Elance Analog Electronics Test Answers 2015
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The
total capacitance is less than either of the individual capacitances.
The total
capacitance is greater than either of the individual capacitances.
The total
capacitance is the reciprocal of the larger of the two capacitances.
The total
capacitance is the ratio of the individual capacitances.
What is another name for a common collector amplifier?
collector
follower
emitter
buffer
base buffer
emitter
follower
What is the common-mode-rejection-ratio (CMRR) of an ideal op-amp?
Infinite
One
Zero
True or False? Incandescent light bulbs can only be used in alternating-current circuits.
True
False
Which of the following are appropriate units for impedance?
Z
Radians
Hertz
Ohms
When a series RLC circuit is driven at resonance, how does the impedance of the circuit compare to the resistance in the circuit?
The
impedance is equal to the amplitude.
The
impedance is equal to the resistance.
The
impedance is equal to the inductance.
The
impedance is equal to the reactance.
In an N-channel enhancement mode FET, the positive gate-source voltage required to form the depletion region and the conductive channel is called:
depletion
voltage
channel
voltage
pinch-off
voltage
threshold
voltage
Two inductors connected in series certainly have
the
same current
the same
reactance
the same
inductance
the same
impedance
A typical material used for capacitor leads is
bismuth
tinned
copper
silicon
carbon
What kind of semiconductor material is created by doping a silicon crystal with boron?
n-type
p-type
Which components form a Darlington pair?
One
BJT and one rectifier diode
One
rectifier diode and one Zener diode
Two
bipolar transistors
Two
rectifier diodes
In a circuit consisting of a battery in parallel with two identical parallel resistors, how do the currents through the two resistors compare?
The
same amount of current flows through each resistor.
More
current flows through one resistor than flows through the other.
Which of the following is true about the resistance in a "short circuit?"
A
short circuit has very little resistance.
A short
circuit has a great deal of resistance.
What is the open-loop gain of an ideal op-amp?
One
Zero
Infinite
True or False? Circuit elements in series always have the same current as each other.
True
False
In a series circuit consisting of a battery and two identical resistors, how do the currents through the two resistors compare?
More
current flows through one resistor than flows through the other.
The
same amount of current flows through each resistor.
Which of the following applications is a typical use for a transformer?
connecting
two branches of a circuit in parallel
changing
the capacitance of a capacitor to a different fixed value
changing
the voltage of an alternating-current signal
changing
the frequency of an alternating-current signal
For what purpose is a Zener diode normally used?
voltage
regulation
RF tuning
True or False: A photodiode connected in photoconductive mode has better response time than that connected in photovoltaic mode.
True
False
True or False: If a diode is forward biased, its P-type region is connected to the positive terminal of a battery.
True
False
What is the ratio of a transistor’s signal output to its signal input called?
Current
Response
Signal
Response
Impedance
Gain
Which is the correct way to connect a voltmeter with the circuit element being measured?
in
parallel
in series
What does MOSFET stand for?
Mono-oxide-substrate-field-effect-transistor
Metal-oxide-semiconductor-field-effect-transistor
Metal-oxide-substrate-functional-effect-transistor
Mono-oxide-semiconductor-field-effect-transistor
What is the difference between the upper and lower frequencies in a continuous set of frequencies called?
bandwidth
gain
phase
In what form is the energy stored in a charged capacitor?
The
energy is stored as an electric field.
The energy
is stored in a chemical paste.
The energy
is stored as a magnetic field.
The energy
is stored as a tensioned spring.
Under what physical conditions is magnetic energy stored in an inductor?
when
current is flowing through the inductor
any time
that the resistance is above a critical value
when a
static charge is present in the inductor
True or False? A variable inductor can only be constructed with the use of superconductors.
True
False
What is the forward voltage drop in a normal silicon diode?
6
– 7 volts
0.1 – 0.2
volts
1 – 2 volts
0.6
– 0.7 volts
Which of the following are appropriate units for electric potential?
Volts
Newtons
Amperes
Ohms
What is the name for a circuit that produces a repetitive signal like a square wave or sine wave?
attenuator
pattern
modulator
swing
circuit
oscillator
What is the term used for the process by which a diode converts alternating current into direct current?
Biasing
Filtering
Rectification
Resolution
A four-diode bridge may be used for
Full-wave
Rectification
Half-wave
Rectification
Which of the following physical arrangements is a simple example of a capacitor?
a
coil of insulated wire
two
parallel metal sheets
a braid of
copper strands
Which electronic component can be used to conduct current only in one direction?
inductor
diode
capacitor
resistor
Which of the following physical arrangements is a simple example of an inductor?
two
hinged gold leaves
two
parallel metal sheets
a
coil of insulated wire
Which of the following are appropriate units for capacitance?
Volts
Hertz
Ohms
Farads
Which is the correct way to connect an ammeter with the circuit element being measured?
in
parallel
in
series
Which of the following are appropriate units for current?
Farads
Ohms
Amperes
Volts
True or False? Current can only flow through a battery from the negative terminal to the positive terminal.
False
True
In which technique is the frequency of a carrier signal varied according to the amplitude of an information-bearing signal?
frequency
differentiation
frequency
modulation
amplitude
integration
amplitude
modulation
In a series circuit consisting of a battery and two resistors with different resistances, how do the currents through the two resistors compare?
More
current flows through one resistor than flows through the other.
The
same amount of current flows through each resistor.
What is the term for the maximum rate of change of output voltage of an op-amp?
pinch-off
rate
offset rate
breakdown
rate
slew
rate
How is the charge stored in a capacitor related to the voltage applied to the capacitor?
The
charge is independent of the applied voltage.
The charge
is inversely proportional to the appiled voltage.
The
charge is proportional to the applied voltage.
How does the total capacitance of two capacitors arranged together in parallel compare to the individual capacitances of each?
The
total capacitance is greater than either of the individual capacitances.
The total
capacitance is the ratio of the individual capacitances.
The total
capacitance is the reciprocal of the larger of the two capacitances.
The total
capacitance is less than either of the individual capacitances.
Two identical bulbs connected in parallel with each other and an ideal voltage supply glow _______ either one of the bulbs connected to the same supply by itself.
equally
brightly compared with
brighter
than
more dimly
than
Which of these is a terminal in a field effect transistor?
collector
drain
pole
base
Which of the following are appropriate units for electromotive force?
Newtons
Amperes
Ohms
Volts
In a series RLC alternating-current circuit, which element will dominate the reactance of the circuit when the frequency is above resonance?
the
inductor
the
capacitor
the resistor
In an alternating-current circuit, what is the relationship between the impedance of an inductor and the frequency of the current?
The
impedance decreases with frequency.
The
impedance is independent of frequency.
The
impedance increases with frequency.
Which of these has no P-N junctions?
Thermistor
BJT
Integrated
Circuit
Light
Emitting Diode
The voltage at which a Zener diode starts conducting when reverse biased is called:
Bias
Voltage
Reverse
Bias Point
Negative
Voltage
Breakdown
Voltage
The application of electric voltage to a P-N junction is known as:
Bias
Field Effect
Polarization
Transconduction
Compare the currents of these two circuits: (1) a battery connected in series with four identical series resistors and (2) the same battery connected to only three of the identical series resistors.
More
current flows in the circuit with three resistors.
More
current flows in the circuit with four resistors.
The same
amount of current flows in each of these circuits.
True or False? An analog circuit cannot function without a connection to earth ground.
False
True
What is the effect of a reverse bias on the depletion region of a diode?
There
is no effect.
It
increases in width.
It decreases
in width.
Which of the following statements is certainly true about two capacitors that have been charged in parallel?
Each
capacitor has the same voltage drop.
The same
amount of charge is stored in each capacitor.
The two
capacitors must have the same capacitances.
The two
capacitors must have the same reactances.
Which is the output terminal in a BJT connected in a common-emitter configuration?
gate
collector
base
emitter
In an alternating-current circuit, what is the relationship between the impedance of a resistor and the frequency of the current?
The
impedance is independent of frequency.
The
impedance decreases with frequency.
The
impedance increases with frequency.
What is the term used for the leakage current that flows through a photodiode when no photons are entering it?
Photocurrent
Dark
current
Depletion
current
Reverse
current
Which of these is a common application of a varactor diode?
Tuning
circuit
Rectification
Photodetection
Voltage
regulation
In a circuit with a resistor and an inductor in series with an alternating-current supply, how does is the phase of the current in the circuit related to the phase of the voltage of the supply?
The
current and voltage are in phase.
The current
leads the voltage.
The
current lags the voltage.
True or False: The ratio of visible light produced to power consumed is more for LEDs than for incandescent light bulbs.
True
False
Under ideal conditions, which input voltage does an op-amp amplify?
inverting
input voltage
non-inverting
input voltage
differential
input voltage
In a circuit with a capacitor and a resistor in series with an alternating-current supply, how does the phase of the current in the circuit related to the phase of the voltage of the supply?
The
current lags the voltage.
The current
and voltage are in phase.
The
current leads the voltage.
Which of these is NOT a method used for doping semiconductors?
Ion
Implantation
Etching
Diffusion
Epitaxy
In a series RLC alternating-current circuit, which element will dominate the reactance of the circuit when the frequency is below resonance?
the
resistor
the
capacitor
the inductor
Which of these devices has a rectifying metal-semiconductor junction?
Schottky
diode
Varactor
diode
Light
emitting diode
In an alternating-current circuit, what is the relationship between the impedance of a capacitor and the frequency of the current?
The
impedance is independent of frequency.
The
impedance decreases with frequency.
The
impedance increases with frequency.
Which of the following statements is certainly true about two capacitors that have been charged in series?
The
same amount of charge is stored in each capacitor.
The two
capacitors must have the same impedances.
The two
capacitors must have the same capacitances.
Each
capacitor has the same voltage drop.
What is the term used for a circuit in which, for a sinusoidal input with frequency f, any steady state output is also sinusoidal with frequency f?
Linear
circuit
Phased
circuit
Sinusoidal
circuit
Phase-looped
circuit
True or False: Zener breakdown and Avalanche breakdown can occur in the same diode.
True
False
When voltage across a varactor diode is varied, there is a change in its
Resistance
Inductance
Capacitance
True or False? A transformer requires a ferrite core.
False
True
In a real op-amp, the voltage required across the input terminals to drive the output to zero is called:
differential
input
biasing voltage
input
offset voltage
common mode
voltage
Compare the currents of these two circuits: (1) a battery connected in parallel with four identical parallel resistors and (2) the same battery connected to only three of the identical parallel resistors.
More
current flows in the circuit with four resistors.
More
current flows in the circuit with three resistors.
The same
amount of current flows in each of these circuits.
In an N-channel depletion mode FET, the negative gate-source voltage at which the depletion region expands to completely close the conductive channel is called:
pinch-off
voltage
threshold
voltage
depletion
voltage
channel
voltage
Two identical bulbs connected in series with an ideal voltage supply glow _______ either one of the bulbs connected to the same supply by itself.
brigher
than
equally
brightly compared with
more
dimly than
Which of these is used in the graphical analysis of non-linear circuits?
Load
line
Biasing
Curve
Kirchoff’s
line
What can be observed in a tunnel diode connected in forward bias?
Tunnel
Resistance
Negative
Resistance
Negative
Tunnelling
Avalanche
Breakdown
True or False: In a Class A amplifier 50% of the input signal is used - the active element carries current half of each cycle, and is turned off for the other half.
False
True
True or False: Schottky diodes have very high reverse recovery times compared to P-N diodes.
True
False
True or false: Doping a silicon crystal with phosphorous results in a p-type semiconductor.
True
False
What does a Q-point of a transistor indicate?
The
maximum input voltage the transistor can handle
The
collector-emitter current with maximum input
The
collector-emitter current with no input
The
base-emitter voltage
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