WorldSkills UK Aeronautical Engineering Avionic Pre-Competition Theory Test
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WorldSkills UK
Aeronautical Engineering
Avionic
Pre-Competition
Theory Test
Page 1 of 7
File: WSUK Aircraft Maintenance Quiz (Avionic) V2.doc
Date: 06/02/141.
With regards to aviation fuel, what do the letters FSII mean?
A. Fuel system icing inhibitor.
B. Fuel system icing indicator.
C. Fuel storage icing inhibitor.
D. Fuel storage icing indicator.
2.
What item of test equipment is used to check that all parts of an airframe are
at the same electrical potential?
A. Digital Multimeter.
B. Oscilloscope.
C. Bonding tester.
D. Insulation resistance tester.
3.
Two resistors of equal value are connected in parallel across a voltage
source. What is the value of the total circuit resistance compared to the
value of one resistor?
A. Double.
B. Half.
C. Equal.
D. Reciprocal.
4.
To produce a generated voltage, conductors are moved through a magnetic
field. How is the resultant electromotive force said to have been produced?
A. Statically.
B. Differentially.
C. Dynamically.
D. Inversely.
Page 2 of 7
File: WSUK Aircraft Maintenance Quiz (Avionic) V2.doc
Date: 06/02/145.
A transformer is used to change an AC voltage level. What factor determines
the amount of change?
A. The changing magnetic field around the coil.
B. The number of turns on the secondary coil.
C. The amount of turns on the primary coil.
D. The ratio of turns between the secondary and primary coils.
6.
In an aircraft power generation and distribution system, what unit is used to
produce dc from the ac output?
A. An ac/dc interface unit.
B. A transformer/rectifier unit.
C. A ground test inverter.
D. A dc static inverter.
7.
Which law states that ‘If a conductor is placed within a changing magnetic
field, then an electromotive force is induced into that conductor.’
A. Ohm’s Law.
B. Newton’s Law.
C. Henry’s Law.
D. Faraday’s Law.
8.
What is gyro rigidity?
A. The property to maintain a fixed axis in space unless acted on by an
external force.
B. The ability to maintain a fixed axis in space when acted on by an
external force.
C. When acted on by an external force its gyro will move not in the
direction of its force but 90° ahead in its direction of rotation.
D. The spin axis will align with the earth’s magnetic field unless acted on
by an external force.
Page 3 of 7
File: WSUK Aircraft Maintenance Quiz (Avionic) V2.doc
Date: 06/02/149.
To measure the current flow in a circuit consisting of a voltage source and a
load, it is necessary to use an ammeter. In what configuration should the
ammeter be connected?
A. In parallel to the load.
B. In series with the load.
C. In place of load.
D. In parallel to the load with a calibrated shunt resistor.
10.
On which principle of electromagnetic induction does a rotating machine
operate?
A. Dynamic induction.
B. Self induction.
C. Mutual induction.
D. Static induction.
11.
When an aircraft's main power supply is 28V dc, what item of equipment is
required to enable a 200/115V ac 3 phase 400Hz load to be supplied?
A. Alternator.
B. Transformer.
C. TRU.
D. Inverter.
12.
The exhaust gas temperature of an aircraft is normally measured using
thermocouples. On what electrical principle do thermocouples operate?
A. The effect of frictional heat due to high velocity of exhaust gases.
B. When two dissimilar metal junctions are heated, a small emf is
produced.
C. Variations in rate of expansion of two metal rods will operate a diaphragm
actuated switch.
D. When two similar metal junctions are heated, a small emf is produced.
Page 4 of 7
File: WSUK Aircraft Maintenance Quiz (Avionic) V2.doc
Date: 06/02/1413.
Which instrument uses dynamic pressure?
A. Rate of Climb and Descent Indicator.
B. Air Speed Indicator.
C. Attitude Indicator.
D. Altimeter.
14.
Which of the following is the best definition of a
conductor?
A. A material which produces a current.
B A material which prevents current from flowing.
C. A material which allows current to flow.
D. A material which produces voltage.
15.
When in operation, an inspection lamp fed from a 28V dc supply draws a current of
4A. What is the value of the power used by the lamp?
A. 32 W.
B. 112 W.
C. 0.14 W.
D. 7 W.
16.
Which of the following methods should be used to lock a turnbuckle?
A. A locking plate.
B. Locking wire.
C. Tab washers.
D. Circlip.
Page 5 of 7
File: WSUK Aircraft Maintenance Quiz (Avionic) V2.doc
Date: 06/02/1417.
How does a circuit breaker work?
A. A current causes heat which operates a bi-metallic contact.
B. A current produces a magnetic field which trips a contact.
C. A voltage drop occurs which disables the electrical contact.
D. It short circuits any fault.
18.
Many threaded fasteners or connectors require torque loading during fitting or
assembly. What is meant by torque loading?
A. Applying a minimum safe working load to a fastener or connector to
ensure it remains secure.
B. Applying a pre-determined amount of force to prevent a fastener or
connector becoming loose when subjected to vibration.
C. Applying the correct tension to fasteners or connectors without the
danger of overtightening.
D. Applying the maximum strength required to ensure a fastener or
connector is correctly made.
19.
What would be the consequence of inserting a larger current rated
(incorrect) fuse in a circuit?
A. It would cause a larger current to flow.
B. It would cause circuit damage if a fault occurs.
C. It would alter the resistance, and so operation of the circuit.
D. It would have no effect.
Page 6 of 7
File: WSUK Aircraft Maintenance Quiz (Avionic) V2.doc
Date: 06/02/1420.
Which of the following is the correct definition of Ohm's law?
A. The current in a circuit is directly proportional to the applied voltage and
inversely proportional to the circuit resistance at a given temperature.
B. The voltage in a circuit is directly proportional to the applied current and
inversely proportional to the circuit resistance at a given temperature.
C. The resistance in a circuit is inversely proportional to the voltage applied and
proportional to the temperature.
D. The current in a circuit is directly proportional to the applied voltage and the
circuit resistance at a given temperature.
For the full set of answers, please contact: WSUKEng@semta.org.uk
Page 7 of 7
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