ABSA 5th Class Practice Exam

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• What is a disadvantage of using threads to join pipes and fittings?
• What is the efficiency range of a pulse combination furnace?
• What shape are ring joint gaskets typically in cross-section?
• In a warm air heating system, what is the primary purpose of air filters?
• What distinguishes the SDS from the MSDS?
• Is it true that Group B refrigerants have high toxicity?
• What is the primary use of a manometer in heating systems?
• What is one bar of pressure equivalent to in the SI system?
• What is the primary purpose of feedwater system filters?
• What does the upper explosive limit of a hydrocarbon refer to?
• The efficiency range of a pulse combustion furnace is:
• What can excess pressure in a pipe system lead to?
• Which of the following is considered to be the long-term refrigerant?
• An electric motor in an air compressor with start/stop capacity control helps achieve what?
• One tonne of refrigeration is equivalent to the absorption of how much heat per minute?
• In what applications are copper and copper alloys commonly used?
• What is the operating element of an automatic sprinkler head that can be used along with a heat-sensitive bulb?
• What does the term 'latent heat' refer to in refrigeration?
• What precautions should be taken to protect a potable water sample during testing?
• What is a disadvantage of using a refractory burner?
• What happens to the refrigerant in the condenser of a refrigeration system?
• What role does a coated electrode play in welding?
• What can be said about the cooling efficiency of "shell and coil type" and "shell and tube type" condensers?
• What is the approximate surface temperature of an internally fired, gas-fired infrared heater?
• What is a method of backflow prevention that involves a separation between the potable water discharge and an open receiving vessel?
• What happens to the flame when using a proper gas burner?
• For what type of load is a capacitor start motor typically used?
• What do tables for varying wall thickness of pipe typically provide?
• Regarding indirect lighting, which of the following statements is true as compared to direct lighting?
• Is it true that at the same pressure, the boiling point of water is equal to the condensing temperature of steam?
• A valve which often contains a dashpot to cushion the action of the valve is referred to as what?
• Who typically writes the SDS/MSDS documents?
• How is the temperature of a heated space typically maintained at the desired level?
• What keeps a solenoid type fuel gas valve closed?
• What is the main characteristic of natural draft furnace operation?
• Which backflow prevention method involves two check valves with a relief valve in between?
• What describes a heating device that consists of a nickel-chrome spiral resistor embedded in refractory material?
• In a refrigeration system, what role does latent heat play?
• What causes draft in a boiler when produced naturally?
• What should be done immediately after taking a potable water sample for testing?
• In a forced draft system, how does the pressure inside the furnace compare to atmospheric pressure?
• What is the primary function of a mechanical seal in machinery?
• What does the temperature control on a steam to hot water converter manage?
• What could happen if a gas cylinder is dropped?
• Which piping support device allows for axial movement of the pipe?
• What is one property desirable in a refrigerant regarding environmental impact?
• How can the draft through a natural draft furnace be increased?
• What primarily affects the heat load from people in a room?
• In a burner with three fixed capacity nozzles, how are the secondary and tertiary nozzles ignited?
• What is the pressure of a standard municipal water distribution system?
• Which type of pipe joint is likely to offer better sealing capability?
• What is an effect of foaming in boiler conditions?
• A complete electrical circuit must be:
• What is the pressure in a fully charged self-contained breathing apparatus?
• What material is most frequently employed to absorb humidity in dry laying up?
• What can result from scale and sludge build-up in a boiler?
• Where should steam traps be installed within a system?
• What type of air conditioning system includes multi-zone and dual duct systems?
• What is the maximum operating temperature that should not be exceeded in hot water boiler operation?
• Which of the following is not a component of a reciprocating refrigeration compressor?
• What is a benefit of using a fan in a unit heater?
• What does the term "Net Refrigerating Effect" refer to?
• When should combustion of fuel in a boiler furnace be performed?
• Why do the intermediate and high burner nozzles have higher capacities than the primary burner nozzle in a boiler burner with three fixed capacity nozzles?
• What type of water system uses a private supply at around 420 KPA?
• Where should heated air ideally enter rooms in a warm air heating system?
• What happens when an oil additive loses its effectiveness during oil use?
• What factors influence the condensing temperature and corresponding head pressure of refrigerant vapor?
• In a refrigeration cycle, what happens in the compressor?
• What type of burner uses mechanical principles to atomize fuel oil?
• When a gas-fired burner is operating properly, what color will the flame primarily be?
• What is another name for an instantaneous water heater?
• The typical supply pressure of compressed air used for starting an engine is about how many kPa?
• Refrigerant mediums will evaporate when?
• What does a higher condensing pressure usually indicate about the refrigeration system?
• What is the name of the motor that has an extra winding in the stator for added torque?
• What can be used to overcome the disadvantages of a gravity circulation system?
• What is the primary function of a gas burner?
• Which type of brine is commonly used for skating and hockey rink refrigeration systems?
• What kind of oil should be used in the bearing housing of an electric motor?
• What is a mixture that has too much vapour to ignite called?
• Which advantage does oil combustion have compared to coal combustion?
• The input electrical energy arriving at the motor must be considered part of what?
• How many basic styles of flush valves (flushometers) are there?
• What is a common issue with flush valves leading to improper operation?
• What must be ensured when using a fuel oil line?
• What is a purpose of a liquid refrigerant control or regulating valve in a refrigeration system?
• What substance is known to absorb humidity inside a boiler during dry lay up?
• Which of the following could cause a flush valve on a toilet to leak?
• What condition is necessary for the combustion of fuel in a boiler furnace?
• What does a higher draft reading in a furnace generally indicate?
• What is a critical consideration when selecting materials for pipes?
• Which of the following are causes of pressure explosions?
• During the backwash cycle, what happens to the zeolite?
• What type of flame is indicative of incomplete combustion in gas burners?
• Which type of helmet is commonly used in welding?
• Which method is used in weld testing to assess the durability of a weld?
• What action should an operator take if a softener has been idle for a period of time?
• Why are the inlet vanes of a centrifugal refrigeration compressor closed during startup?
• What does a hydrostatic test evaluate?
• What causes a gradual pressure drop in a refrigeration system?
• In a hardness test on feedwater, what color indicates the presence of hardness?
• What is a smoke detector that uses a short beam between a light source and receiver called?
• What is the primary function of the condenser in a compression refrigeration system?
• Dark, heavy clothing is a type of protective gear required in which activity?
• Why is fire a distinct possibility in hot oil systems?
• To what level should the bearing housing of an electric motor be filled with oil?
• What is the standard voltage for an internal combustion engine generator set starting system?
• What is one requirement before welding occurs in a vessel?
• What type of compressor is typically used with an air atomizing burner?
• Welding together DN 50 and smaller pipe is typically done using which method?
• Which methods are usually used to connect pipes together?
• Conditions occurring within a boiler can include which of the following?
• Which emergency procedure is important for providing immediate medical assistance?
• What is a critical factor for the operation of heavy oils in combustion processes?
• Which of the following components is necessary for proper functioning in a closed expansion tank system?
• How is the synchronization of a standby generator set usually achieved?
• What document is issued to a welder upon qualification for a welding procedure?
• When discussing "Relative Density," the density is compared to what substance?
• What grade of oil is most commonly used for domestic and small commercial boilers?
• What does a double weld achieve in metal bonding?
• What makes watertube boilers generally safer than firetube boilers?
• What is an advantage of using an atomising humidifier?
• What is the primary function of a centrifugal pump in a hot water heating system?
• How is the supply valve operated in a dry standpipe system?
• In which condition should CO2 fire extinguishers not be stored?
• What is the term used to describe the combined modes of operation: backwash, injection, exchange, and rinse in a sodium zeolite softener?
• Which is a disadvantage of hermetic type reciprocating compressors?
• What should always be considered the weakest link in the electrical circuit?
• A weld made from both sides of the joint between two pieces of metal is referred to as what?
• What is NOT a component of the refrigeration cycle?
• In refrigeration systems, what does an evaporator primarily do?
• What is the latent heat of fusion of water at 0 °C?
• What is a potential hazard when working in a confined space?
• What do electronic filters primarily remove from the air?
• In a high fire hazard building, how many square meters can a single sprinkler protect?
• How do pot feeders operate in relation to chemical injection?
• A unit heater is constructed similarly to which of the following?
• Which factors are considered when choosing a backflow prevention method?
• What is the ideal mechanical advantage defined as?
• What is the approximate maximum static pressure in a fuel oil line?
• What is the minimum distance a fuel storage tank must be located from the furnace?
• A draft gauge on a furnace indicates the draft in what measurement?
• What does a Ground Fault Circuit Interrupter (GFI) compare to function properly?
• Which of the following is essential to include in an emergency plan?
• What percentage volume of natural gas is constituted by ethane?
• Water impurities can be counteracted using which of the following methods?
• What must a ladder have if it is intended for use?
• How does increasing the size of a motor affect its operation if it's oversized for the job?
• What type of protective eyewear is essential for someone carrying out welding?
• When commissioning a new hot water heating system, what is the common practice to prevent larger particles from reaching the circulating pump?
• How can an operator check if a boiler safety valve will open at its set pressure?
• What is the purpose of a condenser in a refrigeration system?
• What does the saturation temperature of the refrigerant in the condenser correspond to?
• What does a penetrameter indicate in welding?
• What is the approximate maximum static pressure in a fuel oil line?
• Where are return air openings typically located in air distribution systems?
• A high limit control switch on a boiler typically:
• What is the term used to describe the amount of heat required to raise the temperature of a unit mass of a substance by 1 degree Celsius without changing its state?
• What type of liquid is typically found in the capillary tube of a remote bulb thermostat?
• Which bearing type is specifically designed to handle axial loads in addition to radial loads?
• Which water distribution system is used for high demand and insufficient pressure on upper floors?
• Which of the following conditions prevents the use of copper and copper alloy piping in power plants?
• The TDS (total dissolved solids) test is conducted using which of the following?
• What is the importance of rehabilitation services in an emergency plan?
• Which of the following thermodynamic properties apply to refrigerants?
• What are the two main categories of manufactured pipe?
• What process occurs when refrigerant vapor turns into a liquid in the condenser?
• What type of refrigeration cycle is most commonly used in household refrigerators?
• Which type of oil burner is utilized when oil is supplied under high pressure?
• Which types of airborne particles can air filters in warm air heating systems trap?
• How can the expansion of piping be effectively controlled?
• If a compressor fails to start while the motor is operational, what could be a likely cause?
• CO2 fire extinguishers are suitable for which class of fires?
• What does an intermittent pilot do during operation?
• What is the term for the backflow prevention method that uses two independently acting check valves?
• At what speed does the centrifugal switch cut out the starter winding of a split-phase motor?
• Internal suction and discharge valves are found in which type of refrigeration compressor?
• If exhaust fans are not used over cooking equipment, what percentage of heat gain is considered in calculations?
• How do high efficiency fluorescent ballasts aid in energy conservation?
• How many basic types of evaporators exist based on operation?
• Sizing a larger motor than necessary leads to what issue?
• To achieve atomization, heavy oils must be heated to approximately how many degrees Celsius?
• What could potentially cause defective condenser operation?
• Which statement is true about pulse combustion furnaces?
• What is the maximum temperature of water in a gravity hot water system?
• What happens to relative humidity when the air temperature increases without adding moisture?
• An anchor chair is primarily used in relation to pipes and fittings to do what?
• What is required to prevent oil from spreading beyond the confines of a heater in the event of a ruptured tube?
• In a refrigeration system, the presence of bubbles in the sight glass typically indicates what?
• Which two elements are used to control combustion air flow in a fire heater?
• Which of the following indicates a problem with a boiler's performance?
• What characteristic does a soldered link provide in an automatic sprinkler head?
• Which of the following are the two overall types of weld testing and inspection?
• What happens when the inlet vanes of a centrifugal compressor are held in a closed position?
• What happens to elemental impurities during the regeneration of a sodium zeolite softener?
• What indicates that a gas-fired burner is burning fuel correctly?
• What is a key characteristic of safety footwear used in welding?
• What is the unit of measure for a moment of force?
• Which factors are necessary for complete combustion of a fuel?
• To avoid start-up difficulties in cold weather, a thermal fluid must have what property?
• What is the primary function of an interrupted pilot?
• Which of the following types of bearings are commonly found in electric motors?
• For how long is a welder's certificate typically valid?
• Which of the following is NOT considered a cause of furnace explosions?
• What type of water distribution system is used in high buildings with tanks at different intermediate levels?
• In refrigeration, what primarily causes pressure drops across high and low pressure sides?
• What is the purpose of a steam trap?
• Why is it not recommended to use an on-off switch with steam grid humidifiers?
• What is the primary purpose of a refrigeration expansion valve?
• What does the term 'scale' refer to in boiler conditions?
• Which hot water circulation system is self-balancing due to equal circuit lengths?
• Which of the following best describes the role of a coupling in a compressor?
• Which of the following is NOT a problem associated with flush valves (flushometers)?
• According to the second law of thermodynamics, heat will flow from which temperature to which temperature?
• When changing 1L of water into steam, the volume increases to how many liters?
• How many reasons can interrupt normal lighting and require emergency lighting?
• What is typically required for successful ignition in a multi-nozzle burner?
• When using a halide torch detector, under what condition will it detect system leaks?
• What is carbon that is not combined with hydrogen referred to as?
• Which of the following are categories of air conditioning systems?
• What voltage does the step-up transformer boost from 120 V to in an electric ignition system?
• Which type of fuse is used for ratings exceeding 30 amperes?
• What is a common characteristic of soldered pipe joints?
• In a low temperature application, how does the fin spacing in a finned evaporator compare to that in a medium temperature evaporator?
• How many personal locks are typically issued to an employee?
• What is typically required to ensure safe operation of a piping system?
• What does a hot water gravity circulation system rely on to move water through the pipes?
• How many valves are typically present in a toilet flush tank?
• Which of the following is an advantage of centrifugal refrigeration compressors?
• What is welding flash?
• What is the typical application of refrigerants in a refrigeration cycle?
• Which of the following is considered the building block of all matter?
• Which of the following components can cause a furnace explosion if not managed properly?
• What is the purpose of ensuring a proper purge in a fuel system?
• What is meant by "precipitate" in the context of feedwater treatment?
• What type of defects can a fluorescent penetrant test detect?
• What is a modern method of removing dissolved solids from a boiler?
• Which two aspects are important for safety before welding is performed?
• How do pot feeders function in a boiler system?
• What are the two types of expansion joints?
• What allows for more uniform temperature distribution in a forced warm air furnace heating system?
• What type of seal uses bolts to tighten its sealing element?
• What is the minimum temperature of water required for a hydrostatic test of a boiler?
• At 100 °C, what is the latent heat of evaporation of water?
• Ultraviolet light is primarily used to remove what from the air?
• Which of the following describes the role of a circulating pump in a heating system?
• What should be done if the safety relief valve is set too low?
• Which of the following are principal parts in a closed cycle compression refrigeration system?
• Which of the following indicates a malfunction in a sodium zeolite softener?
• What is the primary function of flameproof gloves in welding?
• Which gas is commonly known for being toxic and is a refrigerant?
• Which of the following is NOT an advantage of fluorescent lighting?
• In a hot water boiler, what is the minimum pressure differential between the operating pressure and the safety relief valve set pressure?
• An air compressor that employs start/stop capacity control must be equipped with what type of motor?
• How frequently do burner and fan motors that use standard bearings generally need lubrication?
• Which component of a mechanical seal is designed to prevent axial leakage?
• What is the role of the gas burner in relation to fuel preparation?
• What are the most common types of bearings used in electric motors?
• What should be done if the welding method is not qualified under the applicable code?
• What does a hardness test indicate in welding?
• What is the minimum distance required from a furnace to an oil storage tank?
• Which of the following best describes the purpose of exhaust fans in cooking areas?
• What commonly indicates the need for backwashing a pressure filter?
• What is the function of a fuse in an electrical circuit?
• Which of the following statements is true regarding refrigeration chillers?
• What type of compressor uses impellers to draw in vapor?
• What is the primary function of the condenser in a refrigeration system?
• Which chemical compounds are part of the "exchange" stage in a softener's regeneration cycle?
• Which condition can increase the likelihood of a furnace explosion?
• Which type of gas burner is commonly used in packaged boilers?
• In high efficiency furnaces, if the flue gas temperature drops below 65 degrees C, what happens?
• What are the combustible components of coal?
• What is the role of excess air during the combustion in a boiler?
• What is the approximate efficiency range of hot oil convection heaters?
• In a pulse combustion furnace, each explosion produces approximately how much energy in kJ?
• What is the measure of a lamp's efficiency?
• The most common oil heater combines radiant heat with which type?
• What characteristic should an ideal refrigerant possess?
• What is the primary function of a vent damper in a warm air furnace?
• What type of valve can be operated by chains in the event of a gauge glass breaking?
• What does a tensile test measure in weld testing?
• How does the inclined manometer compare to the U manometer in terms of accuracy?
• What is a frequent cause of serious accidents related to valves?
• Which of the following could cause a toilet's float valve to leak?
• Which of the following is NOT a type of compressor seal?
• What is the name of the refrigerant characterized as nonflammable, odorless, and nontoxic, with a boiling point of -40.6 °C?
• In a combustion process, excess air is typically used to achieve what?
• What is the primary function of an air separator in a closed expansion tank system?
• How can you confirm that you've added sufficient refrigerant to a new system?
• In the case of a simple icebox, what occurs between air and ice?
• In welding, what does the result of a hardness test indicate?
• In a microturbine, the air is compressed in which component?
• What is one way to increase draft through a natural draft furnace?
• Before admitting any steam to a steam piping system, what is imperative to ensure?
• What role does the evaporator play in a refrigeration system?
• Where is spot heating commonly utilized?
• Relative humidity decreases when air temperature is lowered, without adding moisture, true or false?
• What is another term that means the same as "carryover"?
• Which type of humidifier breaks water up into a mist or fog?
• Which statement is true about oil additives?
• What must a manufacturer's welding method do to ensure quality?
• Which of the following is an advantage of using oil over coal as a boiler fuel?
• What is the main purpose of a condenser in a refrigeration system?
• Which of the following contributes to the lifespan advantages of fluorescent lighting?
• What is the main issue with a poorly balanced gravity circulation system?
• What type of hot water circulation system is described as being difficult to balance due to variations in pipe lengths?
• What is one advantage of expansion bends over expansion joints?
• What clearance should be maintained around sprinkler heads above large piles of combustible materials?
• Which of the following is not an advantage of heat removal luminaires?
• What is the most commonly used refrigerant control system that consists of a bellows or diaphragm?
• What temperature should a thermostat automatically shut down an electric snow melting unit when the outdoor temperature exceeds?
• What is a flushometer also known as?
• What type of pump is commonly used in hot water heating systems?
• Where are steam traps usually located in a steam line?