ELECTRONIC PRINCIPLES QUIZ

What is the barrier potential of a silicon diode at room temperature?

0.3V

2 m V per degree Celsius

0.7V

1 V

None of these

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Which one of the following statements applies to common auto batteries?

None of these

Auto batteries are primary wet-cell batteries

Auto batteries are primary dry-cell batteries

Auto batteries are secondary dry-cell batteries

Auto batteries are secondary wet-cell batteries

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Two diodes are in series. The first diode has a voltage of 0.75 V and the second has a voltage of 0.8 V. If the current through the first diode is 500 mA, what is the current through the second diode

12 mA

None of these

10 mA

14 mA

11 mA

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An unloaded zener regulator has a source voltage of 20 V, a series resistance of 330 W, and a zener voltage of 12 V, What is the Zener current?

None of these

24.2 mA

34.4 mA

68.4 mA

28.4 mA

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The saturation point is approximately the same as

cutoff point

upper end of the load line

None of these

infinity

lower end of the load line

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A certain electromagnet has 1000 turns of wire. How much current must flow through the coil in order to generate an mmf of 100 ampere-turns?

0.41666666666667

None of these

0.1 A

100 A

1000 A

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What is the difference between a conductor and an insulator?

An insulator has an excessive number of free electrons, while a conductor has a few free electrons or none at all

The difference between conductors and insulators depends on how they are used

A conductor allows current to flow much easier than an insulator does

None of these

An insulator allows current to flow much easier than a conductor does

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Household light bulbs have a given power rating, and they operate at 120 V. Which one of the following equations most directly provides the current rating of these light bulbs?

P = I2R

P = E2/R

I = P/E

P = IE

None of these

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Which one of the following statements is true for the voltages in a series RC circuit?

The voltage always has the same amplitude and phase for every part of the circuit

The total voltage is greater than the sum of the voltages across the resistance and capacitance

The total voltage is equal to the sum of the voltages across the resistance and capacitance

The total voltage is less than the sum of the voltages across the resistance and capacitance

None of these

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When the Q point moves along the load line, the voltage increases when the current

Stays the same

Can be any of above

None of these

Increases

Decreases

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