Quiz 3 Flashcards
When should tools be inventoried?
before and after each job
The first step to take when a person is rendered unconscious by electrical shock is to:
break the connection between the victim and the circuit
Who develops Material Safety Data Sheets (MSDS) for a chemical?
chemical manufacturer
What formula do you use to find total capacitance when there are three capacitors of the same value connected in series?
Ctot = 1/(1/C1 + 1/C2 + 1/C3)
What changes AC current to DC current?
a rectifier
What formula do you use to find the total resistance of three resistors of different values connected in parallel?
Rtot = 1/(1/R1 + 1/R2 + 1/R3)
What decreases as the frequency of a capacitor increases?
(Xc) Capacitive Reactance
What is 624,000,000 in scientific notation?
6.24 × 10⁸
Conductors have free ______.
electrons
When the wire gauges increase from AWG 1 to AWG 40 for round wire, what decreases?
diameter and circular area
Increasing the amount of forward bias will ______ the resistance of a PN junction diode.
decrease
The cutoff frequency of a filter is the frequency where the output:
drops to 70.7% of its maximum value
If voltage in a power supply increases, then voltage drops across resistors connected to that power supply:
increase
The resistance of a blown fuse is:
infinite Ω
If a resistor has 0 voltage drop, that means the resistor is:
shorted
Hysteresis losses:
increase with high frequencies
Decreasing the amount of forward bias ______ the conduction through a diode.
increases
The resistance of the current return path through the aircraft is always considered negligible if:
it is adequately bonded
The three basic requirements for a practical circuit are:
power source, load, and a conductor
Which rule is used to determine the magnetic polarity of a coil?
left-hand rule
If infinity is measured with an ohmmeter across a diode in both directions, the diode is:
open
In an AC circuit, the effective voltage is:
less than the maximum instantaneous voltage
The basic operation of a transformer is:
inductance
The working voltage of a capacitor in an AC circuit should be:
at least 50% greater than the maximum applied voltage
What is the nominal impedance of a coaxial cable used for aircraft radios?
50 ohms
What type of filter is characterized by a series inductor at the input and a shunt capacitor at the output?
Choke input filter
In scientific notation, what is the base number?
The number to be multiplied by itself
The formula for transformers is:
Vp/Vs = Np/Ns = Is/Ip
Current in a parallel circuit is:
inversely proportional to the circuit’s resistance
An analog multimeter (AMM) checks for:
voltage, current, and resistance
What is the number one concern in regards to electrical safety?
Shock
What component’s value is measured in millihenries?
Inductor
Ohm’s Law characterizes the relationship between:
power, resistance, current, and voltage
The basic properties associated with alternating voltage and current are:
frequency, period, wavelength, and amplitude
Two basic uses for transformers are:
signal matching and power supplies
What are the three basic parts of a transformer?
Primary winding, secondary winding, and core
What part of an atom is associated with the flow of electricity?
Electrons
What in electrons in a conductor determines whether its flow is poor or good?
Whether or not they contain free electrons in the orbit of atoms
Define Static Electricity.
A difference of electrical charge between two non-conductive surfaces
What term is used to express the flow of electricity?
Amperes
What is a coulomb?
A basic unit of electrical quantity equal to 6.28 × 10¹⁸ electrons
What is the basic unit of electrical pressure?
Electron Motive Force (EMF) or Volts
If voltage and resistance are known, how can total current be determined?
I = V / R
What device other than an actual battery can be used to store energy?
Capacitor
Describe the left-hand rule as it pertains to electrical generation.
Thumb = motion of conductor, index finger = magnetic field, middle finger = current flow
What trait allows magnetic lines of flux to flow easily?
Permeability
What is the common electrical point that allows circuits to have a return path to power?
Earth or chassis ground
What is the result of passing too much current in a small gauge wire?
Excessive heat due to high resistance
Describe the relationship in Ohm’s Law.
Voltage = Current × Resistance
How much work can be achieved with one watt of energy?
1 watt = 1/746 horsepower
Describe current in a series circuit.
It is the same at all points
How is voltage distributed in a parallel circuit?
It is equal across all branches
What defines the operational force that resists an aircraft’s forward motion?
Drag
What type of pliers are used for safety-wiring hardware?
Duckbill
Coaxial cable outer shield should be grounded at:
Both input and output ends
With proper bias applied to a transistor, the emitter-base junction has ______ resistance and the collector-base junction has ______ resistance.
low, high
A(n) ______ is used to display the output waveform of a wave-generating circuit.
Oscilloscope
What formula finds total capacitance for three capacitors in parallel?
Ctot = C1 + C2 + C3
How do the elevators of an aircraft move?
Forward and aft movement of the control stick/yoke
In a capacitive circuit, what is the voltage and current relationship?
Voltage lags
When the frequency of an applied voltage increases, the capacitive reactance will:
Decrease
