2A Midterm
In sine wave terminology, the average value is _____.
0.637 × Peak Value
A right triangle has two sides that are 9 inches and 12 inches. How long is the hypotenuse?
15 inches
A circuit has a peak voltage of 275V. What is the average voltage value?
175V
Nickel-Cadmium (ni-cad) cells can be charged and discharged about _____ times.
2000
A wire that has a diameter of 162 mils has an area of _____ circular mils.
26,244
Given: A circuit has a RMS voltage of 120VAC. What is the peak-to-peak voltage?
340V
What is the Hertz rating of an AC circuit if the frequency is 20 cycles per 1/2 second?
40Hz
Maximum voltage is generated by rotating wire when the conductor is moving _____.
Across the field at 90°
According to the power triangle, the apparent power is _____.
Greater than the true power
The unit of inductance is the _____.
Henry
In a triangle, VA is equal to the _____.
Hypotenuse
The side of a right triangle that is opposite the right angle is called the _____.
Hypotenuse
The total current-limiting effect is called _____.
Impedence
Materials that increase the resistance with an increase in temperature have a _____ coefficient of temperature.
Positive
PF
Power Factor
A cell which cannot be recharged is a _____ cell
Primary
Unless otherwise noted, the calculations in AC circuits use _____.
RMS Values
VARs
Reactive Power
Solving combination circuits includes a step in which you _____.
Reduce the circuit to a simpler circuit
Once an arc is started in a gas, the voltage required to maintain conduction is _____.
Reduced
In a series circuit, the total _____ is equal to the sum of the individual resistors.
Resistance
The longer the conductor, the more _____ it will have.
Resistance
When AC voltage is rectified and converted into DC, the resulting waveform is normally not pure, flat DC. The pulses that occur are called _____.
Ripples
A cell which can be recharged is a _____ cell.
Secondary
An ammeter is connected in _____ with the load to permit the load to limit current flow.
Series
The most common of all AC waveforms is the _____ wave.
Sine
The _____ effect occurs when AC induces Eddy currents into the conductor, which cause the electrons to be repelled toward the outer surface of the conductor.
Skin
_____ is a measure of the amount of acid contained in water.
Specific Gravity
When using the left-hand generator rule, the thumb points to the direction of _____.
Thrust
Z
Total Circuit Impedance
What uses electromagnetic induction to transfer electrical energy from one circuit to another?
Transformer
In a DC circuit, the product of volts times the amperes is called _____ power.
True
Power Factor (PF) is the ratio of the _____ power to the _____ power.
True, Apparent
Transformers, in which the primary and secondary voltages are 180 degrees out of phase, are known as _____.
Unlike-Wound Transformers
Of the different power values in a RL circuit, which is known as apparent power?
VA
Of the different power values in an RL circuit, which is known as wattless power?
VARs
Reactive power of an inductor has the symbol of _____.
VARs
ER
Voltage Drop Across the Resistance
EL
Voltage drop across the Inductor
P
Watts (True Power)
In an inductive AC circuit, when the applied voltage is at its maximum negative value, the current is _____.
Zero
Moving coil meter is another name for the _____ meter movement.
d'Arsonval
In a right triangle, the two non-right angles are each formed by the hypotenuse and one of the other sides. From this perspective of the angle, the side that is not the hypotenuse is called the _____.
Adjacent Side
In AC circuits containing only resistance, _____.
All DC rules and laws apply, including Ohm's law
A test meter that uses a scale and pointer to indicate values is a(n) _____ meter.
Analog
In an electroplating operation, the positive terminal is called the _____.
Anode
The product of the source voltage and the total current is _____.
Apparent Power
VA
Apparent Power
If the vector diagram of two AC waveforms is a right triangle, then the waves _____.
Are 90° out of phase
RMS × 0.9
Average Voltage
The word _____ is often used in reference to a single cell.
Battery
In a circuit that has both capacitance and resistance, the current will lead the voltage _____.
By some angle between 0° and 90°
When using a _____ ammeter, the meter is only connected to one of the lines.
Clamp-On
There are six current-carrying conductors in a raceway that is to be installed in an area with an ambient temperature of 90°F. It is necessary to _____.
Correct for temperature and derate (because of the number of conductors)
Dividing a circuits total applied voltage by the total impedance results in the total _____.
Current
In a series circuit, the _____ is the same at any point in the circuit.
Current
The amount of power a cell can deliver is called its _____ capacity.
Current
I
Current Flow
The self-induced voltage across an inductance is equal to the change in _____.
Current with respect to time
The unit circular mil is equal to the _____.
Diameter of the wire in mils squared
The process of separating elements electrically is known as _____.
Electrolysis
The amount of voltage produced by a cell depends on the materials used to make it. A list of metals showing their willingness to accept electrons is called the _____ Series of Metals.
Electromotive
An ion is an atom that has had a(n) _____ added or removed.
Electron
The process of depositing one type of metal onto another using electricity is called _____.
Electroplating
In a parallel circuit, the voltage across the resistor and the voltage across the inductor are _____.
In phase
If the area of the plates of a capacitor is increased, the amount of capacitance _____.
Increases
Opening the secondary of a CT under load will cause a dangerous level of _____.
Induced High Voltage
Circuits are generally considered to contain _____ when any type of load that contains a coil is used.
Inductance
What opposes any change in circuit current?
Inductance
L
Inductance of the Inductor
The symbol XL stands for _____.
Inductive Reactance
What is true of the current in a capacitive circuit?
It leads the voltage
The operating principles of the cathode-ray tube were discovered by _____.
J.J. Thomson
An induced voltage opposes the motion that causes it, according to _____.
Lenz's Law
The _____ effect occurs when the connection of a meter to the circuit changes the entire circuit operation.
Loading
The insulation used on conductors cannot operate in all possible temperatures. The highest allowable temperature is called the _____ temperature.
Maximum Operating
A(n) _____ must NEVER be connected to a circuit when the circuit power is turned on.
Ohmmeter
A special meter that is used to display short-duration, low-voltage pulses is called a(n) _____.
Oscilloscope
One method of adding two vectors that originate at the same point is the _____ method.
Parallelogram
What is the approximate sum of the following two vectors: magnitude 20 at 30° and magnitude 10 at 60°?
magnitude 29 at 40°
