avionica

The letter symbol used to represent electrical current is. I. E. R.

The letter symbol used to represent electrical pressure is. E. R. I.

The letter symbol used to represent electrical resistance is. R. I. E.

"The point in an aircraft electrical system from which the various circuits get their power is called a". bus. an electrical load. contactor.

"Three things that happen in an electrical circuit when current flows through it are:". heat is produced in the conductor. "magnetic field surrounds the conductor". voltage is dropped across the load.

"If a 4-gage copper wire routed in free air is to be replaced with an aluminum wire that is to carry the same amount of current, a     -gage aluminum wire will have to be used.". 2. 4. 6. 8.

"The smallest size aluminum wire recommended for use in aircraft electrical systems is     -gage.". 4. 6. 8. 10.

"When selecting the size wire to use in an aircraft electrical system, two things must be considered. These are:". current-carrying capability. allowable voltage drop. wire length. all of the above.

The longer line in the symbol for a battery indicates the      terminal. positive. negative.

"Electrons flowing in an electrical circuit flow in the      direction as the arrowheads in a semiconductor diode symbol.". opposite. same. Nearby.

"Conventional current in an electrical circuit is assumed to flow in the      direction as the arrowheads in a semiconductor diode symbol.". same. opposite. Nearby.

"Three things that must be included in all complete electrical circuits are:". a source of electrical energy. an electrical load. "conductors to join the source with the load".

If the bar in the symbol for a semiconductor diode is connected to the negative terminal of a battery, the diode is      biased. forward. afther.

A forward-biased diode acts as a/an      switch. closed. open.

"The voltage drop across a forward-biased silicon diode is approximately  volt. 0,7. 0,6. 0,9.

"The voltage drop across a forward-biased silicon diode      vary with the current flowing through it.". does not. does.

A semiconductor device that can be used as a voltage sensor is a/an. zener diode. bus.

A zener diode used as a voltage regulator is      biased. reverse. Nearby.

An electrical relay has a      core. fixed. Movable. Electromagnetic.

A solenoid has a      core. Unbiased. movable. Forward. Reverse.

"When the base of an NPN transistor has the same polarity as the collector, the transistor acts as a/an      switch.". closed. Open.

"When a transistor is connected in an amplifier circuit, bringing its base polarity closer to that of the collector      ". increases. decreases.

"A semiconductor device that acts in the same way as a holding relay is a/an". silicon controlled rectifier. Thyristor. Triac.

In a complete series circuit, the sum of the voltage drops is the same as the applied voltage. This sentence is (true or false). true. False.

"The voltage drop across an open switch in a series circuit is (zero volts or battery voltage).". battery voltage. zero volts.

"The voltage drop across a closed switch in a series circuit is (zero volts or battery voltage).". zero volts. battery voltage.

"The amount of current that flows through each path of a parallel circuit is determined by the      of the path.". resistance. battery voltage.

"The voltage across each path of a parallel circuit is equal to the       voltage.". battery. resistance.

"The reference from which all voltage is measured in an aircraft electrical system is called the     .". ground. negative.

"Return current from devices installed in an aircraft electrical system flows back to the battery through the     .". aircraft structure. Negative bus. Ground.

"The battery terminal that is normally grounded is the      (negative or positive) terminal.". negative. positive.

"Circuit breakers and fuses are installed in a circuit primarily to protect the (wiring or circuit devices).". wiring. circuit devices.

The one circuit in an aircraft electrical system that is not required to be protected by a circuit protection device is the main      circuit. starter. Battery.

"Circuit breakers used in aircraft electrical systems must be of the       type.". trip-free. trip-free.

"A trip-free circuit breaker (can or cannot) be manually held closed in the presence of a fault.". cannot. cannot.

"Automatic reset circuit breakers (are or are not) approved for use in aircraft electrical circuits.". are. are not.

"An electrical circuit that has 12 fuses rated at 30 amps is required to carry at least      30-amp fuses as spares.". 6. 8. 10.

"Current that is induced into a conductor by a changing current in another nearby conductor is called      current.". Mutual. induced.

"The amount of current that is induced by a changing magnetic field is determined by the      of change of the magnetic field.". rate. Frequency. Magnitude.

"The direction of flow of induced current is      that of the current that caused it.". opposite. positive. negative.

"The diode that is placed across the coil of a battery contactor is       biased by the battery. (forward or reverse)". reverse. Forward. Neutral.

Refer to Figure . The device that prevents the GPU from overcharging a fully charged battery is. resistor R. switch. the fuse.

Refer to Figure . The device that prevents the GPU from being connected to the aircraft electrical system if its polarity is incorrect is. diode Dy. switch. the fuse.

Refer to Figure. The device that prevents the GPU from being connected to the aircraft electrical system if there is a short in the battery is. the fuse. switch. diode.