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What will happen when an inductor's magnetic field collapses
A new field will expand.
Counter emf will be high.
Voltage will be induced.
Current will double.
As a generator armature passes the 270 degree point, the induced voltage is
at maximum negative
between zero and maximum positive
at maximum positive
between maximum negative and zero
What is the number of turns required in the secondary winding for a transformer when 120 volts is applied to a 2400-turn primary to produce 7.5 Vac at the secondary
75 turns
1920 turns
150 turns
900 turns
Which coil would be used as a step-up transformer primary if coil number 1 has 100 more turns than coil number 2
coil 1
coil 2
The coil windings must be the same.
The coil ratio is too small.
The four factors determining inductance are the number of turns, coil length, coil area, and
reluctance
counter emf
Coefficient of coupling
Permeability
Faraday's law states that the
emf depends on the rate of cutting flux
emf is related to the direction of the current
direction of an induced current produces an aiding effect
direction of the induced voltage produces an opposition
What is the approximate time for a complete decay of 400 mA of inductor current, when R = 10 ohms and L = 20 H
2 seconds
4 seconds
8 Seconds
10 seconds
When a transformer secondary lead has been connected to a middle loop that is not an end connector, it is called a
single winding secondary
multiple-tapped secondary
center-tapped secondary
multiple winding secondary
The output phase for a transformer is
out of phase with the input
dependent on the direction of the primary and secondary windings
in phase with the input
dependent on the frequency of the primary source
What are the properties that determine the inductance of a coil
Type of core material, number of turns, cross-sectional area of core, and length of core
Length of wire, number of turns, type of core material, length of core
Number of turns, type of wire, length of core, and cross-sectional area of core
Type of core material, type of wire, number of turns, and cross-sectional area of core
Inductive ___ represents the opposition to an alternating current
reluctance
impedance
resistance
Reactance
Electromagnetism is the
action between a permanent and an artificial magnet
current in the coil
magnetic field caused by a permanent magnet
magnetic field action with a current-carrying wire
A winding of wire can be called
a coil
a choke
All of the above
an inductor
What is the permeability of machine steel
8.8 x 10−3
5.65 x 10−4
1.1 x 10−4
6.9 x 10−3
The unit of flux density is
a tesla
Magnetomotive force
a weber
a maxwell
A henry value divided by a circuit resistive value provides the
rise or decay time constant
induced voltage amplitude
counter emf value
quality factor of the coil
An inductor is in series with a voltage source, an open switch, and aresistor.
The instant the switch is closed, the inductor acts like
an open
a voltage source
a short
a resistor
What is the permeability of transformer iron
5,500
1,500
50
450
The inductive reactance of L2 is _____ in the given circuit
16.3 k
4.4 k
23.3 k
3.5 k
Find IR and IL
IR = 50 mA, IL = 151 mA
IR = 50 mA, IL = 109 mA
IR = 150 mA, IL = 9 mA
IR = 150 mA, IL = 53 mA
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