PISTON – Air – DGCA Question Bank For Politics

#1. What is the only force stroke in a piston engine?

Induction.

Compression.

Power.

Exhaust.

#2. The four stroke working cycle is?

Induction, compression, power, exhaust.

compression, induction, power, exhaust.

Power, Induction, compression, exhaust.

Exhaust, Induction, compression, power.

#3. Compression ratio is?

Total volume/ swept volume.

Swept volume/ total volume.

Swept volume/ clearance volume.

Total volume/ clearance volume.

#4. After the engine has started the impulse coupling is held out of engagement by?

A strong springs.

Several weak springs.

Centrifugal force.

A slipping clutch.

#5. When climbing with a normally aspirated engine at constant throttle setting and full rich mixture?

Power increases due to improved volumetric efficiency.

Power remains constant.

Cylinder head temperature increases.

Cylinder head temperature decreases.

#6. When climbing with a turbocharged engine at constant throttle setting and full rich mixture?

Power increases due to improved volumetric efficiency.

Power remains constant.

Cylinder head temperature increases.

Cylinder head temperature decreases.

#7. When climbing with an internally supercharged engine at constant throttle lever setting and full rich mixture?

Power increases due to improved volumetric efficiency.

Power remains constant.

Cylinder head temperature remains constant.

Cylinder head temperature decreases.

#8. When climbing with a turbocharged engine at constant throttle setting and full rich mixture?

Power increases due to improved volumetric efficiency.

Power remains constant.

Power decreases due to degraded volumetric efficiency.

Cylinder head temperature decreases.

#9. If the waste-gate of a turbocharged engine seizes in the descent?

Power will decrease.

Power will increase.

Power will remain constant.

Cylinder head temperature will decrease.

#10. The turbine and turbocharger compressor?

Connected through a slipping clutch.

On a common shaft.

Connected by bevel gears.

Connected by an impulse coupling.

#11. A turbocharger is lubricated by?

Scavenge oil.

The constant speed propeller oil system.

The engine oil system.

A dedicated oil system.

#12. To switch off a magneto.

The secondary circuit is earthed.

The primary circuit is earthed.

The primary coil is open circuit.

The distributor is connected to the secondary circuit.

#13. A turbocharger is?

Driven by the engine crankshaft.

Driven by a reduction gearbox.

Driven by exhaust gasses.

Driven by induction airflow.

#14. Opening the waste-gate?

Starts the turbocharger.

Stops the turbocharger.

Accelerates the turbocharger.

Decelerates the turbocharger.

#15. An impulse coupling?

Increase battery voltage to the starter motor.

Boosts the secondary voltage.

Boosts the primary voltage to the magneto.

Increases the rotation rate of the magneto.

#16. A cylinder head temperature gauge measures the temperature of the?

Coldest cylinder.

All cylinders.

Hottest cylinder.

The exhaust gasses.

#17. If engine oil pressure is slightly high when starting on a very cold day?

Shut down immediately, the filter is probably blocked.

Increase RPM to maximum to clear the system.

The oil needs to be changed.

It is normal provided it decreases as oil temperature increases.

#18. Power available changes with increasing altitude because?

Increasing exhaust back pressure and increasing density.

Increasing exhaust back pressure and decreasing density.

Decreasing exhaust back pressure and decreasing density.

Decreasing exhaust back pressure and increasing density.

#19. The choke tube in a carburettor?

Increase static pressure to ensure fuel and air mix well.

Decreases static pressure to draw in fuel.

Decreases static pressure to evaporate fuel.

Decreases static pressure to draw in fuel and increase temperature to evaporate fuel.

#20. The chemically correct mixture for a piston engine is?

15 cc of air to 1 cc of fuel.

15 cc of fuel to 1 cc of air.

15 Kg of fuel to 1 Kg of air.

15 Kg of air to 1 Kg of fuel.

#21. The greatest advantage of a turbocharger is that it?

Increase power in a climb.

Uses energy that would otherwise be wasted.

Improves volumetric efficiency.

Increases high altitude performance.

#22. In a turbocharged aircraft?

Power increases in the climb and service ceiling decreases.

Power increases in the climb and service ceiling increases.

Power decreases in the climb and service ceiling decreases.

Power decreases in the climb and service ceiling increases.

#23. In an internally supercharged aircraft?

Power increases in the climb and service ceiling decreases.

Power increases in the climb and service ceiling increases.

Power decreases in the climb and service ceiling decreases.

Power decreases in the climb and service ceiling increases.

#24. With an air value of 1 and a richness of 1, a weak mixture will be made up of ...... of fuel?

1/8.

1/10.

1/15.

1/18.

#25. . Compression ratio is defined as?

Clearance volume divided by swept volume.

Swept volume divided by clearance volume.

Total volume divided by swept volume.

Total volume divided by clearance volume.

#26. If total volume is 2500 cc, swept volume is 2000 cc, what will the clearance volume be?

1500 cc.

500 cc.

5000 cc.

1.25 cc.

#27. A turbocharger uses a ?

Turbine and compressor on a common shaft.

Turbine and compressor connected by a step-up gear system.

Turbine driven by the engine crankshaft.

Compressor driven by the engine crankshaft.

#28. The turbocharger is located?

Downstream of the throttle.

Downstream of the choke tube.

Upstream of the throttle.

Upstream of the air filter.

#29. The supercharger is located?

Downstream of the throttle.

Upstream of the choke tube.

Upstream of the throttle.

Upstream of the air filter.

#30. In a supercharged aircraft the boost pressure is indicated on a?

MAP gauge.

CHT gauge.

RPM gauge.

Boost gauge.

#31. In a turbocharged aircraft the boost pressure is indicated on a?

MAP gauge.

CHT gauge.

RPM gauge.

BOOST gauge.

#32. If boost pressure is 1 psi, the MAP will be?

Ambient plus 10 psi.

Ambient minus 10 psi.

Approximately 25 psi.

It depends on throttle setting.

#33. BOOST pressure is?

The absolute in the manifold.

The pressure in the manifold minus that outside.

The pressure in the manifold minus that in the cylinders.

The pressure in the manifold minus ISA msl static pressure.

#34. In a piston engine the power lever is moved using indications on the...........gauge and the RPM lever is moved using indications on the ..........gauge?

Fuel flow, power.

Fuel flow, MAP.

MAP, RPM.

Torque, RPM.

#35. If the main jet of a carburettor became punctured it would cause?

Decreased RPM and richer mixture.

Decreased RPM and weaker mixture.

Increased RPM and weaker mixture.

Increased RPM and richer mixture.

#36. The safest way to increase power on a piston engine driving a constant speed propeller is to?

Increase mixture, then RPM then MAP.

Increase MAP, then RPM, then mixture.

Decrease mixture then increase map, then increase RPM.

Decrease mixture, then increase RPM then increase MAP.

#37. Total volume of a multi -cylinder piston engine is equal to?

Piston area x swept volume x number of cylinders.

Piston area x stroke x number of piston.

Swept volume plus total volume x number of cylinders.

Compression ratio x clearance volume x number of cylinders.

#38. If the ignition switch become disconnected from one magneto?

The engine will run roughly and at reduced power.

The engine will run normally but cannot be switched off.

The engine will not start.

There will be no effect because there are always two magnetos.

#39. If the ignition switch connected to one magneto becomes short circuited to earth?

The engine will run roughly and at reduced power.

The engine will run normally but cannot be switched off.

The engine will not start.

There will be no effect because there are always two magnetos.

#40. What part of a piston engine converts vertical motion into rotary motion?

Camshaft.

Rockers.

Crankshaft.

Pistons.

#41. If the earth line to a magneto breaks in flight?

The engine will stop.

The engine will run roughly.

The engine cannot be started.

The engine cannot be stopped using the ignition switches.

#42. The fuel : air mixture ratio is?

The mass of mixture in the cylinders.

The volume of mixture in the cylinders.

The mass of mixture in the carburettor.

The volume of mixture in the carburettor.

#43. Where is the oil pressure measured?

On the output side of the pressure pump.

On the input side of the pressure pump.

In the sump.

On the output side of the scavenge pump.

#44. If the ignition switch was faulty such that one of the magnetos was short circuited to earth?

The engine would stop when that magneto was switched off during the magneto drop check.

The engine would stop when the other magneto was switched off during the magneto drop check.

The problem would not be evident in a magneto drop check but the engine could not be switched off using the ignition switch.

The engine would not run.

#45. A magneto?

Provides an ignition source that depends upon DC electrical power.

Provides an ignition source that depends upon AC electrical power.

Generates its own DC power internally.

Generates its own AC power internally.

#46. A magneto is switched of by?

Opening the primary circuit.

Opening the secondary circuit.

Grounding the primary circuit.

Grounding the seconday circuit.

#47. Fuel octane rating is a measure of?

Its volatility.

Its energy content.

Its resistance to detonation.

Its resistance to accidental ignition.

#48. On which part of the four stroke cycle does the engine provide external power?

Induction.

Compression.

Expansion.

Exhaust.

#49. The relationship between compression ratio and octane rating is?

Increase increase.

Increase decrease.

Decrease unaffected.

Decrease increase.

#50. A CHT gauge measures?

The exhaust manifold temperature.

The hottest cylinder.

The coolest cylinder.

All of the cylinders.

#51. An EGt gauge measures?

The temperature inside the exhaust manifold.

The hottest cylinder.

The coolest cylinder.

All of the cylinders.

#52. . Turbocharger output pressure is?

Equal to MAP.

Less than MAP.

More than MAP.

Not related to MAP.

#53. A turbocharger is ..... the carburettor and compresses the .....?

Upstream mixture.

Upstream air only.

Downstream mixture.

Downstream air only.

#54. An internal supercharger is ........... the carburettor and compresses the........?

Upstream mixture.

Upstream air only.

Downstream mixture.

Downstream air only.

#55. An internal supercharger is .............. the carburettor and compresses the .......... ?

Upstream mixture.

Upstream air only.

Downstream mixture.

Downstream air only.

#56. A rich mixture is indicated by?

White smoke and red flames.

Blue smoke and white flames.

Black smoke and orange flames.

Black smoke and blue flames

#57. High oil pressure after start up is?

Not a problem provided it can be reduced by increasing RPM to maximum.

Not a problem but the engine should not be accelerated until it returns to normal.

Probably caused by icing of the oil filters, the engine should be shut down immediately.

Probably caused by dirty or sludgy oil. The engine should be shut down and the oil replaced.

#58. An LT booster coil?

Boosts the magneto primary current to assist in hand starting when the battery is flat.

Boosts the magneto primary current to keep the engine running if the battery becomes discharged in flight.

Boosts the magneto secondary current to give stronger sparks at low RPM.

Boost the magneto primary current but requires a good battery voltage to operate.

#59. An HT booster coil?

Boost the magneto secondary current to assist in hand starting when the battery is flat.

Boosts the magneto secondary current to keep the engine running if the battery becomes discharged in flight.

Boost the magneto primary current to give stronger sparks at low RPM.

Boost the magneto secondary current but requires a good battery voltage to operate.

#60. Power output of a supercharged engine ....... with increasing altitude, whilst that of a turbocharged engine .......... ?

Increase increase.

Increases decreases.

Decreases decreases.

Decreases increases.

#61. The main advantage of an impulse coupling compared to a booster coil is?

It is lighter and more simple.

It can be used when the battery is flat.

It improves high power performance.

It does not require an AC electrical supply.

#62. Carburettor icing is most likely to occur in the?

Choke tube at high power.

Choke tube at low power.

Air inlet.

Inlet ports.

#63. The crank system is made up of?

Pistons and controds.

Tappets, pistons and crank shaft.

Crank shaft, conrods, gudgeon pins and pistons.

Starter motors, ring gear and crank shaft.

#64. Spark plug fouling?

Is a build up of carbon deposits and is most likely during low power descents or idling.

Is a build up of lead deposits and is most likely during low power descents or idling.

Is a build up of carbon deposits and is most likely during high power descents or idling.

Is a build up of carbon deposits and is most likely when the mixture is lean and the engine hot.

#65. In a normally aspirated engine climbing at constant RPM the MAP will?

Remain constant.

Increase

Decrease.

It depents upon propeller type.

#66. In a turbocharged engine climbing at constant power settings the CHT will?

Remain constant.

Increase.

Decrease.

It depends upon propeller type.

#67. The power output of a turbocharged engine climbing at constant power setting?

Increases up to full throttle altitude then decreases.

Increases up to critical altitude then decreases.

Decreases up to full throttle altitude, then decreases.

Decreases up to critical altitude, then decreases.more quickly.

#68. The power output of an internally supercharged engine climbing at constant power setting?

Increases up to full throttle altitude then decreases.

Increases up to critical altitude then decreases.

Decreases up to full throttle altitude then increases.

Decreases up to critical altitude, then decreases more quickly.

#69. An impulse coupling assists starting by?

Boosting the LT voltage supplied to the magneto.

Boosting spark energy by increasing the magneto RPM.

Providing battery voltage to the LT coils.

Providing battery voltage to the HT coils.

#70. Burnt contact breaker points in a magneto indicates that?

Starting current is too high.

Fuel grade is too high.

Fuel mixture is too rich.

The capacitor is defective.

#71. If one magneto ignition switch becomes grounded?

RPM will increase.

RPM will decrease.

RPM will be unaffected but the engine will not stop when the magnetos are switched off.

RPM will decrease and the engine will stop if the other magneto is switched off.

#72. Setting an ignition switch to "ON"?

Shorts both primary circuits to earth.

Closes both primary circuits.

Opens both primary circuits.

Parallels the primary coils.

#73. When the distributor rotor comes close enough to the spark plug points.

When the contact breaker just closes.

When the contact breaker just open.

When the capacitor discharges.

#74. The capacitor in a magneto?

Increases the break down rate of the primary field and protects the contacts from arcing.

Protects the contacts from arcing by decreasing the break down rate of the primary field.

Protects the distributor contact breaker from arcing by controlling the spark rate.

Limits the maximum voltage in the primary circuit so that sparking across the contact breaker is prevented.

#75. magneto is essentially a?

Transformer rectifier with spark plugs.

AC generator with step down transformer.

AC generator with step up transformer.

DC generator with step up transformer.

#76. ignition switch?

Controls the magneto primary circuits.

Controls the magneto advance angle.

Controls the magneto secondary circuits.

Controls the magneto primary and secondary circuits.

#77. Selection of carburettor heat on an engine with no icing will?

Increase CHT, RPM and power output.

Decrease CHT, RPM and power output.

Increase CHT and RPM but decrease power output.

Increase CHT but decrease RPM and power output.

#78. Unof carburettor heat in high ambient temperatures and high power settings will?

Increase risk of dctonation.

Increase risk of spark plug fouling.

Increase risk of icing.

How no detrimental effects.

#79. If intercooler is used with a single stage supercharger it will be?

Of the fuel cooled type.

Between the impeller and the inlet ports.

Between the air inlet and the impeller.

Of the water cooled type.

#80. In a fuel injection system the fuel is injected?

Directly into the cylinders during the inlet stroke.

Directly into the cylinders during the compression stroke.

Directly into the inlet ports during the inlet stroke.

Directly into the inlet ports continuously.

#81. The fuel mixture in a piston engine when running at maximum power is?

Fully leaned.

Half leaned.

Half rich.

Fully rich.

#82. Enriching the fuel air mixture?

Increase power output.

Increase SFC.

Decrease SFC.

Decrease power output.

#83. The correct sequence for increasing power on a piston engine driving a constant speed propeller is?

Increase RPM, then throttle angle.

Increase throttle angle then RPM.

Increase mixture strength, RPM then throttle angle.

Increase throttle angle, RPM then mixture.

#84. If the oil supply to a turbocharger system fails in flight?

The waste gate will seize.

The waste gate will not be affected.

The waste gate will go fully open.

The waste gate will go fully closed.

#85. The compression ratio of a piston engine is?

Swept volume/ total volume.

Total volume/ clearance volume.

Clearance volume/ total volume.

Total volume/ swept volume.

#86. A turbocharger impeller is connected to Its turbine?

Through a step up gear train.

Through a step down gear train.

Directly.

Through a centrifugal clutch and waste gate.

#87. As a turbocharged aircraft (a) and an internally supercharged aircraft (b) climb at constant throttle lever setting?

The throttle in (a) will close while that in (b) opens.

The throttle in (a) will not move, but that in (b) will close.

The waste gate in (a) will close while the throttle in (b) opens.

The waste gates in both aircraft will close.

#88. As a turbocharged aircraft (a) and an internally supercharged aircraft(b) climb at constant throttle setting?

Power output in both aircraft will be constant.

Power output in both aircraft will increase.

Power output in both aircraft will decrease.

Power output In (a) will decrease while that in (b) increases.

#89. As a turbocharged aircraft (a) and an internally supercharged aircraft (b) climb at constant throttle lever setting? Volumetric efficiency will?

Remain constant in both aircraft.

Decrease in both aircraft.

Increase in both aircraft.

Decrease in (a) and increase in (b),

#90. The only force stroke in a piston engine is?

Induction.

Compression.

Power

Exhaust.

#91. CHT is normally measured by?

A temperature bulb in one of the exhaust ports.

A thermocouple on the coolest cylinder head.

A thermocouple on the hottest cylinder head.

A thermocouple on each cylinder head.

#92. Octane rating of the fuel required by a piston engine?

Is constant.

Increase with compression ratio.

Decreases with increasing compression ratio.

Increases with power setting.

#93. Valve overlap?

Is a sign worn vale seats.

Occurs between power and inlet strokes.

Occurs between exhaust and inlet strokes.

Occurs between compression and induction strokes.

#94. Which of the following statements if true of 100 LL AVGAS?

It contains more octane than 87 octane AVGAS.

It contains more lead than 87 octane AVGAS.

It cannot be used in normally aspirated engines.

It has a greater detonation resistance than 87 octane AVGAS.

#95. The lowest air pressure in a turbocharged induction manifold would be?

In the inlet.

Downstream of the air filter.

Downstream of the throttle valve.

Downstream of the impeller.

#96. The lowest air pressure in an internally supercharged induction manifold would be?

In the inlet.

Downstream of the throttle valve.

Downstream of the impeller.

Downstream of the airfilter.

#97. Which of the following statements is true of an internally supercharged engine?

The impeller compresses the fuel air mixture but power decrease with increasing altitude.

The impeller compresses the air but power increases with increasing altitude.

The impeller compresses the fuel air mixture but power output increases with increasing altitude.

The impeller compresses the air but power output decreases with increasing altitude.

#98. Which of the following statements is true of a turbocharged engine?

The impeller compresses the fuel air mixture but power decrease with increasing altitude.

The impeller compresses the air but power increases with increasing altitude.

The impeller compresses the fuel air mixture but power output increases with increasing altitude.

The impeller compresses the air but power output decreases with increasing altitude.

#99. Which of the following conditions are possible for a four cylinder piston engine, if its 1342? Cylinder1 Cylinder2 Cylinder3 Cylinder4

Induction Compression Power Exhaust.

Induction Compression Exhaust Power.

Induction Exhaust Compression Power.

Compression Exhaust Induction Power.

#100. If a turbocharged engine with a critical altitude of 15000 ft, has a rated boost of 10 psi. What will be its MAP after climbing from msl, for 2 minutes, at 2000 fpm using rated power?

5"Hg.

10"Hg.

25"Hg.

35"Hg.

#101. Boost pressure is?

The amount by which MAP exceeds ambient pressure.

The amount by which MAP exceeds inlet pressure.

The amount by which MAP exceeds ISA msl pressure.

The amount by which turbochager outlet pressure exceeds turbocharger inlet pressure.

#102. If total volume is 2500 cc, swept volume is 2000 cc, what will the compression ratio be?

1.25:1.

2.5:1.

5:1.

25:1.

Dgca Question Bank For Pilots

Results

#1. What is the only force stroke in a piston engine?

#2. The four stroke working cycle is?

#3. Compression ratio is?

#4. After the engine has started the impulse coupling is held out of engagement by?

#5. When climbing with a normally aspirated engine at constant throttle setting and full rich mixture?

#6. When climbing with a turbocharged engine at constant throttle setting and full rich mixture?

#7. When climbing with an internally supercharged engine at constant throttle lever setting and full rich mixture?

#8. When climbing with a turbocharged engine at constant throttle setting and full rich mixture?

#9. If the waste-gate of a turbocharged engine seizes in the descent?

#10. The turbine and turbocharger compressor?

#11. A turbocharger is lubricated by?

#12. To switch off a magneto.

#13. A turbocharger is?

#14. Opening the waste-gate?

#15. An impulse coupling?

#16. A cylinder head temperature gauge measures the temperature of the?

#17. If engine oil pressure is slightly high when starting on a very cold day?

#18. Power available changes with increasing altitude because?

#19. The choke tube in a carburettor?

#20. The chemically correct mixture for a piston engine is?

#21. The greatest advantage of a turbocharger is that it?

#22. In a turbocharged aircraft?

#23. In an internally supercharged aircraft?

#24. With an air value of 1 and a richness of 1, a weak mixture will be made up of ...... of fuel?

#25. . Compression ratio is defined as?

#26. If total volume is 2500 cc, swept volume is 2000 cc, what will the clearance volume be?

#27. A turbocharger uses a ?

#28. The turbocharger is located?

#29. The supercharger is located?

#30. In a supercharged aircraft the boost pressure is indicated on a?

#31. In a turbocharged aircraft the boost pressure is indicated on a?

#32. If boost pressure is 1 psi, the MAP will be?

#33. BOOST pressure is?

#34. In a piston engine the power lever is moved using indications on the...........gauge and the RPM lever is moved using indications on the ..........gauge?

#35. If the main jet of a carburettor became punctured it would cause?

#36. The safest way to increase power on a piston engine driving a constant speed propeller is to?

#37. Total volume of a multi -cylinder piston engine is equal to?

#38. If the ignition switch become disconnected from one magneto?

#39. If the ignition switch connected to one magneto becomes short circuited to earth?

#40. What part of a piston engine converts vertical motion into rotary motion?

#41. If the earth line to a magneto breaks in flight?

#42. The fuel : air mixture ratio is?

#43. Where is the oil pressure measured?

#44. If the ignition switch was faulty such that one of the magnetos was short circuited to earth?

#45. A magneto?

#46. A magneto is switched of by?

#47. Fuel octane rating is a measure of?

#48. On which part of the four stroke cycle does the engine provide external power?

#49. The relationship between compression ratio and octane rating is?

#50. A CHT gauge measures?

#51. An EGt gauge measures?

#52. . Turbocharger output pressure is?

#53. A turbocharger is ..... the carburettor and compresses the .....?

#54. An internal supercharger is ........... the carburettor and compresses the........?

#55. An internal supercharger is .............. the carburettor and compresses the .......... ?

#56. A rich mixture is indicated by?

#57. High oil pressure after start up is?

#58. An LT booster coil?

#59. An HT booster coil?

#60. Power output of a supercharged engine ....... with increasing altitude, whilst that of a turbocharged engine .......... ?

#61. The main advantage of an impulse coupling compared to a booster coil is?

#62. Carburettor icing is most likely to occur in the?

#63. The crank system is made up of?

#64. Spark plug fouling?

#65. In a normally aspirated engine climbing at constant RPM the MAP will?

#66. In a turbocharged engine climbing at constant power settings the CHT will?

#67. The power output of a turbocharged engine climbing at constant power setting?

#68. The power output of an internally supercharged engine climbing at constant power setting?

#69. An impulse coupling assists starting by?

#70. Burnt contact breaker points in a magneto indicates that?

#71. If one magneto ignition switch becomes grounded?

#72. Setting an ignition switch to "ON"?

#73. When the distributor rotor comes close enough to the spark plug points.

#74. The capacitor in a magneto?

#75. magneto is essentially a?

#76. ignition switch?

#77. Selection of carburettor heat on an engine with no icing will?

#78. Unof carburettor heat in high ambient temperatures and high power settings will?