit closing can be done by (CC closing coil) also.
In VCB CT are used for measuring, controlling & protection
purpose.

ACB means air circuit breaker it is used in low voltage
(LV) lines
It has also one mechanism it also work same.
ACB has (UV Under voltage) it used for tripping purpose
when power fail.
It has (CC Closing coil) for closing the circuit.
CT are used for measuring, controlling & protection purpose

Question { Indian Military Services, 5615 }

what are smoke detectors ?

Answer

Smoke Detector it is one device it is used for fire alarm
purpose.
These are connected to fire panel in loop & they have
individual addrace for identification at where fire is
occurred

Its Main function is that to give the signal at fire panel
when fire occurs

Shriram………

Question { 5614 }

Why is it that variation allowed in supply voltage to
motors is (+ or -)10 %, whereas that in frequency is (+ or -
)5 %

Answer

For the motor we are not using ups power supply

In ups power supply, we can maintain the voltage as well as
frequency.

But we are using raw power for motors in plants.

Eg if I we are using some load. Now I getting 415 volts at
full load if I reduce some load any reasons then voltage
will lightly increase so voltage will not stay constant.

For that reasons operating voltage +/- 10 %

Shriram....

Question { Biocon, 32316 }

1)Why Bearing used in Motor and pumps.

2) Why Mechanical seal used in Pumps.

Answer

1) Bearing is used For reducing friction & driver torque.
2)For not getting leak.

Is it right?

Question { 36666 }

What is the major difference between cnc and plc. why cant
we use plc instead of cnc

Answer

Plc Means Programmable logic control.

CNC Means Computerized numerical control.

CNC used for controlling the movement by numerical value.
now adays it widely used in automatic machines like CNC
Lathe, horizontal, vertical machining center.

Question { 8582 }

What is difference between ball screw and lead screw.

Answer

Function of lead screw & ball screw are same like nut & bolt
Lead screw means it one threaded screw.

Lead screw used for conventional machines like lath,
sapping, drilling machines
Lead screw gives 20-micron accuracy & it has wear & tear is
more as compare to ball screw.

Ball screw used where high accuracy & performance required
like in CNC machining center. In ball screw balls are used
for smooth operation in this case
Wear & tear is less as compare to lead screw.

Question { 9617 }

How to calculate the TR (AC's)

Answer

3000 Calories equals to 1 TR
in heat 3.5172 KW equals to 1 TR


Shriram....

Question { KSEB, 15594 }

what is power factor
?

Answer

This is the angle in between voltage & current.
it generate at inductive & capacitive load.The power factor
we can maintain by capacitors,it should be near 0.95 to 0.99


Shriram.........

Question { 10154 }

I am an electrical power engineer and arranged power system
for a data center, I installed MCB, ELCB and erthing system
TN-C-S.
But some times several ELCBs Disconnect circuits at the
same time! what may be the reason? (the ELCBs are 25A ,30mA)

Answer

ELCBs Disconnect circuits at the power fluctuation time or
any other reason????

Question { MahaGenco, 5591 }

A 60W,250V bulb when connected to a 230V supply will it give
more light or less or will be give normal light?

Answer

Brightness will little bit more

Question { MahaGenco, 5591 }

A 60W,250V bulb when connected to a 230V supply will it give
more light or less or will be give normal light?

Answer

Brightness will less