final pre class quiz set for Barker :(

Electronic noise is a random fluctuation in an electrical signal, a characteristic of ____ electronic circuits.

Noise generated by electronic devices varies greatly, as it can be produced by ___ effects.

Thermal noise is _____ in circuits above absolute-zero temperature (e.g. all ordinary circuits).

Except for thermal noise, the other types of noise depend on

Noise is considered

Noise and distortion are the same thing
True False

White noise refers to a statistical model for signals and signal sources, rather than to any specific signal.
True False

White noise sounds like (hear it on Wikipedia):

White noise on an oscilloscope looks like

Thermal noise exists in an electrical conductor ONLY when electrical current is not zero.
True False

Thermal noise exists in an electrical conductor when electrical current is zero.
True False

Thermal noise exists in an electrical conductor when electrical current is zero or not zero
True False

When the temperature is above absolute zero, thermal noise is

Thermal noise is generated by the random thermal motion of electrons, which happens regardless of any applied voltage.
True False

The theoretical model that closely approximates thermal noise is ____ noise.

There is no dominant frequency in white noise, because all frequencies are present simultaneously.
True False

Thermal noise _____ be reduced by cooling the circuit.

When two wires are close to each other, the signal in one wire can show up in the other.

Other types of noise that can show up in the maglev circuit include: industrial, atmospheric, and interfence such as power lines.
True False

Other types of noise that can show up in the maglev circuit include: solar, cosmic, and extraterrestial.
True False

For initial tuning, both P-pot and D-pot should be turned to

r initial tuning, ______ should be increased _____.

For initial tuning, the P-pot should be increased until the globe bounces off the hand

During levitation, the P-amplifier provides ____ and the D-amplifier provides ___.

Occasionally the globe continues to strike the magnet and bounce off. While bouncing, adjusting the P & D pots can halt this condition.
True False

For initial tuning, begin by holding the top of the globe ____ the balance line.

The levitation current is expected to be _____amps.

The levitation current magnitude depends mostly on the

The globe is constructed from

The electromagnet consists of _____ magnet wire.

The diode across the electromagnet protects the ______ from large voltage spikes when electromagnet current is halted abruptly.

The air gap is the distance between the balanced globe and bottom the electromagnet, and is adjusted by

The power transistor that regulates the electromagnet current is

Twisting the red/yellow/black wires from the power supply, instead of untwisted wires

Optimal orientation of heat-sink fins is

The maglev system is robust if it can withstand physical and electrical disturbances.
True False

e best way to monitor electromagnet current is with a

The opamps require ______ volts.

The photo diode and photo transistor require _____ volts.

If 15 volts is applied to the photo diode and photo transistor, they will be destroyed.
True False

Required wire colors are red for +15v; Yellow for -15v; Black for ground; & Green or Blue for 5v.
True False

The metal globe is lifted by

The magnetic field is controlled by

The globe position is sensed by an IR LED and IR transistor.
True False

As the globe is lifted higher, the IR-transistor current

As the IR transistor current increases, the voltage at F

Ideally, the voltage at A is ____ the voltage at F.

The maximum voltage at A will be approximately _____ volts.

The minimum voltage at A will be _____ volts.

If the voltage at A (V_A) is railed (i.e. approximately + or -15 volts), a problem is indicted in the ____ opamp.

While the globe is levitating, the ideal voltage V_A will be nearly ____ volts.

If the proportional potentiometer (P-pot) is 2k Ohms, and V_A=2 volts, V_B will be ____ volts.

If V_A is a steady 2 volts, then V_C will be _____ volts, independently of D-pot.

If V_A is increasing, then V_C will be ______voltage.

V_M will be nearly _____volts, which is independent of V_B and V_C.

The output of opamp-4 (V_D) is

If 15 volts is connected to the IR LED or IR transistor, the result will likely be failure of the IR LED or IR transistor.
True False

If R6 were zero Ohms (a wire), the differentiator would be an ideal differentiator.
True False

R6 is not zero, which makes opamp-3 a practical differentiator. A _____ can demonstrate that opamp-3 is only a differentiator at low frequency.

If 5 volts is connected across the IR LED, because R1 is omitted, the result will likely be failure of the IR LED.
True False

If red wires are used exclusively for +15 volts and yellow wires for -15 volts, debugging will be greatly facilitated.
True False

Fig 1400a indicates an open-loop transfer function (TF) of

Fig 1400a indicates an closed-loop transfer function (TF) of

The _____ is used to determine closed-loop gain margin (CLGM) and closed-loop phase margin (CLPM).

CLGM and CLPM are determined from the _____ of the open-loop transfer function

The CLGM is determine by the OL gain relative to the

The CLPM is determined by the OL phase relative to the

CLGM and CLPM can be observed most easily on the

The center of the Nichols plot

Desirable CLGM and CLPM in the aerospace industry is 10 dB (3.16) and 30 deg.
True False

The CL system will be marginally stable if the OL gain increases by the

e CL system will be unstable if the OL gain increases by more than the

The CL system will be marginally stable if a time delay exists in the loop corresponding to

The CL system will be unstable if more time delay exists in the loop corresponding to

The MATLAB function _____ draws the OL-system Bode plot and shows the CLGM and CLPM.

The MATLAB function nichols(n,d) draws the OL-system Nichols plot and shows the CLGM and CLPM.

The MATLAB function nichols(n,d) draws the OL-system Nichols plot and the CLGM and CLPM are easily visualized relative to the 0 dB and -180 deg point.
True False

The Nichols plot of the OL TF shows the frequency content just like the Bode plot.
True False

The vertical axis ______ of the Nichols plot is the same as one Bode plot axis.

The horizontal axis _______ of the Nichols plot is the same as one Bode plot axis.

TF=g. The gain of this transfer function (TF) is

TF=g. The phase is

TF=1/s. The gain is

TF=1/s. The phase is

TF=1+s/w1, which is a LEAD (not LAG) TF. The gain is

TF=1+s/w1, which is a LEAD (not LAG) TF. The gain is

TF=1+s/w1, which is a LEAD (not LAG) TF. The phase is

TF=1+s/w1, which is a LEAD (not LAG) TF. The phase is

TF=1/(1+s/w2), which is a lag TF. The gain is

TF=1/(1+s/w2), which is a lag TF. The gain is

TF=1/(1+s/w2), which is a lag TF. The phase is

TF=1/(1+s/w2), which is a lag TF. The phase is

TF=g is a ______ transfer function.

TF=1/s is a ______ transfer function.

TF=1+s/w1 is a ______ transfer function.

TF=1/(1+s/w1) is a ______ transfer function.

TF=s is a ______ transfer function.

TF=s. The gain is 20 dB/decade at all frequencies and has 0 dB gain at 1 rad/sec.
True False

TF=s. The phase is constant 90 deg at all frequencies.
True False

The total gain Bode asymptotic plot is the _____ of the components.

The total phase Bode asymptotic plot is the _____ of the components.

Asympotic Bode plots are

Deviations of asymptotic Bode plots from actual Bode plots occur at the

Asymptotic Bode plots can be sketched from the

The system TF must be written in _____ in order to manually sketch asymptotic Bode plots

G(s)=1/(s+a), and in Bode-plot form, G(s)=

G(s)=1/(s(s+a)), and in Bode-plot form, G(s)=

G(s)=1/((s+b)(s+a)), and in Bode-plot form, G(s)=

G(s)=1/(s^2+a*s+b), and in Bode-plot form, G(s)=

G(s)=(s+a)/(s+b), and in Bode-plot form, G(s)=

G(s) = a*(s+w1)

G(s) = a/(s+w1)

G(s) = a / ( (s+w1) * (s+w2) )

G(s) = a/(s^2 + b*s + w1^2)

G(s) = 1/s

G(s) = s

G(s) = exp(-a*s)

The first-order lead has a Bode-gain slope of _____ after the corner.

The first-order lag has a Bode-gain slope of _____ after the corner.

-20dB/decade

The second-order lag has Bode-gain slope of ____ after the corner

The delay has Bode-phase that _____ as frequency increases.

The delay TF has Bode-gain that _____ as frequency increases.

For a Bode phase of 85 degrees, and an input of A*sin(w*t), the output at that frequency would be

For a Bode gain of -20 dB, and an input of 30sin(w*t), the output at that frequency would be

For a Bode gain of -20 dB, the system numeric gain at that frequency is

Bode plots show output and input sine wave ratios at different frequencies.
True False

Bode plots show output and input sine wave ratios at different frequencies.
True False

Bode plots show how sine waves are affected by some linear system.
True False

The phase-Bode plot for a high-pass TF shows _____ phase at low frequency and ______ phase at high frequency.

The gain-Bode plot for a high-pass TF shows _____ gain at low frequency and ______ gain at high frequency.

The phase-Bode plots produced by MATLAB are

The gain-Bode plots produced by MATLAB are

Both gain and phase-Bode plots are ______ graphs.

Both gain and phase Bode-plots are ______ graphs.

In the gain and phase Bode plots, the _____ axes are different in both plots.

The Bode plot frequency axis is a

The Bode plot frequency axis is the

The bottom Bode plot is usually (like produced by MATLAB)

The top Bode plot is usually (like produced by MATLAB)

A Bode plot is

A Bode plot is a description of a