Fundamentals of Electricity and Electronics

Question 1

(Refer to figure 15) Wire 7 is used to

Answer 1

Close the PUSH-TO-TEST circuit.

Question 2

(Refer to figure 18) When the landing gear is up and the throttles are retarded, the warning horn will not sound if an open occures in wire

Answer 2

4

Question 3

(Refer to figure 23) If R(2) sticks in the up position, the light will

Answer 3

Be on full bright

Question 4

(Refer to figure 7) If resistor R(3) is disconnected at terminal D, what will the ohmmeter read

Answer 4

Infinate resistance

Question 5

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

Answer 5

equal to the sum of all capacitances

Question 6

(Refer to figure 9) How many instruments (voltmeters and ammmeters) are installed correctly

Answer 6

Two

Question 7

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

Answer 7

Inductive resistance

Question 8

(Refer to figure 19) When the landing gears are up and the throttles are retarded, the warning horn will not sound if an open occurs in wire

Answer 8

6

Question 9

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

Answer 9

At least 50 percent greater than the highest applied voltage

Question 10

The three resistors of 3 ohms, 5 ohms, and 22 ohms are connected in series in a 28 volt circuit, how much current will flow through the 3 ohm resistor

Answer 10

0.93 ampere

Question 11

Capacitors are sometimes used in DC circuits to

Answer 11

Smooth out slight pulsations in current/voltage

Question 12

(Refer to figure 6) If resistor R(5) is disconnected at the junction of R(4) and R(3) as shown, what will the ohmmeter read

Answer 12

3 ohms

Question 13

(Refer to figure 19) When the throttles are retarded with only the right gear down, the warning horn will not sound if an open occurs in wire

Answer 13

5

Question 14

(Refer to figure 11) Find the total current flowing in the wire between points C and D

Answer 14

3.0 amperes

Question 15

(Refer to figure 18) The control valve switch must be placed in the neutral position when the landing gear is down to

Answer 15

Prevent the warning horn from sounding when the throttles are closed

Question 16

How many amperes will a 28-volt generator be required to supply to a circuit containing five lamps in parallel, three of which have a resistance of 6 ohms each and two of which have a resistance of 5 ohms each

Answer 16

25.23 amperes

Question 17

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

Answer 17

Static energy

Question 18

(Refer to figure 16) The TCO relay will operate if 24-volts DC is applied to the bus and the fuel tank selector is in the

Answer 18

Crossfeed position

Question 19

What is the total capacitance of a circuit containing three capacitors in parallel with capacitances of .02 microfarad, .05 microfarad, and .10 microfarad, respectively?

Answer 19

.170 uF

Question 20

The voltage drop in a circuit of known resistance is dependant on

Answer 20

The amperage of the circuit

Question 21

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

Answer 21

XOR

Question 22

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

Answer 22

volts

Question 23

which of these will cause the resistance of a conductor to decrease

Answer 23

decrease the length or increase the cross-sectional area

Question 24

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 is measured, it will be

Answer 24

equal to the voltage across the 20-watt light

Question 25

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

Answer 25

24 volts

Question 26

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

Answer 26

in a discharged condition

Question 27

Electrostatic fields are also known as

Answer 27

dielectric fields

Question 28

Which of the following statements is/are generally true regarding the charging of several aircraft batteries together

Answer 28

1 - Batteries of different voltages (but similar capacities) can be connected in series with each other across the charger, and charged using the constant current method. 2 - Batteries of different ampere-hour capacity and same voltage can be connected in parallel with each other across the charger, and charged using the constant voltage method.

Question 29

(Refer to figure 10) What is the measure voltage of the series-parallel circuit between terminals A and B

Answer 29

3.0 volts

Question 30

Convert farads to microfarads by

Answer 30

Multiplying farads by 10 to the power of 6

Question 31

(Refer to figure 21) Which symbol represents a variable resistor

Answer 31

2

Question 32

What does the letter Q symbolize when measuring electric charge

Answer 32

Coulomb

Question 33

(Refer to figure 12) Find the total resistance of the circuit

Answer 33

21.2 ohms

Question 34

The end-of-charge voltage of a 19-cell nickel-cadmium battery, measured while still on charge

Answer 34

depends upon its temperature and the method used for charging.

Question 35

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

Answer 35

plate area and inversely proportional to the distance between the plates

Question 36

Which statement regarding the hydrometer reading of a lead-acid storage battery electolyte is true

Answer 36

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

Question 37

(refer to figure 4) How much power is being furnished to the circuit

Answer 37

2,645 watts

Question 38

(refer to figure 3) when more than two inductors of different inductances are connected in parallel in a circuit, the total inductance is

Answer 38

less than the inductance of the lowest rated inductor

Question 39

(Refer to figure 2) What is the total capacitance of a circuit containing three capacitors with capacitances of .02 microfarad, .05 microfarad, and .10 microfarad, respectively

Answer 39

.0125uF

Question 40

How can the state-of-charge of a nickel-cadmium battery be determined

Answer 40

by a measured discharge

Question 41

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

Answer 41

conduct

Question 42

(Refer to figure 15) with the landing gear retracted, the red indicator light will not come on if an open occurs in wire

Answer 42

19

Question 43

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

Answer 43

impedence

Question 44

The opposition offered by a coil to the flow of alternating current (ignoring resistance) is called

Answer 44

inductive reactance

Question 45

(Refer to figure 16) Energize the circuit with the fuel tank selector switch selected to the left-hand position. Using the schematic, identify the switches that will change position

Answer 45

5,6,11,12,13,15, and 16

Question 46

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

Answer 46

normal operation

Question 47

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

Answer 47

iron

Question 48

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

Answer 48

to completely charge a nickel-cadmium battery, some gassing must take place; thus, some water will be used

Question 49

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

Answer 49

heat or burn marks on the hardware

Question 50

How much power must a 24-volt generator furnish to a system which contains the following loads? One motor (75% efficient) 1/2 HP Three position lights 20 watts each One heating element 5 amp One anticollision light 3 amp (note: 1 hp = 746 watts)

Answer 50

450 watts

Question 51

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

Answer 51

the electrolyte becomes absorbed into the plates

Question 52

(Refer to figure 14) The total resistance of the circuit is

Answer 52

17 ohms

Question 53

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

Answer 53

the state-of-charge of the battery

Question 54

(Refer to figure 64) A 24-volt source is required to furnish 48 watts to a parallel circuit consisting of two resistors of equal value. What is the value of each resistor? (Note: R(t) = E^2/P)

Answer 54

24 ohms

Question 55

(refer to figure 19) under which condition will a ground be provided for the warning horn through both gear switches when the throttles are closed

Answer 55

Left gear up and right gear down

Question 56

In nickel-cadmium batteries, a rise in cell temperature

Answer 56

causes a decrease in internal resistance

Question 57

A 24-volt, 1-horsepower DC electric motor that is 80% efficient requires 932.5 watts. How much power will a 12-volt, 1-horsepower DC electric motor that is 75% efficient require

Answer 57

994.6 watts

Question 58

What is the purpose of the ground symbol used in electrical circuit diagrams

Answer 58

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

Question 59

(refer to figure 11) Find the voltage across the 8-ohm resistor

Answer 59

24 volts

Question 60

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

Answer 60

excessive spewing is likely to occur during the charging cycle

Question 61

.002 kV equals

Answer 61

2.0 volts

Question 62

(refer to figure 64) A 48 volt source is required to furnish 192 watts to a parallel circuit consisting of three resistors of equal value. What is the value of each resistor

Answer 62

36 ohms

Question 63

Which is correct concerning a parallel circuit

Answer 63

Total resistance will be smaller than the smallest resistor

Question 64

What is the total capacitance of a certain circuit containing three capacitors with capacitances of .25 microfarad, .03 microfarad, and .12 microfarad, respectively

Answer 64

.4uF

Question 65

Transfer of electric energy from one circuit to another without the aid of electrical connections

Answer 65

is called induction