Test
ELECTRIC
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Preguntas del test (28)
1If a generator is equipped with a vibrator-type voltage regulator, the actual time the voltage regulator points remain open
- Ais controlled by the reverse -current cut-out relay point clearance
- Bis increased when the external load is greater than the generator output
- Cdepends on the load carried by the generator
2CSD driven generators are usually cooled by
- Aoil spray
- Ban integral fan
- Cboth ram air and an integral fan
3What protection to wires and cables does conduit provide when used in aircraft installations?
- AMechanical
- BElectromagnetic
- CStructural
4A CSD unit drives a generator through the use of
- Aan infinitely variable mechanical gearing system.
- BA CSD unit drives a generator through the use of
- Ca variable hydraulic pump and hydraulic motor
5The overvoltage control automatically protects the generator system when excessive voltage is present by
- Abreaking a circuit to the trip coil of the field control relay
- Bopening the shunt field circuit
6The inductor-type inverter output voltage is controlled by the
- Anumber of poles and the speed of the motor.
- Bdc stator field current.
7The pin section of an AN/MS connector is normally installed on
- Athe power supply side of a circuit
- Bthe ground side of a circuit
8If it is necessary to use an electrical connector where it may be exposed to moisture, the mechanic should
- Acoat the connector with grease
- Buse a special moisture-proof type
9What is an important factor in selecting aircraft fuses?
- AThe current exceeds a predetermined value
- BCapacity matches the needs of the circuit
10Electric wire terminals for most aircraft applications must be what type?
- ARing
- BSlotted
11How should a voltmeter be connected?
- AIn series with the load.
- BIn parallel with the load
12The most common method of regulating the voltage output of a compound dc generator is to vary the
- Atotal effective field strength by changing the reluctance of the magnetic circuit
- Bcurrent flowing through the shunt field coils.
13Which type of dc generator is not used as an airplane generator?
- AExternally grounded.
- BSeries wound.
14Grounding is electrically connecting a conductive object to the primary structure. One purpose of grounding is to
- Aallow static charge accumulation
- Bprevent development of radio frequency potentials
15The method most often used in overcoming the effect of armature reaction is through the use of
- Ashades poles
- Binterpoles
16How does the magnetic brake used to stop rotation of an electric motor armature operate?
- AA friction brake is applied by a magnet and released by a spring.
- BA friction brake is applied by a spring and released by a magnet
17How can the direction of rotation of a dc electric motor be changed?
- AReverse the electrical connections to either the field or armature windings
- BInterchange the wires which connect the motor to the external power source
18The type of electric wire terminals used for most aircraft applications, in addition to providing good current carrying capabilities, are designed primarily
- Afor permanent connection to the circuit
- Bto prevent circuit failure due to terminal disconnection.
19The strength of the core of an electromagnet depends upon the material from which it is constructed and which of the following?
- AThe size (cross section) and the number of turns of wire in the coil and the applied voltage.
- BThe number of turns of wire in the coil and the amount of current (amperes) passing through the coil.
20Electric wiring installed in aircraft without special enclosing means (open wiring) offers the advantages of ease of installation, simple maintenance, and reduced weight. When bundling open wiring, the bundles should
- Abe limited to a minimum bend radius of five times the bundle diameter to avoid excessive stresses on the cable insulation.
- Bbe limited as to the number of cables to minimize damage from a single electrical fault.
21To help minimize radio interference a capacitor will largely eliminate and provide a steady direct current if the capacitor is connected to the generator in
- Aparallel
- Bseries
22The navigation lights of some aircraft consist of a single circuit controlled by a single switch which has an ON position and an OFF position, with no additional positions possible. This switch is referred to as a
- Asingle-pole, single-throw (SPST), two-position switch
- Bdouble-pole, single-throw (DPST), two-position switch.
23An ammeter in a battery charging system is for the purpose of indicating the
- Atotal amperes being used in the airplane.
- Brate of current used to charge the battery.
24The voltage output of an alternator may be regulated by controlling the
- Aspeed of the alternator
- Bvoltage output of the dc exciter.
25Which motor would be most likely to have an armature brake?
- AStarter motor.
- BLanding light retraction motor.
26The poles of a generator are laminated to
- Areduce flux losses.
- Breduce eddy current losses.
27When dc generators are operated in parallel to supply power for a single load, their controls include an equalizer circuit to assure that all generators share the load equally. The equalizer circuit operates by
- Aincreasing the output of the low generator to equal the output of the high generator.
- Bincreasing the output of the low generator and decreasing the output of the high generator until they are equal.
28Which of the following must be accomplished when installing an anticollision light
- AConnect the anticollision light to the aircraft position light switch.
- B.Install a switch independent of the position light switch
Información
- Descripción
- Test sobre ELECTRIC, creado por Javier Muñoz el 07/04/2015.
- Autor
- Javier Muñoz
- Idioma
- Español
- Visitas
- 1
- Valoración
- Aún sin valoraciones Valora este test