NOCTI Maintenance Practice Test

These questions are part of the practice quiz. Start practicing

• When machining a rectangular part on a milling machine, to finish the third side must be placed in the vise against
• In a parallel circuit, what is the total resistance of the 6 Ω and 3 Ω resistors in parallel?
• If a motor draws 6 A at 230 V, what is the electrical input power in watts?
• What does the NFPA 704 hazard diamond indicate?
• In lockout/tagout, which step explicitly confirms energy is zero?
• The maximum allowable gap between the face of the wheel and the tool rest on a pedestal grinder is
• A slip clutch is used as what?
• Bearing seizure is most directly caused by which of the following during operation?
• In a typical US electrical system, what does the color black usually indicate?
• What is the function of a soft starter in motor control?
• How is torque defined in fastening applications?
• Which part of a micrometer provides 0.001 inch increments for measurement?
• In ladder logic, what does a normally open contact indicate?
• Which statement correctly describes the storage of a new rolling element bearing?
• When selecting lubrication for bearings, what is a key factor to avoid over-lubrication?
• What is the difference between coarse and fine threads in fastening?
• In electrical control circuits, what does a normally closed contact do?
• What is a ground fault and how is it detected?
• Maintenance drawings are commonly referred to as which type?
• The drum surface that friction pads contact should be made of which material?
• In a pneumatic work station sequence, which option correctly lists the order from inlet to outlet?
• Why is data collection important during troubleshooting and fault investigation?
• Which property is lower in cast iron compared to structural steel?
• In a drum brake, the part that carries the friction material and presses against the drum is called the what?
• When handling refrigerants, what safety and environmental considerations are critical?
• What is the difference between AC and DC motors?
• For vernier caliper measurements, which scale provides the fractional measurement portion?
• Which problem-solving method is commonly used in maintenance to identify root causes?
• Which belt drive type is known for no slip and a precise speed ratio?
• How does torque specification relate to fastener preload?
• What is the difference between a double-acting and a single-acting hydraulic cylinder?
• After isolating energy sources in a lockout/tagout procedure, which step follows?
• Which component vents excess fluid to prevent system damage and limit pressure?
• In a hydraulic system, what is the primary purpose of a reservoir?
• A double acting hydraulic cylinder
• What causes cavitation in a pump?
• What is lockout/tagout, and why is it important?
• When using a multimeter to measure current, why must the meter be placed in series with the load?
• Copper tubing can be best cleaned by using
• Two mating parts are to
• If a hydraulic system's piston area remains constant and system pressure increases, what happens to actuator force?
• Which instrument measures pressure, typically in gas or air systems?
• What is defined as the initial step in a structured troubleshooting process?
• Tensile strength is the resistance a metal has to being
• What is bearing preload and why is it important?
• How many positions does a spring centered valve have
• To check the run out of a shaft, which tool is best to use?
• Under which condition would you employ an easy out?
• What are the basic steps of a root cause analysis for a machine failure?
• What is a likely result of a loose welding cable terminal?
• Which statement best describes predictive maintenance PdM?
• Which valve is used to hold pressure while the work cylinder is withdrawn?
• Which of the following is NOT listed as a common cause of bearing overheating?
• In a ladder diagram, what does a normally open contact do when energized?
• Which statement best defines shaft end runout?
• What is a short circuit and why is it dangerous?
• What does a Class ABC fire extinguisher protect against?
• What is a manometer used for?
• What happens in a hydraulic circuit when the relief valve opens?
• How would you determine the correct belt tension for a new belt drive?
• What is the first step in a structured troubleshooting process?
• At each pneumatic work station, the proper sequence of components is which of the following?
• The main purpose of lubrication is to
• Which statement best describes the function of brake lining in a braking system?
• The 45 degree offset formula is
• A slip clutch is used
• What effect does voltage imbalance have on a three-phase motor?
• Which statement best describes why PM documentation is important?
• Which statement describes the prerequisite before bench testing an electrical control panel?
• Hydraulic energy is primarily directed and controlled by which component?
• Which factor most influences the clamping force when torquing a bolt?
• How do you determine lubrication interval for a bearing in a PM program?
• What is the purpose of a sleeve bearing in a shaft-bearing arrangement?
• What does full-load amps on a motor nameplate indicate?
• The slip clutch protects components by doing what?
• In an electrically operated motor brake, what action occurs when current is applied?
• What are typical signs that a gearbox is low on lubrication?
• How does clamp load relate to torque in fastener seating?
• In the same parallel circuit, what is the power dissipated by the 6 Ω resistor?
• What is the function of a relief valve in a hydraulic circuit?
• Which statement about coarse threads is accurate?
• What device converts compressed air energy into linear motion?
• What is the purpose of aligning belt centerlines within tolerance?
• When the regulator is attached to a fully charged cylinder of an oxygen tank the cylinder should
• What is the process called that coats steel with zinc to prevent corrosion?
• Which PPE is essential when performing maintenance on rotating machinery?
• How many positions does a spring centered valve have?
• Which device is used to adjust motor speed and torque to load?
• In thermography, what does a hotspot typically indicate?
• Pascal's law states what principle in hydraulic systems?
• Which statement about sequence valves is true?
• What is the purpose of reading a schematic in an electrical control system?
• Which is the most accurate safety practice when performing maintenance on equipment that could be energized?
• The belts in a multiple V-belt drive should be replaced
• What is the primary purpose of lockout/tagout procedures during maintenance?
• Tight connections should be maintained on welding cable terminals to eliminate what?
• During troubleshooting, which outcomes are supported by data collection?
• Fretting corrosion is caused by
• Centrifugal force is defined as
• Opening the regulator on a fully charged oxygen cylinder too quickly can cause which damage?
• The compressor safety valve is intended to?
• The seal in a centrifugal pump is used to prevent which of the following?
• Why is accurate PM documentation important?
• MTBF stands for Mean Time Between Failures. What does it measure?
• When using a vernier caliper to measure an external diameter, which readings are taken and how are they combined?
• What is a hot work permit and when is it needed?
• Which part of the milling vise is typically stationary when securing a rectangular part to finish a side?
• Name two common types of belt drive and one advantage of each.
• If a circuit has a 120 V supply and a 24 Ω resistor, what is the current through the resistor?
• When pressing on a bearing, you should?
• How should a new rolling element bearing be stored?
• What is the function of a pneumatic actuator in a machine?
• Which welding condition can lead to spattering?
• Why is proper alignment important in a gear train?
• What is the purpose of vibration analysis in maintenance?
• What is the primary function of lubrication?
• Seizure in bearings and shafts is a condition resulting from which factor?
• Which of the following is a common sign that a motor may be overheating?
• Which statement is true about carbide cutting tools compared with high-speed steel?
• When aligning belt drives, which method checks misalignment within tolerance?
• How can you identify a leaking pneumatic cylinder in operation?
• Which device is commonly used to detect ground faults in electrical systems?
• If the supply voltage in that parallel circuit is doubled from 120 V to 240 V, what happens to the total current?
• What is the primary function of a torque wrench?
• Which statement is true about single-acting hydraulic cylinders?
• In a caliper-type disc brake, what is the caliper's function?
• When selecting a lubricant for bearings, what is the main distinction between grease and oil?
• What is the function of a GFCI and where is it typically used?
• Which PPE is recommended when performing machine maintenance involving cutting or grinding?
• Which mechanism best describes fretting corrosion in bearings?
• What is the first step in a lockout/tagout procedure when performing maintenance on a powered machine?
• What is the maximum gap allowed between the wheel face and the tool rest on a pedestal grinder?
• In a motor control circuit, what is the function of a contactor?
• In the color-coding example using Black, Red, Green, and Blue, which color is listed as option C?
• The purpose of a compressor safety valve is to?
• Which factor should be considered when adjusting lubrication interval?
• Which statement best describes preventive maintenance PM?
• When replacing belts in a belt drive, replacement should be performed
• BTU stands for British Thermal Unit and is a measure of what?
• The valve type that should be used to control a single acting cylinder is which?
• In an internal drum brake, friction material contacting the drum is called what?
• Which method is used to assess rotor balance?
• The magnet that turns inside the motor is the?
• Why is it important to re-check torque after the wrench reaches the target setting?
• What is the primary difference between high-speed steel (HSS) and carbide cutting tools?
• Which component reduces backlash in screw thread assemblies?
• Thrust loads are ______ to a shaft
• Compared to structural steel, cast iron has what tensile strength?
• For an oxygen regulator attached to a fully charged cylinder, the cylinder should
• A 230V three-phase motor is connected to a supply that measures 208V. What issue might occur?
• In fastening, how is preload best described?
• In the color code example, which color is option B?
• In mechanical drawings, what does a dashed line typically represent?
• What is a primary benefit of implementing a preventive maintenance (PM) schedule?
• In a single-line electrical diagram, what does a normally open contact indicate when the actuator is not energized?
• What is the difference between preventive maintenance PM and predictive maintenance PdM?
• What is thermal imaging used for in maintenance?
• The function of a pressure relief valve is to
• What is the main purpose of lubrication in bearings?
• In troubleshooting a hydraulic circuit with a noisy pump which of the following is not a likely cause of the trouble?
• Which components are included in a standard FRL unit for a pneumatic system?
• Fretting corrosion is caused by
• How do you read a motor nameplate?
• Which of the following is NOT part of the 5S method?
• What is the difference between static and dynamic alignment of shafts?
• Overload clutches protect the drive motor and equipment when what?
• What safety steps should be performed before bench testing an electrical control panel?
• In the same parallel circuit, what is the current through the 3 Ω resistor?
• In a gearbox, what is a common effect of gear wear?
• Which sequence correctly outlines the basic steps of a standard lockout/tagout procedure?
• What is the primary purpose of a preventive maintenance program?
• What is the purpose of a solenoid valve in a pneumatic or hydraulic system?
• Drawings used most frequently in maintenance work are?
• What is a thermography test used for in maintenance?
• What is the purpose of reading P&ID diagrams in maintenance?
• Rack and pinion are employed when it is necessary to change
• A globe valve as a flow control device is advantageous because
• In a parallel circuit with resistors 6 Ω and 3 Ω across 120 V, what is the total current drawn from the source?
• Soft steel coated with zinc is called what?
• In a hydraulic system, which function best describes the reservoir's role besides storing fluid?
• How does motor horsepower relate to the load?
• Which tool is NOT commonly used to check shaft alignment?
• Galvanic corrosion is defined as corrosion due to electrical contact between dissimilar metals. How can it be prevented in assemblies?
• What is the relationship between flow rate and hydraulic cylinder speed?
• Current going to an electrically operated motor brake
• A pneumatic 3/2 valve has how many ports and how many positions?
• How do you read a micrometer to the nearest thousandth of an inch?
• The purpose of grounding electrical circuits is to
• Why is hydraulic oil cleanliness important and how is it maintained?
• Which statement best describes the role of a P&ID in maintenance planning?
• What is the primary piece of safety equipment in the machine shop?
• Which practice best reduces wear in a hydraulic system?
• A sequence valve in hydraulic circuits is used to
• A 1.5 HP motor runs on 230 V and draws 6 A with an efficiency of 85%. What is the electrical input power and approximate mechanical output?
• Wear strips are used in high-speed manufacturing operations to
• Because switches can fail, after opening a disconnect it is always safest to
• Which sequence best describes proper use of a torque wrench to achieve accurate tightening?
• Centrifugal force is the
• What device is used to prevent fluid leakage around the shaft in a centrifugal pump?
• What is the recommended approach to address a hydraulic system leak around a seal?
• When vibration is a factor, which screw thread series is used?
• Which statement best describes a dead short in an electrical circuit?
• What is the function of a hydraulic relief valve?
• What is a thermocouple and what is it used for?
• Copper tubing can be best cleaned by using which material?
• What does a dead short mean in an electrical circuit?
• What does a 3/2 valve do in a pneumatic system?
• How do you identify an open circuit in a motor control system?
• What is the primary purpose of a check valve?
• What is a dial indicator used for in a maintenance shop?
• The low - pressure switch opens its contacts
• When a clutch is fully engaged, which of the following describes what happens?
• What is the main purpose of a lockout/tagout device such as a padlock?
• What is one effective way to improve energy efficiency in a motor-driven system?
• Bubbles showing in a liquid indicator usually means the system is
• Which outcome is most associated with properly addressing a hydraulic seal leak by replacing worn seals and correcting alignment?
• Which statement best describes the benefit of data logging during maintenance activities?
• A globe valve may be used as a flow control valve because
• Which action ensures the disconnect cannot be re-energized after service work?
• In a hydraulic system, which component is primarily responsible for directing flow and pressure?
• When a three-phase motor hums but won't turn, what are the most common causes to check first?
• Which component of lockout/tagout physically prevents re-energizing?
• Which tool is commonly used to check shaft alignment?
• Which statement best describes the potential effect of excessive shaft end runout on a rotating assembly?
• Which of the following is NOT a 5S step?
• When a clutch is fully engaged, what occurs?
• In a hydraulic system, how does increasing system pressure affect actuator force if the piston area remains constant?
• How can linkage backlash be controlled?
• The capacity of a warm air furnace is usually rated in which units?
• What is the purpose of an FRL unit in a pneumatic system?
• Abrasive cutoff saws separate material by grinding. This makes them valuable for cutting
• Which option best describes the purpose of a torque specification chart?
• Spattering and undercutting are caused by which condition?
• What is the primary purpose of a torque specification chart for bolts?
• Which of the following is NOT a direct benefit of a preventive maintenance program?
• In the context of the provided material, which motor component is described as the magnet that turns inside the motor?
• What basic safety precautions are required when welding?
• What instrument is used to determine insulation resistance in windings?
• What is the correct final action in a lockout/tagout procedure after maintenance is completed?