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Electronic Principles problems
1. If a transistor operates at the middle of the load line, an increase in the current gain will move the Q point
Options
A. down
B. up
C. nowhere
D. off the load line
E. None of the above
Show Answer
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Correct Answer: up
2. Which one of the following statements is true for the voltages in a series RL circuit?
Options
A. The total voltages is equal to the sum of the voltages across the resistance and inductance
B. The voltage always has the same amplitude and phase for every part of the circuit
C. The total voltage is less than the sum of the voltages across the resistance and inductance
D. The total voltage lags the total current by less than 90
E. None of the above
Show Answer
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Correct Answer: The total voltage is less than the sum of the voltages across the resistance and inductance
3. Doubling the operating frequency of an inductive circuit:
Options
A. has no effect on the inductive reactance
B. doubles the amount of inductive reactance
C. multiplies the inductive reactance by 6.28
D. cuts the inductive reactance in half
E. None of the above
Show Answer
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Correct Answer: doubles the amount of inductive reactance
4. A circuit has two different voltage sources that are connected in a series-opposing form. If the sources are rated at 6 V and 9 V, what is the total source voltage?
Options
A. 3 V
B. 16 V
C. 7.5 V
D. 8 V
E. None of the above
Show Answer
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Correct Answer: 3 V
5. If a load resistance is 1 kW, a stiff voltage source has a resistance of
Options
A. At least 10 Ohm
B. less than 10 Ohm
C. More than 100 k Ohm
D. Less than 100 k Ohm
E. None of the above
Show Answer
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Discuss
Correct Answer: less than 10 Ohm
6. Positive ions are atoms that have
Options
A. Gained a proton
B. Lost a proton
C. Gained an electron
D. Lost an electron
E. None of the above
Show Answer
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Correct Answer: Lost an electron
7. What is the inductive reactance of a 0.1-H coil that is operating at 1000 Hz?
Options
A. 100 Ohm
B. Less than 1 Ohm
C. 628 Ohm
D. 444 Ohm
E. None of the above
Show Answer
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Correct Answer: 628 Ohm
8. A typical light switch in your home is a:
Options
A. knife switch
B. toggle switch
C. rotary switch
D. momentary push button switch
E. None of the above
Show Answer
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Discuss
Correct Answer: toggle switch
9. A device that converts thermal energy to electrical energy is called a:
Options
A. thermocouple
B. solar cell
C. chemical cell
D. piezoelectric devices
E. None of the above
Show Answer
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Discuss
Correct Answer: thermocouple
10. A power transformer steps 100 V down to 10 V. If the current in its primary winding is 2 A, what is the current in the secondary winding?
Options
A. 50 A
B. 12 A
C. 5 A
D. 20 A
E. None of the above
Show Answer
Scratch Pad
Discuss
Correct Answer: 20 A
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