What is the barrier potential of a silicon diode at room temperature?
A. 0.7V
B. 0.3V
C. 1 V
D. 2 m V per degree Celsius
E. None of the above
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The Norton current is sometimes called the
A. Shorted-load current
B. Open-load current
C. Thevenin current
D. Thevenin voltage
E. None of the above
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At room temperature a conductor has low many holes?
A. Same number as free electrons
B. many
C. Only those produced by thermal energy
D. less than the free electrons
E. None of the above
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A current source has an internal resistance of 100 kW. What is the largest load resistance if the current source must appear stiff?
A. 2 k Ohm
B. 10 k Ohm
C. 20 k Ohm
D. 1 k Ohm
E. None of the above
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When the Q point moves along the load line, the voltage increases when the current
A. Decreases
B. Stays the same
C. Increases
D. Can be any of above
E. None of the above
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What is the smallest number of polarities required for current flow?
A. One - a negative terminal
B. Two - a negative terminal and a positive terminal
C. Three - negative, positive and neutral terminals
D. Four - two negative and two positive
E. None of the above
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A diode is in series with 220W. If the voltage across the resister is 4V, what is the current through the diode?
A. 55 A
B. 55.86 A
C. 18.2 mA
D. 16.3 mA
E. None of the above
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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
A. 11 mA
B. 12 mA
C. 10 mA
D. 14 mA
E. None of the above
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The graph of current gain versus collector current indicates that the current gain
A. varies enormously
B. is contant
C. varies slightly
D. equals the collector current divided by the base current
E. None of the above
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Which one of the following statements is true for the currents in a parallel RL circuit?
A. The total current is equal to the sum of the currents through the resistance and inductance
B. The current always has the same amplitude and phase for every part of the circuit
C. The total current is less than the sum of the currents through the resistance and inductance
D. The total current leads the total voltage by less than 90
E. None of the above
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What is the impedance of a circuit composed of a 100 ohm resistor connected in parallel with an inductor that has a reactance of 200 W?
A. 77.7 ohm
B. 89.3 ohm
C. 88.8 ohm
D. 224 ohm
E. None of the above
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The nucleus of the copper atom contains how many protons?
A. 1
B. 4
C. 18
D. 29
E. None of the above
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Which one of the following statements is true for voltage in a series circuit?
A. The total voltage is equal to the sum of the individual voltages in a series circuit
B. The total voltage in a series circuit is equal to the average value of the individual voltages
C. The total voltage of a series circuit is equal to the total current divided by the total resistance
D. The total voltage in a series circuit is always less than the value of the smallest voltage
E. None of the above
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A basic capacitor is composed of:
A. two conductors separated by a dielectric
B. two dielectrics separated by a conductor
C. two coils separated by a dielectric
D. two coils separated by a conductor
E. None of the above
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Which one of the following devices is most often used for measuring electrical potential difference?
A. Voltmeter
B. Ohmmeter
C. Ammeter
D. Wattmeter
E. None of the above
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Which one of the following equations most directly determines the power dissipation of a resistance when you know the voltage drop and amount of resistance?
A. P = I2 R
B. P = IE
C. P = E2 /R
D. I = P/E
E. None of the above
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The equivalent of 1 megohms is:
A. 1 k ohm
B. 100,000 ohm
C. one-millionth of an ohm
D. one million ohms
E. None of the above
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Which one of the following equations most directly determines the amount of current flowing through a resistor when you know the value of the resistor and the voltage drop across it?
A. E = PR
B. E = I2 R
C. I = E/R
D. I = ER
E. None of the above
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Suppose a current source has an Ideal current of 10 mA and an internal resistance of 20 MW. For what values of load resistance will the current source appear stiff?
A. 20 k Ohm or more
B. 200 k Ohm or less
C. 200 k Ohm or more
D. 20 km or less
E. None of the above
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If the current gain is 200 and the collector current is 100 mA, the base current is
A. 2 mA
B. 0.5 mA
C. 2:00 AM
D. 200 A
E. None of the above
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