QUESTION 1 Copper is a good conductor. True False QUESTION 2 Doping is a process

Question

QUESTION 1 Copper is a good conductor. True False

QUESTION 2 Doping is a process of adding impurity atoms to an intrinsic crystal to alter its electrical conductivity. True False

QUESTION 3 You can quickly check the condition of a diode with an ohmmeter on a high resistance range. True False

QUESTION 4 The letter Q is an abbreviation for quiescent, which represents the AC signal is operating between cut-off and saturation points of the transistor. True False 3

QUESTION 5 The half-wave rectifier has a diode in parallel with a load resistor. True False

QUESTION 6 In an NPN transistor, the emitter and collector are both n-type materials. True False

QUESTION 7 The dc beta is also known as the current gain because a small base current controls a much larger collector current. True False

QUESTION 8 The load line is a visual summary of all the possible transistor operating points. True False

QUESTION 9 With the switch in the position as shown in Figure 1 below, the LED is on. True False

QUESTION 10 A transistor can be tested using an ohmmeter to check back and front resistances of emitter-base, collector-base, and collector-emitter. True False

QUESTION 11 Hard saturation refers to any design that makes the saturation current gain approximately: 1, 10, 100, or 1000

QUESTION 12 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 13 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 14 With normal circuit operation, Vout in Figure 2 is ________.

a. Approximately 0V

b.115 Vac

c.20 V

d.10 V DC

Explanation / Answer

Answer 1.

It is true that copper is a good conductor of heat and electricity. It is used in electric wires.

Answer 2.

It is true that doping is a process of adding impurity atoms to an intrinsic crystal to alter its electrical conductivity. It is used to exploit the properties of the set of elements which are called dopants.

Answer 3

It is true that the condition of a diode can be checked with an ohmmeter on a high resistance range.

Answer 4

It is true that the letter Q is an abbreviation for quiescent, which represents the AC signal is operating between cut-off and saturation points of the transistor.

Answer 5

It is false that the half wave rectifier has a diode in parallel with a load resistor. The half wave rectifier has a diode in series with a load resistor.

Answer 6

It is true that in an NPN transistor, the emitter and collector both are n-type materials.

Answer 7

It is false that dc beta is also known as the current gain because a small base current controls a much larger collector current.

Answer 8

It is true that the load line is visual summary of all possible transistor operating points.

Answer 9

Note: The figure is missing

Answer 10

It is true that a transistor can be tested using an ohmmeter to check back and front resistances of emitter-base, collector-base and collector emitter.

Answer 11:

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

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