Aircrewman Mechanical (AWF) Test 2 Practice

These questions are part of the practice quiz. Start practicing

• In the environmental control system, which component is responsible for cooling and dehumidifying cabin air?
• Which component is used to transfer fuel between tanks or to the engine in a multi-tank system?
• The Auxiliary Power Unit (APU) provides compressed air to start engines and for air conditioning. It is also used for ground maintenance and emergency power. Which statement is true?
• How does a flight control stick or yoke relate to control surface movement?
• Which sequence lists the basic steps of a lockout/tagout procedure?
• The pre-charge pressure in an accumulator is:
• Which item is NOT a typical component of an aircraft fuel system?
• Which statement about generator cooling is correct?
• What distinguishes fine thread pitch from coarse thread pitch in aviation hardware, and why does it matter?
• What extinguisher classification is commonly used in aircraft maintenance shops that handle electrical systems and flammable liquids?
• What differentiates linear pneumatic cylinders from rotary actuators?
• Which elements are commonly included in hazard communication in a maintenance shop?
• Which device provides straight-line motion in a pneumatic or hydraulic system?
• Which indicates contamination of lubricating oil?
• Which factors determine proper cable tension for aircraft control cables?
• The unit for inductance is measured in what?
• How do you convert millimeters to inches?
• A switch that is controlled by a mechanical or electrical device and you do not have to manually turn it on or off is called what?
• Which PPE item is commonly required when handling hydraulic fluids and solvents?
• Which statement best describes the use of bleed air in naval aircraft pneumatic systems?
• Which category includes devices such as toggle switches, solenoids, or relays?
• What does an environmental control system (ECS) do, and what is an air cycle machine's role?
• When using a digital multimeter, which safety precautions should you follow?
• In a parallel circuit, how is current distributed and how is voltage across each branch?
• How do you apply safety wire to prevent rotation, and what pattern is commonly used?
• Which of the following describes common signs of ice buildup on a wing leading edge?
• What basic steps are involved in corrosion prevention?
• Whether electrical or mechanical, which term pertains to the rate at which work is being done?
• How does an accumulator pre-charge differ from the system hydraulic pressure?
• Contaminated hydraulic fluids in maintenance operations can result in what issues?
• What property is most important when selecting a lubricant for a high-temperature environment?
• What is a torque wrench and how is it used?
• Which of the following is a typical sign of a hydraulic leak?
• Used to control more than one circuit or to select one of several possible circuits. They have more than one contact or multiple contacts.
• What is the proper procedure to test landing gear retraction/extension?
• What is the purpose of safety data sheets in a maintenance shop?
• What is the role of a hydraulic servo actuator in flight control surfaces?
• Which device uses a configuration of wafers connected to a shaft to operate?
• In pneumatic systems, FRL stands for and what is each component's role?
• What is the importance of periodic inspections for corrosion and wear in AW mechanical tasks?
• Name two common landing gear issues you would inspect during a routine check.
• If the electromotive force E is held constant, power changes in direct proportion to which quantity?
• Which instrument graphically measures AC waveforms with voltage on the vertical axis and time on the horizontal axis?
• Drive Pad refers to the location of which component?
• How do you read a vernier caliper to the nearest 0.01 inch or 0.02 mm?
• Which switch is operated by a person?
• Which device stores energy in a DC power system?
• Which component removes excess heat from the lubrication system?
• What does a unilateral tolerance mean on a drawing?
• Which expression is the correct rearrangement of P=IxE to solve for E?
• Why is proper fastener sizing and inspection crucial in aircraft maintenance?
• If the resistance in a circuit is extremely small, the current will be extremely large. This situation is best described as a what?
• What is the effect of temperature on viscosity in hydraulic fluids and how does it influence performance?
• Which corrosion type requires inspection and replacement as a mitigation method?
• Which expression correctly represents electrical power in a DC circuit?
• A unilateral tolerance on a drawing means the tolerance applies in which direction from the nominal size?
• The hydromechanical constant-speed drive is driven by which fluid?
• How should you interpret a maintenance manual's torque specification?
• What does GFCI stand for, and when is it mandatory in aircraft maintenance environments?
• The simplest circuit protection device is called what?
• Located on a drive pad of an engine, or APU (an auxiliary engine). Used on most military aircraft and are brushless.
• What are common indicators of a fuel leak?
• What is backlash, and how can it affect mechanical assemblies?
• What is the function of a hydraulic check valve?
• How do Navy aircraft brake systems typically operate?
• What is the purpose of a fuel crossfeed valve?
• Which expression is a common form of Ohm's Law in equation form?
• Which action would help verify a suspected issue with the crossfeed valve in a fuel system?
• What is a circuit fuse and how does it protect electrical circuits?
• In a series circuit, what is true about current and voltages?
• What is the purpose of ground handling safety in AW mechanical tasks?
• Which protective device is the simplest to install for overcurrent protection and is designed to interrupt the circuit?
• If you suspect a hydraulic leak but cannot locate it visually, what steps should you take?
• This type of switch uses wafers to operate; wafers are mechanically connected by the shaft of the switch.
• Which diagram uses symbols to represent circuit components?
• What are the main roles of the pneumatic system on Navy aircraft?
• What is a key drawback of lithium batteries compared to lead-acid in aviation equipment?
• The current in a circuit is DIRECTLY proportional to the applied voltage and inversely proportional to the circuit resistance. This relationship is described by which law?
• What term refers to the force that causes electrons to move in an electrical circuit or conductor?
• Which corrosion type is mitigated by applying coatings?
• What is the energy unit defined as the energy consumed when one watt of power works for one second?
• What is rigging in the context of aircraft flight controls?
• Where are aircraft generators located on the aircraft?
• Which switch is described as a device with contacts arranged around a circle that can be turned to select different circuits?
• Power is independent of the order of multiplication of I and E in P=IxE.
• Why do some Navy aircraft lack a fuel jettison system?
• What is Pascal's Law and how does it apply to hydraulic systems?
• Which practice best ensures proper orientation of mechanical components during assembly?
• What term is used to describe the classification of multicontact switches by the number of poles and throws?
• If E=0, what is the power?
• Which PPE item is commonly required to protect the eyes when handling hydraulic fluids and solvents?
• This wafer switch will only remain in the momentary position as long as the user holds it there.
• A midcontact switch part of the schematic with the contacts arranged in a full or partial circle. It can be automatic or manual.
• What is the purpose of a cotter pin in a fastener assembly?
• Why is it important to follow manufacturer specifications for torque, lubrication, and assembly procedures in aviation maintenance?
• Which protective device can interrupt abnormal current and be reset after a fault condition?
• MIL-H-5606 hydraulic fluid is mineral-based. What is its notable characteristic?
• Fuses and circuit breakers are used to stop current flow or open the circuit. Such devices are collectively known as what?
• What is a bubble test in hydraulics/pneumatics, and how is it performed to locate leaks during pressure testing?
• Which device is a precision snap-acting device with a pre-set operating point?
• AC Generators actually contain three sub-generators: PMG, DC exciter generator, and the main generator. Which of the following is NOT one of these sub-generators?
• Which expression is another way to write power in terms of current I and electromotive force E?
• Which of the following is a lubrication system component that circulates lubricant?
• Improper control cable tension can cause which of the following?
• A 'picture' of the circuit that uses symbols to represent the various circuit components.
• The 400 Hz power system tolerance is +4 or -4. Which statement is correct?
• What is static friction and how does it differ from kinetic friction?
• If the voltage doubles while resistance remains the same, what happens to current?
• A reusable safety switch that breaks the circuit when the current becomes too high is called what?
• What is the purpose of environmental safety features such as fire suppression and leak detection in mechanical systems?
• A wave traced by a voltage of alternating polarity from an alternator that takes on a distinct shape is called what?
• Electrically operated control switches, and are classified according to their use.
• When performing a pressure test on a hydraulic joint, which method indicates a leak?
• What are the safety steps when dealing with hot systems?
• Which statement best describes the effect of improper torque on aircraft fasteners?
• How is a micrometer used to measure external dimensions, and what is the typical resolution?
• Which device converts AC to DC?
• In a parallel circuit, which statement about current and voltage is true?
• The device used to convert DC power to AC power is called what?
• During hydraulic pressure testing, what technique helps identify leaks visually?
• In electrical formulas, which symbol is commonly used to denote electric current?
• Why is regular calibration of measurement tools essential in maintenance work?
• Which of the following describes common fuel contaminants and their effects on fuel systems?
• Which law expresses that current is proportional to voltage and inversely proportional to resistance?
• Which expression directly gives power when using current I and electromotive force E?
• What defines hydraulic system 'normal operating pressure' and how is it checked?
• Which instrument is used to graph AC waveforms with time on the horizontal axis and voltage on the vertical axis?
• Why is proper storage of hydraulic fluids important in aircraft maintenance areas?
• What is the advantage of a redundant or crossfed fuel system on Navy aircraft?
• What is the purpose of a double-insulated tool and how is it identified?
• Which equation correctly expresses power using current I and electromotive force E?
• Which formula correctly expresses electrical power in terms of current and electromotive force E?
• In a hydraulic system, which component primarily limits maximum system pressure?
• If the resistor decreases in value, the total circuit resistance decreases. This situation most directly leads to which outcome?
• Convert 120 psi to bar.
• How do you use a torque table to select the correct torque for a threaded fastener?
• How does temperature affect material dimensions, and how is this accounted in assemblies?
• What is the primary function of wheel brakes and anti-skid sensors?
• How would you describe a torque wrench?
• Which statement correctly describes one of the three basic types of aircraft hydraulic pumps?
• If a control surface actuator shows sluggish response, what is a common corrective observation?
• In a pneumatic FRL unit, which component is responsible for removing particulates from the air?
• Periodic inspections for corrosion and wear primarily help to
• How is galvanic corrosion mitigated?
• What distinguishes SAE/Unified threads from metric threads in aviation hardware selection?
• The unit used to measure inductance is Henries. Which option correctly lists the unit name?
• Which action is a safety step when working with compressed air lines?
• What are common failure modes of control surface actuators?
• What is the process of generating electrical current in a conductor by placing the conductor in a changing magnetic field?
• In the power formula P=IxE, what does I represent?
• If a circuit has 12 volts and 4 ohms of resistance, what is the current?
• Why is lubrication critical for engine and mechanical components?
• Which equation represents power using current I and electromotive force E, with the correct form listed last?
• Why is a back-up power supply important in critical aircraft systems?
• Determines the number of places in which the circuit opens or breaks.
• Which surfaces are typically protected by anti-icing systems?
• In aircraft power systems, what is the primary function of inverters?
• The rate at which voltage completes a cycle is measured in what units?
• Toggle switches, solenoids, or relays are examples of which category?
• What is the purpose of tightening fasteners according to a torque sequence?
• What is the unit of measure for EMF that represents the electrostatic difference between two points when one joule of energy moves one Coulomb of charge?
• AC Generators actually contain three sub-generators. Which of the following are sub-generators?
• What occurs when one circuit induces current flow in a second nearby circuit?
• In an accumulator, the pre-charge pressure is typically supplied by which gas?
• What are common bearing types and their primary applications in aircraft mechanisms?
• According to Pascal's Law, how can a small force on a small piston produce a large force on a larger piston?
• What is the function of a fuel control unit (FCU) in engine systems?
• Which switch is controlled directly by a person?
• What term describes a form of energy that arises from the directional movement of electrons due to an imbalance of force?
• What is the function of a hydraulic accumulator in an aircraft system?
• During a hydraulic pressure test, what does a gradual pressure drop over time most likely indicate?
• Name two common landing gear issues you would inspect during a routine check.
• Which statement describes the difference between mechanical and hydromechanical flight controls?
• Which component in a hydraulic system moves fluid to create pressure?
• If the current through a circuit doubles while E remains constant, what happens to power?
• Which statement about hydraulic fluids and their properties is true?
• What is the function of the oil filter in a lubrication system?
• What is a locking device or thread-lock compound and when would you use it?
• The most common device used in a DC power system is which of the following?
• What safety steps should you follow when working with compressed air lines?
• In the standard power formula P=IxE, which expression is correct?
• Which term describes the process by which a changing magnetic field induces current in a conductor?
• Which statement correctly describes the typical use of ball bearings versus roller bearings?
• Which quantity expresses the opposition to current flow in a circuit?
• What is the role of a maintenance logbook in AW operations?
• What is the basic SI unit used to indicate electric current?
• Which set of variables, when multiplied, yields electric power in the P=IxE formula?
• Which device is located on a drive pad of an engine or APU and is brushless, used on most military aircraft?
• What device steps voltage up or down from the powered coil to the unpowered coil?
• A control device that uses electromagnetism to convert electrical energy into mechanical motion.
• Usually classified by the number of poles and throws.
• What is the consequence of thread pitch mismatch between components?
• Direct shorts, excessive current, and excessive heat are examples of conditions that require which of the following?
• Anti-icing systems are powered by which sources?
• When reading a simple hydraulic schematic, how is pressure direction indicated?
• Skydrol is a phosphate-ester hydraulic fluid used in Navy aircraft. What is its critical property?
• What does a check valve symbol represent in a pneumatics diagram?
• A snap-acting switch in which the operating point is pre-set and very accurately known.
• Ohm's law may be expressed as an equation.
• What is the primary reason to monitor and drain a sump containing water and sediment in a fuel system?
• Which actions verify the presence and condition of fuel filters?
• Which formula expresses Ohm's Law relating voltage, current, and resistance?
• How are lubrication intervals and lubricant selection determined for aircraft mechanisms?
• How do you correctly use a torque wrench to tighten a fastener to a specified torque?
• A switch in which the movement of the switch mechanism is relatively independent of the activating mechanism movement.
• If both current I and electromotive force E are doubled, what happens to power?
• When selecting torque from a torque table, which data is evaluated to determine the correct value?
• Explain the concept of tag-out and why it is required in maintenance.
• Which law expresses the relationship I = V / R in electrical circuits?
• Which extinguisher classification is generally appropriate for electrical fires and flammable liquid hazards in aircraft maintenance?
• Which of the following expressions is equivalent to electrical power when using current I and electromotive force E?
• What is torque in the context of aircraft fasteners and why is it important?
• Which term describes the opposition of a body or substance to the flow of electrical current, converting electrical energy into heat, light, or other forms of energy?
• Which step is essential before disconnecting any compressed air line?
• Switch that can be locked in place to prevent accidental movement of the switch.
• Which statement best describes how a flight control stick or yoke moves control surfaces?
• What is the function of a coalescing filter in a pneumatic system?
• Which unit is used for ground maintenance and emergency power loss, and provides bleed air to start engines and for air conditioning?
• What does a red X on maintenance documentation indicate?
• How is corrosion on airframes and components typically identified?
• What is a dial indicator used for in mechanical measurements?
• Identify a sign of contaminated lubricating oil?
• In corrosion prevention, what is the purpose of applying corrosion inhibitors?
• Before using a torque table, what information must be identified?
• Which method is essential to ensure proper orientation of mechanical components during assembly?
• Which law states that the current in a circuit is directly proportional to the applied voltage and inversely proportional to the circuit resistance?
• The nominal generator frequency is 400 Hz with a tolerance of which?
• What would you look for during a basic inspection for a doorway or access panel?
• Which battery type is color coded red?
• Before servicing hydraulics, which safety steps must you perform?
• In a series circuit, what happens to total resistance when you add another resistor?
• What term describes a switch arrangement that can control more than one circuit using multiple contacts?
• Which steps would you take to diagnose a fuel starvation condition?
• What is a sump in a fuel system and why is it important?
• In hydraulic schematics, what does a relief valve symbol indicate and what is its purpose?
• Under what circumstances is thread-lock compound typically applied?
• What is the typical source of pneumatic air in naval aircraft?
• Which phenomenon occurs when a current in one circuit induces current in a second nearby circuit?