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- Question
A transformer has a primary voltage of 120 V rms and a secondary voltage of 25 V rms. If the secondary current is 1A rms, what is the primary current?
Options- A. 7.8 mA
- B. 208 mA
- C. 200 mA
- D. 300 mA
- E. None of the above
- Correct Answer
- 208 mA
- 1. What is the capacitive reactance of a 0.1 micro F capacitor that is operating at 1000 Hz?
Options- A. less than 1 Ohm
- B. 1590 Ohm
- C. 312 Ohm
- D. 690 Ohm
- E. None of the above Discuss
- 2. A device that converts mechanical into electrical energy is?
Options- A. solar cell
- B. thermocouple
- C. chemical cell
- D. generator
- E. None of the above Discuss
- 3. The rise time of a pulse waveform is the time required for the voltage to rise:
Options- A. from zero to its rms value
- B. from zero to its peak value
- C. from 10% of the peak value to 70.7% of the peak value
- D. from 10% of the peak value to 90% of the peak value
- E. None of the above Discuss
- 4. A dielectric material is:
Options- A. a good conductor
- B. a good insulator
- C. a poor conductor of electrostatic fields
- D. a good conductor of magnetic fields
- E. None of the above Discuss
- 5. Which one of the following devices is most often used for measuring opposition to current flow in a circuit?
Options- A. Ammeter
- B. Voltmeter
- C. Ohmmeter
- D. Wattmeter
- E. None of the above Discuss
- 6. Which one of the following statements is true for current flowing in a parallel circuit?
Options- A. The amount of current flow through each branch of a parallel circuit can be different, depending on the resistance of each branch part and the amount of voltage applied to it
- B. The same current always flows through every part of a parallel circuit
- C. The total current in a parallel circuit is equal to the total voltage multiplied by the total resistance
- D. The total current in a parallel circuit is always less than the smallest amount of current
- E. None of the above Discuss
- 7. Suppose the zener diode has a breakdown voltage of 10 V and zener resistance of 8.5 W, what is the additional voltage when the current is 20 mA?
Options- A. 0.17 V
- B. 10.17 V
- C. 20 V
- D. 18.8 V
- E. None of the above Discuss
- 8. A high-pass filter:
Options- A. passes lower-frequency signals and reduces higher-frequency signals
- B. passes higher-frequency signals and reduces lower-frequency signals
- C. has no effect on ac signals
- D. increases the level of all frequencies by a significant amount
- E. None of the above Discuss
- 9. Indicate which of the following is not true about 4GL?
Options- A. 4GL does not support a high-level of screen interaction
- B. Many database management system packages support 4GLs
- C. A 4GL is a software tool which is written, possibly, in some third generation language
- D. All of the above Discuss
- 10. A translator which reads an entire programme written in a high level language and converts it into machine language code is:
Options- A. assembler
- B. translator
- C. compiler
- D. system software Discuss
Electronic Principles problems
Search Results
Correct Answer: 1590 Ohm
Correct Answer: generator
Correct Answer: from 10% of the peak value to 90% of the peak value
Correct Answer: a good insulator
Correct Answer: Ohmmeter
Correct Answer: The amount of current flow through each branch of a parallel circuit can be different, depending on the resistance of each branch part and the amount of voltage applied to it
Correct Answer: 0.17 V
Correct Answer: passes higher-frequency signals and reduces lower-frequency signals
Correct Answer: 4GL does not support a high-level of screen interaction
Correct Answer: compiler
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