My friend has
give me the
short answer to
What is variable
Types, what is
star to delta?
Answers were Sorted based on User's Feedback
Answer / vasu
VFD are used to make the motor to run in desired speed. By
variying the input supply frequency we can vary the speed of
the motor. some other types are VVFD - Variable voltage and
frequency drive, Vector drive.
|Is This Answer Correct ?||4 Yes||0 No|
Answer / rawjaw
We know a relation speed
proportional to freq.In some
applications large motors
used to drive a heavy load,we
start such motors from 0 rpm
& provides initial torque(say
160%) in order to achieve
|Is This Answer Correct ?||4 Yes||2 No|
Answer / hitesh kareliya
VFD Means Variable Frequency Drive,So that means we
controll the Pump's RPM via VFD in desired frequency.
|Is This Answer Correct ?||1 Yes||0 No|
Answer / amit shetkar
see firstly vfd is basically used mainly for 2 purpose i.e to
protect electrical motors & for speed control.
& now about that star delta arrangement it used before motor
in that star connection is used to give smooth start to motor
& when motor achieve it's speed so to maintain that speed
delta connection is used
|Is This Answer Correct ?||0 Yes||0 No|
Answer / vinay singh
When the elements are connected in neither series nor parallel
to reduce network star delta arrangement is used.
|Is This Answer Correct ?||0 Yes||1 No|
If a control valve is hunting means means if we are giving 50% to the cv, the cv will open at 51% then slowly slwoly it will reaches 49% , so what to do for solve this problem. The cv is double acting and mounted for anti surge operation, it having 4 nos. volume booster, one sov, one positioner, etc..?
Whether the DP transmitter can be utilised in the medium of Vaccum for the measurement of Level?
How to check electrical health of Vibration probe?
How we can check the 2 wire proxy switch? & how it is connected to DI MODULE OF PLC?
Explain about SOURCING & SINKING concepts in PLC to field sensor wiring ?
how to calibrate and troubleshooting of leveltroll?
How to convert 0-2500mmH2o into kg/hr? Or how to convert mmH2O into kg/hr,t/hr etc
WHAT IS MEANT BY PROJECT MANAGEMENT STRATEGIES IN INSTRUMENTATION?
how we can calibrate split range control valve?
Somebody ask me how many size of control valve what is mean of control valve size?
how will do square root transmitter calibration