Electrical Engineering

Assume a feedback oscillator uses an inverting amplifier and a sample of the output is fed back. The ...

Assume a feedback oscillator uses an inverting amplifier and a sample of the output is fed back. The ...

Assume a feedback oscillator uses an inverting amplifier and a sample of the output is fed back. The feedback network needs to shift the phase

• 0°

• 180°

• 90°

• 270°

Tneary   94   3 Replies

5 / 5

ryann

A fiber optics cable does not have

A fiber optics cable does not have

A fiber optics cable does not have

a core

jacket

electromagnetic shielding

cladding

lizsmith   22   2 Replies

5 / 5

lizsmith

When a phase-locked loop is used as an FM demodulator, the output is the same as the

When a phase-locked loop is used as an FM demodulator, the output is the same as the

[html]Question 1.In general, the capture range of a PLL is

• equal to the lock range

• less than the lock range

• greater than the lock range

• dependent on the input signal frequencyQuestion 2.

mrive3127   15   1 Reply

peaceout3000

When a phase-locked loop is locked, the difference frequency (fi - f0) is

When a phase-locked loop is locked, the difference frequency (fi - f0) is

[html]Question 1.

spruckj   9   2 Replies

spruckj

Before a phase-locked loop (PLL) is locked the VCO is said to be

Before a phase-locked loop (PLL) is locked the VCO is said to be

[html]Question 1.

trancy   4   1 Reply

blazeypooh

In an AM receiver, the output signal from the IF amplifier will have

In an AM receiver, the output signal from the IF amplifier will have

[html]Question 1.In an AM receiver, the input signal to the IF amplifier will have

• local oscillator plus the modulated carrier

• local oscillator minus the modulated carrier

• both A and B

• only the modulation frequenci

lstar1993   7   2 Replies

lstar1993

To create the difference frequency in an AM mixer, the process uses

To create the difference frequency in an AM mixer, the process uses

[html]Question 1.In a balanced AM modulator there is

• only two sidebands

• a carrier and one sideband

• only one sideband

• a carrier and two sidebandsQuestion 2.To create the difference

tarasen57   4   1 Reply

mace

Amplitude modulation is essentially a

Amplitude modulation is essentially a

[html]Question 1.The process of modifying a high frequency carrier by a low frequency signal is called

• discrimination

• multiplexing

• modulation

• detectionQuestion 2.Amplitude modulati

Suedyso   5   3 Replies

aishasu

In a linear multiplier, the constant K is a number that is a(n)

In a linear multiplier, the constant K is a number that is a(n)

[html]Question 1.A linear four-quadrant multiplier can basically

• square a negative number by connecting the inputs together

• multiply any two signed numbers

• square a positive number by connecting the inputs together

•

justinw2200   7   1 Reply

austire

The purpose of AGC is to

The purpose of AGC is to

[html]Question 1.In an AM or FM receiver, the local oscillator is tuned to the

• IF frequency

• IF + modulation frequency

• carrier + IF frequency

• carrier frequencyQuestion 2.The purpose

Tneary   6   3 Replies

brigettelearn

Block diagram for an FM radio receiverRefer to Figure 2. The block with the ? represents the

Block diagram for an FM radio receiverRefer to Figure 2. The block with the ? represents the

[html]Question 1.

caillacakes   5   1 Reply

cuddahy99

The RF amplifier in both AM and FM receivers is tuned to

The RF amplifier in both AM and FM receivers is tuned to

[html]Question 1.To recover the audio from an AM signal, the receiver uses

• a discriminator

• a local oscillator

• AGC

• none of the aboveQuestion 2.The RF amplifier in both AM and FM rec

Migo7s   5   3 Replies

Mtoney9

Both AM and FM receivers have a

Both AM and FM receivers have a

[html]Question 1.Light is transmitted in a fiber optics system primarily by refraction.

• true

• falseQuestion 2.Both AM and FM receivers have a

• de-emphasis network

• local oscillator

•

dskmvld   4   1 Reply

Btllllll

Transmitting signals with fiber optics is faster than using solid wires.

Transmitting signals with fiber optics is faster than using solid wires.

[html]Question 1.In a phase-locked loop, the phase-detector output is an error voltage.

• true

• falseQuestion 2.Transmitting signals with fiber optics is faster than using solid wires.

• t

zmudasam   6   3 Replies

zachcarytcris

The output of an AM demodulator is only the audio signal.

The output of an AM demodulator is only the audio signal.

Question 1.In a single-sideband system there is a carrier and one sideband.

• true

• falseQuestion 2.The output of an AM demodulator is only the audio signal.

• true

• false

achalmers   8   1 Reply

curtissxx9

In an FM receiver, recovery of the signal is done with the limiter.

In an FM receiver, recovery of the signal is done with the limiter.

[html]Question 1.In an AM receiver, the AGC signal is sent to the audio amplifiers.

• true

• falseQuestion 2.In an FM receiver, recovery of the signal is done with the limiter.

• true

• fa

SPP24   5   2 Replies

SPP24

In an AM receiver, the local oscillator generates a 455 kHz frequency.

In an AM receiver, the local oscillator generates a 455 kHz frequency.

[html]Question 1.In an AM receiver, the IF amplifier is designed for a single frequency.

• true

• falseQuestion 2.In an AM receiver, the local oscillator generates a 455 kHz frequency.

• tr

Kaevyn04   5   1 Reply

austire

Of the following types, the most efficient regulator is a(n)

Of the following types, the most efficient regulator is a(n)

[html]Question 1.

Skizzle234   6   2 Replies

Skizzle234

Refer to Figure 5. The purpose of Qext and Rext is to

Refer to Figure 5. The purpose of Qext and Rext is to

[html]Question 1.The ADP1612/ADP1613 IC switching regulator has 2 selectable switching frequencies. The higher frequency is selected for

• higher efficiency

• greater output voltage range

• smaller external components

• al

mdagenh1   4   1 Reply

Omama

An LM 337 is

An LM 337 is

[html]Question 1.To regulate properly, the input voltage to a 7805 must be equal or greater than

• 7.5 V

• 5.5 V

• 6.5 V

• 10.0 VQuestion 2.An LM 337 is

• an adjustable positive output re

autumnnelson123   3   2 Replies

autumnnelson123

Refer to Figure 4. The capacitor is supplying current to the load

Refer to Figure 4. The capacitor is supplying current to the load

[html]Question 1.

linhhh   5   1 Reply

Cele_1015

Refer to Figure 4. The type of regulator is a

Refer to Figure 4. The type of regulator is a

[html]Question 1.

daniellasousa   6   3 Replies

Jennyyy

Assume ideal components.Refer to Figure 3. Assume the regulator is 80% efficient when VIN ...

Assume ideal components.Refer to Figure 3. Assume the regulator is 80% efficient when VIN ...

[html]Question 1.

tlc_71111   6   1 Reply

gdchavis1

Assume ideal components.Refer to Figure 3. Assume VIN can vary between +15 V and +18 V. To ...

Assume ideal components.Refer to Figure 3. Assume VIN can vary between +15 V and +18 V. To ...

[html]Question 1.Shunt regulators are

• simple

• efficient

• electrically noisy

• all of the aboveQuestion 2.

wrightjb   5   2 Replies

wrightjb

Refer to Figure 2. Assume the input increases by 0.45 V. As a result, the current in Q1 will ...

Refer to Figure 2. Assume the input increases by 0.45 V. As a result, the current in Q1 will ...

[html]Question 1.

autumnnelson123   5   1 Reply

mcwieck

Refer to Figure 2. If the load voltage drops, the voltage across R4 will ________ and the ...

Refer to Figure 2. If the load voltage drops, the voltage across R4 will ________ and the ...

[html]Question 1.

daniellasousa   3   3 Replies

yesimshay

Refer to Figure 2. The output voltage is approximately

Refer to Figure 2. The output voltage is approximately

[html]Question 1.Foldback current limiting differs from normal current limiting in that excessive output current will

• shut off the power supply

• reduce the output current limit

• be shunted to ground by the current limit

Yeeeee89   4   1 Reply

peaceout3000

Refer to Figure 1. If R2 is replaced with a short (0 ), the output voltage will be

Refer to Figure 1. If R2 is replaced with a short (0 ), the output voltage will be

[html]Question 1.

lbelcher   4   2 Replies

lbelcher

Refer to Figure 1. Current limiting is at an output current of

Refer to Figure 1. Current limiting is at an output current of

[html]Question 1.

CroweN6459   7   1 Reply

linds

The current sensor for a current limiting circuit is a

The current sensor for a current limiting circuit is a

[html]Question 1.A 12 V power supply has ROUT of 20 mΩ at a maximum current of 1.5 A. The load regulation is

• 0.5%

• 0.25%

• 0.75%

• none

JisselFlores   4   2 Replies

JisselFlores

A regulator output changes from +12.1 V with no load to +11.9 V at the rated current of 2.0 A. The ...

A regulator output changes from +12.1 V with no load to +11.9 V at the rated current of 2.0 A. The ...

[html]Question 1.A 7912 regulator has an output of +12 V.

• true

• falseQuestion 2.A regulator output changes from +12.1 V with no load to +11.9 V at the rated current of 2.0 A. The load reg

dupoyjohn134   31   1 Reply

5 / 5

whoohoo8

Linear regulators do not require a pulse width modulator.

Linear regulators do not require a pulse width modulator.

Question 1.Switching regulators can step-up, step down, or invert the output.

• true

• falseQuestion 2.Linear regulators do not require a pulse width modulator.

• true

• false

Nicpico   6   3 Replies

aishasu

A shunt regulator does not use negative feedback.

A shunt regulator does not use negative feedback.

Question 1.High temperature can change the output of a regulated power supply.

• true

• falseQuestion 2.A shunt regulator does not use negative feedback.

• true

• false

melinoma86   7   1 Reply

5 / 5

whoohoo8

The VREF of a series regulator must be equal to VOUT.

The VREF of a series regulator must be equal to VOUT.

[html]Question 1.An ideal power supply has a Thevenin resistance of zero ohms.

• true

• falseQuestion 2.The VREF

anthonydel117   4   2 Replies

anthonydel117

Ideally, line regulation is 100%.

Ideally, line regulation is 100%.

[html]Question 1.

tlc_71111   10   1 Reply

Jlynn

Refer to Figure 6. The circuit can be configured as a VCO by applying

Refer to Figure 6. The circuit can be configured as a VCO by applying

[html]Question 1.

gcd99br   3   2 Replies

gcd99br

Refer to Figure 6. The output is a

Refer to Figure 6. The output is a

[html]Question 1.

emyleepatton   4   1 Reply

Cele_1015

Refer to Figure 5. The output of this circuit is a

Refer to Figure 5. The output of this circuit is a

[html]Question 1.

trea48   3   2 Replies

trea48

Refer to Figure 4. The two outputs are a

Refer to Figure 4. The two outputs are a

[html]Question 1.An Armstrong oscillator

• uses 3 capacitors in the feedback circuit

• uses a "tickler coil" in the feedback loop

• is the most widely used of high-frequency oscillators

• uses a tapped inductor to generate

DragoxCM16   5   1 Reply

5 / 5

Dogggg

A simplified oscillator circuit. Refer to Figure 3. If the inductor is changed for one ...

A simplified oscillator circuit. Refer to Figure 3. If the inductor is changed for one ...

[html]Question 1.

lmalma   5   2 Replies

lmalma