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What will happen when an inductor's magnetic field collapses
Counter emf will be high.
A new field will expand.
Voltage will be induced.
Current will double.
What is the frequency of this 555 astable multivibrator
278 Hz
178 Hz
8 Hz
78 Hz
What is the reactive power
12.8 mW
15.8 mW
6.8 mW
9.8 mW
The total circuit power in the given circuit equals _____
16 × 10–12 W
64 µW
4 µW
0 W
When an input signal reduces the channel size, the process is called
substrate connecting
depletion
gate charge
Enhancement
As a generator armature passes the 270 degree point, the induced voltage is
at maximum negative
at maximum positive
between maximum negative and zero
between zero and maximum positive
At any resonant frequency, what net voltage is measured across the two series reactive components
applied voltage
VL + VC voltage
Reactive voltage
zero voltage
What is the voltage across the capacitor
1.11 V
7.07 mV
7.07 V
111 mV
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
1920 turns
900 turns
150 turns
75 turns
If a 1 k and a 2 k resistor are parallel-connected across a 12 V supply, how much current is received by the 2 k resistor
4 mA
12 mA
8 mA
6 mA
If a calculator display was "0.00263," what would this answer be in percent
2.63%
0.26%
26.3%
0.026%
Which statement best describes reactance in a series RLC circuit
Inductive reactance is always dominant.
The larger of the two reactances is dominant.
Resistance is always dominant.
Capacitive reactance is always dominant.
At resonance, the term bandwidth includes all frequencies that allow what percentage of maximum current to flow
62.3
70.7
50
95.3
Which coil would be used as a step-up transformer primary if coil number 1 has 100 more turns than coil number 2
The coil windings must be the same.
coil 1
coil 2
The coil ratio is too small.
The unit designator for resistance value is the
Ampere
volt
watt
ohm
The four factors determining inductance are the number of turns, coil length, coil area, and
Coefficient of coupling
Permeability
reluctance
counter emf
Material that consists of a mixture of elements is considered to be
a molecule
a compound
an ion
an element
What is the average voltage when a rectangular wave's base line voltage is 20 V, its peak-to-peak voltage is 50 V, and its duty cycle is 20%
26 V
40 V
30 V
45 V
In the given circuit, Channel 1 of the stereo amplifier outputs 12 V to thespeakers.
How much total current is the amplifier providing to the speakers
3 A
1.5 a
More information is needed to find the total current provided to the speakers.
0 A
Power is measured in units of
joules/work
joules x charge
joules/time
joules x voltage
1
2
19
37
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