Computer Science - Electronic Principles
Exercise :: Electronic Principles - Section 3
| 1. |
Which one of the following statements is true for the voltages in a series RL circuit? |
| 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 |
Answer: Option C
Explanation:
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| 2. |
The core of an electromagnet is said to be in saturation when: |
| A. |
the core is permitted to move freely within the coil | | B. |
an increase in current through the coil causes no further increase in the mmf | | C. |
frequent changes in the direction of current through the coil causes heating effects in the core material | | D. |
changing the polarity of the current in the coil changes the polarity of the magnetic field around the core | | E. |
None of the above |
Answer: Option B
Explanation:
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| 3. |
As the temperature increases, the current gain |
| A. |
increases | | B. |
decreases | | C. |
contant | | D. |
can be any of the above | | E. |
None of the above |
Answer: Option A
Explanation:
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| 4. |
Assuming 100% efficiency, what is the power being consumed at the secondary winding of the transformer described in question 91? |
| A. |
200 W | | B. |
1000 W | | C. |
20 W | | D. |
100 W | | E. |
None of the above |
Answer: Option A
Explanation:
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| 5. |
Doubling the diameter of the coil in an inductor: |
| A. |
multiplies the value of inductance by two | | B. |
reduces the value of inductance by one-half | | C. |
reduces the value of inductance by one-fourth | | D. |
multiplies the value of inductance by four | | E. |
None of the above |
Answer: Option A
Explanation:
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