3-B-018: Calculations
3-18B1:
What is the magnitude of the impedance of a series AC circuit having a resistance of 6 ohms, an inductive reactance of 17 ohms, and zero capacitive reactance?
18 ohms.
6.6 ohms.
11 ohms.
23 ohms.
3-18B2:
A 1-watt, 10-volt Zener diode with the following characteristics: Imin. = 5 mA; Imax. = 95 mA; and Z = 8 ohms, is to be used as part of a voltage regulator in a 20-V power supply. Approximately what size current-limiting resistor would be used to set its bias to the midpoint of its operating range?
200 ohms.
100 ohms.
1 kilohms.
2 kilohms.
3-18B3:
Given a power supply with a no load voltage of 12 volts and a full load voltage of 10 volts, what is the percentage of voltage regulation?
20 %
17 %
80 %
83 %
3-18B4:
What turns ratio does a transformer need in order to match a source impedance of 500 ohms to a load of 10 ohms?
7.1 to 1.
14.2 to 1.
50 to 1.
None of these.
3-18B5:
Given a power supply with a full load voltage of 200 volts and a regulation of 25%, what is the no load voltage?
250 volts.
150 volts.
160 volts.
240 volts.
3-18B6:
What is the conductance (G) of a circuit if 6 amperes of current flows when 12 volts DC is applied?
0.50 Siemens (mhos).
0.25 Siemens (mhos).
1.00 Siemens (mhos).
1.25 Siemens (mhos).
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