chapter 12

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  1. Reciprocating pumps:
    1. Are high-pressure pumps
    2. Are always single acting
    3. Use mechanical seals
    4. Should be started with the suction and discharge valve open
    a. 1, 2, 3, 4
    b. 1, 2, 3
    c. 1, 2, 4
    d. 2, 4
    e. 1, 4
    1,4
  2. The amount of liquid pumped by a reciprocating pump is determined by:
    1. The area of the piston, plunger or diaphragm
    2. The length of the stroke
    3. The discharge pressure
    4. The number of pumping strokes per minute
    a. 1, 2
    b. 3, 4
    c. 1, 2, 4
    d. 1, 2, 3, 4
    e. 1, 2, 3
    1,2,4
  3. The following are examples of rotary pumps:
    1. Sliding vane
    2. Double acting
    3. Internal gear pump
    4. Two screw
    a. 1, 2, 3
    b. 1, 3, 4
    c. 2, 3, 4
    d. 1, 2, 4
    e. 1, 2, 3, 4
    1,3,4
  4. The name “rotary pump” is given to those pumps, which consist of a closed casing in which gears; lobes, vanes or screws rotate with a _______ of clearance.
    a. minimum
    b. maximum
    c. standard
    d. large
    minimum
  5. The external gear pump:
    a. has two gears, which rotate in opposite directions inside the casing.
    b. has an externally-cut gear which meshes with an internally-cut gear on one side and is separated from this gear on the other side by a crescent-shaped partition which prevents liquid from passing back from discharge to suction side.
    c. has a rotor containing vanes within slots.
    d. has two rotors each with three lobes.
    e. has two rotors each with two opposing spirals or screw threads.
    has two gears, which rotate in opposite directions inside the casing
  6. The internal gear pump:
    a. has two gears, which rotate in opposite directions inside the casing.
    b. has an externally-cut gear which meshes with an internally-cut gear on one side and is separated from this gear on the other side by a crescent-shaped partition which prevents liquid from passing back from discharge to suction side.
    c. has a rotor containing vanes within slots.
    d. has two rotors each with three lobes.
    e. has two rotors each with two opposing spirals or screw threads.
    has an externally-cut gear which meshes with an internally-cut gear on one side and is separated from this gear on the other side by a crescent-shaped partition which prevents liquid from passing back from discharge to suction side
  7. The sliding-vane pump:
    a. has two gears, which rotate in opposite directions inside the casing.
    b. has an externally-cut gear which meshes with an internally-cut gear on one side and is separated from this gear on the other side by a crescent-shaped partition which prevents liquid from passing back from discharge to suction side.
    c. has a rotor containing vanes within slots.
    d. has two rotors each with three lobes.
    e. has two rotors each with two opposing spirals or screw threads.
    has a rotor containing vanes within slots
  8. The three-lobe pump:
    a. has two gears, which rotate in opposite directions inside the casing.
    b. has an externally-cut gear which meshes with an internally-cut gear on one side and is separated from this gear on the other side by a crescent-shaped partition which prevents liquid from passing back from discharge to suction side.
    c. has a rotor containing vanes within slots.
    d. has two rotors each with three lobes.
    e. has two rotors each with two opposing spirals or screw threads.
    has two rotors each with three lobes
  9. The two-screw pump:
    a. has two gears, which rotate in opposite directions inside the casing.
    b. has an externally-cut gear which meshes with an internally-cut gear on one side and is separated from this gear on the other side by a crescent-shaped partition which prevents liquid from passing back from discharge to suction side.
    c. has a rotor containing vanes within slots.
    d. has two rotors each with three lobes.
    e. has two rotors each with two opposing spirals or screw threads.
    has two rotors each with two opposing spirals or screw threads
  10. A centrifugal pump may be defined as a pump, which uses _________ force to impart energy to a fluid by giving the fluid high velocity and then converting this velocity into pressure.
    a. work
    b. centrifugal
    c. pressure
    d. suction
    centrifugal
  11. The term “volute” refers to the gradually increasing cross-sectional area of the spiral impeller.
    a. True
    b. False
    False
  12. As the liquid travels through the volute casing to the discharge, its ______ energy is converted into pressure or potential energy.
    a. rotation
    b. fluids
    c. kinetic
    d. electrical
    kinetic
  13. A centrifugal pump lifts water by:
    a. Running the pump fast
    b. Creating a vacuum and atmospheric pressure forcing water into the pump - it creates a low pressure at the inlet and liquid is drawn
    into the centre (called the 'eye') of the impeller
    c. Means of a primer to increase the valve travel
    d. Hydro-pneumatic methods
    e. giving the fluid high velocity
    Creating a vacuum and atmospheric pressure forcing water into the pump
  14. To pump a heavy viscous liquid you would use:
    1. A centrifugal pump
    2. A rotary pump
    3. A reciprocating pump
    4. A sliding vane pump
    a. 1, 2, 3, 4
    b. 1, 2, 3
    c. 2, 3, 4
    d. 1, 3, 4
    e. 1, 2, 4
    2,3,4
  15. To transfer large amounts of liquid you would use:
    a. A centrifugal pump
    b. A rotary pump
    c. A reciprocating pump
    d. A sliding vane pump
    e. an external gear pump
    A centrifugal pump
  16. The following are types of centrifugal pumps:
    1. Volute
    2. Axial flow
    3. Regenerative
    4. Triplex
    a. 1, 2, 3
    b. 2, 3, 4
    c. 1, 2, 3, 4
    d. 1, 3, 4
    e. 1, 2, 4
    1,2,3
  17. The vertical pump assembly often is ________ in the fluid being pumped.
    a. suspended
    b. immersed
    c. above
    d. floating
    immersed
  18. The single suction pump has an imbalance of thrust, this is taken care of by mechanical means, such as a ________ ________.
    a. balance disc
    b. double seal
    c. thrust bearing
    d. double bearings
    thrust bearing
  19. Multi-stage pumps are equipped with two or more impellers operating in ______.
    a. parallel
    b. series
    c. opposition
    d. together
    series
  20. Multi-stage pumps of the volute or diffuser type with discharge pressures above 10 000 kPa ______ casings are used.
    a. split
    b. volute
    c. barrel
    d. high-pressure
    barrel
  21. The axial flow pump, often called a __________ pump, uses an impeller with vanes similar to a ship's propeller.
    a. ships
    b. mates
    c. lift
    d. propeller
    propeller
  22. As compared to a radial flow pump, the axial pump has a low suction lift and develops a relatively low discharge head, but it has a ______ flow capacity.
    a. small
    b. large
    c. minimum
    d. select
    large
  23. The mixed flow pump has a single inlet impeller with the flow entering the pump in an axial direction and leaving the pump in a direction between axial and __________.
    a. centrifugal
    b. radial
    c. series
    d. parallel
    radial
  24. A stuffing box:
    1. Stops air leaking into the casing when the pressure is below atmospheric pressure
    2. Prevents leakage out of the casing when the pressure is above atmospheric pressure
    3. Is always supplied with a lantern ring
    4. Is filled with packing
    a. 1, 2, 3, 4
    b. 1, 2, 3
    c. 1, 2, 4
    d. 2, 3, 4
    e. 1, 3, 4
    1,2,4
  25. Mechanical seals:
    1. Are used where leakage is objectionable
    2. Replace stuffing boxes
    3. Are used for volatile liquids
    4. Are less costly than stuffing boxes
    a. 1, 2, 3, 4
    b. 1, 2, 3
    c. 2, 3, 4
    d. 1, 3, 4
    e. 1, 2, 4
    1,2,3
  26. Shaft sleeves:
    1. Will prevent air from entering the pump
    2. Reduce the maintenance cost on pumps
    3. Protect the shaft from scoring and corrosion
    4. Are used with all mechanical seals
    a. 1, 2, 3, 4
    b. 1, 2
    c. 2, 3
    d. 2, 4
    e. 1, 4
    2,3
  27. Wearing rings:
    1. Are used on impellers
    2. Are used in the casing
    3. Give protection to the shaft
    4. Reduce the maintenance cost of the pump
    a. 1, 2, 3, 4
    b. 1, 2, 3
    c. 1, 2, 4
    d. 2, 3, 4
    e. 1, 3, 4
    1,2,4
  28. When a wearing ring is mounted only on the impeller, it is made of a ______ material than that of the casing so that practically all wear is on the ring.
    a. harder
    b. softer
    c. stiffer
    d. different
    softer
  29. Wearing rings are often made of _______ or cast iron since these materials tend to wear in a smooth manner.
    a. bronze
    b. copper
    c. nickel
    d. brass
    bronze
  30. Axial thrust:
    1. Is caused by hydraulic force
    2. Is found in reciprocating pumps
    3. Is found in centrifugal pumps
    4. Tends to move the impeller out of its proper position
    a. 1, 2, 3, 4
    b. 2, 3, 4
    c. 1, 3, 4
    d. 1, 2, 3
    e. 1, 2, 4
    1,3,4
  31. Axial thrust:
    A) Tends to move the shaft in the direction of discharge
    B) Has no effect on the shaft
    C) Tends to move the shaft in the direction of suction
    D) Is not a serious problem and, therefore, requires no action to remedy the situation
    E) act radially on the casing
    Tends to move the shaft in the direction of discharge
  32. When using a double inlet impeller pump:
    1. The forces on the impeller are theoretically balanced
    2. The flow to each eye is not always equal
    3. The speed of the pump must be higher than the single inlet type
    4. A light thrust bearing is still required
    a. 1, 2, 3, 4
    b. 1, 2, 3
    c. 2, 3, 4
    d. 1, 3, 4
    e. 1, 2, 4
    1,2,4
  33. When using opposing single inlet impeller type pumps:
    1. The axial thrust can be eliminated by the use of opposed impellers
    2. The impellers must all face in one direction
    3. No wearing rings are used
    4. The inlet of one half of the impeller face in one direction and the other half in the opposite direction
    a. 1, 2, 3, 4
    b. 1, 4
    c. 2, 3, 4
    d. 3, 4,
    e. 1, 2, 4
    1,4
  34. A balancing drum:
    1. Is installed on the shaft between the first impeller and the suction of the pump
    2. Has a balancing chamber, which is connected to the suction of the pump
    3. Rotates inside the stationary member of the balancing device
    4. Is installed on the shaft between the last impeller and the balancing chamber
    a. 1, 2, 3
    b. 2, 3, 4
    c. 1, 3, 4
    d. 1, 2, 4
    e. 1, 2, 3, 4
    2,3,4
  35. The purposes of the restricting orifice when used with the balancing disc is to:
    a. Restrict the speed of the pump
    b. Normally keep the pressure in the balancing chamber well above the suction pressure
    c. Normally keep the pressure in the balancing chamber well below the suction pressure
    d. Help run the pump at a faster speed
    e. prevents any leakage from the high pressure side of the pump into the balancing chamber
    Normally keep the pressure in the balancing chamber well above the suction pressure
  36. Balancing drum and disc combination:
    1. Has some disadvantages
    2. Is seldom used on multi-stage pumps
    3. Is used on most multi-stage pumps
    4. Has all the advantages of both hydraulic devices without any of their disadvantages
    a. 1, 2
    b. 2, 3
    c. 3, 4
    d. 2, 4
    e. 1, 3
    3,4
  37. It is imperative that the flow through a multistage pump be kept above a ________ flow rate.
    a. maximum
    b. manufactures
    c. minimum
    d. safe
    minimum
  38. The standard method to meet ________ flow is to have a separate recirculation control valve, which allows for liquid to flow back to the pump suction drum.
    a. maximum
    b. manufactures
    c. minimum
    d. safe
    minimum
  39. An ______ valve is a combination check valve and minimum flow valve in one unit.
    a. discharge
    b. ARC
    c. recirc
    d. check
    ARC
  40. The priming of a pump means:
    a. Getting the pump ready to pump hot water
    b. Filling the pump with liquid and venting off air
    c. Starting the pump with the discharge valve closed and the suction valve open
    d. Starting the pump with the suction valve closed and the discharge valve open
    e. regulating the length of the stroke
    Filling the pump with liquid and venting off air
  41. Which of the following pumps are self-priming?
    1. Centrifugal pump
    2. Positive displacement pump
    3. Reciprocating pump
    4. Rotary pump
    a. 1, 2, 3, 4
    b. 1, 2, 3
    c. 2, 3, 4
    d. 1, 2, 4
    e. 1, 3, 4
    2,3,4
  42. The capacity of a reciprocating pump and rotary pump is adjusted by:
    a. Regulating the discharge pressure
    b. Regulating the suction valve to the pump
    c. Regulating the speed
    d. Regulating the discharge valve opening
    e. regulating the length of the stroke
    Regulating the speed
  43. The capacity of a centrifugal pump:
    1. Can be controlled by the suction valve opening
    2. Increases when the discharge head increases
    3. Increases when the discharge head decreases
    4. Can be controlled by speed regulation
    a. 1, 2, 3
    b. 1, 2
    c. 2, 3
    d. 3, 4
    e. 1, 4
    3,4
  44. Running a centrifugal pump with the suction valve throttled could:
    1. Cause the pump to speed up
    2. Starve the impeller of liquid supply
    3. Result in excessive vibrations, which may ruin the bearings
    4. Damage the mechanical seals and stuffing boxes
    a. 1, 2, 3, 4
    b. 1, 2, 3
    c. 2, 3, 4
    d. 1, 3, 4
    e. 1, 2, 4
    2,3,4

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Author:
PowerPrep
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317532
Filename:
chapter 12
Updated:
2016-03-18 20:25:00
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chapter 12
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