Electronics

Question 1

Rectifier is sometime called a “_________”

Answer 1

converter

Question 2

DC from an AC rectifier is __________, but it _________.

Answer 2

unidirectional, pulsates

Question 3

The wave form from AC rectification can be either ________ or ________

Answer 3

full wave or half wave

Question 4

In half wave only one alternation is allowed through, the other alternation is
blocked by the diodes. True or False

Answer 4

True

Question 5

In half wave the ____________is the same as the AC input frequency.

Answer 5

ripple frequency

Question 6

the two types of Full wave rectification?

Answer 6

Biphase type
bridge type

Question 7

Half wave DC has the advantage over full wave DC in that
both alternations of the sine wave are used and so more
power can be dissipated. True or False

Answer 7

False. Full wave DC has the advantage over half wave DC in that
both alternations

Question 8

PIV rating of the diode must be at least the ________ of the AC input

Answer 8

Peak value

Question 9

DC meters read_______ values, while
AC meters read _______ values

Answer 9

Average, RMS

Question 10

For Full wave rectifier:
the output voltage will be a pulsating DC, with twice the ripple
frequency as the AC input. True or false

Answer 10

true

Question 11

What type of full wave rectification requires a center tapped (double coiled) transformer and two diodes.

Answer 11

Biphase type

Question 12

The _______________is made up of three layers of semiconductor material.

Answer 12

bipolar-junction transistor (abbreviated BJT)

Question 13

If two blocks of N-type semiconductor material are separated with a very thin
layer of P-type semiconductor material, then a ____________ is created

Answer 13

NPN transistor

Question 14

If two blocks of P-type semiconductor material are separated with a very thin
layer of N-type semiconductor material, then _________ a is created.

Answer 14

PNP transistor

Question 15

The emitter arrow always points from ___________material (just like a diode).

Answer 15

P-type to N-type

Question 16

An ohmmeter can be used to quickly test a diode for a _____, _______ and ______.

Answer 16

short, an open, and lead polarity.

Question 17

Beta defines the transistor’s _____________or ____________.

Answer 17

current gain, amplification factor

Question 18

When connecting ohmmeter to a diode that is forward-bias, the ohm meter should indicate a very ____________.

Answer 18

low resistance

Question 19

when connecting ohmmeter to a diode that is reverse bias, the ohm meter should indicate a very ____________.

Answer 19

high resistance

Question 20

If the ohmmeter indicates a low resistance in both directions of the diode, then the diode is ____________.

Answer 20

short-circuited

Question 21

If the ohmmeter shows a high resistance in both directions, then the diode is ____________

Answer 21

open-circuited

Question 22

The term transistor was derived from the words “_________’ and “__________”

Answer 22

transfer, resistor

Question 23

What equation is use to solve for “Beta”

Answer 23

Ic/Ib

Question 24

If the base current is reduced to a value close to zero (either by a very large value of R b , or by an open base circuit), then no collector current is allowed to flow. This is known as __________

Answer 24

Cut off

Question 25

When a transistor is saturated:

Answer 25

* The voltage across Rc is very nearly equal to the collector circuit voltage or supply voltage (V cc ). * The drop across the transistor (V ce ) is almost zero.

Question 26

When a transistor is cut off:

Answer 26

* The voltage across Rc is zero. * The drop across the transistor (V ce ) is equal to the collector circuit voltage or supply voltage (V cc )

Question 27

To remove ripple to an even higher degree, a __________ is used.

Answer 27

pi filter

Question 28

When using a capacitor filter the PIV of the diode has to be __________ value because the capacitor is acting as a source when the diode blocks

Answer 28

2 x the peak

Question 29

An inductor is connected in _______ with a rectified load.

Answer 29

series

Question 30

* Make a choke input filter by connecting an inductor in the input line to a capacitor filter.

Answer 30

* Make a choke input filter by connecting an inductor in the input line to a capacitor filter.

Question 31

when an LC filter is used at the output of a rectifier, the capacitor:

Answer 31

is in parallel with the load and inductor in series with the diode.

Question 32

when an inductor is added to a capacitor filter circuit, it:

Answer 32

improves voltages regulation under varying loads

Question 33

The amplification factor of a transistor is the ration of ............

Answer 33

IC and IB