Fcc Grol Element 3D

Front 1

3-29D1

What is the approximate magnitude of the impedance of a parallel R-L-C circuit at resonance?

Back 1

Approximately equal to the circuit resistance

Front 2

3-29D2

What is the approximate magnitude of the impedance of a series R-L-C circuit at resonance?

Back 2

Approximately equal to the circuit resistance

Front 3

3-29D3

How could voltage be greater across reactances in series than the applied voltage?

Back 3

Resonance

Front 4

3-29D4

What is the characteristic of the current flow in a series R-L-C circuit at resonance?

Back 4

Maximum

Front 5

3-29D5

What is the characteristic of the current flow within the parallel elements in a parallel R-L-C circuit at resonance?

Back 5

Maximum

Front 6

3-29D6

What is the relationship between current through a resonant circuit and the voltage across the circuit?

Back 6

The voltage and current are in phase

Front 7

3-30D1

What is the main advantage of using an op-amp audio filter over a passive LC audio filter?

Back 7

Op-amps exhibit gain rather than insertion loss

Front 8

3-30D2

What are the characteristics of an inverting operational amplifier (op-amp) circuit?

Back 8

It has input and output signals 180 degrees out of phase

Front 9

3-30D3

Gain of a closed-loop op-amp circuit is determined by?

Back 9

The op-amp’s external feedback network

Front 10

3-30D4

Where is the external feedback network connected to control the gain of a closed-loop op-amp circuit?

Back 10

From output to the inverting input

Front 11

3-30D5

Which of the following op-amp circuits is operated open-loop?

Back 11

Comparator

Front 12

3-30D6

In the op-amp oscillator circuit shown in Figure 3D6, what would be the most noticeable effect if the capacitance of C were suddenly doubled?

Back 12

Frequency would be lower

Front 13

3-31D1

What frequency synthesizer circuit uses a phase comparator, look-up table, digital-to-analog converter, and a low-pass antialias filter?

Back 13

A direct digital synthesizer

Front 14

3-31D2

A circuit that compares the output of a voltage-controlled oscillator (VCO) to a frequency standard and produces an error voltage that is then used to adjust the capacitance of a varactor diode used to control frequency in that same VCO is called what?

Back 14

Phase-locked loop

Front 15

3-31D3

RF input to a mixer is 200 MHz and the local oscillator frequency is 150 MHz. What output would you expect to see at the IF output prior to any filtering?

Back 15

50, 150, 200 and 350 MHz

Front 16

3-31D4

What spectral impurity components might be generated by a phase-locked-loop synthesizer?

Back 16

Broadband noise

Front 17

3-31D5

In a direct digital synthesizer, what are the unwanted components on its output?

Back 17

Spurs at discrete frequencies

Front 18

3-31D6

What is the definition of a phase-locked loop (PLL) circuit?

Back 18

A servo loop consisting of a phase detector, a low-pass filter and voltage-controlled oscillator

Front 19

3-32D1

Given the combined DC input voltages, what would the output voltage be in the circuit shown in Figure 3D7?

Back 19

-5.5 V

Front 20

3-32D2

Which lamps would be lit in the circuit shown in Figure 3D8?

Back 20

2, 3, 4, 7 and 8

Front 21

3-32D3

What will occur if an amplifier input signal coupling capacitor fails open?

Back 21

No amplification will occur, with DC within the circuit measuring normal

Front 22

3-32D4

In Figure 3D9, determine if there is a problem with this regulated power supply and identify the problem.

Back 22

There is no problem with the circuit

Front 23

3-32D5

In Figure 3D10 with a square wave input what would be the output?

Back 23

3

Front 24

3-32D6

With a pure AC signal input to the circuit shown in Figure 3D11, what output wave form would you expect to see on an oscilloscope display?

Back 24

2