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Lesson 7 (ch 4 book)

Lesson 7

QuestionAnswer
A current-controlled, three-terminal semiconductor device used for the control and amplification of electronic circuitry is called a(n) Bipolar junction transistor
The relationship between the emitter current and the collector current in a BJT is called ? Alpha
At ? , the transistor passes nearly no current across E-C (like an open switchc Cutoff
During ? , B-E is forward biased and C-E is reverse biased Saturation
Which of the transistor configurations has a voltage phase reversal due to the collector voltage being 180° out of phase with the input base voltage? Select one: a. Common base b. Common collector c. Common emitter d. Emitter base Common emitter
In normal operation of the BJT type transistor, the B-E junction must be reverse biased, and the C-B junction must be forward biased TF False
What formula represents emitter current during normal operation? Ie=Ic+Ib
The ? is the most popular configuration, and application is universal Common Emitter
Beta is the amount of DC voltage gain in a transistor. It is a relationship between the DC collector voltage to DC base voltage. False Note: Beta is the amount of DC current gain in a transistor. It is a relationship between the DC collector current to DC base current
Which transistor configuration is very useful as an isolation amplifier and is often called an emitter follower? Select one: a. Common base b. Common collector c. Common emitter d. Emitter base Common collector
If the NPN transistor in the image was replaced with a PNP type, what changes to the circuit would be necessary b. The polarity of both power sources would have to be reversed
The PNP transistor is based on hole current where the NPN transistor is based on electron current TF TRUE
Why is the NPN transistor more widely used than the PNP a. Due to the NPN's popularity, it is less expensive. Incorrect b. Manufacturers have more NPN types to offer, which allows circuit designers better flexibility. Incorrect c. The NPN is based on negative ground, which is more common than positive ground systems d. All of the above. d. All of the above.
Collector characteristic curves indicate changes in base current with respect to changes in collector current. False
34.The two extremes of a load line are saturation and cutoff points. True
Which of the following methods can be used to prevent transistor thermal instability? I. Installation of a heat sink II. Use of a feedback circuit III. Use of a voltage divider circuit I., II., and III
What test instrument may be used to determine if a transistor is NPN or PNP type? A digital multimeter
When testing an NPN transistor with the ohmmeter leads connected (“ − Emitter” “+ Base”), one should be reading low resistance values. True
When testing an NPN transistor with the ohmmeter leads connected (“+ Emitter” “− Base”), one should be reading low resistance values. False
When testing an NPN transistor with the ohmmeter leads connected (“− Collector” “+ Base”), one should be reading low resistance values. True
When testing an NPN transistor with the ohmmeter leads connected (“+ Collector” “− Base”), one should be reading low resistance values. False
When testing an NPN transistor with the ohmmeter leads connected (“+ Collector” “− Emitter”), one should be reading low resistance values. False Because there is not a physical PN junction between the collector and the emitter, the resistance will always be very high regardless of the ohmmeter's polarity.
When testing an NPN transistor with the ohmmeter leads connected (“− Collector” “+ Emitter”), one should be reading low resistance values. Because there is not a physical PN junction between the collector and the emitter, the resistance will always be very high regardless of the ohmmeter's polarity.
Why is the NPN transistor more widely used than the PNP a. Due to the NPN's popularity, it is less expensive. b. Manufacturers have more NPN types to offer, which allows circuit designers better flexibility. c. The NPN is based on negative ground, which is more common than positive ground systems. d. All of the above d. All of the above
Created by: Shawnt321
 

 



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