ASA Prepware General Written master
study guide
The working voltage of a capacitor in an AC circuit should be... - correct answer ✔✔at least 50% greater
than the highest applied voltage
The term that described the combined resistive forces in an AC circuit is... - correct answer
✔✔Impedance
What is the opposition to the flow of AC produced by a magnetic field with a generated back voltage
(EMF) called? - correct answer ✔✔Inductive resistance
Electrostatic fields are also known as... - correct answer ✔✔Dielectric fields
The basis for transformer operation in the use of alternating current is mutual... - correct answer
✔✔inductance
What factors strengthen a coil inductor? - correct answer ✔✔Adding coils close together
An increase in which of the following factors will cause an increase in the inductive reactance of a
circuit? - correct answer ✔✔Inductance and frequency
When different rated capacitors are connected in series in a circuit, the total capacitance is... - correct
answer ✔✔Less than the capacitance of the lowest rated capacitor
Capacitors are sometimes used in DC circuits to... - correct answer ✔✔Smooth out slight pulsations in
current/voltage
The amount of electricity a capacitor can store is directly proportional to the... - correct answer ✔✔Plate
area and inversely proportional to the distance between the plates.
,What is the total capacitance of a certain circuit containing three capacitors in series with capacitances
of .02 microfarad, .05 microfarad, and .10 microfarad, respectively? - correct answer ✔✔.0125
microfarads
What is the total capacitance of a circuit containing three capacitors in parallel with capacitances of .02
microfarads, .05 microfarads, .10 microfarads, respectively? - correct answer ✔✔.170 microfarads
Convert farads to microfarads by... - correct answer ✔✔Multiplying farads by 10 to the power of 6.
Convert farads to picofarads by... - correct answer ✔✔multiplying farads by 10 to the power of 12
Unless otherwise specified, any values given for current or voltage in an AC circuit are assumed to be -
correct answer ✔✔effective values
When different rated capacitors are connected in parallel in a circuit, the total capacitance is... - correct
answer ✔✔equal to the sum of all the capacitances
When inductors are connected in series in a circuit, the total inductance is - correct answer ✔✔equal to
the sum of the individual inductances.
When more than two inductors of different inductances are connected in parallel in a circuit, the total
inductance is... - correct answer ✔✔less than the inductance of the lowest rated inductor
What requires the most electrical power during operation? - correct answer ✔✔Two lights requiring 3
amperes each in a 24 volt parallel system
A 12V 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. - correct answer ✔✔1,000
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? - correct answer ✔✔25.2 amps
,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? - correct
answer ✔✔994.6 watts
The potential difference between two conductors which are from each other is measured in... - correct
answer ✔✔Volts
Which effect does not apply to the movement of the electrons flowing in a conductor. - correct answer
✔✔Static energy
A 24V 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? - correct answer ✔✔24V
When calculating power in a reactive or inductive AC circuit, the true power is... - correct answer
✔✔Less than the apparent power.
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? - correct answer ✔✔10
ohms
What will a voltmeter read if properly connected across a closed switch in a circuit with electrical power
on? - correct answer ✔✔0V
The correct way to connect a test voltmeter in a circuit is... - correct answer ✔✔in parallel with a unit
Which term means .001 Amp - correct answer ✔✔milliamp
what does the leter Q symbolize when measuring electrical charge? - correct answer ✔✔Coulomb
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... - correct answer ✔✔Equal to the voltage
across the 20 watt
, A 14 ohm resistor is to be installed in a series circuit carrying .05 amps. How much power will the resistor
be required to dissipate? - correct answer ✔✔At least 35 milliwatts
.002KV equals... - correct answer ✔✔2.0 volts
The opposition offered by a coil to the flow of alternating current is called... - correct answer
✔✔inductive reactance
Diodes are used in electrical power supply circuits primarily as... - correct answer ✔✔rectifiers
If each cell, connected in series, equals 2 volts, how would a 12-cell lead acid battery be rated? - correct
answer ✔✔24 volts
Which requires the most electrical power? - correct answer ✔✔A 1/5-horsepower, 24-volt motor which
is 75 percent efficient.
Transfer of electric energy from one circuit to another without the aid of electrical connection... - correct
answer ✔✔is called induction
A fully charged lead-acid battery will not freeze until extremely low temperatures are reached because...
- correct answer ✔✔most of the acid is in the solution
A thermal switch, or thermal protector, as used in an electric motor, is designed to... - correct answer
✔✔Open the circuit in order to allow cooling of the motor
Which best describes the contributing factors to thermal runaway in a nickel-cadmium battery installed
in an aircraft? - correct answer ✔✔Low internal resistance intensified by a high cell temperature and a
high current discharge/charge rate in a constant potential (voltage) charging system
Which effect does not apply to the movement of electrons flowing in a conductor? - correct answer
✔✔Static energy
study guide
The working voltage of a capacitor in an AC circuit should be... - correct answer ✔✔at least 50% greater
than the highest applied voltage
The term that described the combined resistive forces in an AC circuit is... - correct answer
✔✔Impedance
What is the opposition to the flow of AC produced by a magnetic field with a generated back voltage
(EMF) called? - correct answer ✔✔Inductive resistance
Electrostatic fields are also known as... - correct answer ✔✔Dielectric fields
The basis for transformer operation in the use of alternating current is mutual... - correct answer
✔✔inductance
What factors strengthen a coil inductor? - correct answer ✔✔Adding coils close together
An increase in which of the following factors will cause an increase in the inductive reactance of a
circuit? - correct answer ✔✔Inductance and frequency
When different rated capacitors are connected in series in a circuit, the total capacitance is... - correct
answer ✔✔Less than the capacitance of the lowest rated capacitor
Capacitors are sometimes used in DC circuits to... - correct answer ✔✔Smooth out slight pulsations in
current/voltage
The amount of electricity a capacitor can store is directly proportional to the... - correct answer ✔✔Plate
area and inversely proportional to the distance between the plates.
,What is the total capacitance of a certain circuit containing three capacitors in series with capacitances
of .02 microfarad, .05 microfarad, and .10 microfarad, respectively? - correct answer ✔✔.0125
microfarads
What is the total capacitance of a circuit containing three capacitors in parallel with capacitances of .02
microfarads, .05 microfarads, .10 microfarads, respectively? - correct answer ✔✔.170 microfarads
Convert farads to microfarads by... - correct answer ✔✔Multiplying farads by 10 to the power of 6.
Convert farads to picofarads by... - correct answer ✔✔multiplying farads by 10 to the power of 12
Unless otherwise specified, any values given for current or voltage in an AC circuit are assumed to be -
correct answer ✔✔effective values
When different rated capacitors are connected in parallel in a circuit, the total capacitance is... - correct
answer ✔✔equal to the sum of all the capacitances
When inductors are connected in series in a circuit, the total inductance is - correct answer ✔✔equal to
the sum of the individual inductances.
When more than two inductors of different inductances are connected in parallel in a circuit, the total
inductance is... - correct answer ✔✔less than the inductance of the lowest rated inductor
What requires the most electrical power during operation? - correct answer ✔✔Two lights requiring 3
amperes each in a 24 volt parallel system
A 12V 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. - correct answer ✔✔1,000
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? - correct answer ✔✔25.2 amps
,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? - correct
answer ✔✔994.6 watts
The potential difference between two conductors which are from each other is measured in... - correct
answer ✔✔Volts
Which effect does not apply to the movement of the electrons flowing in a conductor. - correct answer
✔✔Static energy
A 24V 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? - correct answer ✔✔24V
When calculating power in a reactive or inductive AC circuit, the true power is... - correct answer
✔✔Less than the apparent power.
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? - correct answer ✔✔10
ohms
What will a voltmeter read if properly connected across a closed switch in a circuit with electrical power
on? - correct answer ✔✔0V
The correct way to connect a test voltmeter in a circuit is... - correct answer ✔✔in parallel with a unit
Which term means .001 Amp - correct answer ✔✔milliamp
what does the leter Q symbolize when measuring electrical charge? - correct answer ✔✔Coulomb
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... - correct answer ✔✔Equal to the voltage
across the 20 watt
, A 14 ohm resistor is to be installed in a series circuit carrying .05 amps. How much power will the resistor
be required to dissipate? - correct answer ✔✔At least 35 milliwatts
.002KV equals... - correct answer ✔✔2.0 volts
The opposition offered by a coil to the flow of alternating current is called... - correct answer
✔✔inductive reactance
Diodes are used in electrical power supply circuits primarily as... - correct answer ✔✔rectifiers
If each cell, connected in series, equals 2 volts, how would a 12-cell lead acid battery be rated? - correct
answer ✔✔24 volts
Which requires the most electrical power? - correct answer ✔✔A 1/5-horsepower, 24-volt motor which
is 75 percent efficient.
Transfer of electric energy from one circuit to another without the aid of electrical connection... - correct
answer ✔✔is called induction
A fully charged lead-acid battery will not freeze until extremely low temperatures are reached because...
- correct answer ✔✔most of the acid is in the solution
A thermal switch, or thermal protector, as used in an electric motor, is designed to... - correct answer
✔✔Open the circuit in order to allow cooling of the motor
Which best describes the contributing factors to thermal runaway in a nickel-cadmium battery installed
in an aircraft? - correct answer ✔✔Low internal resistance intensified by a high cell temperature and a
high current discharge/charge rate in a constant potential (voltage) charging system
Which effect does not apply to the movement of electrons flowing in a conductor? - correct answer
✔✔Static energy
