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Unit 1 Lubrication and bearings - ans Large journal or sleeve bearings have grooves: Select one: a. In the non-pressure area b. For distributing lubricant evenly just after the pressure area c. Cut into the bearing housing d. In the high pressure area of the bearing babbit - ansIn the non-pressure area A normal anti-friction bearing temperature operating range is: Select one: a. 80°C to 120°C b. 20°C to 50°C c. 65°C to 70°C d. 150°C to 160°C - ans65°C to 70°C A collar thrust bearing: Select one: a. Has boundary lubrication b. Is used with steam turbines only c. Is an anti-friction type bearing d. Can support more load than a Michell thrust bearing - ansa. Has boundary lubrication A material that is commonly used as a solid lubricant is: Select one: a. Tallow b. Lime c. Molybdenum disulfide d. Sodium carbonate - ansc. Molybdenum disulfide Lubricants used for high-output steam turbines should: Select one: a. Mix well with water b. Have a low pour point c. Be fire resistant d. Have a very high viscosity - ansc. Be fire resistant All semi-solid lubricants: Select one: a. Have a low viscosity b. Are capable of sealing out dirt and water from bearings c. Contain graphite d. Resist moisture - ansb. Are capable of sealing out dirt and water from bearings Which of the following has the greatest effect on the viscosity of lubrication oil? Select one: a. Pressure b. Load c. Temperature d. Speed - ansc. Temperature Applying installation forces through the balls of a bearing can cause:
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Select one: a. Brinelling b. Cracking or breaking of the balls c. too large an air gap d. Bearing misalignment - ansa. Brinelling If an oil must flow at a very low temperature[comma] it must have the following additive: Select one: a. Viscosity index improver b. Pour point depressant c. Dispersant d. Floc point improver - ansb. Pour point depressant The oil for a refrigeration compressor must: Select one: a. Be a multi-grade type b. Have a high fire point c. Have a high flash point d. Have a low pour point - ansd. Have a low pour point The characteristics of a grease are determined by: Select one: a. Its thickening agent or €œsoap€ b. Its consistency c. The type of oil used in the grease d. Its protective coating - ansa. Its thickening agent or €œsoap€ If ambient air temperatures are very low[comma] the preferred lubricant is a: Select one: a. Solid b. Semi-solid c. Fixed oil d. Liquid - ansa. Solid A common cause of antifriction bearing failure is: Select one: a. Shaft misalignment b. Drive motor overload c. Extreme cold temperature cracking d. High RPM service - ansa. Shaft misalignment The cheapest and most commonly used grease is: Select one: a. Sulphate base b. Lime base c. Chlorine base d. Potassium base - ansb. Lime base A form of lubrication that requires continual motion of a shaft or surface is: Select one: a. Fluid film lubrication
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c. Has rolling friction d. Wears to a smooth, low-friction surface e. Is constructed with white metal alloy - ansc. Has rolling friction The point at which oil will give off enough vapour to ignite and burn continuously is known as the _____ point. Select one: a. Flash b. Ignition c. Fire d. Vaporization - ansc. Fire The lubricant for an anti-friction bearing: Select one: a. Should have a high viscosity b. Could be a semi-solid lubricant c. Must be cooled d. Will separate the moving parts completely - ansb. Could be a semi-solid lubricant Fluid film lubrication: Select one: a. Prevents wear during start-up b. Supports heavy loads c. Is different from flood lubrication d. eliminates all bearing friction - ansb. Supports heavy loads With antifriction bearings using grease, the bearings: Select one: a. Never require cleaning b. Are cleaned less often than oil-lubricated bearings c. can be cleaned by adding solvent to the grease cartridge d. Must be cleaned twice as often as oil-lubricated bearings - ansb. Are cleaned less often than oil-lubricated bearings A shell type bearing: Select one: a. Is used for heavy loads b. Consists of ball bearings in a shell c. Is an anti-friction bearing d. Is used for axial thrust - ansa. Is used for heavy loads The proper way to store a bearing after cleaning is to dip it in __________________ and wrap it in grease-proof paper. Select one: a. A rust preventative b. Solvent c. Wax d. a desiccant such as rice - ansa. A rust preventative If an oil€™s viscosity changes a lot with very little temperature change[comma] it will have a:
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Select one: a. Low pour point b. High pour point c. High viscosity index d. Low viscosity index - ansd. Low viscosity index The majority of lubricants are: Select one: a. Animal fats b. Synthetic oils c. Mineral oils d. Greases - ansc. Mineral oils Air compressor oil should: Select one: a. Have a very low viscosity b. Have low carbon residue c. Have a low flash point d. Not contain anti-oxidants - ansb. Have low carbon residue A large journal bearing which is running hotter than normal can be cooled by: Select one: a. pumping additional grease into it b. Decreasing the viscosity of the oil by cooling it c. Loosening the bearing caps d. Direct application of cool water - ansc. Loosening the bearing caps The resistance of a liquid to internal deformation or shear is known as: Select one: a. Pour point b. Viscosity index c. Flash point d. Viscosity - ansd. Viscosity A journal bearing: Select one: a. Supports a shaft b. require cooling water c. Does not require lubrication d. Controls thrust movement - ansa. Supports a shaft When grease is used in an antifriction bearing after cleaning, the bearing housing should not be filled _____ full. Select one: a. less than completely b. more than 1/ c. more than 3/ d. more than 1/3 - ansd. more than 1/ Where gear teeth inter-mesh[comma] a lubricant must provide Select one:
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a. Withstand shaft misalignment and vibration better than packing b. Are used where leakage is must be reduced to a minimum c. Replace seal cages d. Allow the pump to be run dry - ansb. Are used where leakage is must be reduced to a minimum An air compressor may be automatically started and stopped by a pressure switch, which is usually found connected to the: Select one: a. Control panel b. Receiver c. Aftercooler d. Intercooler - ansb. Receiver Rotary pumps: Select one: a. Are positive displacement pumps b. Must use mechanical seals c. Must be primed before each use d. Are low-pressure pumps - ansa. Are positive displacement pumps When a reciprocating pump delivers fluid every second stroke of its piston, it is called a ___________ pump: Select one: a. Double acting b. Two-stage c. Single acting d. Positive displacement - ansc. Single acting If an electric motor's rotational speed is too high for a given compressor, what may be done? Select one: a. use a speed limiter b. use compressor unloading c. use a variable speed drive d. use reduction gears - ansd. use reduction gears A diffuser pump: Select one: a. is more effective at changing velocity to pressure than a volute pump b. Has high suction lift c. Does not have a volute d. Does not have to be primed - ansa. is more effective at changing velocity to pressure than a volute pump Most pump troubles occur: Select one: a. Because of inadequate operator training b. During initial start up c. Due to vapour binding d. After about six months of continuous service - ansb. During initial start up
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To reduce air temperature between stages, ____________ are used. Select one: a. air dryers b. receivers c. aftercoolers d. intercoolers - ansd. intercoolers Pump wear rings are installed on an impeller bythreading, or: Select one: a. Shrinking b. Welding c. Brazing d. Forging - ansa. Shrinking It is generally accurate to say that: Select one: a. 1 kPa will result from a water head of 9.8 m b. 10.21 kPa will result from 1 metre of static water head c. A water height or depth of 10.34 metre results in 1 kPa d. 9.8 kPa pressure results from every metre of water depth or height - ansd. 9.8 kPa pressure results from every metre of water depth or height Centrifugal pump power requirements are decreased when: Select one: a. The discharge velocity is high b. The casing pressure drops c. The mass of fluid delivered is decreased d. Discharge pressure is decreased - ansc. The mass of fluid delivered is decreased What size of packing would you use to repack a pump gland having a stuffing box bore of 8. cm and a pump shaft diameter of 6.7 cm? Select one: a. 0.5 cm b. 1.9 cm c. 0.675 cm d. 0.95 cm - ansd. 0.95 cm Single stage reciprocating air compressors have: Select one: a. Low power requirements b. Several cylinders, each of different sizes c. Variable speed drivers d. One or more cylinders of equal size - ansd. One or more cylinders of equal size Intercoolers should be equipped with: Select one: a. Automatic blow downs b. Baffles c. Safety valves d. Moisture separators - ansc. Safety valves
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a. The pump has a stuffing box and lantern ring b. A mechanical seal is used c. The medium being pumped contains suspended solids d. The medium being pumped is high temperature - ansb. A mechanical seal is used Strainers may be found: Select one: a. Inside the pump b. On the air vent discharge of the pump c. On the suction side of a centrifugal pump d. On the discharge side of the pump - ansc. On the suction side of a centrifugal pump In order to protect the drive motor, a start-stop air compressor should be equipped with: Select one: a. Safety heads b. A speed-sensitive automatic cylinder unloader c. Variable speed control d. Constant speed control - ansb. A speed-sensitive automatic cylinder unloader Centrifugal pumps do not develop good suction lift because: Select one: a. They favour pressure rather than volume b. The speed is too low c. Their internal component clearances are too high d. Atmospheric pressure is usually too low - ansc. Their internal component clearances are too high An air compressor auxiliary which will decrease the power requirement is the: Select one: a. Aftercooler b. Intercooler c. Receiver d. Diffuser - ansb. Intercooler Rotary pumps should be started with the discharge valve open because they are _____ pumps. Select one: a. Regenerative b. Positive displacement c. Double-acting d. Reciprocating - ansb. Positive displacement Positive displacement compressors: Select one: a. Could be single stage with three cylinders b. Must all use internal lubrication c. Must have suction and discharge valves d. Cannot deliver pulsation-free air - ansa. Could be single stage with three cylinders A speed-increasing gear is commonly used on: Select one:
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a. Lobe compressors b. Sliding vane compressors c. Screw compressors d. Rotary lobe compressors - ansc. Screw compressors A circulating pump, known as a cooling water pump,is usually: Select one: a. A small capacity pump b. A once-through device c. A reciprocating pump d. Connected with some type of heat exchanger system - ansd. Connected with some type of heat exchanger system A slight leakage is desired between the pump shaft and the packing in order to: Select one: a. Prevent the ingress of air b. Prevent wearing of the wear rings c. Lubricate the packing d. Prevent the pump from vapour locking - ansc. Lubricate the packing In a centrifugal compressor the kinetic energy is converted to potential energy in the: Select one: a. Volute only b. Compressor cavity c. Diffuser only d. Volute, diffuser or both - ansd. Volute, diffuser or both Sliding vane compressors: Select one: a. Are positive displacement compressors b. Use cylinder unloading c. Are dynamic compressors d. Use suction and discharge valves - ansa. Are positive displacement compressors A inspection of a pump that is in operation should include: Select one: a. Re-priming the pump. b. Checking that the suction and discharge pressures are correct c. Ensuring waterflowsfreely from the packing d. Ensuring water drips from the mechanical seals - ansb. Checking that the suction and discharge pressures are correct Compressor unloaders work in three different ways. One of these is: Select one: a. Activating the variable speed drive b. Activating the stop and start button c. Keeping the suction valve open d. Closing the discharge valve - ansc. Keeping the suction valve open Before starting a centrifugal pump: Select one:
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A low water fuel cutoff on an unattended steam boiler shall be installed so that Select one: a. It shuts down the burner when the water level falls below the lowest visible part of the gauge glass. b. It can be isolated if it is not required c. It starts the feed water pump d. It cannot be rendered inoperative - ansd. It cannot be rendered inoperative How many blow-off valves are required by most power boilers? Select one: a. Two b. Three c. One d. Zero - ansa. Two A float operated low water fuel cutoff has its switch separated from boiler pressure by: Select one: a. Packing b. A seal cage c. A bellows d. A float cage - ansc. A bellows The test lever on a safety valve must not be used unless the boiler: Select one: a. Is at the popping pressure of the safety valve b. Pressure is at least 75% of the valve popping pressure c. Has no load on it d. Is at maximum operating pressure - ansb. Pressure is at least 75% of the valve popping pressure The popping pressure of a safety valve ________________ without replacing its spring: Select one: a. Can be changed by plus or minus 5% b. Can only be decreased by 5% c. Can only be increased by 5% d. Cannot be changed - ansa. Can be changed by plus or minus 5% A hot water boiler operating control (Aquastat) may be a pressure switch: Select one: a. that is normally open b. that responds to the expansion and contraction of boiler water c. operated by a filled system thermometer d. that is sensitive to steam pressure - ansc. operated by a filled system thermometer The main controlling device used with an On/Off combustion fuel control is a _____ sensing element. Select one: a. Pressure b. Level c. Flow
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d. Electronic - ansa. Pressure According to ASME IV, the scale of a pressure gauge for a steam boiler shall be graduated to not less than Select one: a. 125 to 325 kPa b. 100 to 300 kPa c. 200 to 414 kPa d. 2500 to 3000 kPa - ansc. 200 to 414 kPa When boilers cycle on and off frequently Select one: a. their efficiency drops. b. they should be kept on manual high fire to prevent excessive cycling. c. automatic firing rate controls should be used. d. they do not require post-purges. - ansa. their efficiency drops. The purpose of the pipe siphon installed between the boiler and the pressure gauge is to prevent: Select one: a. Air from entering the boiler b. Hot steam from entering the gauge c. Water from entering the gauge d. Air from entering the gauge - ansb. Hot steam from entering the gauge A variable resistance modulating control: Select one: a. Works in conjunction with a modulating motor b. Utilizes a mercury switch c. Senses steam temperature d. Operates only in the vertical position - ansa. Works in conjunction with a modulating motor Temperature relief devices can open on a rise in temperature by the expansion of a wax-filled rod or by the: Select one: a. Action of a bellows b. Action of a bi-metal strip c. Melting of a fusible link d. Melting of the alloy in a fusible plug - ansd. Melting of the alloy in a fusible plug A feedwater pipe, where connected to a power boiler, must have: Select one: a. A quick and slow opening stop valve b. A stop valve only c. A check valve between the stop valve and the boiler d. A check valve, with a stop valve between the check valve and the boiler - ansd. A check valve, with a stop valve between the check valve and the boiler When the energy output and the energy demand are equal, the water temperature of a hot water boiler
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a. They are more compact b. They can withstand higher pressures than tubular gauge glasses c. A light can be installed behind them d. It is easier to see the level - ansb. They can withstand higher pressures than tubular gauge glasses In hot water boiler firing rate control systems, the measured variable is Select one: a. the combustion air pressure b. the outlet water pressure c. the inlet water temperature d. the outlet water temperature - ansd. the outlet water temperature What is the minimum number of safety valves required on a boiler that has a heating surface of 42 m2? Select one: a. Three b. Two c. One d. None - ansc. One When the energy output and the energy demand are equal, the boiler pressure Select one: a. rises b. remains constant c. falls d. becomes unstable - ansb. remains constant The purpose of the tee fitting on the piping leading to a boiler steam pressure gauge is to: Select one: a. Attach a test gauge b. Blowoff condensate from the pigtail c. Test a sample of steam for purity d. Bypass the siphon tube - ansa. Attach a test gauge The programmer will go through a post purge: Select one: a. On any type of shutdown except power outage b. By manually advancing the timer c. Only on flame failure d. Only if pilot fails to ignite - ansa. On any type of shutdown except power outage Every steam boiler must have a safety valve that is: Select one: a. Connected to the steam or water space of the boiler, without any intervening fitting. b. Fitted in a vertical position, directly connected to the top of the boiler. c. Fitted securely to a shut-off valve, which is directly connected to the top of the boiler. d. Placed in the piping system leading from the steam stop valve. - ansb. Fitted in a vertical position, directly connected to the top of the boiler. A low fire start switch:
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Select one: a. Is closed when the damper is at high fire. b. Acts as a pre-ignition interlock to ensure minimum damper setting during ignition c. Ensures the purge takes place with the damper in the low-fire position d. Is a type of manual over ride - ansb. Acts as a pre-ignition interlock to ensure minimum damper setting during ignition The prime importance of boiler fittings is: Select one: a. Convenience b. Safety & efficiency c. To satisfy regulations d. Economics - ansb. Safety & efficiency An automatic boiler on-off firing rate control has one adjustment for pressure set-point and another for: Select one: a. High steam pressure limit set point adjustment. b. Water level adjustment c. Manual or automatic control d. Differential adjustment - ansd. Differential adjustment At the end of the pre-purge period, the programming control: Select one: a. Energizes the ignition transformer b. Ends the ignition trial c. Opens the main fuel valve d. Closes the pilot valve - ansa. Energizes the ignition transformer If a boiler's safety valves have insufficient relief capacity, the boiler pressure may: Select one: a. Rise more than 6% above the MAWP. b. Force water from the boiler, causing a low water condition. c. Remain at the MAWP d. Not rise more than 15% above the MAWP - ansa. Rise more than 6% above the MAWP. The set pressure of a safety valve may only be adjusted by: Select one: a. an industrial insurance adjuster b. the safety valve manufacturer, its authorized representative, or an assembler c. authorized and certified personnel d. a power engineer - ansb. the safety valve manufacturer, its authorized representative, or an assembler Primary controls, as used in a burner management system: Select one: a. Are unreliable and unsafe. b. must shut off the fuel within four seconds of flame failure. c. Generate a voltage, which is then used to monitor flames.
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a. mechanical cleaning, fireside b. refractory curing, waterside c. certificate, complete d. boil-out, refractory - ansd. boil-out, refractory While warming up and cutting-in a hot water heating boiler with a hot system, which of the following is true? Select one: a. Make sure the burner shuts off before the safety valve opens. b. Close the valves connecting the expansion tank to the on-line boilers, and open the valve that connects the cold boiler to the expansion tank. c. While warming up, the boiler must be on €œhigh fire€ or €œautomatic.€ d. Keep the stop valves in the supply and return lines to the boiler closed during warm-up. - ansd. Keep the stop valves in the supply and return lines to the boiler closed during warm-up. "SOP" stands for Select one: a. Special Operating Procedure b. SimplifiedOperating Practices c. SimplifiedOperating Procedure d. Standard Operating Procedure - ansd. Standard Operating Procedure On a boiler fuel system that has a €œdouble block and bleed€ arrangement: Select one: a. The main SSOVs and the vent valves open at the same time. b. The main SSOVs open before the pre-purge occurs c. The main SSOVs energize when the bleed valve de-energizes. d. The €bleed€ valve is a normally open solenoid valve. - ansd. The €bleed€ valve is a normally open solenoid valve. Who should verify a steam boiler lockout? Select one: a. Each and every contractor or employee working on the boiler. b. A representative of the plant Workplace Safety and Health committee. c. A second qualified operator. d. Nobody. - ansc. A second qualified operator. When a combustion air opening is equipped with dampers, the dampers must be Select one: a. partially open, so the burner is not supplied with too much air on start-up. b. manually closed, to prevent cold air from entering the boiler room c. interlocked with the burner, and fully closed before starting the boiler. d. interlocked with the burner, and fully open before starting the boiler. - ansd. interlocked with the burner, and fully open before starting the boiler. If a cold boiler is warmed up slowly Select one: a. condensation will not occur. b. the refractory may overheat. c. it will develop less stress due to uneven thermal expansion.
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d. it cannot over-pressurize - ansc. it will develop less stress due to uneven thermal expansion. Deaerators often have low-level alarms and low-low level trips Select one: a. in case the condensate transfer pumps trip. b. in case the boiler feedwater pumps trip. c. in case the boiler feedwater valve fails open. d. in case the boiler trips. - ansa. in case the condensate transfer pumps trip. How often should the desiccant be checked during a dry layup? Select one: a. Semi-annually. b. Bi-weekly to monthly. c. Annually. d. Daily. - ansb. Bi-weekly to monthly. When cooling down a steam boiler that has been taken out of service, a vent valve on a steam drum should be opened to: Select one: a. Let the operator know when the steaming has ended b. Allow for the increase of the water content as steam condenses c. Release air from the boiler d. Prevent a vacuum from forming in the boiler - ansd. Prevent a vacuum from forming in the boiler When warming up a steam boiler, open the boiler drum vent to Select one: a. keep a vacuum from forming in the drum, if the burner trips off. b. ensure a flow of steam through the superheater banks. c. permit the release of corrosive dissolved gases, such as oxygen and carbon dioxide, from the boiler water. d. prevent over-pressurization of the boiler during start-up. - ansc. permit the release of corrosive dissolved gases, such as oxygen and carbon dioxide, from the boiler water. If the water level in the boiler gauge glass cannot be seen, the first thing to do is: Select one: a. Ensure the glass is not leaking b. Blow off the boiler. c. Shut off the fuel supply to the boiler. d. Start the standby feedwater pump. e. Open the gauge glass drain to determine whether the glass is full or empty. - anse. Open the gauge glass drain to determine whether the glass is full or empty. New refractory in a boiler must be thoroughly dried on low fire Select one: a. to dry the refractory slowly and keep it from cracking. b. for no longer than one hour. c. by operating only the pilot burner.
