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What will happen when an inductor's magnetic field collapses
Current will double.
A new field will expand.
Counter emf will be high.
Voltage will be induced.
What is the frequency of this 555 astable multivibrator
178 Hz
278 Hz
78 Hz
8 Hz
What is the reactive power
15.8 mW
12.8 mW
6.8 mW
9.8 mW
The total circuit power in the given circuit equals _____
4 µW
0 W
16 × 10–12 W
64 µW
When an input signal reduces the channel size, the process is called
Enhancement
depletion
gate charge
substrate connecting
As a generator armature passes the 270 degree point, the induced voltage is
between zero and maximum positive
between maximum negative and zero
at maximum positive
at maximum negative
At any resonant frequency, what net voltage is measured across the two series reactive components
Reactive voltage
zero voltage
VL + VC voltage
applied voltage
What is the voltage across the capacitor
7.07 V
7.07 mV
1.11 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
75 turns
900 turns
1920 turns
150 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
8 mA
12 mA
6 mA
If a calculator display was "0.00263," what would this answer be in percent
0.26%
26.3%
2.63%
0.026%
Which statement best describes reactance in a series RLC circuit
Resistance is always dominant.
Capacitive reactance is always dominant.
The larger of the two reactances is dominant.
Inductive reactance is always dominant.
At resonance, the term bandwidth includes all frequencies that allow what percentage of maximum current to flow
95.3
50
62.3
70.7
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
The coil ratio is too small.
coil 2
The unit designator for resistance value is the
watt
ohm
Ampere
volt
The four factors determining inductance are the number of turns, coil length, coil area, and
reluctance
Coefficient of coupling
counter emf
Permeability
Material that consists of a mixture of elements is considered to be
a compound
a molecule
an element
an ion
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%
45 V
30 V
40 V
26 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/time
joules x voltage
joules x charge
joules/work
1
2
19
37
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