E7D01

What is one characteristic of a linear electronic voltage regulator?

1. The conduction of a control element is varied to maintain a constant output voltage

E7D02

What is one characteristic of a switching electronic voltage regulator?

1. The control device’s duty cycle is controlled to produce a constant average output voltage

E7D03

What device is typically used as a stable reference voltage in a linear voltage regulator?

1. A Zener diode

E7D04

Which of the following types of linear regulator makes the most efficient use of the primary power source?

1. A series regulator

E7D05

Which of the following types of linear voltage regulator places a constant load on the unregulated voltage source?

1. A shunt regulator

E7D06

What is the purpose of Q1 in the circuit shown in Figure E7-3?

1. It increases the current-handling capability of the regulator

E7D07

What is the purpose of C2 in the circuit shown in Figure E7-3?

1. It bypasses hum around D1

E7D08

What type of circuit is shown in Figure E7-3?

1. Linear voltage regulator

E7D09

What is the purpose of C1 in the circuit shown in Figure E7-3?

1. It filters the supply voltage

E7D10

What is the purpose of C3 in the circuit shown in Figure E7-3?

1. It prevents self-oscillation

E7D11

What is the purpose of R1 in the circuit shown in Figure E7-3?

1. It supplies current to D1

E7D12

What is the purpose of R2 in the circuit shown in Figure E7-3?

1. It provides a constant minimum load for Q1

E7D13

What is the purpose of D1 in the circuit shown in Figure E7-3?

1. To provide a voltage reference

E7D14

What is one purpose of a "bleeder" resistor in a conventional (unregulated) power supply?

1. To improve output voltage regulation

E7D15

What is the purpose of a "step-start" circuit in a high-voltage power supply?

1. To allow the filter capacitors to charge gradually

E7D16

When several electrolytic filter capacitors are connected in series to increase the operating voltage of a power supply filter circuit, why should resistors be connected across each capacitor?

1. A. To equalize, as much as possible, the voltage drop across each capacitor
2. B. To provide a safety bleeder to discharge the capacitors when the supply is off
3. C. To provide a minimum load current to reduce voltage excursions at light loads
4. D. All of these answers are correct

E7D17

What is the primary reason that a high-frequency inverter type high-voltage power supply can be both less expensive and lighter in weight than a conventional power supply?

1. The high frequency inverter design uses much smaller transformers and filter components for an equivalent power output

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