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WorksheetsCh. 28, 29, 30 Review
Total questions: 40
Worksheet time: 24mins
Component that Convert AC to DC and allow current to flow in one Direction
Capacitor
Diode
Inverter
Resistor
Anode is _________ Polarity in diodes
Negative
Positive
Ground
Hot Side
Types of diodes used in lighting system and display
LED
zener diodes
rectifier diodes
schottky
What type of diode is in the picture?
rectifier
silicon
zener
tunnel
What is the name of this Diode?
PN junction
LED
silicon
PNP
Diodes is Categorize as ?
linear components
non-linear components
conductor
insulator
The region on either side of the junction which becomes free from the mobile charge carriers is called
Energy gap region
Charge free region
Diffusion region
Depletion region
Device used for filter circuit is
Diode
Capacitor
Transistor
Amplifier
The output wave form of a full wave rectifier is
an AC voltage
an DC voltage
Zero
a pulsating unidirectional voltage
Zener diodes are mostly used for
rectifier circuits
Filter Circuits
solar cells
Voltage regulator circuits
In the forward bias arrangement of a p-n junction diode,
the n-end is connected to the positive terminal of the battery
the p-end is connected to the positive terminal of the battery
the direction of current is from n-end to p-end in the diode
the p-end is connected to the negative terminal of the battery
The average value of a half-wave rectified voltage with a peak value of 200 V is
127.3 V
141 V
0 V
63.7 V
When a 60 Hz sinusoidal voltage is applied to the input of a half-wave rectifier, the output frequency is
60 Hz
120 Hz
0 Hz
30 Hz
The average value of a full-wave rectified voltage with a peak value of 75 V is
37.5 V
23.9 V
53 V
47.8 V
When a 60 Hz sinusoidal voltage is applied to the input of a full-wave rectifier, the output frequency is
60 Hz
120 Hz
240 Hz
0 Hz
When the peak output voltage is 100 V, the PIV for each diode in a center-tapped full-wave rectifier is:
100 V
141 V
200 V
50 V
When the rms output voltage of a bridge full wave rectifier is 20 V, the peak inverse voltage across the diodes is (neglecting the diode drop)
28.3 V
20 V
40 V
56.6 V
How many diodes does a bridge circuit require?
2
3
4
5
What is the process by which AC is converted to pulsating DC?
Charging
Rectification
Filtering
Clipping
How many diodes will you use to have a basic half – wave rectifier?
1
2
3
4
The four basic circuit blocks that make up a power supply respectively are:
transformer, clipper, filter, regulator
rectifier, clamper, filter, regulator
transformer, rectifier, inverter, regulator
transformer, rectifier, filter, regulator
The main job of a voltage regulator is to provide a nearly _________ output voltage
sinusoidal
constant
smooth
fluctuating
Materials which can conduct electricity better than insulator,but not as well as conductors. This is the definition of
diode
semiconductor
conductor
insulator
superconductor
Doping of Semiconductors
materials which can conduct electricity better than insulator, but not as well as conductors.
The process of adding of a certain amount of specific impurities atoms in the pure semiconductor.
when 4 electrons in outermost orbit.
These are the characteristics of pentavalent impurities except
•5 valence electron.
•contributing extra free electrons.
•produce n-type semiconductors.
•produce p-type semiconductors.
The diagram is a process
of doping
of adding impurities
of half-wave rectification
of full-wave rectification
This is a graph that is seen on CRO. How is it change after full wave rectification process?
Choose the diagrams that show smoothing process has occured
The process of adding an impurity to an intrinsic semiconductor is called
Doping
Ionization
Recombination
Atomic modification
What is the most common semiconductor material used for producing integrated circuits
Quartz
Silicon
Diamond
Tantalum
The function of a transformer is to ...
raise and lower the apparent power levels
transfer DC voltage from the primary winding to the secondary winding
increase or decrease A.C voltage or A.C current levels
transform mechanical energy into electrical energy
A step up transformer has its primary winding to secondary winding ratio
Greater than 1
Equal to 1
Less than 1
Unknown
Primary winding of a transformer is determined by ...
which winding is nearer to the load
which winding is connected to the source
which winding has more turns
which side has the highest voltage
The electrical energy is transferred through the ... in a transformer.
electric field
rotor
air space
magnetic field
Choose the correct statement:
The ratio of the secondary voltage to the primary voltage is equal to the ratio of the primary turn to the secondary turn
The ratio of the primary current to the secondary current is equal to the ratio of the primary voltage to the secondary voltage
The ratio of the primary apparent power to the secondary apparent power is equal to the ration of the primary voltage to the secondary voltage
The ratio of the secondary current to the primary current is equal to the ratio of the primary turn to the secondary turn
Choose the correct statement:
The efficiency of a transformer is the percentage of the ratio of its input power to the output power
The ratio of the input apparent power to the output apparent power is less than 1 for a practical transformer
The ratio of the number of turns in the secondary winding to the number of turn in the primary winding determine the type of the transformer
Copper loss is due to eddy current in the core
Knee voltage of a silicon rectifier diode is:
7 V
.7 V
1.5V to 2.5V
2V
The knee voltage for a typical light emitting diode is:
7V
.7V
1.5V to 2.5V
5V
If an input voltage to a regulator circuit is 15V and the zener diode is rated for 5V, what is the voltage drop on the series resistor?
15V
10V
5V
.7V
What is the current through zener diode with an input voltage of 10V and a zener voltage of 5V in series with a 1K ohm resistor?
5mA
50mA
5A
1A
