My friend has
faced this
question! I
don't know
clearly. So
please anyone
give me the
correct and
short answer to
this question?
What is variable
frequency drive?
Types, what is
star to delta?
Why this
arrangement
necessary?




Answers were Sorted based on User's Feedback



My friend has faced this question! I don't know clearly. So please anyone give me t..

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

My friend has faced this question! I don't know clearly. So please anyone give me t..

Answer / rawjaw

We know a relation speed
say,N=120f/p,speed directly
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
energy efficient.ok..

Is This Answer Correct ?    4 Yes 2 No

My friend has faced this question! I don't know clearly. So please anyone give me t..

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




My friend has faced this question! I don't know clearly. So please anyone give me t..

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

My friend has faced this question! I don't know clearly. So please anyone give me t..

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

Post New Answer



More Instrumentation Interview Questions

Do you have reference list?

0 Answers  


What is stripper & spilitter ? Diffrence in this.?

0 Answers   JSW,


how do u calibrate the vacuum transmitter if it shows more reading

0 Answers  


Difference between ultra sonic flow meter

0 Answers  


i feel sq. pipe is better than round pipe pls give comment for this. advance thanks for reply

3 Answers  






please send the drdo exam paper

0 Answers   DRDO,


What should we do when Fisher Fieldvue DVC2000 give some out put air at 4mA bt at that i need no out put

1 Answers  


1)What is the suitable MOC for flow meters working at temperature between 200 - 250 cen. 2)In which application the mass flow meters are not advisable 3)Is it advisable to use radiation type or radar type instrument for non contact application

1 Answers  


Draw a simple circuit for a well head control panel used to protect the well against fire, leak, blockage, ESD, & controls the operation of one downhole & one surface safety valve. Explain the operation and controls

0 Answers  


please tell no. & add. of consultancy who recruit me in power plant as instrumen engg. present i m working in power plant as ass.t instrument engg. thanku mahesh 09226562826

0 Answers  


In my plant I want to mount a steam flow transmitter .Flow nozzel is already mounted in steam line .So how can i know the range to put in flow transmitter?

1 Answers  


Can 2 transmitters be connected to Integral orifice meter taps? Does an integral orifice comes with 2 set of taps?

1 Answers  






Categories
  • Civil Engineering Interview Questions Civil Engineering (4637)
  • Mechanical Engineering Interview Questions Mechanical Engineering (3700)
  • Electrical Engineering Interview Questions Electrical Engineering (15769)
  • Electronics Communications Interview Questions Electronics Communications (2637)
  • Chemical Engineering Interview Questions Chemical Engineering (762)
  • Aeronautical Engineering Interview Questions Aeronautical Engineering (79)
  • Bio Engineering Interview Questions Bio Engineering (30)
  • Metallurgy Interview Questions Metallurgy (95)
  • Industrial Engineering Interview Questions Industrial Engineering (199)
  • Instrumentation Interview Questions Instrumentation (2879)
  • Automobile Engineering Interview Questions Automobile Engineering (171)
  • Mechatronics Engineering Interview Questions Mechatronics Engineering (41)
  • Marine Engineering Interview Questions Marine Engineering (62)
  • Power Plant Engineering Interview Questions Power Plant Engineering (170)
  • Engineering AllOther Interview Questions Engineering AllOther (1334)