Interview Questions.

Q1. In Order To Increase Efficiency And Reduce Co Emissions And Other Emissions, Clear Coal Technologies Are Receiving Major Attention. What Are These ?

Advanced pulverised and pressurised pulverised gas combustion.

Atmospheric fluidised bed combustion and pressurised fluidised bed combustion.

Supercritical boilers.

Integrated gasification blended cycle structures.

Advanced incorporated gasification, which include fuel mobile structures.

Magneto hydrodynamic power generation.

Q2. What Does Following Alloy Designation Indicate Fg 250 ?

Grey cast iron with tensile electricity of 250 MPa.

Q3. What Are The Losses In A Centrifugal Pump ?

The losses in a centrifugal pump are : Friction losses because of eddies in go with the flow, leakage, friction loss because of rotation of impeller in chamber of water, gland and bearing power losses.

Q4. What Are The Main Factors That Are Responsible For The Formation Of Built Up Edge ?

The predominant factors which can be accountable for the formation of constructed up area are :

Extreme pressure in the reducing zone

High friction inside the device chip interface

High nearby temperature.

Q5. How Does The Head Change In Pipe Flow With Change In Diameter, If Capacity Is Constant?

At consistent capability, head is proportional to

Q6. What Is The Difference Between Geometric, Kinematic, And Dynamic Similarities Between Model And Prototype ?
 

Geometric similarity is mainly for identical form for model and prototype, kinematic similarity is involved with streamline pattern, whereas dynamic similarity issues the ratio of forces.

Q7. What Is The Difference Between Firm Power And Secondary Power In Hydro Power Plants ?

The approximate consistent and continuous strength that's confident at electricity station and would be to be had at some point of the yr is called firm power.

In run-of-the river schemes that are normally designed for % availability of water, the company strength could be to be had for as a minimum % of the years in the course of the life of the scheme. However in some years discharge within the river can be extra than % availability discharge and a few more energy called secondary power may be generated.

Q8. What Is Polytropic Process ? Under What Conditions It Approaches Isobaric, Isothermal, And Isometric Process ? In Which Reversible Process No Work Is Done ?

A polytropic manner is one that follows the equation pun = consistent (index n may additionally have values from - oc to + oo. This procedure strategies isobaric when n = 0, isothermal whilst n = 1, and isometric when n = . No paintings is accomplished in isometric procedure.

Q9. Which Refrigerant Is Used For Ice Plant And Trport Refrigeration ?

Ammonia and CO2 respectively.

Q10. What Is Metacentre ?

Metacentre is the point at the intersection of the buoyancy with the vertical axis of the body.

Q11. Why Steam Is In Open Space And Water Inside Tube In Condensers Used In Power Plants ?

Overall warmness trfer coefficient can be improved via increasing speed of water in tube. Further steam desires greater space because of better particular volume.

Q12. What Is The Difference Between Hard Water And Soft Water ?

Hard water incorporates extra of scale forming impurities and tender water consists of very little or no scale forming materials.

Q13. Proximity Analysis Of Coal Provides Data For A First, General Assessment Of A Coal's Quality And Type. What Elements It Reports ?

Moisture, unstable count number, ash and fixed carbon.

Q14. Briefly Explain The Advantages Of Cycloidal And Involute Gears?

The advantages of the Cycloidal gears are as follows:

Having a wider flank compared to Involute gears they may be considered to have greater strength and as a result can resist in addition load and pressure.

The contact in case of cycloidal gears is between the concave surface and the convex flank. This effects in less put on and tear.

No interference happens in these types of gears.

The blessings of Involute gears are as follows:

The primary gain of involute gears is that it permits the converting of the centre distance of a couple without changing the speed ratio.

The stress attitude stays constant from start to give up enamel, this consequences in less put on and easy walking of the gears.

The involute gears are less complicated to fabricate as they can be generated in a unmarried curve ( the face and flank ).

Q15. On What Factors The Efficiency Of Pump Depends ?

Efficiency of a pump (centrifugal) relies upon on the size, speed, and proportions of the impeller and casing.

Q16. Why Consumption Of Lubricating Oil Is More In Two-stroke Cycle Petrol Engine Than Four-stroke Cycle Petrol Engine ?

In -stroke engine lub oil is blended with petrol and as a consequence a few lub oil is blown out thru the exhaust valves by means of scavenging and charging air. There is not any such wastage in four stroke petrol engine.

Q17. List Two Effects Of Manganese In Plain Carbon Steels?

Manganese increases tensile power and hardness. It decreases weldability.

Q18. What Is Capillarity And When Liquid Rises Or Falls ?

Capillarity : The rise or fall of a liquid in a capillary tube resulting from surface tension. The magnitude of upward push or fall depends on the relative magnitudes of the concord of the liquid and adhesion of the liquid to the walls of the containing vessels. Capillarity is of significance in tubes smaller than 10 mm diameter.

Rise of liquid : Liquids upward thrust (in capillary tube) when they moist and adhesion of the liquid to the walls is more than the cohesion of the liquid.

Fall of liquid : Liquids fall (in capillary tube) when they do not wet and the concord of the liquid is more than the adhesion of the liquid to the partitions.

Q19. We Often Come Across Use Of Jet Pumps In Process Industry ? What Is The Reason For This ?

Jet pumps are clean to preserve and can be used to trport gases, liquids and combinations of each.

Q20. Which Reactor Uses Heavy Water As Moderator ?

CANDU.

Q21. Which Parameter Remains Constant In A Throttling Process ?

Enthalpy.

Q22. What Are The Harmful Effects Of Sulphur In Coal Used For Power Generation ?

Sulphur in coal gives upward push to number of ecological troubles ranging from acid mine drainage to ash waste troubles and air pollution due to SO2 emission. Emission of S02 is the reason of acid rain and is liable for intense environmental harm.

Q23. In Which Type Of Motion, Acceleration Is Directly Proportional To Displacement ?

SHM.

Q24. What Are The Factors To Be Considered While Evaluating The Machinability ?

Tool lifestyles

Rate of metal removal

Power required

Surface texture and length of issue

Temperature of tool (or) chip.

Q25. On What Basis Can Sliding Contact Bearings Be Classified? Explain?

Sliding touch bearings can be categorised on the premise of the thickness of the lubricating agent layer among the bearing and the magazine. They may be categorised as follows:

Thick film bearings: These kind of bearings have their operating surface separated with the aid of a layer of the lubricant. They are also called hydrodynamic lubricated bearings.

Thin film bearings: In this form of bearings the surfaces are partially in direct touch with every other even after the presence of a lubricant. The other call for such kind of bearings is boundary lubricated bearings.

Zero Film Bearings: These form of bearings as their name suggests don't have any lubricant gift between the touch layers.

Externally or hydrostatically pressurized lubricated bearings: These bearings are capable of without any relative motion guide consistent hundreds.

Q26. What Is The Necessary And Sufficient Condition For Bodies In Floatation To Be In Stable Equilibrium ?

Centre of gravity of frame need to be positioned below metacentre.

Q27. Explain The Difference Between Energy Line And Hydraulic Grade Line ?

The strength line is a graphical representation of the energy at each section.

Hydraulic grade line lies under the energy line via an quantity identical to the speed head at the segment.

Q28. For Which Type Of Flow The Velocity Distribution In A Pipe Is Parabolic?

For uniform laminar float.

Q29. What Are The Different Types Of Springs And Explain Them Briefly?

Springs can be widely labeled into the subsequent types:

Helical Springs: These springs as their call suggests are in coil form and are within the shape of helix. The primary purpose of such springs are to deal with compressive and tensile hundreds. They can be similarly classified into  kinds: compression helical spring and anxiety helical spring each having their very own particular regions of software./

Conical and volute springs: Both these spring sorts have specialised areas of utilization in which springs with adaptable charge in keeping with the load is required. In case of conical springs they may be wound to be able to have a uniform pitch at the same time as however volute springs are wound in a moderate way of a paraboloid.

Torsion Springs: The traits of such springs is that they generally tend to wind up by using the load. They can be both helical or spiral in shape. These forms of springs are used in circuit breaker mechanisms.

Leaf springs: These forms of springs are created from metallic plates of various lengths held collectively with the help of bolts and clamps. Commonly seen being used as suspensions for vehicles.

Disc Springs: As the call suggests such types of springs are constructed from conical discs held together through a bolt or tube.

Special Purpose Springs: These springs are all together made of different substances which includes air and water.

Q30. What Are The Three Functions Served By A Surge Tank In A Hydro Plant ?

The 3 functions served via a surge tank are

float law - act as a reservoir for popularity or transport of water to fulfill requirements of load adjustments.

Water-hammer remedy or strain regulation.

Improvement in speed regulation.
 

Q31. What Is Vapour Pressure And When It Becomes Important ?

Vapour stress is the partial stress created via the vapour molecules whilst evaporation takes vicinity inside an enclosed space. It turns into important when negative pressures are involved.

Q32. Explain The Difference Between Horizontal And Vertical Components Of Hydrostatic Force ?

The horizontal element of the hydrostatic pressure on any surface is same to the everyday pressure on the vertical projection of the surface and acts through the middle of strain for the vertical projection.

Vertical component of the hydrostatic pressure on any floor is equal to the load of the quantity of liquid above the vicinity and passes thru the e.G. Of the extent.

Q33. What Do You Mean By Drill Sleeve And A Drill Socket ?

The drill sleeve is appropriate for containing most effective one length of shank. If the taper shank of the device is smaller than the taper in the spindle hole, a taper sleeve is used.

When the taper tool shank is larger than the spindle taper, drill sockets are used to preserve the gear. Drill sockets are much longer in length than the drill sleeves.

Q34. Whether Bernoulli's Equation Is Applicable For Streamline Straight And Rotational Flows ?

Yes.

Q35. How The Characteristics Of Fuel Like Front End Volatility, Mid-range Volatility And Tail End Volatility Affect S.I. Engines ?

These traits have an effect on SI engines in cold starting, icing of carburettor and dilution in crankcase respectively.

Q36. Explain What You Understand By The Term Hydrostatic Paradox ?

Hydrostatic paradox is the phenomenon that the floor load of water in vessels of different shapes wearing water at identical level relies upon simplest on the area of the bottom floor and no longer on the shape of the vessel.

Q37. Explain The Difference Between Rotational And Irrotational Flow?

In rotational waft the vorticity is non zero and in irrotational waft it's miles zero. In irrotational go with the flow the net rotation of a fluid detail approximately its own mass centre is 0 because it moves from one place to another. For it, dv/dx = du/dy.

Q38. What Is The Name Given To Combined Process Of Cooling And Humidifying ?

Evaporative Cooling.

Q39. No.,, Reduction In Gas Turbines Is Challenge To Meet Environmental Regulations. What Measures Are Taken In This Regard ?

NO* in gasoline turbines is controlled through

injecting water/steam into combustor,

using selective catalytic redaction (SCR) and non-catalytic reduction device (NRS), and

higher combustor layout.

Q40. What Are Thermal Neutrons ?

Thermal neutrons are sluggish neutrons (having power below 1 eV) which might be in thermal equilibrium with their surroundings.

Q41. Which Element Is Added In Steel To Increase Resistance To Corrosion ?

Chromium.

Q42. What Is The Criterion For Determining Economic Diameter Of Power Tunnel ?

The monetary diameter of a energy tunnel is decided such that the total fee of following  factors is least

annual loss of revenue attributable to electricity head misplaced due to friction.

Ordinary annual expenditure.

Q43. In Which Type Of Flow The Stream Lines, Streak Lines And Path Lines Are Identical ?

In constant glide.

Q44. Name Pressure Compounded And Velocity Compounded Turbine?

Rateau and Curtis respectively.

Q45. Under What Condition The Thickness Of Thermal Boundary Layer And Hydrodynamic Boundary Layer Is Same ?

When Prandtl number is same to cohesion.

Q46. What Is Factor Of Evaporation ?

It is the ratio of heat change from feed water to steam and the heat of vaporization of steam at atmospheric pressure.

Q47. Why Belts Are Subject To Creep ?

Due to choppy extension and contraction of belt.

Q48. Describe Briefly The Different Cold Drawing Processes?

Some of the crucial cold drawing procedures are as follows:

Bar and Rod Drawing: In the case of bar drawing the hot drawn bars are before everything pickled, washed and coated to save you oxidation. Once this is carried out a draw bench is used for the process of bloodless drawing. In order to make an cease possible to enter a drawing die the diameter of the rod is decreased by the swaging operation. This stop is fixed with the aid of chains to the draw bench and the cease is gripped by way of the jaws of the carriage. In this approach a excessive floor end and accuracy dimensionally is obtained. The products of this method can be used at once with none in addition machining.

Wire Drawing: Similar to the above manner the bars are first pickled, washed and covered to save you any oxidation. After this the rods are handed via numerous dies of decreasing diameter to offer a favored discount within the length ( diameter ). The dies used for the reduction system is generally made from carbide materials.

Tube Drawing: This kind of drawing could be very just like the bar drawing system and in majority of instances it is finished via the usage of a draw bench.

Q49. When Maximum Discharge Is Obtained In Nozzle ?

At the important strain ratio.

Q50. Which Elements Increase The Corrosion Resistance Of Steel ?

Chromium and nickel.