Computer Science - Electronic Principles

11. 

What is the impedance of a circuit composed of a 100 ohm resistor connected in parallel with a capacitor that has a reactance of 100 ohm?

A. 60 Ohm
B. 99.3 Ohm
C. 250 Ohm
D. 70.7Ohm
E. None of the above

Answer: Option D

Explanation:

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12. 

Current can flow through a normally open push button switch as long as:

A. you are pressing the button
B. you are not pressing the button
C. its contact remain open
D. its contact remain open
E. None of the above

Answer: Option B

Explanation:

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13. 

Doubling the operating frequency of a purely capacitive circuit:

A. has no effect on the total circuit current
B. doubles the amount of total current
C. cuts the total current by one-half
D. thrice the amount of total current
E. None of the above

Answer: Option B

Explanation:

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14. 

How much current flows through a 0.02 micro F capacitor that is operating from a 12-V ac, 100-Hz source?

A. 0.151 mA
B. 157 raA
C. 0.995 mA
D. 2.02 A
E. None of the above

Answer: Option A

Explanation:

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15. 

An unloaded zener regulator has a source voltage of 20 V, a series resistance of 330 W, and a zener voltage of 12 V, What is the Zener current?

A. 28.4 mA
B. 24.2 mA
C. 34.4 mA
D. 68.4 mA
E. None of the above

Answer: Option B

Explanation:

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