Interview Questions.

Question 1. How Cavitation Can Be Eliminated In A Pump?

Answer :

Cavitation way bubbles are forming in the liquid.

To keep away from Cavitation, we ought to growth the Pump length to One or Two Inch;
To boom the strain of the Suction Head, or
Decrease the Pump Speed.
Question 2. Which Pump Is More Efficient Centrifugal Pump Or Reciprocating Pump?

Answer :

Centrifugal pump. Because drift charge is better compared to reciprocating pump. Flow is clean and it calls for less area to install. Lower preliminary fee and lower upkeep price.

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Question 3. Why Centrifugal Pump Is Not Called As A Positive Displacement Type Of Pump?

Answer :

The centrifugal has various go with the flow depending on strain or head, whereas the Positive Displacement pump has greater or much less constant flow regardless of stress.

Likewise viscosity is constant for superb displacement pump wherein centrifugal pump have up and down value due to the fact the better viscosity liquids fill the clearances of the pump inflicting a higher volumetric performance. When there's a viscosity exchange in supply there may be also extra loss inside the system. This means trade in pump float laid low with the stress exchange.

One more example is, positive displacement pump has more or less regular efficiency, in which centrifugal pump has varying efficiency rate.

Question 4. Why The Centrifugal Pump Is Called High Discharge Pump?

Answer :

Centrifugal pump is a kinetic tool. The centrifugal pump uses the centrifugal pressure to push out the fluid. So the liquid getting into the pump receives kinetic electricity from the rotating impeller. The centrifugal movement of the impeller quickens the liquid to a high pace, shifting mechanical (rotational) strength to the liquid. So it discharges the liquid in excessive rate. It is given in the following formulae:

Centrifugal pressure F= (M*V2)/R.

Where,
M-Mass
V-Velocity
R-Radius

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Question 5. Why Cavitation Will Occur In Centrifugal Pumps And Not In Displacement Pumps?

Answer :

The formation of cavities (or bubbles) is precipitated by means of flow separation, or non-uniform glide velocities, interior a pump casing. In centrifugal pumps the eye of the pump impeller is smaller than the drift area of pipe. This lower in glide vicinity of pump consequences in boom in go with the flow fee. So pressure drop happened among pump suction and the vanes of the impeller. Here air bubbles or cavities are shaped because of liquid vapour because of growth in temperature in impeller. This air bubbles are transmitted to pump which paperwork cavitation.

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Question 6. What Is A Radialflow Turbine?

Answer :

In a radialflow turbine, steam flows outward from the shaft to the casing. The unit is usually a reaction unit, having each constant and shifting blades.

Question 7. What Are Four Types Of Turbine Seals?

Answer :

Carbon earrings geared up in segments across the shaft and held together by means of garter or retainer springs.
Labyrinth mated with shaft serration’s or shaft seal strips.
Water seals where a shaft runner acts as a pump to create a ring of water across the shaft. Use most effective treated water to keep away from shaft pitting.
Stuffing container the use of woven or tender packing jewelry which can be compressed with a gland to save you leakage alongside the shaft.
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Question eight. What Are Two Types Of Clearance In A Turbine?

Answer :

Radial – clearance at the suggestions of the rotor and casing.
Axial – the foreandaft
clearance, at the perimeters of the rotor and the casing.

Question 9. What Is The Function Of A Thrust Bearing?

Answer :

Thrust bearings maintain the rotor in its correct axial role.

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Question 10. What Is A Stage In A Steam Turbine?

Answer :

In an impulse turbine, the degree is a set of moving blades in the back of the nozzle. In a reaction turbine, each row of blades is known as a "degree." A unmarried Curtis stage may encompass  or more rows of moving blades.

Question 11. What Is A Diaphragm?

Answer :

Partitions among pressure tiers in a turbine’s casing are known as diaphragms. They maintain the vaneshaped nozzles and seals between the ranges. Usually labyrinthtype seals are used. Onehalf of the diaphragm is equipped into the top of the casing, the alternative 1/2 into the lowest.

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Question 12. What Are The Two Basic Types Of Steam Turbines?

Answer :

Impulse type.
Reaction type.
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Question thirteen. What Are Topping And Superposed Turbines?

Answer :

Topping and superposed generators arc highpressure, noncondensing units that can be added to an older, moderatepressure plant. Topping turbines acquire highpressure steam from new highpressure boilers. The exhaust steam of the brand new turbine has the same pressure because the vintage boilers and is used to deliver the old generators.

Question 14. What Is A Combination Thrust And Radial Bearing?

Answer :

This unit has the ends of the Babbitt bearing extended substantially over the quit of the shell. Collars on the rotor face those thrust pads, and the magazine is supported in the bearing among the thrust collars.

Question 15. What Is Cavitation?

Answer :

Cavitation is the formation of vapor cavities (Air bubbles) in a liquid.

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Question sixteen. What Is Positive Displacement Pump?

Answer :

Positive displacement pumps are those who operate by means of forcing a set extent of fluid from the inlet strain phase of the pump into the discharge area of the pump.

Question 17. What Is Kinematic Viscosity?

Answer :

The kinematic viscosity is the ratio of absolute viscosity to the density of the liquid.

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Question 18. Differentiate Between The Uniform Flow And Non-uniform Flow?

Answer :

Uniform Flow: The glide is described as uniform drift when inside the drift field the velocity and different hydrodynamic parameters do now not exchange from point to factor at any instant of time.

Non-Uniform Flow: When the speed and other hydrodynamic parameters adjustments from one factor to any other the go with the flow is de????ned as non-uniform float.

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Question 19. What Is The Difference Between The Unsteady Uniform Flow And Steady Uniform Flow?

Answer :

Unsteady uniform flow - adjustments with time.

Steady uniform flow - does no longer exchange with time.

Question 20. What Is Coefficient Of Contraction?

Answer :

Coefficient of contraction is the ratio of area of jet at vena contracta to the location of orifice.

The traditional value may be taken as 0.Sixty four for a pointy orifice (concentric with the go with the flow channel). The smaller the price, the extra impact the vena contracta has.

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