NAVEDTRA 14179A, NEETS Mod. 7, Ch. 4

Question 1

Most power supplies are made up of the following four basic sections: transformer, rectifier, filter, and what else?

Answer 1

Regulator

Question 2

What steps up or steps down the input line voltage and isolates the power supply from the power line?

Answer 2

Transformer

Question 3

What converts the alternating current input signal to a pulsating direct current?

Answer 3

Rectifier

Question 4

What maintains the output of the power supply at a constant level in spite of large changes in load current or input line voltages?

Answer 4

Regulator

Question 5

What provides two equal voltages to the conventional full-wave rectifier?

Answer 5

Center-tapped transformer

Question 6

What is the conversion of an alternating current to a pulsating direct current?

Answer 6

Rectification

Question 7

What is current called that flows in pulses in the same direction?

Answer 7

Pulsating DC

Question 8

Which terms are AC voltages normally specified in?

Answer 8

RMS values

Question 9

Which type of device has two or more diodes arranged so that load current flows in the same direction during each half cycle of the ac supply?

Answer 9

Full-wave rectifier

Question 10

How many basic types of filter circuits are there?

Answer 10

Four

Question 11

What is defined as the time it takes a capacitor to charge to 63.2 percent of the applied voltage or to discharge to 36.8 percent of its total charge? 


Answer 11

One time constant

Question 12

What is the most basic type of power supply filter?

Answer 12

Capacitor filter

Question 13

Which type of filter is primarily used in power supplies where voltage regulation is important and where the output current is relatively high and subject to varying load conditions?

Answer 13

LC choke-input

Question 14

What percent of a half-wave rectifier is the ripple frequency of a full-wave rectifier?

Answer 14

200%

Question 15

Electrolytic capacitors are available in sizes up to how many microfarads or greater?

Answer 15

10,000

Question 16

What is one of the most commonly used filters primarily used in radio receivers, small audio amplifier power supplies, and in any type of power supply where the output current is low and the load current is relatively constant?

Answer 16

LC capacitor-input filter

Question 17

115 volts AC can vary from about 105 volts AC to how many volts AC?

Answer 17

125

Question 18

What gives an indication of how much the output voltage changes over a range of load resistance values?

Answer 18

Figure of merit

Question 19

Basic voltage regulators are classified as one of what two ways?

Answer 19

Series or Shunt

Question 20

Which type of diode blocks current until a specified voltage is applied?

Answer 20

Zener diode

Question 21

Which circuitry provides a constant current output?

Answer 21

Current regulator

Question 22

What are used primarily to develop high voltages where low current is required?

Answer 22

Voltage multipliers

Question 23

The DC output of the voltage multiplier ranges from 1000 to how many volts?

Answer 23

30,000

Question 24

In order for a silicon NPN transistor to conduct, the base must be between how many volts more positive than the emitter?

Answer 24

0.6 to 0.7 volts

Question 25

What are the two widely used checks in testing electronic equipment?

Answer 25

Signal tracing and Visual

Question 26

What is a short-circuit protection device that automatically limits the current to a safe value?

Answer 26

Current Limiter