FAA General 8001-8048
REFER TO FIGURE 2 What is the total capacitance of a certain circuit containing three capacitors with capacitances of .02 microfarad, .05 microfarad, and .10 microfarad, respectively?
.0125 uF
REFER TO FIGURE 2 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
What is the total capacitance of a certain circuit containing three capacitors with capacitances of .25 microfarad, .03 microfarad, and .12 microfarad, respectively?
.4 uF
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-ohms resistor?
0.93 ampere
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?
1 ohms
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?
1,000 watts
REFER TO FIGURE 8 With an ohmmeter connected into the circuit as shown, what will the ohmmeter read?
10 ohms
A circuit has an applied voltage of 30 volts and a load consisting of a 10-ohm resistor in series with a 20-ohms resistor. What is the voltage drop across the 10-ohm resistor?
10 volts
REFER TO FIGURE 4 How much power is being furnished to the circuit?
2,645 watts
.002KV equals
2.0 volts
REFER TO FIGURE 12 Find the total resistance of the circuit.
21.2 ohms
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?
24 ohms
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
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?
24 volts
REFER TO FIGURE 11 Find the voltage across the 8-ohm resistor
24 volts
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?
25.23 amperes
What is the operating resistance of a 30-watt light bulb designed for a 28-volt system?
26 ohms
REFER TO FIGURE 6 If resistor R5 is disconnected at the junction of R4 and R3 as shown, what will the ohm-meter read?
3 ohms
REFER TO FIGURE 11 Find the total current flowing in the wire between points C and D.
3.0 amperes
REFER TO FIGURE 10 What is the measure voltage of the series-parallel circuit between terminals A and B?
3.0 volts
How much power must a 24-volt generator furnish to a system which contains the following loads? One motor (75% efficient) ................1/5 hp Three position lights..........................20 watts each One heating element ........................5 amp One anticollision light........................3 amp
450 watts
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 motor that is 75 percent efficient require?
994.6 watts
Which requires the most electrical power?
A 1/5-horsepower, 24-volt motor which is 75 percent efficient
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 35 milliwatts.
In an ac circuit, the effective voltage is...
less than the maximum instantaneous voltage.
What is the basic unit of electrical quantity?
Coulomb
Which of the following are commonly used as rectifiers in electrical circuits?
Diodes
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.
An increase in which of the following factors will cause an increase in the inductive reactance of a circuit?
Inductance and frequency
What is the opposition to the flow of AC produced by a magnetic field with generated back voltage (EMF) called?
Inductive reactance
REFER TO FIGURE 7 If resistor R3 is disconnected at terminal D, what will the ohmmeter read?
Infinite resistance
Which term means .001 ampere?
Milliampere
Which effect does not apply to the movement of electrons flowing in a conductor?
Static energy
What happens to the current in a voltage step-up transformer with the ratio of 1 to 4?
The current is stepped down by a 1 to 4 ratio
Which statement is correct when made in reference to a parallel circuit?
The total current is equal to the sum of the currents through the individual branches of the circuit.
Which requires the most electrical power during operation? (Note: 1 horsepower=746 watts)
Two lights requiring 3 amperes each in a 24-volt parallel system.
What unit is used to express electrical power?
Watt
What will a voltmeter read if properly connected across a closed switch in a circuit with electrical power on?
Zero voltage
The working voltage of a capacitor in an ac circuit should be...
at least 50 percent greater than the highest applied voltage.
Electrostatic fields are also known as...
dielectric fields
Unless otherwise specified, any values given for current or voltage in an ac circuit are assumed to be...
effective values.
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 is (where the magnetic fields of each inductor do not affect the others)...
equal to the sum of the individual inductances.
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.
The term that describes the combined resistive forces in an ac circuit is...
impedance.
The correct way to connect a test voltmeter in a circuit is...
in parallel with a unit.
The basis for transformer operation in the use of alternating current is mutual...
inductance
The opposition offered by a coil to the flow of alternating current is called (disregard resistance)...
inductive reactance
Transfer of electric energy from one circuit to another without the aid of electrical connections...
is call induction
When calculating power in a reactive or inductive ac circuit, the true power is...
less than the apparent power.
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.
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.
Convert farads to picofarads by...
multiplying farads by 10 to the power of 12
Convert farads to microfarads by....
multiplying farads by 10 to the power of 6
The amount of electricity a capacitor can store is directly proportional to the...
plate area and inversely proportional to the distance between the plates.
Diodes are used in electrical power supply circuits primarily as...
rectifiers
Capacitors are sometimes used in dc circuits to...
smooth out slight pulsations in current/voltage
REFER TO FIGURE 9 How many instruments (volts-meters and ammeters) are installed correctly?
two
The potential difference between two conductors which are insulated form each other is measured in
volts