1) Why should the pigtails on the brushes never alter or restrict the free motion of the brushes? a) To minimize side wear of the brush   b) To increase sparking   c) To facilitate easy reassembly 2) What principle governs the operation of DC motors and states that a current-carrying conductor in a magnetic field experiences a force perpendicular to both the current direction and the magnetic field? a) Faraday's Law   b) Lorentz Force   c) Ohm's Law 3) How does commutation contribute to the continuous rotation of a DC motor? a) By regulating the speed of the motor   b) By controlling the voltage applied to the armature windings   c) By switching the direction of current in the armature windings as the rotor rotates 4) Where are the armature windings located in a DC motor? a) On the stator   b) On the brushes  c) On the rotor 5) What components can create the external magnetic field in DC motors? a) Brushes and commutator   b) Armature windings   c) Permanent magnets or field windings 6) How do brushed DC motors differ from brushless DC motors in terms of commutation? a) Brushed motors use electronic commutation, while brushless motors use brushes and a commutator.   b) Brushed motors rely on permanent magnets, while brushless motors use field windings.  c) Brushed motors use brushes and a commutator for current switching, while brushless motors use electronic commutation without brushes. 7) How can the speed and torque of a DC motor be controlled? a) By adjusting the rotor position   b) By varying the applied voltage or current to the armature windings   c) By changing the direction of the external magnetic field 8) What is the role of back electromotive force (EMF) in a DC motor, and how does it affect motor efficiency? a) Back EMF opposes the applied voltage, causing motor stalling.   b) Back EMF supports the applied voltage, enhancing motor efficiency.   c) Back EMF opposes the applied voltage, leading to reduced current flow and improved efficiency as motor speed increases. 9) What does TRU stand for in the context of aircraft systems? a) Transformer Rotor Unit   b) Transformer Rectifier Unit   c) Transducer Relay Unit 10) What are the primary functions of a Transformer Rectifier Unit (TRU) in aircraft applications? a) Converts DC power to AC power   b) Converts 120V AC power to 28V DC power   c) Provides ground power to the aircraft 11) What is the source of the 120V AC power that a Transformer Rectifier Unit (TRU) typically converts? a) Aircraft batteries   b) Ground Power Unit (GPU)   c) Engine or APU generators 12) What is the primary function of a Rotary Frequency Converter? a) To generate electrical power   b) To convert power from one frequency to another   c) To store electrical energy 13) How is the mechanical coupling typically achieved in a Rotary Frequency Converter? a) Through direct connection   b) Using hydraulic systems   c) Via pneumatic linkage 14) Besides direct coupling, what alternative method can be used for the mechanical coupling of a Rotary Frequency Converter? a) Magnetic linkage   b) Belts & sheaves   c) Gear-based connection 15) What is the primary purpose of ignition systems in heat engines? a) To cool the engine   b) To initiate combustion by igniting the fuel-air mixture   c) To regulate fuel flow 16) What is the specific function of the ignition system in spark ignition engines? a) To generate electricity for the vehicle   b) To create a spark and ignite the fuel-air mixture   c) To control air intake into the engine 17) What do symbols represent in an electrical schematic? a) Mathematical equations   b) Graphical representations of electrical components and connections   c) Geographic locations of components 18) How do symbols convey information in an electrical schematic? a) hrough colors and patterns   b) By using standardized conventions and graphical elements   c) By numerical values assigned to each symbol 19) What do lines and connections represent in an electrical schematic? a) Physical barriers between components   b) The flow of electrical current and paths in a circuit   c) Temperature variations in the circuit 20) What is a key advantage of soldered connections in wire termination regarding reliability? a) Increased flexibility   b) Strong and reliable bond   c) Enhanced conductivity 21) Why do soldered connections offer low electrical resistance? a) Due to the use of insulating materials   b) Because of the compact size   c) The solder forms a solid joint, ensuring efficient current flow 22) How does solder protect wire connections from corrosion? a) By increasing wire flexibility   b) By forming a protective barrier  c) By reducing electrical resistance 23) What is a characteristic of soldered connections that contributes to neater wiring installations? a) High electrical resistance  b) Compact size   c) Enhanced flexibility 24) In applications requiring precise electrical signals, what advantage does soldering offer? a) Increased temperature resistance   b) Enhanced signal integrity   c) Improved mechanical stress resistance

ELECTRICAL AND MECHANICAL INTERFACE PART 2

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