Solutions Manual For Aircraft Performance An Engineering
Approach 1st Edition By Mohammad H. Sadraey
9781498776554 ALL Chapters .
1.Where electric cables must pass through holes in
bulkheads, formers, ribs, Firewalls, etc., the wires should be
protected from chafing by
a. wrapping with electrical tape.
b. using a suitable grommet.
c. wrapping with plastic. - ANSWER: using a suitable grommet.
Which motor would be most likely to have an armature
brake?
a. Starter motor.
b. Landing light retraction motor.
c. lnverter drive motor. - ANSWER: Landing light retraction motor.
What is the principal advantage of the series-wound dc
motor?
a. High starling torque.
b. Suitable for constant speed use.
c. Low starting torque. - ANSWER: High starling torque.
How can it be determined if a transformer winding has
some of its turns
shorted together?
a. Measure the input voltage with an ohmmeter.
b. The output voltage will be high.
c. The transformer will get hot in normal
operation. - ANSWER: The transformer will get hot in normal
operation.
If the reverse current cutout relay contact points fail to
open after the
generator output has dropped below battery potential,
current will flow
through the generator armature
a. in the normal direction and through the shunt
field opposite the normal direction.
b. and the shunt field opposite the normal direction.
c. opposite the normal direction and through the
shunt field in the normal direction. - ANSWER: opposite the normal direction and through the
shunt field in the normal direction.
What is the color and orientation of the position lights for
navigation on
civil airplanes?
a. Left side - green, right side - red, rear aft - white.
b. Left side - red, right side - green, rear aft -
white.
c. Left side - white, right side - green, rear aft - red. - ANSWER: Left side - red, right side - green, rear
aft -
white.
What is required when operating two aircraft ac
,generators in parallel?
a. Amperes and frequency must both be equal.
b. Frequency and voltage must both be equal.
c. Amperes and voltage must both be equal. - ANSWER: Frequency and voltage must both be equal.
What is the minimum bend radius for an electrical wire
bundle?
a. Ten times the outside diameter of the bundle.
b. Five times the outside diameter of the bundle.
c. Fifteen times the outside diameter of the bundle. - ANSWER: Ten times the outside diameter of the
bundle.
What is a cause of generator brush arcing?
a. Seating brushes with No. 000 sandpaper.
b. Carbon dust particles.
c. Low spring tension. - ANSWER: Low spring tension.
When handling a high voltage capacitor in an electrical
circuit, be sure it
a. has a full charge before removing it from the
circuit.
b. has at least a residual charge before removing it
from the circuit.
c. is fully discharged before removing it from the
circuit. - ANSWER: is fully discharged before removing it from the
circuit.
The nominal rating of electrical switches refers to
continuous
a. current rating with the contacts open.
b. voltage rating with the contacts closed.
c. current rating with the contacts closed. - ANSWER: current rating with the contacts closed.
What is normally used to bond noncontiguous stainless-
steel aircraft components?
a. Stainless steel jumpers.
b. Copper jumpers.
c. Aluminum jumpers. - ANSWER: Copper jumpers.
Grounding is electrically connecting a conductive object
to the primary
structure. One purpose of grounding is to
a. prevent current return paths.
b. allow static charge accumulation.
c. prevent development of radio frequency
potentials. - ANSWER: prevent development of radio frequency
potentials.
A battery-generator system provides direct current. On
installations requiring alternating current from the battery-
generator system, it is necessary to have
a. a transformer.
b. an inverter.
c. a variable resistor between the battery and
generator. - ANSWER: an inverter.
Which of the following must be accomplished when
, installing an anti-collision light?
a. Install a switch independent of the position
light switch.
b. Use shielded electrical cable to assure fail-safe
operation.
c. Connect the anticollision light to the aircraft
position light switch. - ANSWER: Install a switch independent of the position
light switch.
Which of the following copper electrical cable sizes
should be selected to replace a No. 6 aluminum electrical
cable?
a. No. 4.
b. No.6.
c. No.8. - ANSWER: No.6.
Major adjustments on equipment such as regulators,
contactors, and inverters are best accomplished outside the
airplane on test benches with necessary instruments and
equipment. Adjustment procedure should be as outlined by
a. the equipment manufacturer.
b. the FAA.
c. aircraft technical orders. - ANSWER: the equipment manufacturer.
Which of the following factors must be taken into
consideration when determining the wire size to use for an
aircraft installation?
1. Mechanical strength.
2. Allowable power loss.
3. Ease of installation.
4. Resistance of current return path through the aircraft
structure.
5. Permissible voltage drop.
6. Current carrying capability of the conductor.
7. Type of load (continuous or intermittent).
a. 2,5,6,7.
b. 1,2,4,5.
c. 2,4, 6,7. - ANSWER: 2,5,6,7.
Residual voltage is a result of magnetism in the
a. field windings.
b. field shoes.
c. armature. - ANSWER: field shoes.
Electric circuits are protected from overheating by
means of
a. thermocouples.
b. shunts.
c. fuses. - ANSWER: fuses.
What is the purpose of the selection of derated switches
for known continuous load current applications?
a. To calculate the voltage, drop across the circuit.
b. To prevent short circuits in the motor field
windings.
Approach 1st Edition By Mohammad H. Sadraey
9781498776554 ALL Chapters .
1.Where electric cables must pass through holes in
bulkheads, formers, ribs, Firewalls, etc., the wires should be
protected from chafing by
a. wrapping with electrical tape.
b. using a suitable grommet.
c. wrapping with plastic. - ANSWER: using a suitable grommet.
Which motor would be most likely to have an armature
brake?
a. Starter motor.
b. Landing light retraction motor.
c. lnverter drive motor. - ANSWER: Landing light retraction motor.
What is the principal advantage of the series-wound dc
motor?
a. High starling torque.
b. Suitable for constant speed use.
c. Low starting torque. - ANSWER: High starling torque.
How can it be determined if a transformer winding has
some of its turns
shorted together?
a. Measure the input voltage with an ohmmeter.
b. The output voltage will be high.
c. The transformer will get hot in normal
operation. - ANSWER: The transformer will get hot in normal
operation.
If the reverse current cutout relay contact points fail to
open after the
generator output has dropped below battery potential,
current will flow
through the generator armature
a. in the normal direction and through the shunt
field opposite the normal direction.
b. and the shunt field opposite the normal direction.
c. opposite the normal direction and through the
shunt field in the normal direction. - ANSWER: opposite the normal direction and through the
shunt field in the normal direction.
What is the color and orientation of the position lights for
navigation on
civil airplanes?
a. Left side - green, right side - red, rear aft - white.
b. Left side - red, right side - green, rear aft -
white.
c. Left side - white, right side - green, rear aft - red. - ANSWER: Left side - red, right side - green, rear
aft -
white.
What is required when operating two aircraft ac
,generators in parallel?
a. Amperes and frequency must both be equal.
b. Frequency and voltage must both be equal.
c. Amperes and voltage must both be equal. - ANSWER: Frequency and voltage must both be equal.
What is the minimum bend radius for an electrical wire
bundle?
a. Ten times the outside diameter of the bundle.
b. Five times the outside diameter of the bundle.
c. Fifteen times the outside diameter of the bundle. - ANSWER: Ten times the outside diameter of the
bundle.
What is a cause of generator brush arcing?
a. Seating brushes with No. 000 sandpaper.
b. Carbon dust particles.
c. Low spring tension. - ANSWER: Low spring tension.
When handling a high voltage capacitor in an electrical
circuit, be sure it
a. has a full charge before removing it from the
circuit.
b. has at least a residual charge before removing it
from the circuit.
c. is fully discharged before removing it from the
circuit. - ANSWER: is fully discharged before removing it from the
circuit.
The nominal rating of electrical switches refers to
continuous
a. current rating with the contacts open.
b. voltage rating with the contacts closed.
c. current rating with the contacts closed. - ANSWER: current rating with the contacts closed.
What is normally used to bond noncontiguous stainless-
steel aircraft components?
a. Stainless steel jumpers.
b. Copper jumpers.
c. Aluminum jumpers. - ANSWER: Copper jumpers.
Grounding is electrically connecting a conductive object
to the primary
structure. One purpose of grounding is to
a. prevent current return paths.
b. allow static charge accumulation.
c. prevent development of radio frequency
potentials. - ANSWER: prevent development of radio frequency
potentials.
A battery-generator system provides direct current. On
installations requiring alternating current from the battery-
generator system, it is necessary to have
a. a transformer.
b. an inverter.
c. a variable resistor between the battery and
generator. - ANSWER: an inverter.
Which of the following must be accomplished when
, installing an anti-collision light?
a. Install a switch independent of the position
light switch.
b. Use shielded electrical cable to assure fail-safe
operation.
c. Connect the anticollision light to the aircraft
position light switch. - ANSWER: Install a switch independent of the position
light switch.
Which of the following copper electrical cable sizes
should be selected to replace a No. 6 aluminum electrical
cable?
a. No. 4.
b. No.6.
c. No.8. - ANSWER: No.6.
Major adjustments on equipment such as regulators,
contactors, and inverters are best accomplished outside the
airplane on test benches with necessary instruments and
equipment. Adjustment procedure should be as outlined by
a. the equipment manufacturer.
b. the FAA.
c. aircraft technical orders. - ANSWER: the equipment manufacturer.
Which of the following factors must be taken into
consideration when determining the wire size to use for an
aircraft installation?
1. Mechanical strength.
2. Allowable power loss.
3. Ease of installation.
4. Resistance of current return path through the aircraft
structure.
5. Permissible voltage drop.
6. Current carrying capability of the conductor.
7. Type of load (continuous or intermittent).
a. 2,5,6,7.
b. 1,2,4,5.
c. 2,4, 6,7. - ANSWER: 2,5,6,7.
Residual voltage is a result of magnetism in the
a. field windings.
b. field shoes.
c. armature. - ANSWER: field shoes.
Electric circuits are protected from overheating by
means of
a. thermocouples.
b. shunts.
c. fuses. - ANSWER: fuses.
What is the purpose of the selection of derated switches
for known continuous load current applications?
a. To calculate the voltage, drop across the circuit.
b. To prevent short circuits in the motor field
windings.
