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FET > FET MALVINO > Flashcards

FET MALVINO Flashcards

1
Q
  1. A JFET
    a. Is a voltage-controlled device
    b. Is a current-controlled device
    c. Has a low input resistance
    d. Has a very large voltage gain
A

a. Is a voltage-controlled device

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2
Q
  1. A unipolar transistor uses
    a. Both free electrons and holes
    b. Only free electrons
    c. Only holes
    d. Either one or the other, but
    not both
A

d. Either one or the other, but
not both

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3
Q
  1. The input impedance of a JFET
    a. Approaches zero
    b. Approaches one
    c. Approaches infinity
    d. Is impossible to predict
A

c. Approaches infinity

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4
Q
  1. The gate controls
    a. The width of the channel
    b. The drain current
    c. The gate voltage
    d. All of the above
A

d. All of the above

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5
Q
  1. The gate-source diode of a
    JFET should be
    a. Forward biased
    b. Reverse biased
    c. Either forward or reverse
    biased
    d. None of the above
A

b. Reverse biased

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6
Q
  1. Compared to a bipolar junction
    transistor, the JFET has a much
    higher
    a. Voltage gain
    b. Input resistance
    c. Supply voltage
    d. Current
A

b. Input resistance

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7
Q
  1. The pinchoff voltage has the
    same magnitude as the
    a. Gate voltage
    b. Drain-source voltage
    c. Gate-source voltage
    d. Gate-source cutoff voltage
A

d. Gate-source cutoff voltage

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8
Q
  1. When the drain saturation
    current is less than IDSS, a JFET
    acts like a
    a. Bipolar junction transistor
    b. Current source
    c. Resistor
    d. Battery
A

c. Resistor

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9
Q
  1. RDS equals pinchoff voltage
    divided by
    a. Drain current
    b. Gate current
    c. Ideal drain current
    d. Drain current for zero gate
    voltage
A

d. Drain current for zero gate
voltage

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10
Q
  1. The transconductance curve is
    a. Linear
    b. Similar to the graph of a
    resistor
    c. Nonlinear
    d. Like a single drain curve
A

c. Nonlinear

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11
Q
  1. The transconductance increases
    when the drain current
    approaches
    a. 0
    b. ID(sat)
    c. IDSS
    d. IS
A

c. IDSS

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12
Q
  1. A CS amplifier has a voltage
    gain of
    a. gmrd
    b. gmrs
    c. gmrs/(1 + gmrs)
    d. gmrd/(1 + gmrd)
A

a. gmrd

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13
Q
  1. A source follower has a voltage
    gain of
    a. gmrd
    b. gmrs
    c. gmrs/(1+ gmrs)
    d. gmrd/(1 + gmrd)
A

c. gmrs/(1+ gmrs)

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14
Q
  1. When the input signal is large,
    a source follower has
    a. A voltage gain of less than 1
    b. Some distortion
    c. A high input resistance
    d. All of these
A

d. All of these

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15
Q
  1. The input signal used with a
    JFET analog switch should be
    a. Small c. A square wave
    b. Large d. Chopped
A

a. Small

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16
Q
  1. A cascode amplifier has the
    advantage of
    a. Large voltage gain
    b. Low input capacitance
    c. Low input impedance
    d. Higher gm
A

b. Low input capacitance

17
Q
  1. VHF covers frequencies from
    a. 300 kHz to 3 MHz
    b. 3 to 30 MHz
    c. 30 to 300 MHz
    d. 300 MHz to 3 GHz
A

c. 30 to 300 MHz

18
Q
  1. When a JFET is cut off , the
    depletion layers are
    a. Far apart
    b. Close together
    c. Touching
    d. Conducting
A

c. Touching

19
Q
  1. When the gate voltage
    becomes more negative in an
    n-channel JFET, the channel
    between the depletion layers
    a. Shrinks
    b. Expands
    c. Conducts
    d. Stops conducting
A

a. Shrinks

20
Q
  1. If a JFET has IDSS 5 8 mA and
    VP 5 4 V, then RDS equals
    a. 200 V
    b. 320 V
    c. 500 ohms
    d. 5 kilo ohms
A

c. 500 ohms

21
Q
  1. The easiest way to bias a JFET
    in the ohmic region is with
    a. Voltage-divider bias
    b. Self-bias
    c. Gate bias
    d. Source bias
A

c. Gate bias

22
Q
  1. Self-bias produces
    a. Positive feedback
    b. Negative feedback
    c. Forward feedback
    d. Reverse feedback
A
23
Q
  1. To get a negative gate-source
    voltage in a self-biased JFET
    circuit, you must have a
    a. Voltage divider
    b. Source resistor
    c. Ground
    d. Negative gate supply voltage
A
24
Q
  1. Transconductance is measured
    in
    a. Ohms
    b. Amperes
    c. Volts
    d. Mhos or siemens
A
25
Q
  1. Transconductance indicates
    how eff ectively the input voltage
    controls the
    a. Voltage gain
    b. Input resistance
    c. Supply voltage
    d. Output current
A

FET (1 decks)

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