Chapter 2 Practice Test Flashcards
Capacitance increases with:
Larger plate area and less distance between the plates.
The current at resonance in a series LC circuit is?
Maximum.
A transformer used to step up its input voltage must have.
More turns of wire on its secondary than on its primary.
The measure of the opposition to the flow of alternating current caused by the inductance and capacitance in a circuit rather than by resistance.
Reactance.
A laminated iron-core transformer has reduced eddy-current losses because.
The laminations are insulated from each other.
Inductive reactance.
Applies only to sine waves.
One of the main applications of a capacitor is to:
Block DC and pass AC.
If the secondary current in a step-down transformer increases, the primary current will.
Increase.
In a series RC circuit.
Ic and Ir are in phase.
The inductive reactance of an inductor is?
Directly proportional to frequency.
A circuit that is used to determine the value of an unknown resistance. This type of circuit is generally drawn in a diamond-like arrangement.
Wheatstone bridge.
The output frequency is determined by the resonant frequency of the piezoelectric crystal in the oscillator:
Crystal-controlled oscillator.
The only type of coupling the can amplify DC voltages as well as AC signals.
Direct coupling.
What does the power factor equal in an R-L circuit having a 45 degree phase angle between the voltage and the current?
.707
The unit of capacitive reactance is:
Ohm.
A ______ is two inductors separated by a core.
Transformer.
What is the description of a square wave?
A wave that abruptly changes back and forth between two voltage levels and stays at these levels for equal amounts of time.
AC generators used on heavy aircraft provide three-phase power at a frequency of ________Hz.
400.
For a sine wave, one-half cycle is often called:
Alternation.
In a series circuit, the individual resistor voltage drops are:
Proportional to the series resistance values.
Windings arranged in the shape of a triangle:
Delta Wound.
The impedance of a series LC circuit at resonance is?
Minimum.
A function expressing a relationship between variable input(s) to a system device and the resultant output.
Logic function.
What is the term for the out of phase power associated with inductors and capacitors?
Reactive power.
