QUESTION 1 Hard saturation refers to any design that makes the saturation curren

Question

QUESTION 1

Hard saturation refers to any design that makes the saturation current gain approximately:

a      
1

b      
10

c      
100

d      
100

QUESTION 2

While testing a transistor with an ohmmeter, a high reverse/forward resistance ratio for the emitter-base and base-collector junctions indicates

a      
this transistor is good.

b      
this transistor is open and should be replaced.

c      
this transistor is shorted and should be replaced.

d      
this transistor is a small-signal amplifier.

QUESTION 3

A major advantage of an optocoupler is the:

a      
electrical isolation between input and output circuits.

b      
electrical connection between input and output circuits.

c      
higher gain.

d      
low cost of manufacturing the device.

QUESTION 4

What is the device that increases a transistor's power rating by reducing the internal heat faster?

a      
heater wire

b      
chassis

c      
grommet

d      
heat sink

QUESTION 5

Another name for diode offset voltage is:

a      
barrier potential

b      
ripple voltage

c      
surge voltage

d      
filtered voltage

QUESTION 6

The second approximation of a silicon diode is basically the:

a) the diode appears as a switch in series with a barrier potential of 0.7 V

b) the diode appears as a switch in parallel with a barrier potential of 0.7 V

c) the diode appears as a barrier potential of 0.4 V

d) the diode appears as a short circuit

QUESTION 7

What is the most popular and useful semiconductor material?

a      
silver

b      
Copper

c      
Aluminum

d      
Silicon

Explanation / Answer

Hard saturation refers to any design that makes the saturation current gain approximately:

from the definition of the Hard saturation :

Hard saturation refers to any design that makes the saturation current gain approximately 10

refer :

electronics prnciple 7th edition page number 234

2)

Typical forward and reverse resistances are insignificant.

The best indicator for showing whether a transistor is good or bad is the ratio of forward-to- reverse resistance. If the transistor you are testing shows a ratio of at least 30 to 1,

it is probably good. Many transistors show ratios of 100 to 1 or greater.

so the answer is a)

3)

A major advantage of an optocoupler is the:

The other main advantage of an opto-coupler is the capability to have the input and output at different potentials.

This is also called isolation but it means the two circuits can have different "earth rails" or 0v rails.

so the answer is c) electrical isolation between input and output circuits.

4)

What is the device that increases a transistor's power rating by reducing the internal heat faster?

The easiest way to increase the power rating of the transistor is get rid of the internal heat transfer.

Heat sink is the device which is used to reduce the internal heat transfer.

Heat sink is nothing but the mass of metal only.

so the answer is d) heat sink

5)

Another name for diode offset voltage is:

barrier potential

6)

The second approximation of a silicon diode is basically the:

first approximation : didoe as a short cicuit

second approximation : diode as a series combination of 0.7 V battery and switch

third approximation : didoe as series combination of resistance,0.7 V battery and switch.

the diode appears as a switch in series with a barrier potential of 0.7 V

so the answer is a)  the diode appears as a switch in series with a barrier potential of 0.7 V

7)

What is the most popular and useful semiconductor material?

silicon is the most commonaly used semiconductor material.

so answer is d) silicon

Silicon is widely used semiconductor for electronics, partly because it can be used at much higher temperatures than germanium and other semiconductor materials.

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