Engine Starting Systems Exam Study Guide Questions With Complete Solutions

Engine Starting Systems Exam Study Guide Questions With Complete Solutions In older reciprocating aircraft inertia starting systems, energy for cranking the engine is stored in the A. flywheel. B. battery. C. generator. - Answer- A What type of electric motor is used with a direct-cranking engine starter? A. direct current shunt-wound motor B. direct current series-wound motor C. synchronous motor - Answer- B The starter gear section on the typical direct cranking starter used for starting a large reciprocating aircraft engine A. converts the low starter motor speed into low torque to crank the engine. B. uses oil pressure to engage and disengage with the flywheel. C. uses a sun and planetary gear reduction system to transfer the energy of the starter motor to the engine flywheel. - Answer- C What assists the starter jaw in retracting after the starter motor is disengaged on a typical direct cranking reciprocating engine starter? A. centrifugal force B. return spring C. oil pressure - Answer- B Reciprocating engine starters A. are capable of continuous cranking for up to five minutes. B. have starting limits which restrict continuous cranking to one minute. C. use a two minute ON, two minute OFF cranking cycle. - Answer- B In automatic starting systems on small reciprocating engine aircraft, A. a starter solenoid is energized to allow current to flow to the starter motor. B. current flows through the ignition switch directly to the starter. C. starter current passes through the induction vibrator to ensure a hot spark is available before cranking. - Answer- A As a general rule, starter brushes should be replaced when they are approximately A. one-half their original length. B. one-third their original length. C. two-thirds their original length. - Answer- A What is used to polish commutators or slip rings? A. very fine sandpaper B. crocus cloth or fine oilstone C. aluminum oxide or garnet paper - Answer- A On a typical gas turbine engine, the starter A. cuts off when ignition of the fuel takes place. B. remains engaged until turned off in the cockpit. C. continues to crank until after self- accelerating speed has been reached. - Answer- C The purpose of the undercurrent relay in a starter- generator system is to A. provide back-up for the starter relay. B. disconnect power from the starter-generator and ignition when sufficient engine speed is reached. C. keep current flow to the starter-generator under the circuit capacity maximum. - Answer- B In a typical starter-generator system, under which of the following starting circumstances may it be necessary to use the stop-start switch? A. hung start B. hot start C. contacts stick open - Answer- A The primary advantage of pneumatic (air turbine) starters over comparable electric starters for turbine engines is A. a decreased fire hazard. B. reduction gearing not required. C. high power-to-weight ratio. - Answer- C Which is the basic component of a pneumatic starter? A. An axial flow turbine. B. A centrifugal flow compressor. C. Dual rotor turbine. - Answer- A Pneumatic starters contain a turbine which is driven by air and rotates the reduction gear train through a sprag clutch. The clutch is A. manually engaged and automatically disengaged. B. automatically engaged and manually disengaged. C. automatically engaged and automatically disengaged. - Answer- C