In the Variable Voltage Variable Frequency Drive, how the Voltage and Frequency varied ? Is it varied in the Inverter part of the Drive ? Please give us supporting document if any.

1917

i want to model paper for section engg.

1974

WHY SEPARATELY EXCITED MACHINE NEEDS EXCITATION BY DC SUPPLY WHY NOT BY AC

1851

There are Two questions about Steam Turbine Generator... What is HRSG bypass of LP, HP used for in power generation? In particualar, in the event that fault of HP bypass, there would be STG TRIP in operation but none on the LP bypass fault...what's the reason ?

2278

state the disadvantages of carbon filament???

2871

What are the causes of unbalanced current on 34.5kv feeder Ia=0.05,Ib= 0.25, Ic=0.15 and In=0.27 prior to tripping current are balance?

1700

HOW TO TEST A LIGHTENING ARREST ER ?

2170

If 24 KVA AVR having Input voltage 200-400v, Output voltage 415+-1%, what will be the voltage if Load is 13A.

2059

How to test Alternator stability test for REF relay

1447

wow to calculate the transformer rating(KVA)

2223

What are your future plans for the company if permanently employed?

2121

When calculation of fault current and fault Kva is to be done,why always we use per unit value and why we consider the base kva?

1863

Explain the following and how these are working with PLC Unit 1 I/O Module Card 2 Adaptor Card 3 Ribbon Adaptor 4 I/O bus 5 I/O Devices

1584

The ripple frequency in output of fullwave bridge rectifier is a. Half the input b. Twice the input c. Same as input

2230

Dear Respected sir how to test ABB REX521 protection relay by relay tester.

2701