Question 1

Which instrument cannot be used in the testing of a JFET?

Accepted Answer

A)  curve tracer 
B)  oscilloscope 
C)  watt meter 
D)  DMM 
A)  curve tracer 
B)  oscilloscope 
C)  watt meter 
D)  DMM C

Question 2

Transconductance tells us how effective the gate-source voltage is in controlling the source current.

Accepted Answer

A) True 
 B)False  False

Question 3

In order to produce a JFET,a manufacturer diffuses two areas of p-type semiconductor into the n-type semiconductor.

Accepted Answer

A) True 
 B)False  True

Question 4

A JFET is a symmetrical device at low frequencies since

Accepted Answer

A)  either end can act like a source or the drain. 
B)  either end can act like a source or the gate. 
C)  either end can act like a drain or the gate. 
D)  either end can act like the channel. 
A)  either end can act like a source or the drain. 
B)  either end can act like a source or the gate. 
C)  either end can act like a drain or the gate. 
D)  either end can act like the channel.

Question 5

With a JFET,the gate-source diode is

Accepted Answer

A)  always reverse-biased. 
B)  always forward-biased. 
C)  is connected to the drain voltage. 
D)  is connected to ground. 
A)  always reverse-biased. 
B)  always forward-biased. 
C)  is connected to the drain voltage. 
D)  is connected to ground.

Question 6

An entry shown on the data sheet that helps to determine the dc input resistance of a JFET is _________.

Accepted Answer

A)  IGSS 
B)  VGS 
C)  ID 
D)  RS 
A)  IGSS 
B)  VGS 
C)  ID 
D)  RS

Question 7

The current flowing from the JFET's source to drain must pass through what between the depletion layers?

Accepted Answer

A)  gate 
B)  ground 
C)  channel 
D)  base 
A)  gate 
B)  ground 
C)  channel 
D)  base

Question 8

The unit mho is the ratio of current to voltage and the modern unit for mho is the siemen.

Accepted Answer

A) True 
 B)False

Question 9

What is the breakdown voltage as listed on the drain curves shown in Figure 11-5?

Accepted Answer

A)  0 V 
B)  4 V 
C)  15 V 
D)  30 V 
A)  0 V 
B)  4 V 
C)  15 V 
D)  30 V

Question 10

Why is gate bias the worst method to bias a JFET in the active region?

Accepted Answer

A)  because the operating point is too unstable 
B)  because the operating point is too stable 
C)  because the Q point is at pinchoff 
D)  because the gate is forward biased 
A)  because the operating point is too unstable 
B)  because the operating point is too stable 
C)  because the Q point is at pinchoff 
D)  because the gate is forward biased

Question 11

A circuit that generates an ac signal is

Accepted Answer

A)  a rectifier. 
B)  an oscillator. 
C)  an oscilloscope. 
D)  a channel. 
A)  a rectifier. 
B)  an oscillator. 
C)  an oscilloscope. 
D)  a channel.

Question 12

What is the equivalent and modern unit for mho?

Accepted Answer

A)  ohm 
B)  farad 
C)  siemen 
D)  henry 
A)  ohm 
B)  farad 
C)  siemen 
D)  henry

Question 13

The JFET is a

Accepted Answer

A)  voltage-controlled device. 
B)  current-controlled device. 
C)  bipolar device. 
D)  nonlinear device. 
A)  voltage-controlled device. 
B)  current-controlled device. 
C)  bipolar device. 
D)  nonlinear device.

Question 14

A JFET circuit that converts a dc input voltage to a square-wave output is

Accepted Answer

A)  a regulator. 
B)  a chopper. 
C)  an inverter. 
D)  a rectifier. 
A)  a regulator. 
B)  a chopper. 
C)  an inverter. 
D)  a rectifier.

Question 15

What is unwanted disturbance superimposed on a useful signal?

Accepted Answer

A)  alternating current 
B)  harmonics 
C)  chassis 
D)  noise 
A)  alternating current 
B)  harmonics 
C)  chassis 
D)  noise

Question 16

The power supply for a JFET forces free electrons to flow from

Accepted Answer

A)  drain to source. 
B)  source to drain. 
C)  gate to source. 
D)  gate to drain. 
A)  drain to source. 
B)  source to drain. 
C)  gate to source. 
D)  gate to drain.

Question 17

A typical JFET has an input resistance of

Accepted Answer

A)  about 200 ohms. 
B)  about 2000 ohms. 
C)  about 200 kΩ. 
D)  about 200 MΩ. 
A)  about 200 ohms. 
B)  about 2000 ohms. 
C)  about 200 kΩ. 
D)  about 200 MΩ.

Question 18

To prevent unwanted changes in volume,most modern receivers use

Accepted Answer

A)  automatic frequency control. 
B)  automatic gain control. 
C)  faders. 
D)  woofers. 
A)  automatic frequency control. 
B)  automatic gain control. 
C)  faders. 
D)  woofers.

Question 19

Which amplifying device is preferred for most linear applications?

Accepted Answer

A)  FET 
B)  BJT 
C)  triode 
D)  magnetron 
A)  FET 
B)  BJT 
C)  triode 
D)  magnetron

Question 20

One of the most important pieces of information on the data sheet of a depletion-mode device is

Accepted Answer

A)  derating factor. 
B)  reverse breakdown. 
C)  maximum drain current. 
D)  minimum gate to source voltage. 
A)  derating factor. 
B)  reverse breakdown. 
C)  maximum drain current. 
D)  minimum gate to source voltage.

Exam 11: JFETS

Which instrument cannot be used in the testing of a JFET?

Transconductance tells us how effective the gate-source voltage is in controlling the source current.

In order to produce a JFET,a manufacturer diffuses two areas of p-type semiconductor into the n-type semiconductor.

A JFET is a symmetrical device at low frequencies since

With a JFET,the gate-source diode is

An entry shown on the data sheet that helps to determine the dc input resistance of a JFET is _________.

The current flowing from the JFET's source to drain must pass through what between the depletion layers?

The unit mho is the ratio of current to voltage and the modern unit for mho is the siemen.

What is the breakdown voltage as listed on the drain curves shown in Figure 11-5?

Why is gate bias the worst method to bias a JFET in the active region?

A circuit that generates an ac signal is

What is the equivalent and modern unit for mho?

The JFET is a

A JFET circuit that converts a dc input voltage to a square-wave output is

What is unwanted disturbance superimposed on a useful signal?

The power supply for a JFET forces free electrons to flow from

A typical JFET has an input resistance of

To prevent unwanted changes in volume,most modern receivers use

Which amplifying device is preferred for most linear applications?

One of the most important pieces of information on the data sheet of a depletion-mode device is

Introduction

Semoconductors

Diode Theory Key

Diode Circuits

Special-Purpose Diodes Key

BJT Fumdamentals

BJT Biasing

Basic BJT Amplifiers

Multistage,CC,and CB Amplifiers

Power Amplifiers

Mosfets

Thyristors

Frequency Effects

Differential Amplifiers

Operational Amplifiers

Negative Feedback

Linear OP AMP Circuits

Active Filters Key

Nonlinear Op-Amp Circuit Applications Key

Oscillators Key

Regulated Power Supplies Key

Filters