QUESTIONAIRE

1. With increase in temperature viscosity of a liquid a) Increases b) Decreases c) Remains constant d) May increase or decrease depending on liquids

2. Cavitation occurs in a centrifugal pump when a) suction presuure < vapor pressure of liquid at that temperature b) suction presuure > vapor pressure of liquid at that temperature c) suction pressure = vapor pressure d) suction pressure = developed head

3. Centrifugal pumps are normaly used for pumping a) Gas b) Liquids c) Gas & Liquid mixture

4. Check valve is used for a) Very precise control of flow b) Unidirectional flow c) Multidirectional flow d) None of these

5. Purpose of relief valve in a reciprocating pump is to a) Protect pump against developing excess pressure b) Facilitate uni-directional flow c) Reduce discharge pressure d) Control the rate of discharge

6. The schedule number of a pipe is an indication of its a) Size b) Roughness c) Material density d) Wall thickness

7. Differential manometer measures a) Absolute pressure b) Gauge pressure c) Pressure difference d) Pressure gradient

8. Compressors are used a) To increase pressure of gas b) To increase velocity of gas c) To increase temperature of gas d) None of the above

9. Which of the following facilitates close control of flow of fluids a) Gate valve b) Globe valve c) Butterfly valve d) Check valve

10. Baffles in mixing tanks are provided to a) Reduce swirling and vortex formation b) Increase structural strength of tank c) Aid in rotational flow d) None of these

11. Cyclones are used primarily to separate a) Solids from fluids b) Liquids from liquids c) Solids from solids d) None of these

12. Octane number of gasoline is a measure of its a) Knocking tendency b) Ignition delay c) Ignition temperature d) Smoke point

13. Viscosity index a) is the measure of flash point b) is the measure of variation of viscosity with temperature c) of a lubricating oil should be low d) None of these

14. Isomerisation a) Converts paraffins to iso paraffins b) Olefins to iso paraffins c) Napthenes to iso paraffins d) None of these

15. Butadiene is a) di-olefin b) napthene c) aromatic d) olefin

16. Higher boiling fractions are distilled under vacuum at lower temperature because of a) thermal cracking b) gum formation c) discoloration d) none of the above

17. Liquefied petroleum gas is a mixture of a) propane and butane b) butane and ethane c) methane and ethane d) mathane and carbon monoxide

18. Fourier’s law applies to a) conduction of heat b) convection of heat c) radiation of heat d) all a, b & c

19. An insulator should have a) low thermal conductivity b) high thermal conductivity c) less resistance to heat flow d) a porous structure

20. Maximum heat transfer rate is obtained in a) laminar flow b) turbulent flow c) creeping flow d) transition region

21. The number of kg vaporised per kg of steam fed to the evaporator is defined as a) capacity b) rate of evaporation c) economy d) rate of vaporisation.

22. Multipass heat exchangers are used a) because of simplicity of fabrication b) for low heat load c) to obtain higher heat transfer coefficient and shorter tube d) to reduce pressure drop

23. In counter flow compared to parallel flow a) LMTD is greater b) Less surface is required for a given heat transfer rate c) Both a and b d) More surface is required for a given heat transfer rate

24. Water always boils when its a) temperature reches 100deg c b) Vapor pressure equals 76 cm of Hg c) Saturated vapor pressure equals the external pressure on its surface d) Saturated vapor pressure is less than the atmospheric pressure

25. Steam trap is used to a) condense the steam flowing in pipeline b) remove water resulting from partial condensation of steam c) stop the supply of steam d) none of these

26. In case of parallel flow heat exchanger the lowest temperature obtainable by hot fluid is …………. the outlet temperature of cold fluid a) equal to b) more than c) less than d) either more or less than ( depending on fluid )

27. Steam ejector is used to a) remove condensate from steam pipelines b) create vacuum c) superheat steam d) none of these

28. The rate of heat transfer is a product of overall heat transfer coefficient, the difference in temperature and the a) heating volume b) heat transfer area c) nusselt number d) none of these

29. In the cooling tower water becomes cool by

a) loosing sensible heat b) radiative heat transfer c) conduction d) none of the above

30. Which of the following is not a unit operation a) distillation b) absorption c) oxidation d) leaching

31. Flooding results in a) high tray efficiency b) low tray efficiency c) high gas velocity d) good contact between fluids

32. Which of the following is most effective in cooling tower operation a) natural draft b) forced draft c) induced draft d) atmospheric

33. Dry bulb temperature of the gas is a) less than wet bulb temperature b) more than the wet bulb temperature c) equal to the wet bulb temperature d) none of these

34. Raoult’s law is applicable to a) ideal solutions b) real solutions c) mixture of water and alcohol d) non ideal gases

35. What is the volumetric percentage of oxygen in air a) 30 b) 41 c) 21 d) 11

36. Which of the following provides maximum contact surface for a liquid-vapor system a) packed tower b) bubble cap plate column c) sieve plate column d) wetted wall column

37. The molecular weight of water is a) 08 b) 18 c) 28 d) 38

38. Channeling in a packed tower results from a) high pressure drop b) maldistribution of liquid c) non-uniformoity of packing d) both b and c

39. Under conditions of flooding in a distillation tower, the gas pressure drop a) decreases rapidly b) remains constant c) is maximum d) none of the above

40. Important factors affecting separation in a distillation tower is a) pressure b) temperature c) both a and b d) viscosity

41. The purpose of reflux in a distillation tower is a) to supply heat b) to increase purity c) to decrease purity d) none of the above

42. Which of the following is widely used as a fuel in refinery furnaces a) Gasoline b) Diesel c) Fuel oil d) Coal

43. Inter stage coolers in compressors a) increase the efficiency b) decrease the efficiency c) doesn’t affect efficiency d) none of the above

44. For fire to take place presence of the following is required a) Fuel & air b) Fuel & heat c) Air & heat d) Fuel, air & heat

45. The vapor pressure of an ideal liquid ……….. with increase in temperature a) increases b) decreases c) remains constant d) none of the above

46. Calculate the density,if Volume of liquid = 2cc Mass = 1gram 0.5 GM/CC ------------

47. The operating cost of a distillation column at minimum reflux ratio is a) minimum b) maximum c) optimum d) zero

47. Write TRUE / FALSE Energy can neither be created nor destroyed , but can be transferred from one form to another

48. In which of the following processes, temperature remains constant a) isothermal process b) adiabatic process c) polytropic process d) none of the above

49. Atmospheric pressure is a) 1 atmosphere b) 14.7 psi c) both a and b d) none of the above

50. Dry ice is a) moisture free ice b) solid helium c) solid carbon-di-oxide d) none of these

51. Reciprocating pumps are normally used for a) high pressure b) high flow c) high temperature d) none of the above

52. Write TRUE/FALSE Gear pump is a positive displacement type pump

53. Which of the following is widely used in process industries for the measurement of flow a) Orifice meter b) Bimetallic thermometer c) Bourdon gauge d) None of the above

54. What is the mass of water, if Number of moles = 10 Molecular weight = 18 kgs

180 KG

55. Which of the following has highest octane number a) petrol b) diesel c) fuel oil d) coke

56. Which of the following gases is inert a) hydrogen b) LPG c) Ethane d) Nitrogen

57. Methane is a a) paraffin b) olefin c) aromatic compound d) none of the above

58. Write TRUE/FALSE Crude oil contains some salts and water

59. Combustion reactions are a) exothermic b) endothermic c) both a and b d) none of the above

60. Sweetening of petroleum product mean removal of a) sulphur and its compounds b) water c) organic impurities d) wax

Please choose the best alternative :

1. Which of the following is attributed to Casing Design in case of Centrifugal pumps. I) Single-stage, II) Axial split, III) Horizontal, IV) Radial flow, 2. For HC,BFW and Effluent Handling Service,the type pump preferred is I) Plunger Pumps II) Gear Pumps III) Screw Pumps IV) Centrifugal Pumps 3. Which of the following is not the function of the Wear ring. I) Protecting the impeller from wear and tear II) Minimize the leakage between casing and impeller. III) Facilitate renewable leakage joints between casing and impeller IV) Intermate pumping of the fluid. 4. the approx. . range for specific speeds in case of radial –vane type impeller is I) 500-2000 II) 2001-6000 III) 7000-10000 IV) > 10000 5. Hardness difference for casing wear ring and mating impeller wear rings is preferably I) 60Rc II) 250BHN III) 50 BHN IV) 100BHN 6. When the pump is installed below the fluid source, the eccentric reducer provided in the suction is fitted. I) flat-side uppermost II) flat-side down III) flat-side in the sides IV) No flat side. 7. During commissioning, Suction filter screen mesh size should be of hole size diameter, I) 1.5mm II) 5mm III) 8mm IV) 10mm 8. At discharge valve closed condition, head deve3loped by the pump is I) Nil II) Minimum III) Maximum IV) Rated 9. Cause of Deficiency in flow rate by a centrifugal pump is because of I) partial impeller block II) Rubbing of impeller parts with the casing III) Foundation inadequate IV) Incorrect direction of rotation.
10. Pump suction piping diameter is normally kept ----------than the discharge piping. I) Of same size II) Bigger III) Smaller IV) Does not matter.

1. True or False. A pump can be referred to by more than one name.
2. List four basic components that are common to all pumps. a. _________________________ b. _________________________ c. _________________________ d. _________________________

3. What is the basic difference between positive displacement pumps and centrifugal pumps?

4. In comparison with positive displacement pumps, most centrifugal pumps move __________________( smaller,larger) volumes of liquids.
5. Electric motors and steam turbines are two common types of ___________________.
6. Before inspecting a pump, an operator should know, a. how the pump normally operates b. what special features the pump has c. What type of liquid is pumped d. The pump’s operating history e. All of the above.
7. True or False. Cavitation is the formation of gas pockets inside a pump that can occur during operation.
8. Reciprocating pumps and rotary pumps are the two basic types of _________________________Pumps.
9. Circle the correct answer. In most centrifugal pumps, the ______________________is a device that causes centrifugal force to be created in the pump. a. volute b. Impeller c. Piston d. Stage
10. Most multistage centrifugal pumps contain two or more a. Shafts b. Impeller c. Piston d. Both a and b.

11. List two names that can be given to a pump that supplies feedwater to a boiler. a. ______________________ b. _______________________

12. True or False. Packing is used to form a seal between a pump’s shaft and casing to eliminate leakoff.

13. A rattling noise that sounds like marbles ratting around inside a pump is usually a sign of _________________________.

14. If a pump’s available NPSH is ______________ the required NPSH, the pump could be damaged.(above, below).

15. Why are positive displacement pumps suitable for processes that require the injection and metering of specific amounts of liquids ?

16. True of False. A mechanical seal does not allow leakoff.

17. List three operating checks that should be performed on an operating pump. a. _________________________ b. _________________________ c. _________________________

18. The term “ head” can be used to refer to the ______________ exerted by a column of liquid as a result of its height.
19. In most centrifugal pumps, a ___________________ helps convert the speed of the liquid being pumped into pressure.
20. A pump can be called a(n) ________________ pump if it is ( inlet , discharge ) located at the point where a particular liquid enters a process.

21. The _________________ in a centrifugal pump has a series of curved vanes that extend out form its centre.

22. True or False. In the volute of a centrifugal pump, liquid velocity is converted into pressure.

1. The _________________ in a centrifugal pump has a series of curved vanes that extend out form its centre.

2. True or False. In the volute of a centrifugal pump, liquid velocity is converted into pressure.

3. Many centrifugal pumps have a ________________ valve in the discharge line to prevent liquid flow back through the pump. a. Inlet b. Control c. Check d. Seal water

4. (a) ________________and (b) _______________ have the same basic function to help keep the process liquid inside a pump by sealing the spaces where the shaft penetrates the casing.

5. List the three types of impellers that are used in centrifugal pumps. a. _____________________ b. ______________________ c. ______________________

6. List the three types of impeller that are used in centrifugal pumps. a. __________________________ b. __________________________ c. __________________________

7. True or False. On some impellers, the vanes are enclosed by shrouds to increase the efficiency of the pumping action.

8. A centrifugal pump with a ____________________ mounted shaft is commonly used to keep its driver above a level of liquid being pumped.

9. A(n) ____________________ flow design involves an impeller ( radial, axial, mixed ) that directs liquid at a 90-degree angle form the suction eye.

10. True or False. Axial thrust is created by the difference in pressure across an impeller.

11. True or False. A diffuser performs basically the same function as a volute.

12. List two common methods of minimizing axial thrust that are used in multistage centrifugal pumps. a. __________________________ b. __________________________