ASA General: Fudementals of Electricity and electronics

What kind of circuit protection device can be reset?

Circuit breaker

What factors strengthen a coil inductor?

Adding coils close together

Through which material will magnetic lines of force pass the most readily?

Iron

The working voltage of a capacitor in an AC circuit should be?

at least 50 percent greater than the highest applied voltage

When different rated capacitors are connected in series in a circuit, the total capacitance is?

less than the capacitance of the lowest rated capacitor

Capacitors are sometimes used in DC circuits to

smooth out slight pulsations in current/voltage

The amount of electricity a capacitor can store is directly proportional to the?

plate area and inversely proportional to the distance between the plates

What does the letter Q represent when measuring electrical charge

coulomb

An increase in which of the following factors will cause an increase in the inductive reactance of a circuit?

Inductance and frequency

When different rated capacitors are connected in parallel in a circuit, the total capacitance is?

equal to the sum of all the capacitances

When inductors are connected in series in a circuit, the total inductance(magnetic fields of each inductor do not affect each other) is?

Equal to the sum of the individual inductances

When more than two inductors of a different inductances are connected in parallel in a circuit, the total inductance is ?

less than the inductance of the lowest rated inductor

transfer of electric energy from one circuit to another without the aid of electrical connections is called ?

Induction

The term that describes the combined resistance forces in an AC circuit is ?

impedance

What is the opposition to the flow of AC produced by an electromagnetic field with generated back voltage called

Inductive reactance

The opposition offered by a coil to the flow of alternating current is called?

Inductive reactance

In an AC circuit, the effective voltage is?

less than the max instantaneous voltage

Unless otherwise specified, any values given for current or voltage in an AC circuit are assumed to be ?

Effective value

When referencing resistance in a parallel DC circuit, which of the following statements are true?

The total current is equal to the sum of the currents through the individual branches of the circuit

Convert farads to microfarads by

multiply farads by 10 to the power of 6

Convert farads to picofarads by?

multiplying farads by 10 to the power of 12

how does an aviation mechanic convert picofarads to microfarads ?

Move the decimal 6 positions left

Which requires the most electrical power during operation?

Two lights requiring 3 amperes each in a 24 volt parallel system

The correct way to connect a test voltmeter in a circuit is?

in parallel with a unit

What will a voltmeter read if properly connected across a closed switch in a circuit with electrical power on ?

zero voltage

Which term means .001 ampere

milliampere

.002 kV equals?

2.0 volts

What is the basic unit of electrical quantity?

coulomb

The potential difference between two conductors which are insulated from each other is measured in ?

Volts

A 24 volt source is required to furnish 48 watts to a parallel circuit consisting of four resistors of equal value. What is the voltage drop across each resistor

24 volts

The voltage drop in a circuit of known resistance is dependent on?

the amperage of the circuit

Which effect does not apply to the movement of electrons flowing in a conductor ?

Static energy

What happens to the current in the circuit if all the resistors double in value?

The current is cut in half

In a parallel circuit with three 6 ohms resistors across a 12 volt battery, what is the total current value in the circuit?

6 amps

Which is correct in reference to electrical resistance ?

If one of three bulbs in a parallel lighting circuit is removed, the total resistance of the circuit will become greater

Which of these will cause the resistance of a conductor to decrease?

Decrease the length or increase the cross sectional area

When calculating power in a reactive or inductive AC circuit, the true power is

Less than the apparent power

What unit is used to express electrical power?

Watt

What happens to the current in a voltage step up transformer with a ratio of 1 to 4 ?

the current is stepped down by a 1 to 4 ratio

A cabin entry light of 10 watts and a dome light of 20 watts are connected in parallel to a 30 volt source. If the voltage across the 10 watt light measured. It will be?

Equal to the voltage across the 20 watt light

In a parallel circuit with four 6 ohms resistors across a 24 volt battery, what is the total voltage across resistor three in the circuit ?

24 volts

Which is correct concerning a parallel circuit?

Total resistance will be smaller than the smallest resistor

If each cell, connected in series, equals 2 volts, how would a 12 cell lead acid battery be rated?

24 volts

If electrolyte from a lead battery is spilled in the battery compartment, which procedure should be followed ?

apply sodium bicarbonate solutions to the effected area followed by water rinse

Which statement regarding the hydrometer reading of a lead acid storage battery electrolyte is true?

The hydrometer reading does not require a temperature correction if the electrolyte temperature is 80 F

a fully charged lead acid battery will not freeze until extremely low temperatures are reached because ?

Most of the acid is in the solution

What determines the amount of current which will flow through a battery while it is being charged by a constant voltage source ?

The state of charge of the battery

Which of the following statements is false regarding the charging of several aircraft batteries together?

Batteries of the same voltage and same ampere hour capacity must be connected in series with each other across the charger and charged using the constant current method

The method used to rapidly charge a nickel cadmium battery utilizes ?

constant voltage and varying current

The purpose of providing a space underneath the plates in a lead acid batters cell container is to?

Prevent sediment buildup from contacting the plates and causing a short circuit

Which condition is an indication of improperly torqued cell link connections of a nickel cadmium battery?

Heat or burn marks on the hardware

The presence of any small amount of potassium carbonate deposits on the top of nickel cadmium battery cells in service is an indication of

normal operations

What is the likely result, if any, of servicing and charging nickel cadmium and lead acid batteries together in the same service area?

Contamination of both types of batteries would occur

Which of the following best describes the operating principal in a nickel cadmium battery installed in an aircraft ?

When positive plates slowly give up oxygen, which is regained by the negative plate, the battery is charging

The electrolyte of a nickel cadmium battery is the lowest when the battery is?

In a discharged condition

The end of charge voltage of a 19 cell nickel cadmium battery, measures while still on charge ?

depends on the temp and the method used for charging

During discharge, nickel cadmium batteries will show a lower liquid level than when at full charge because ?

the electrolyte becomes absorbed into the plates

How can the state of charged of a nickel cadmium battery be determined ?

By a measured discharge

What may result if water is added to a nickel cadmium battery when it is not fully charged?

Excessive spewing is likely to occur during the charging cycle

In a nickle cadmium batteries, a rise in cell temperature does what ?

causes a decrease in internal resistance

Which of the following best describes the contributing factors to thermal runaway in a nickel cadmium battery installed in an aircraft ?

Low internal resistance intensified by high cell temp and a high current discharge/charge rate in a constant potential (voltage) charging system

At what temperature is a battery charging adjustment necessary?

95 degrees F

When a charging current is applied to a nickel cadmium battery, the cell emit gas where?

towards the end of the charging cycle

The basis for transformers operation in the use of alternating current is mutual ?

inductance

A thermal switch, or thermal protector, as used in an electric motor, is designed to ?

open the circuit in order to allow cooling of the motor

Which of the following is commonly used as a rectifier in electrical circuits ?

Diodes

Diodes are used in electrical power supply circuits primarily as?

Rectifiers

In a PNP transistor application, the solid state device is turned on when the ?

base is negative with respect to the emitter

In an NPN transistor application, the solid state device is turned on when the ?

Base is positive with respect to the emitter

Typical application for zener diodes is as ?

Voltage regulators

Forward biasing of a solid state device will cause the device to ?

Conduct

Which of the following logic gates will provide an active high out only when all inputs are different?

NAND

Electrostatic fields are also known as ?

Dielectric fields

When referring to an electrical circuit diagram, what point is considered to be at zero voltage?

The ground reference

What is the purpose of the ground symbols used in electrical circuit diagrams?

To show that there is a return path for the current between the source of electrical energy and the load