Q.1

With a JFET, a ratio of output current change against an input voltage change is called:

  • transconductance
  • siemens
  • resistivity
  • gain
Q.2

The common-source JFET amplifier has:

  • a very high input impedance and a relatively low voltage gain
  • a high input impedance and a very high voltage gain
  • a high input impedance and a voltage gain less than 1
  • no voltage gain
Q.3

In an n-channel JFET, what will happen at the pinch-off voltage?

  • the value of VDS at which further increases in VDS will cause no further increase in ID
  • the value of VGS at which further decreases in VGS will cause no further increases in ID
  • the value of VDG at which further decreases in VDG will cause no further increases in ID
  • the value of VDS at which further increases in VGS will cause no further increases in ID
Q.4

In the constant-current region, how will the IDS change in an n-channel JFET?

  • As VGS decreases ID decreases.
  • As VGS increases ID increases.
  • As VGS decreases ID remains constant.
  • As VGS increases ID remains constant.
Q.5

Which JFET configuration would connect a high-resistance signal source to a low-resistance load?

  • source follower
  • common-source
  • common-drain
  • common-gate
Q.6

Junction Field Effect Transistors (JFET) contain how many diodes?

  • 4
  • 3
  • 2
  • 1
Q.7

With the E-MOSFET, when gate input voltage is zero, drain current is:

  • at saturation
  • zero
  • IDSS
  • widening the channel
Q.8

Which type of JFET bias requires a negative supply voltage?

  • feedback
  • source
  • gate
  • voltage divider
Q.9

The overall input capacitance of a dual-gate D-MOSFET is lower because the devices are usually connected:

  • in parallel
  • with separate insulation
  • with separate inputs
  • in series
Q.10

A MOSFET has how many terminals?

  • 2 or 3
  • 3
  • 4
  • 3 or 4
Q.11

IDSS can be defined as:

  • the minimum possible drain current
  • the maximum possible current with VGS held at –4 V
  • the maximum possible current with VGS held at 0 V
  • the maximum drain current with the source shorted
Q.12

How will electrons flow through a p-channel JFET?

  • from source to drain
  • from source to gate
  • from drain to gate
  • from drain to source
Q.13

When an input delta of 2 V produces a transconductance of 1.5 mS, what is the drain current delta?

  • 666 mA
  • 3 mA
  • 0.75 mA
  • 0.5 mA
Q.14

With a 30-volt VDD, and an 8-kilohm drain resistor, what is the E-MOSFET Q point voltage, with ID = 3 mA?

  • 6 V
  • 10 V
  • 24 V
  • 30 V
Q.15

How will a D-MOSFET input impedance change with signal frequency?

  • As frequency increases input impedance increases.
  • As frequency increases input impedance is constant.
  • As frequency decreases input impedance increases.
  • As frequency decreases input impedance is constant.
Q.16

What is the input impedance of a common-gate configured JFET?

  • very low
  • low
  • high
  • very high
Q.17

When VGS = 0 V, a JFET is:

  • saturated
  • an analog device
  • an open switch
  • cut off
Q.18

When not in use, MOSFET pins are kept at the same potential through the use of:

  • shipping foil
  • nonconductive foam
  • conductive foam
  • a wrist strap
Q.19

To get a negative gate-source voltage in a self-biased JFET circuit, you must use a ________.

  • negative gate supply voltage
  • ground
  • voltage divider
  • source resistor
Q.20

When an input signal reduces the channel size, the process is called:

  • enhancement
  • substrate connecting
  • gate charge
  • depletion
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