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Semiconductors 2

Quiz for Lesson 1 Chapter 5 ( see courseware)

QuestionAnswer
1.Match the bipolar junction transistor (BJT) terminal to the similar junction field effect transistor (JFET) terminal name. I. Drain II. Gate III. Source Base Collector Emitter Drain=Collector, Gate=Base, Source=Emitter
2.The VDD supply for a P-channel JFET is negative. T/F True
3. The drain-to-source voltage, with a given gate voltage, beyond which drain current will increase no further Pinchoff Voltage
4. The N-channel JFET only requires electrons across the source-drain. T/F True
What are 4 basic types of JFTET biasing circuits? 1. Gate biasing 2. Self biasing 3.Voltage Divider Biasing 4. Current source biasing.
How is the gate width increased on a P-channel JFET? By applying reverse bias on the gate-source junction
6.Field effect transistors (FETs) require gate current for operation. T/F False
Under normal conditions, the gate source junction of a JFET is __________biased Vgg supplies the________ to the gate to ensure a reverse bias 1. Reverse 2.Voltage
_________________ biasing is the most stable biasing circuit. Current Source Biasing
7. Refer to LMS for Schematic
8.Refer to LMS for Schematic
The most common type of that is employed is ____________________ Biasing due to it's relative simplicity and stability. Voltage Divider
The most stable of the JFET biasing circuits it the_____________Biasing Current Source
9.There are important differences between the BJT and JFET transistors. For example, the bipolar device is voltage controlled, and the JFET is current controlled. False JFET is a VOLTAGE controlled device and the BJT is a Current controlled device
10.The BJT is normally 1. ON/OFF? and the JFET is normally 2.ON/OFF? 1. OFF 2. ON
Which of the following is a basic biasing circuit for the JFET? I. Gate -- Very similar to BJT base biasing II. Self -- VGG is replaced by a resistor III. Voltage Divider -- Stable using voltage divider concept IV. Current Source -- Most stable of all four I., II., III., and IV.
12.Most metal-oxide semiconductor field effect transistors (MOSFETs) have a(n) ? etched into their design to protect the thin insulation between the gate and the rest of the semiconductor. Zener diode
13.D-MOSFETs are usually used for analog applications such as ? . Select one: a. amplifiers b. oscillators c. regulators d. a. or b. e. a., b., or c. . d. a. or b.
14.The two basic types of MOSFETs are enhancement (E-MOSFET) and depletion (D-MOSFET). Select one: True False True
15.Refer to LMS for Schematic
16.Refer to LMS for Schematic
17.Which of the following is not one of the three leads of a MOSFET? Select one: a. Base b. Drain c. Gate d. Source a. Base
18.The Vertical Metal Oxide Semiconductor (VMOS) transistors do not have the limitations associated with power bipolar devices and are well suited for low power and low speed applications. Select one: True False False Note: The VMOS transistors do not have the limitations associated with power bipolar devices and are well suited for high power and high speed applications.
19.The unijunction transistor (UJT) is not used as an amplifier, but rather is used in ? circuits. switching
20. Refer to LMS for Schematic
21.e emitter of the UJT is a(n) ? material. P-type
22.The UJT transistor is not used as an amplifier. Select one: True False True
23.Which of the following is not one of the three leads on a UJT? Select one: a. Base 1 b. Base 2 c. Collector d. Emitter Collector
24.The VMOS operates only in enhancement mode. Select one: True False True
25. Refer to LMS for Schematic
26.Negative resistance is when any device has current and voltage values that are inversely related to each other. Select one: True False True
27. When the UJT’s ? is reached, the emitter/base-1 junction fires. peak voltage
28. The UJT will shut off when the ? current falls below a specific value called peak current. Emitter
29.Refer to LMS for Schematic
30. Refer to LMS for Schematic
31. Refer to LMS for Schematic
32. Normally the E-MOSFET is off, and the D-MOSFET is normally on. Select one: True False True
Created by: Shawnt321
 

 



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