Studied by 22 peopleWhich of the following is not an example of an electromagnetic device?
Resistor
The formula for calculating total parallel capacitance is
• CT = C1 + C2 + C3.
Which of the following is the correct formula for calculating total series inductance?
LT = L1 + L2 + L3.
A common inductor found in fluorescent light fixtures is a
Ballast
The apparent resistance to AC by a capacitor is called
Capacitive reactance
A coil that opposes any change in current flow is called a(n)
Inductor
Which of the following is the correct formula for calculating total parallel inductive reactance in a parallel circuit?
XLT = 1/[(1/XL1) + (1/XL2) + (1/XL3)..]
The energy stored by a capacitor is called a(n)
Electrostatic charge
affects a DC circuit only when the current is first turned on, turned off, or when there is a change in the load resistance.
Inductance
Capacitance is measured in
The resistance provided by an inductor in an AC circuit is called
Inductive reactance
Capacitance is measured in
Farads
One of the effects a capacitor has in a DC circuit is that it will
Charge to a voltage equal to the source voltage
A time-delay relay that uses an RC timing circuit is called a(n)
Solid-state, time-delay relay
In a power supply that converts an AC input to generate a DC output, a capacitor is commonly used to
Filter the rectifier's pulsating DC output
Inductance is measured in
Henrys
Which of the following is the total series capacitive reactance formula?
XCT = XC1 + XC2 + XC3.
Which of the following is a type of capacitor?
Electrolytic
Nonpolarized
Variable
The concept of a magnetic field being formed around a conductor when current flows through it is called
Electromagnetism
A circuit that uses resistors to produce a voltage that is lower than the source voltage is called a
Voltage divider
In a series-parallel circuit, components that are connected in parallel will display characteristics of a(n)
Parallel circuit
In order to identify the series and parallel sections of a combination circuit,
Trace the current path
In order for a firm voltage divider to operate properly, the load resistance value should be at least the voltage divider bleeder resistor.
10
Which of the following is not one of the seven general steps for solving a combination circuit?
Calculate the RC time constant.
Which of the following is NOT a step for troubleshooting a parallel circuit to find a short?
Disconnect the power supply.
O Look for visible signs of damage.
Connect an ohmmeter across the main ine
O All of the above
© None of the above <——- awnser
Which of the following is an application of a variable resistor?
Radio volume controls
O Television controls
O Dim lighting
A short circuit in the branch of a parallel circuit will
Cause an excessive amount of current to flow
Damage or destroy the power supply
Cause a short circuit across the power supply
What is the result when a branch of a parallel circuit has an open?
The rest of the circuit will operate but with a reduced total current
Which of the following is an application of a combination circuit?
Commercial building's lights
Electrical outlets controlled by a switch
Ceiling fan control
Which of the following is not a component of a transformer?
Plate
A common application of a center tap on the secondary of a transformer is a(n)
Distribution transformer
is an electrical device that converts AC electricity from one voltage level to another.
Transformer
In order to calculate the output voltage of a transformer, divide the input voltage by the
Tums ratio
Transformers are usually rated in units called
Volt Amperes
The power relationship on a transformer states that
Power in = power out + loss
The current load of a transformer is the current drawn by the
Primary winding itself
Which type of transformer is commonly used to reduce line voltages of 240 VAC or 480 VAC to 120 VAC?
Control transformer
Which of the following is a method to troubleshoot a transformer?
Measuring the continuity of the coils
Which of the categories of transformers uses only one coil for the primary and secondary?
Autotransformer
Note
Flashcard