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Question
what is axial shift n what is differential expansion in 
turbine?
how many sensor probes r mounted for this n how it works?
 Question Submitted By :: Instrumentation
I also faced this Question!!     Answer Posted By  
 
Answer
# 1
axial shift of a steam turbine is the shifting of turbine rotor in the forward and backward direction due to steam thrust on blades of rotor.
Thermal expansion of the shaft would be in an axial direction away from the thrust bearing. The thrust bearing prevents axial movement due to pressure differentials across each stage wheel and the dynamic reactions in the "buckets".
IF a large , high pressure turbine shaft will have a thermal growth of 0.20" the thrust bearing will be set-up 0.20" "short" and when pre-run warmup is completed the shaft will have ("shifted") to be in nearly optimum position for the operating clearances.
 
Is This Answer Correct ?    8 Yes 8 No
Iftikhar Ahmed
 

 
 
 
Other Instrumentation Interview Questions
 
  Question Asked @ Answers
 
any body tell me ,contol valve has how many cheractristic? explain it. L&T 5
what is purpose of three way manifold valve using for dp transmitter   1
what is the function of boiler in plant? Maden 2
what is the principal of coriolis mass flowmeter   1
why r using 250 resistances SABIC 1
square root calculation for dp flow transmitter? give me a explanation with example   3
why full bore ball valve is not used in steam applications?   1
what is the input to be given digital temp controller during the the calibration time?   2
Describe the concept of Gain Scheduling, as currently found as an option in some controllers.   1
what is the difference between sinking and sourcing inputs and also what are there applications?   2
what is meant by calibration Exxon-Mobil 18
1. what is 3 point calibration & 5 point calibration? 2. If we use hart communicator to set the LRV & URV of a smart transmitter, did we calibrate the transmitter? why? 3. Make a complet list if meterials needed to properly connect a pressure gauge to a steam pipe using 1/2 inch stainless steel tubing. The gauge connections is 1/2 inch NPT-M and the steam pipe tap has a 1/2 inch female coupling, compression fittings are use. 4. What are the tools in loop checking? 5. What would the ISA symbol of a square root extractor look like? 6. What would you do to completely prepare for the configuration? 7. What safety measures must you undertake when doing configuration? 8. what are the two most commonly use programming languages used when we configure a PLC? 9. What would you do if you accidentally skipped a step in the configuration procedure? 10. How would you know if the configuration were sucessful? 11. Name at least 3 selections available when we configure the burnout protection of a controller?   2
 
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