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- Question
An audio transformer has a turn ratio of 9, What is its impedance ratio?
Options- A. 81
- B. 85
- C. 6
- D. 9
- E. None of the above
- Correct Answer
- 81
- 1. At room temperature an intrinsic semiconductor has
Options- A. a few free electrons and holes
- B. many holes
- C. many free electrons
- D. No holes
- E. None of the above Discuss
- 2. Which one of the following statements is true for the impedance of a series RC circuit?
Options- A. The impedance is greater than the sum of the resistance and capacitive reactance
- B. The impedance is equal to the sum of the resistance and capacitive reactance
- C. The impedance is greater than either the resistance or capacitive reactance but less than their sum
- D. The impedance is less than the sum of the resistance and capacitive reactance
- E. None of the above Discuss
- 3. Which one of the following is a statement of KirchhofFs voltage law?
Options- A. The total voltage in a parallel circuit is less than the value of the smallest voltage
- B. The algebraic sum of voltages in a loop is equal to zero
- C. The voltage drop across a resistance is proportional to the value of resistance and the amount of current flowing through it
- D. The algebraic sum of voltages entering and leaving a point is equal to zero
- E. None of the above Discuss
- 4. A zener diode has a voltage of 10 V and a current of 20 mA. What is the power dissipation?
Options- A. 200 mW
- B. 300 mW
- C. 20 mW
- D. 10 mW
- E. None of the above Discuss
- 5. Assuming 100% efficiency, what is the power being consumed at the secondary winding of the transformer described in question 91?
Options- A. 200 W
- B. 1000 W
- C. 20 W
- D. 100 W
- E. None of the above Discuss
- 6. Which one of the following is a statement of Kirchhoffs current law?
Options- A. The current through a resistance is proportional to the value of resistance and the IR drop across it
- B. The total current in a parallel circuit is less than the value of the smallest current
- C. The algebraic sum of currents in a loop is equal to zero
- D. The algebraic sum of currents entering and leaving a point is equal to zero
- E. None of the above Discuss
- 7. How much current flows through a 0.02 micro F capacitor that is operating from a 12-V ac, 100-Hz source?
Options- A. 0.151 mA
- B. 157 raA
- C. 0.995 mA
- D. 2.02 A
- E. None of the above Discuss
- 8. How many types of flow are there in a semiconductor?
Options- A. 0
- B. 1
- C. 2
- D. 4
- E. None of the above Discuss
- 9. How many protons does the nucleus of a silicon atom contain?
Options- A. 4
- B. 29
- C. 14
- D. 48
- E. None of the above Discuss
- 10. What is the turns ratio of a power transformer that shows 50 V at its secondary winding when you apply 150 V to its primary winding?
Options- A. 1/4
- B. 1/3
- C. 2
- D. 3
- E. None of the above Discuss
Electronic Principles problems
Search Results
Correct Answer: a few free electrons and holes
Correct Answer: The impedance is greater than either the resistance or capacitive reactance but less than their sum
Correct Answer: The algebraic sum of voltages in a loop is equal to zero
Correct Answer: 200 mW
Correct Answer: 200 W
Correct Answer: The algebraic sum of currents in a loop is equal to zero
Correct Answer: 0.151 mA
Correct Answer: 2
Correct Answer: 14
Correct Answer: 3
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