352 Which of the following statements about propellers is true?
O Angle of attack is the angle between the chord line of the blade and the relative airflow.
O Critical tip speed is the RPM at which there is a risk of some part of the blade stalling.
O Effective pitch is the distance that a propeller would move forward in one turn if there were no slip.
O Blade angle is the angle between the chord line of the blade and the shaft axis.
353 What is propeller blade angle?
O The angle between the chord line of the blades and the plane of rotation of the propeller.
O The angle between the chord line of the blades and the axis of the propeller shaft.
O The angle between the chord line of the blades and the total reaction.
O The angle between the chord line of the blades and the free stream airflow.
354 Why is it necessary to vary blade angle from root to tip?
O To ensure that angle of attack is acceptable over the whole blade.
O To avoid overstress.
O To achieve higher performance..
O To ensure that most thrust is produced at the tips.
355 Which of the following is true of a constant speed propeller?
O Blade angle increases with increasing TAS.
O Governor keeps blade angle constant.
O Governor lubricates only the propeller shaft.
O Blade angle decreases with increasing TAS.
356 Which of the following will increase the angle of attack of a fixed pitch propeller?
O Increase RPM and decrease TAS.
O Increase loading..
O Μakes propeller moving velocity zero.
O Decrease RPM and increase TAS.
357 Which of the following will increase the angle of attack of a fixed pitch propeller?
O Pull up into a climb without increasing power.
O Push down into a dive without decreasing power.
O Decrease RPM while diving.
358 How does drag on a windmilling propeller compare with that on a stationary one?
O Higher.
O Lower.
O Lower or higher depending on tip stall.
O Equal.
359 During take-off using a right handed tractor propeller, torque reaction will cause?
O Left roll and yaw.
O Pitch up.
O Maximum performance.
O Right roll and yaw.
360 During the take-off run using a right handed tractor propeller, the torque reaction will cause?
O Decreased load on right wheel and increased on left.
O Increased load on right wheel and decreased on left wheel.
O Increased load on the total gear.
O Increased load on front wheel.
361 During take-off using a tail wheel and right handed tractor propeller, the asymmetric blade effect will cause?
O Left yaw.
O None of the them.
O Left roll.
O Pitch down.
362 During take-off using a tail wheel and right handed tractor propeller, gyroscopic precession will cause?
363 Propeller gyroscopic precession force is induced by?
O RPM change.
O Right yaw and left roll.
O Left yaw and right roll.
O MΑP change.
364 Geometric pitch is?
O The distance moved forward through the air in one revolution, if angle of attack was zero.
O Helix angle minus angle of attack.
O Helix angle with maximum TAS.
O The distance moved forward in one revolution per second.
365 Helix angle is?
O Blade angle minus angle of attack.
O Blade angle plus angle of attack.
O Wing blade wash out..
O Blade angle applied in real life.
366 Blade angle is?
O Helix angle plus angle of attack.
O The angle that velocity due to forward motion is maximum .
O The angle for best performance.
367 A feathered propeller produces?
O Minimum drag.
O Maximum drag.
O Optimum spiral diving capability .
O Minimum glide speed.
368 For a fixed pitch propeller?
O Angle of attack decreases with increasing TAS.
O Blade angle increases with increasing MΑP.
O Angle of attack increases with increasing TAS.
O Ηelix angle decreases with increasing RPM.
369 For a fixed pitch propeller?
O Angle of attack increases with increasing RPM.
O Blade angle increases with increasing RPM.
O Angle of attack increases with aid of governor.
O Angle of attack decreases with increasing RPM.
370 For a constant speed propeller?
O Βlade, helix angle and angle of attack remain constant.
O Blade angle decreases with increasing RPM.
371 For a constant speed propeller?
372 If the propeller RPM lever is pushed forward in a glide it will?
O Increase drag.
O Increase range.
O Increase spark plug fouling .
O Improve cooling.
373 If propeller pitch is increased in a long glide?
O RPM will decrease and range will increase.
O RPM will remain constant.
O RPM and range will decrease.
O RPM will increases and range will decrease.
374 A constant speed propeller.............................compared to a fixed pitch propeller?
O is more efficient.
O is lighter.
O is stronger.
O is simpler in construction.
375 Propeller blade twist?
O Reduces blade angle from root to tip.
O Increases blade angle from root to tip.
O Is for strength only.
O Varies with RPM selection.
376 Angle of attack is?
O Lowest at the tips.
O Lowest at the roots.
O Lowest at the 30% radius.
O Uniform at all points along the blade.
377 If TAS increases at constant altitude, a constant speed propeller will…………………………………………………………….………?
O maintain constant angle of attack.
O decrease helix speed.
O increase blade speed.
O maintain constant blade angle.
378 When leaning the fuel/air mixture at altitude, to achieve the most efficient mixture, the control is first moved towards the LEAN position until the engine RPM:
O decreases. The mixture control is then moved slightly to the RICH side of peak RPM.
O increases. The mixture control is then left in that position.
O increases by approximately 125 RPM. The mixture control is then moved slightly more towards the LEAN position.
O D - decreases by approximately 125 RPM. The mixture control is then moved slightly more towards the LEAN position.
379 The restrictive throat of a carburettor venturi changes the characteristics of the air that passes through it. These are:
O a drop in ambient air pressure and velocity increase.
O a dynamic pressure increase and a velocity decrease.
O a dynamic pressure decrease and a velocity increase.
O a dynamic pressure increase and ambient air pressure increase.
380 Which of the following prevents excessive engine oil pressures?
O An oil pressure relief valve.
O A ball valve.
O A by-pass valve.
O A non return valve.
380B For every crankshaft rotation in a piston engine, the camshaft rotates:
O one half of one revolution because the camshaft operates at half engine speed.
O the carburettor float chamber.
O the combustion chamber.
O the CHT sensor thermowell.
381 When a fuel priming pump is used before starting an engine, the fuel is normally delivered directly to:
O the induction manifold.
382 The valve that allows oil to by-pass a blocked engine oil cooler is:
O pressure activated.
O temperature activated.
O gravitationally activated.
O differentially density activated.
383 At sea level, the power developed by a four-stroke piston engine:
O increases along with RPM.
O increases proportional to RPM to about 55% throttle setting, then decreases.
O increases proportional to RPM to about 55% throttle setting, then remains constant.
O increases proportional to RPM to about 55% throttle setting, then increases.
384 In respect of a low wing aircraft, failure to close a fuel strainer drain valve prior to flight:
O may cause fuel starvation if the electric pump is not used.
O will cause a lean mixture moment by moment to be produced by the carburettor.
O may result in an inability to start the engine due to the formation of a vapour lock in the tank.
O will cause RPM instability during taxying.
385 Information transmitted to the cockpit mounted engine oil temperature gauge is provided by a temperature sensor fitted:
O after passing through the oil cooler but before reaching the hot sections of the engine.
O anywhere within the hot sections of the engine.
O upstream of the oil cooler.
O within the engine sump.
386 Detonation of the fuel/air mixture in a piston engine has to do with:
O weak mixtures and high cylinder head temperatures.
O a higher octane grade than certified.
O rich mixtures and low cylinder head temperatures.
O fouled spark plugs due to prolonged engine operation using over rich mixtures.
387 During pre-ignition, the smooth running of a four-stroke piston engine is often disturbed by:
O a carbonised hot spot in the combustion chamber causing premature ignition of the fuel/air mixture.
O an uncontrolled explosion of the fuel/air mixture.
O slow burning of a rich mixture in a hot engine.
O rapid combustion of any mixture exists in the hot cylinder.
388 A 65 amp/hour battery will, in theory, supply 13 amps for up to:
O 5 hours.
O 2 hours.
O 4 hours.
O 6 hours.
389 Two 12 volt 65 ampere/hour capacity batteries connected in series would result in a total capacity of:
O 65 ampere-hours at 24 volts.
O 35 ampere-hours at 12 volts.
O 45 ampere-hours at 24 volts.
O 65 ampere-hours at 12 volts.
390 A magneto that inadvertently becomes disconnected from its ignition switch will:
O cause the engine to continue running when both magneto switches are turned off (earthed).
O cause a dead cut when the other magneto is switched off.
O cause the failure of one plug in each cylinder.
O cause the engine to misfire when the other magneto is switched off.
391 Which of the following statements concerning Bernoulli theory, is correct?
O Ptot = Pstat + Pdyn
O Pitot = Pdyn - Pstat
O Pdyn = Ptot - Pitot
O Pitot =Ptot/ Pdyn.
392 Refering to Pittot, when entering ground effect, is likely to?
O Increase position errors.
O Not to be affected.
O Decrease pitot pressure but increase static pressure.
O Decrease position errors.
393 (Fig5.) If the static tube and drains become blocked?
O The ASI will under or over indicate depending on altitude.
O The ASI will under indicate;
O The ASI will over indicate.
O The ASI will be deflected full scale.
394 (Fig.7) If the static tube and drains become blocked?
O The altimeter will under or over indicate depending on altitude.
O The altimeter will under indicate.
O The altimeter will indicate full scale deflection.
O The altimeter will over indicate.
395 (Fig.6) If the static vents in an un-pressurised light aircraft become blocked?
O Breaking the front glass will enable the altimeter to function.
O Breaking or opening the windows will enable the ASI to function.
O Breaking or opening the windows will enable the altimeter to function.
O Breaking the front glass will trigger the needle to fluctuate.
396 (Fig.6) If the static source becomes blocked in a descent the ASI will.... indicate, the VSI will..............indicate and the altimeter will............indicate?
O Over under over.
O Under under under.
O Under over over.
O Over under under
397 (Fig.6) A blocked pitot probe will affect?
O ASI.
O VSI.
O Altimeter.
O All of the above instruments.
398 (Fig.6) A blocked static vent will affect?
O All of the above instruments..
399 What is density altitude?
O Pressure altitude corrected for ambient temperature.
O True altitude corrected for non std. conditions.
O Pressure altitude corrected for density changes.
O True altitude corrected for density changes.
400 What will happen to altimeter indication if an aircraft in level flight enters in a cold Front mass?
O Over indication.
O Under indication.
O No change.
O Is usually blocked by ice accumulations.
