Calculations

Question 1

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?

Answer 1

18 ohms

Question 2

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?

Answer 2

200 ohms

Question 3

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?

Answer 3

20%

Question 4

What turns ratio does a transformer need in order to match a source impedance of 500 ohms to a load of 10 ohms?

Answer 4

7.1 to 1

Question 5

Given a power supply with a full load voltage of 200 volts and a regulation of 25%, what is the no load voltage?

Answer 5

250 Volts

Question 6

What is the conductance (G) of a circuit if 6 amperes of current flows when 12 volts DC is applied?

Answer 6

0.50 Siemens (mhos)