ABSA 5th Class Practice Exam - Practice Test & Study Guide – All Questions

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How a two-pipe direct return hot water system works and why it uses separate supply and return pipesHow does a two-pipe direct return hot water system typically function?Safety first: before welding a power engineer must isolate equipment and clear combustiblesBefore any welding can take place in one of his/her vessels, what must a power engineer ensure?

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

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