Fundamentals of Electricity and Electronics Flashcards
(Refer to figure 15) Wire 7 is used to
Close the PUSH-TO-TEST circuit.
(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
4
(Refer to figure 23) If R(2) sticks in the up position, the light will
Be on full bright
(Refer to figure 7) If resistor R(3) is disconnected at terminal D, what will the ohmmeter read
Infinate resistance
When different rated capacitors are connected in parallel in a circuit, the total capacitance is
equal to the sum of all capacitances
(Refer to figure 9) How many instruments (voltmeters and ammmeters) are installed correctly
Two
What is the opposition to the flow of AC produced by an electromagnetic field (EMF) with generated back voltage called
Inductive resistance
(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
6
The working voltage of a capacitor in an AC circuit should be
At least 50 percent greater than the highest applied voltage
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
0.93 ampere
Capacitors are sometimes used in DC circuits to
Smooth out slight pulsations in current/voltage
(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
3 ohms
(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
5
(Refer to figure 11) Find the total current flowing in the wire between points C and D
3.0 amperes
(Refer to figure 18) The control valve switch must be placed in the neutral position when the landing gear is down to
Prevent the warning horn from sounding when the throttles are closed
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
25.23 amperes
Which effect does not apply to the movement of electrons flowing in a conductor
Static energy
(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
Crossfeed position
What is the total capacitance of a circuit containing three capacitors in parallel with capacitances of .02 microfarad, .05 microfarad, and .10 microfarad, respectively?
.170 uF
The voltage drop in a circuit of known resistance is dependant on
The amperage of the circuit
Which of the following logic gates will provide an active high out only when all inputs are different
XOR
The potential difference between two conductors which are insulated from each other is measured in
volts
which of these will cause the resistance of a conductor to decrease
decrease the length or increase the cross-sectional area
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
equal to the voltage across the 20-watt light
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 electrolyte of a nickel-cadmium battery is the lowest when the battery is
in a discharged condition
Electrostatic fields are also known as
dielectric fields
Which of the following statements is/are generally true regarding the charging of several aircraft batteries together
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.
(Refer to figure 10) What is the measure voltage of the series-parallel circuit between terminals A and B
3.0 volts
Convert farads to microfarads by
Multiplying farads by 10 to the power of 6
(Refer to figure 21) Which symbol represents a variable resistor
2
What does the letter Q symbolize when measuring electric charge
Coulomb
(Refer to figure 12) Find the total resistance of the circuit
21.2 ohms
The end-of-charge voltage of a 19-cell nickel-cadmium battery, measured while still on charge
depends upon its temperature and the method used for charging.
The amount of electricity a capacitor can store is directly proportional to the
plate area and inversely proportional to the distance between the plates
Which statement regarding the hydrometer reading of a lead-acid storage battery electolyte is true
The hydrometer reading does not require a temperature correction if the electrolyte temperature is 80F
(refer to figure 4) How much power is being furnished to the circuit
2,645 watts
(refer to figure 3) when more than two inductors of different inductances are connected in parallel in a circuit, the total inductance is
less than the inductance of the lowest rated inductor
(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
.0125uF
How can the state-of-charge of a nickel-cadmium battery be determined
by a measured discharge
Forward biasing of a solid-state device will cause the device to
conduct
(Refer to figure 15) with the landing gear retracted, the red indicator light will not come on if an open occurs in wire
19
The term that describes the combined resistive forces in an AC circuit is
impedence
The opposition offered by a coil to the flow of alternating current (ignoring resistance) is called
inductive reactance
(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
5,6,11,12,13,15, and 16
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 operation
Through which material will magnetic lines of force pass the most readily
iron
Which of the following best describes the operating principal in a nickel-cadmium battery installed in an aircraft
to completely charge a nickel-cadmium battery, some gassing must take place; thus, some water will be used
Which condition is an indication of improperly torqued cell link connections of a nickel cadmium battery
heat or burn marks on the hardware
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)
450 watts
During discharge, nickel-cadmium batteries will show a lower liquid level than when at full charge because
the electrolyte becomes absorbed into the plates
(Refer to figure 14) The total resistance of the circuit is
17 ohms
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
(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)
24 ohms
(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
Left gear up and right gear down
In nickel-cadmium batteries, a rise in cell temperature
causes a decrease in internal resistance
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
994.6 watts
What is the purpose of the ground symbol 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
(refer to figure 11) Find the voltage across the 8-ohm resistor
24 volts
What may result if water is added to a nickel-cadmium battery when it is not full charged
excessive spewing is likely to occur during the charging cycle
.002 kV equals
2.0 volts
(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
36 ohms
Which is correct concerning a parallel circuit
Total resistance will be smaller than the smallest resistor
What is the total capacitance of a certain circuit containing three capacitors with capacitances of .25 microfarad, .03 microfarad, and .12 microfarad, respectively
.4uF
Transfer of electric energy from one circuit to another without the aid of electrical connections
is called induction
