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3B1 chapter 12
pump designs and operations
| Question | Answer |
|---|---|
| pumps can be divided into three main classes. a. Direct acting, power driven, plunger type b. Single acting, double acting, triplex c. Centrifugal, rotary, reciprocating d. Three lobe, two screw, internal gear e. centrifugal, centripedal, impulse | c. Centrifugal, rotary, reciprocating |
| 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 | e. 1, 4 |
| A direct acting, reciprocating pump means that: a. The pump has a crank shaft driven by a separate power source b. The piston rods of steam and of water pistons are directly connected together d. The pump is operated by an electric motor coupled direct | b. The piston rods of steam and of water pistons are directly connected together |
| The amount of liquid pumped by a reciprocating pump is : 1. The area of the piston, plunger or diaphragm 2. The length of the stroke 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 | c. 1, 2, 4 |
| Relief valves are used on: 1. Power driven, reciprocating pumps 2. The suction side of a reciprocating pump 3. Reciprocating pumps to prevent over pressuring 4. Direct-acting steam driven pumps a. 1, 2 b. 2, 3 c. 3, 4 d. 1, 3 e. 1, 4 | d. 1, 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 | b. 1, 3, 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 | a. minimum |
| The external gear pump: a. has two gears, which rotate in opposite directions inside the casing. d. has two rotors each with three lobes. e. has two rotors each with two opposing spirals or screw threads | a. has two gears, which rotate in opposite directions inside the casing. |
| 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 part | . 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. |
| The sliding-vane pump: 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 | c. has a rotor containing vanes within slots |
| The three-lobe pump: 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 | d. has two rotors each with three lobes. |
| The two-screw pump: 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 | e. has two rotors each with two opposing spirals or screw threads |
| A centrifugal pump lifts water by: a. Running the pump fast b. Creating a vacuum and atmospheric pressure forcing water into the pump c. Means of a primer to increase the valve travel d. Hydro-pneumatic methods e. giving the fluid high velocity | b. Creating a vacuum and atmospheric pressure forcing water into the pump |
| 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. A rotary pump 3. A reciprocating pump 4. A sliding vane pump |
| 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. A centrifugal pump |
| A multistage pump would be used: a. When the lift is high b. When a greater volume must be pumped c. When the head is high d. When the temperature of the water being pumped is high e. when pumping a liquid containing an abrasive | c. When the head is high |
| 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. Volute 2. Axial flow 3. Regenerative |
| The vertical pump assembly often is ________ in the fluid being pumped. a. suspended b. immersed c. above d. floating | b. immersed |
| 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 | c. thrust bearing |
| Multi-stage pumps are equipped with two or more impellers operating in ______. a. parallel b. series c. opposition d. together | b. series |
| 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 | c. barrel |
| 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 | d. propeller |
| 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 | b. large |
| 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 | b. radial |
| 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 4. Is filled with packing | 1, 2, 4 |
| 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. Are used where leakage is objectionable 2. Replace stuffing boxes 3. Are used for volatile liquids |
| 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. Reduce the maintenance cost on pumps 3. Protect the shaft from scoring and corrosion |
| 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 | c. 1, 2, 4 |
| 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 | b. softer |
| 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 |
| 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 | c. 1, 3, 4 |
| 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 | C) Tends to move the shaft in the direction of suction |
| Thrust bearings: 1. Are located on the pump shaft 2. Are located on low capacity pumps 3. Are located on single stage pumps only 4. Prevents axial movement A) 1, 2, 3, 4 B) 1, 2, 3 C) 1, 2, 4 D) 1, 3, 4 E) 2, 3, 4 | D) 1, 3, 4 |
| 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 re | 1, 2, 4 |
| 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 | 1, 4 |
| A balancing drum: 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 | 2, 3, 4 |
| A balancing disc: 1. Consists of a disc mounted on the rotating shaft at the suction end of pump 2. Has a restricting orifice located in the balancing chamber 3. Has no disadvantages 4. Consists of a disc mounted on the rotating shaft at the dischar | 2. Has a restricting orifice located in the balancing chamber, 4. Consists of a disc mounted on the rotating shaft at the discharge of pump |
| 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 c | b. Normally keep the pressure in the balancing chamber well above the suction pressure |
| 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, 4 |
| It is imperative that the flow through a multistage pump be kept above a ________ flow rate. a. maximum b. manufactures c. minimum d. safe | c. minimum |
| 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 | c. minimum |
| An ______ valve is a combination check valve and minimum flow valve in one unit. a. discharge b. ARC c. recirc d. check | ARC |
| 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 c | b. Filling the pump with liquid and venting off air |
| 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. Positive displacement pump 3. Reciprocating pump 4. Rotary pump |
| 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 st | c. Regulating the speed |
| 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 | 3. Increases when the discharge head decreases 4. Can be controlled by speed regulation |
| 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 b | 2, 3, 4 |
| Starting an electric driven centrifugal pump with the discharge closed: a. Helps to prime the pump b. Helps to prevent excessive vibrations c. Helps to protect the electric motor d. Helps keep air from entering the pump e. helps reduce the flow resi | c. Helps to protect the electric motor |
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