Answer / vinay mishra

Every pump ie designed on certain temp. of liq. further at
certain vapour pressure of liquid . if pressure at suction
line of pump becomes low means pressure reduce below vapour
pressure then cavity or coalapse of bubble will occour on
eye of impellor this phenomenon is called as cavitation ,
if their will cavitation in pump following event occour
1. it can harm the vanes of impellor
2. viberation or noise can reduce bearing or seal life
3. it reduce the pump performance
so to avoid above event the pressure will be alaways
exceeds some value above vapour pressur in the suction line
of pump , npsh is a characteristic of pump design
so NPSH is define as difference of net suction head and
head due to vapour preessure.
so NPSH is alaways greater than NPSHR

Answer / ganesh r.k

Net positive suction head(NPSH)

How to calculate the quantity of Grease applying in all bearing?is there any fix formula for this.

2 Answers  

---

please briefly explain the Discharge process and Formula of Centrifugal Pump

0 Answers   AA Enterprises, CPWD, Disha Industries,

---

Inspection for intermediate shaft bearing.

1 Answers   RRB,

---

Give an example of a time when you had to explain some new procedures to your co-workers for quality service delivery. How did you go about it?

0 Answers   Ex-Solite Oilfield and Engineering, Schwing Stetter,

---

Which bearing offers lowest friction?

5 Answers  

---

pulley forms which pair?

3 Answers   BEL, Gujarat Guardian,

---

As a foreign applicant, what do you understand about our company before sending your application CV for consideration?

0 Answers   Nexel,

---

Define thermostate and thermocouple.

3 Answers  

---

Respected Sir, Please send me the technical question paper of ONGC of mechanical branch.I m in urgent need of it.

7 Answers   NTPC, ONGC,

---

function and working of ABS?

2 Answers  

---

what is the trignometry of lifting tools using the wire rope ? any formula for trignometry ?

0 Answers   GE, ONGC,

---

What is difference between conjugate beam and continuous beam ?

0 Answers  

---