Font size
WorksheetsBasic Electricity ASA Gen.
Total questions: 122
Worksheet time: 31hrs 30mins
(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
4 ohms
12 ohms
Which effect does not apply to the movement of electrons flowing in a conductor?
Magnetic energy
Thermal energy
Static energy
Which condition is an indication of improperly torqued cell link connections of a nickel-cadmium battery?
Light spewing at the cell caps
Toxic and corrosive deposits of potassium carbonate
Heat or burn marks on the hardware
(Refer to Figure 18.) When the landing gears are up and the throttles are retarded, the warning horn will not sound if an open occurs in wire
No. 4
No. 2
No. 9
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.
3. 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.
3
2 and 3
1 and 2
The electrolyte of a nickel cadmium battery is highest when the battery is
in a fully charged condition
in a discharged condition
under a no-load condition
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?
12 volts
6 volts
24 volts
The purpose of providing a space underneath the plates in a lead acid battery's cell container is to
prevent sediment buildup from contacting the plates and causing a short circuit
allow for convection flow of the electrolyte in order to provide for cooling of the plates
ensure that the electrolyte quantity ratio to the number of plates and plate area is adequate
When different rated capacitors are connected in parallel in a circuit, the total capacitance is
(Note: C(T) = C(1) + C(2) + C(3) . . .)
less than the capacitance of the lowest rated capacitor
equal to the capacitance of the highest rated capacitor
equal to the sum of all the capacitances
A 12-volt electric motor has 1,000 watts input and 1 horsepower output. Maintaining the same efficiency, how much input power will a 24-volt, 1-horsepower electric motor require?
(Note: 1 horsepower = 746 watts)
1,000 watts
2,000 watts
500 watts
A 14-ohm resistor is to be installed in a series circuit carrying .05 ampere. How much power will the resistor be required to dissipate?
At least .70 milliwatt
At least 35 milliwatts
Less than .035 watt
(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?
Right gear up and left gear down.
Both gears up and the control valve out of neutral
Left gear up and right gear down
(Refer to Figure 24.) Which statement concerning the depicted logic gate is true?
Any input being 1 will produce a 0 output
Any input being 1 will produce a 1 output
All inputs must be 1 to produce a 1 output
(Refer to Figure 12.) Find the total resistance of the circuit.
16 ohms
2.6 ohms
21.2 ohms
What is the opposition to the flow of AC produced by a magnetic field with generated back voltage (EMF) called?
Inductive reactance
Capacitive reactance
Mutual inductance
(Refer to Figure 16.) With power to the bus and the fuel selector switched to the right-hand tank, how many relays in the system are operating?
Three
Two
Four
Typical application for zener diodes is as
full-wave rectifier
half-wave rectifier
voltage regulators
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?
1.11 amperes
1 ampere
25.23 amperes
What unit is used to express electrical power?
Volt
Watt
Ampere
(Refer to Figure 20.) Troubleshooting an open circuit with a voltmeter as shown in this circuit will
permit current to flow and illuminate the lamp
create a low resistance path and the current flow will be greater than normal
permit the battery voltage to appear on the voltmeter
A lead-acid battery with 12 cells connected in series (no-load voltage = 2.1 volts per cell) furnishes 10 amperes to a load of 2-ohms resistance. The internal resistance of the battery in this instance is
0.52 ohm
2.52 ohm
5.0 ohm
(Refer to Figure 8.) With an ohmmeter connected into the circuit as shown, what will the ohmmeter read?
20 ohms
Infinite resistance
10 ohms
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
The current is stepped up by a 1 to 4 ratio
The current does not change
What factors strengthen a coil inductor?
Limiting and separating the coils
Adding and separating the coils
Adding coils close together
The end-of-charge voltage of a 19-cell nickel-cadmium battery, measured while still on charge,
must be 1.2 to 1.3 volts per cell
must be 1.4 volts per cell
depends upon its temperature and the method used for charging
(Refer to Figure 15.) With the landing gear retracted, the red indicator light will not come on if an open occurs in wire
No. 19
No. 7
No. 17
What determines the amount of current which will flow through a battery while it is being charged by a constant voltage source?
The total plate area of the battery
The state-of-charge of the battery
The ampere-hour capacity of the battery
(Refer to Figure 23.) If R(2) sticks in the up position, the light will
be on full bright
be very dim
not illuminate
A 1-horsepower, 24-volt dc electric motor that is 80 percent efficient requires 932.5 watts. How much power will a 1-horsepower, 12-volt dc electric motor that is 75 percent efficient require?
(Note: 1 horsepower = 746 watts)
932.5 watts
1,305.5 watts
994.6 watts
(Refer to Figure 17.) The electrical symbol represented at number 5 is a variable
inductor
resistor
capacitor
(Refer to Figure 4.) How much power is being furnished to the circuit?
575 watts
2,875 watts
2,645 watts
(Refer to Figure 25.) In a functional and operating circuit, the depicted logic gate's output will be 0
only when all inputs are 0
when all inputs are 1
when one or more inputs are 0
What does the letter Q symbolize when measuring electrical charge?
Farad
Electron
Coulomb
The opposition offered by a coil to the flow of alternating current is called (disregard resistance)
impedance
reluctance
inductive reactance
In a parallel circuit with three 6-ohm resistors across a 12-volt battery, what is the total current (It) value in the circuit?
2 amps
6 amps
12 amps
The electrolyte of a nickel-cadmium battery is the lowest when the battery is
being charged
in a discharged position
under a heavy load condition
(Refer to Figure 21.) Which symbol represents a variable resistor?
2
1
3
(Refer to Figure 16.) What will be the effect if the PCO relay fails to operate when the left-hand tank is selected?
The fuel pressure crossfeed valve will not open
The fuel tank crossfeed valve open light will illuminate
The fuel pressure crossfeed valve open light will not illuminate
What will a voltmeter read if properly connected across a closed switch in a circuit with electrical power on?
Voltage drop in the component(s) the switch is connected to
System voltage
Zero voltage
(Refer to Figure 11.) Find the voltage across the 8-ohm resistor.
8 volts
20.4 volts
24 volts
(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
right-hand tank position
crossfeed position
left-hand tank position
(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
12 ohms
6 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
No. 5
No. 13
No. 6
In a parallel circuit with four 6-ohm resistors across a 24-volt battery, what is the total voltage across resistor-three (VR3) in the circuit?
6 volts
18 volts
24 volts
If 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?
9.3 amperes
1.05 amperes
0.93 amperes
What is the purpose of the ground symbol used in electrical circuit diagrams?
To show that there is common bus for connection of the source of electrical energy to the load
To show the source of electrical energy for the load
To show that there is a return path for the current between the source of electrical energy and the load
(Refer to Figure 5.) What is the impedance of an ac-series circuit consisting of an inductor with a reactance of 10 ohms, a capacitor with a reactance of 4 ohms, and a resistor with a resistance of 8 ohms?
22 ohms
5.29 ohms
10 ohms
The voltage drop in a circuit of known resistance is dependent on
the voltage of the circuit
only the resistance of the conductor and does not change with a change in either voltage or amperage
the amperage of the circuit
UNIT RATING
One motor (75 percent efficient)--1/5 hp
Three position lights--20 watts each
One heating element--5 amp
One anticollision light--3 amp
(Note: 1 horsepower = 746 watts)
402 watts
385 watts
450 watts
In a P-N-P transistor application, the solid state device is turned on when the
base is negative with respect to the emitter
base is positive with respect to the emitter
emitter is negative with respect to the base
(Refer to Figure 11.) Find the total current flowing in the wire between points C and D.
6.0 amperes
2.4 amperes
3.0 amperes
What is the total capacitance of a certain circuit containing three capacitors with capacitances of .25 microfarad, .03 microfarad, and .12 microfarad, respectively?
(Note: C(T) = C(1) + C(2) + C(3))
.4 uF
.04pF
.04 uF
Which term means .001 ampere?
Microampere
Kiloampere
Milliampere
A fully charged lead-acid battery will not freeze until extremely low temperatures are reached because
the acid is in the plates, thereby increasing the specific gravity of the solution
most of the acid is in the solution
increased internal resistance generates sufficient heat to prevent freezing
Which is correct in reference to electrical resistance?
Two electrical devices will have the same combined resistance if they are connected in series as they will have if connected in parallel
If one of three bulbs in a parallel lighting circuit is removed, the total resistance of the circuit will become greater
An electrical device that has a high resistance will use more power than one with a low resistance with the same applied voltage
(Refer to Figure 15.) The No. 7 wire is used to
close the PUSH-TO-TEST circuit
open the UP indicator light circuit when the landing gear is retracted
close the UP indicator light circuit when the landing gear is retracted
Which of the following best describes the contributing factors to thermal runaway in a nickel-cadmium battery installed in an aircraft?
High internal resistance intensified by high cell temperatures and a high current discharge/charge rate in a constant potential 9voltage) charging system
Low internal resistance intensified by high cell temperatures and a high voltage discharge/charge rate in a constant current charging system
Low internal resistance intensified by high cell temperatures and a high current discharge/charge rate in a constant potential (voltage) charging system
The correct way to connect a test voltmeter in a circuit is
in series with a unit
between the source voltage and the load
in parallel with a unit
Convert farads to picofarads by:
multiplying farads by 10 to the power of 12
multiplying microfarads by 10 to the power of -12
multiplying picofarads by 10 to the power of 12
In an N-P-N transistor application, the solid state device is turned on when the
emitter is positive with respect to the base
base is negative with respect to the emitter
base is positive with respect to the emitter
What may result if water is added to a nickel-cadmium battery when it is not fully charged?
Excessive electrolyte dilution
Excessive spewing is likely to occur during the charging cycle
No adverse effects since water may be added anytime
Through which material will magnetic lines of force pass the most readily?
Copper
Iron
Aluminum
If each cell, connected in series, equals 2 volts, how would a 12-cell lead acid battery be rated?
24 volts
12 volts
6 volts
How can the state-of-charge of a nickel-cadmium battery be determined?
By measuring the specific gravity of the electrolyte
By a measured discharge
By the level of the electrolyte
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 specific gravity correction should be added to the hydrometer reading if the electrolyte temperature is below 59°F
The hydrometer reading will give a true indication of the capacity of the battery regardless of the electrolyte temperature
Capacitors are sometimes used in dc circuits to
counteract inductive reactance at specific locations
smooth out slight pulsations in current/voltage
assist in stepping voltage and current up and/or down
(Refer to Figure 1.) When different rated capacitors are connected in series in a circuit, the total capacitance is
less than the capacitance of the lowest rated capacitor
greater than the capacitance of the highest rated capacitor
equal to the sum of all the capacitances
Which of these will cause the resistance of a conductor to decrease?
Decrease the length or the cross-sectional area
Decrease the length or increase the cross-sectional area
Increase the length or decrease the cross-sectional area
(Refer to Figure 10.) What is the measured voltage of the series-parallel circuit between terminals A and B?
1.5 volts
3.0 volts
4.5 volts
A thermal switch, or thermal protector, as used in an electric motor, is designed to
close the integral fan circuit to allow cooling of the motor
open the circuit in order to allow cooling of the motor
reroute the circuit to ground
What is the likely result of servicing and charging nickel-cadmium and lead acid batteries together in the same service area?
Lowered amp-hour capacities, for both types of batteries
Reduced battery service life for both types of batteries
Contamination of both types of batteries
What is the basic unit of electrical quantity?
Electromotive force
Ampere
Coulomb
(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
equal to the inductance of the highest rated inductor
equal to the sum of the individual inductances
Which of the following best describes the operating principal in a nickel-cadmium battery installed in an aircraft?
At full charge, the electrolyte will be at its lowest level and should be filled
To completely charge a nickel-cadmium battery, some gassing must take place; thus, some water will be used
When positive plates slowly give up oxygen, which is regained by the negative plates, the battery is charging
(Refer to Figure 17.) Which of the components is a potentiometer?
5
3
11
Which of the following are commonly used as a rectifier in electrical circuits?
Anodes
Cathodes
Diodes
The amount of electricity a capacitor can store is directly proportional to the
distance between the plates and inversely proportional to the plate area
plate area and is not affected by the distance between the plates
plate area and inversely proportional to the distance between the plates
(Refer to Figure 7.) If resistor R(3) is disconnected at terminal D, what will the ohmmeter read?
Infinite resistance
10 ohms
20 ohms
The method used to rapidly charge a nickel-cadmium battery utilizes
constant current and constant voltage
constant current and varying voltage
constant voltage and varying current
(Refer to Figure 13.) Determine the total current flow in the circuit.
0.2 ampere
1.4 amperes
0.8 ampere
The potential difference between two conductors which are insulated from each other is measured in
volts
amperes
coulombs
Transfer of electric energy from one circuit to another without the aid of electrical connections
is called induction
is called capacitance
can cause excessive arcing and heat, and as a result is practical for use only with low voltage/amperages
A circuit has an applied voltage of 30 volts and a load consisting of a 10-ohm resistor in series with a 20-ohm resistor. What is the voltage drop across the 10-ohm resistor?
10 volts
20 volts
30 volts
Diodes are used in electrical power supply circuits primarily as
switches
rectifiers
relays
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
excessive gassing
plate sulfation
Convert farads to microfarads by
multiplying farads by 10 to the power of 6
multiplying picofarads by 10 to the power of 6
multiplying microfarads by 10 to the power of 6
Which is correct concerning a parallel circuit?
Total resistance will be smaller than the smallest resistor
Total resistance will decrease when one of the resistances is removed
Total voltage drop is the same as the total resistance
The term that describes the combined resistive forces in an ac circuit is
resistance
reactance
impedance
Which requires the most electrical power?
(Note: 1 horsepower = 746 watts)
A 1/5 horsepower, 24-volt motor which is 75 percent efficient
Four 30-watt lamps arranged in a 12-volt parallel circuit
A 24-volt anticollision light circuit consisting of two light assemblies which require 3 amperes each during operation
(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?
2.76 ohms
3 ohms
12 ohms
When calculating power in a reactive or inductive ac circuit, the true power is
more than the apparent power
less than the apparent power in a reactive circuit and more than the apparent power in an inductive circuit
less than the apparent power
Which requires the most electrical power during operation?
(Note: 1 horsepower = 746 watts)
A 12-volt motor requiring 8 amperes
Four 30-watt lamps in a 12-volt parallel circuit
Two lights requiring 3 amperes each in a 24-volt parallel system
When a charging current is applied to a nickel cadmium battery, the cells emit gas
toward the end of the charging cycle
throughout the charging cycle
especially if the electrolyte level is high
(Refer to Figure 22.) Which illustration is correct concerning bias application and current (positive charge) flow?
1
2
3
(Refer to Figure 9.) How many instruments (voltmeters and ammeters) are installed correctly?
Three
One
Two
(Refer to Figure 15.) When the landing gear is down, the green light will not come on if an open occurs in wire
No. 7
No. 6
No. 17
(Refer to Figure 18.) The control valve switch must be placed in the neutral position when the landing gears are down to
permit the test circuit to operate
prevent the warning horn from sounding when the throttles are closed
remove the ground from the green light
(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, 9, 10, 11, 12, 13, 15
3, 5, 6, 7, 11, 13
5, 6, 11, 12, 13, 15, 16
(Refer to Figure 23.) If an open occurs at R(1), the light
cannot be turned on
will not be affected
cannot be turned off
.002KV equals
20 volts
2.0 volts
.2 volts
Unless otherwise specified, any values given for current or voltage in an ac circuit are assumed to be
instantaneous values
effective values
maximum values
(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
No. 5
No. 7
No. 6
In an ac circuit, the effective voltage is
equal to the maximum instantaneous voltage
greater than the maximum instantaneous voltage
less than the maximum instantaneous voltage
(Refer to Figure 14.) The total resistance of the circuit is
25 ohms
35 ohms
17 ohms
If electrolyte from a lead-acid battery is spilled in the battery compartment, which procedure should be followed?
Apply boric acid solution to the area followed by a water rinse
Rinse the affected area thoroughly with clean water
Apply sodium bicarbonate solution to the affected area followed by a water rinse
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
half the voltage across the 20-watt light
one-third of the input voltage
The working voltage of a capacitor in an ac circuit should be
equal to the highest applied voltage
at least 20 percent greater than the highest applied voltage
at least 50 percent greater than the highest applied voltage
When inductors are connected in series in a circuit, the total inductance is (where the magnetic fields of each inductor do not affect the others)
(Note: L(T) = L(1) + L(2) + L(3) . . .)
less than the inductance of the lowest rated inductor
equal to the inductance of the highest rated inductor
equal to the sum of the individual inductances
(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?
.170 uF
0.125pF
.0125 uF
(Refer to Figure 26.) Which of the logic gate output conditions is correct with respect to the given inputs?
1
2
3
An increase in which of the following factors will cause an increase in the inductive reactance of a circuit?
Inductance and frequency
Resistance and voltage
Resistance and capacitive reactance
Electrostatic fields are also known as
Dielectric fields
Electrostatic fields
Static fields
Which of the following logic gates will provide an active high out only when all inputs are different?
XNOR
NAND
XOR
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
0.125 pF
.0125 uF
When referencing resistance in a parallel DC circuit, which of the following statements is true?
The current is equal in all portions of the circuit
The total current is equal to the sum of the currents through the individual branches of the circuit
The current in amperes can be found by dividing the EMF in volts by the sum of the resistors in ohms
During discharge, nickel-cadmium batteries will show a lower liquid level than when at full charge because
a chemical action causes the electrolyte to evaporate through the vents
current leakage from individual cells cause a rise in temperature
the electrolyte becomes absorbed into the plats
When referring to an electrical circuit diagram, what point is considered to be at zero voltage?
The circuit breaker
The switch
The ground reference
Forward biasing of a solid state device will cause the device to
conduct via zener breakdown
conduct
turn off
What is the operating resistance of a 30-watt light bulb designed for a 28-volt system?
1.07 ohms
26 ohms
0.93 ohms
(Refer to Figure 16.) When electrical power is applied to the bus, which relays are energized?
PCC and TCC
TCC and TCO
PCO and PCC
The basis for transformer operation in the use of alternating current is mutual
inductance
capacitance
reactance
In nickel-cadmium batteries, a rise in cell temperature
causes an increase in internal resistance
causes a decrease in internal resistance
increases cell voltage
