1
AMS 116 Unit 4 Exam Study Guide | Comprehensive Review
with Practice Questions, Detailed Answers, Step-by-Step
Explanations & Rationales | Digital PDF Download
AMS 116 Unit 4 Exam Study Guide
Exam Coverage Summary
This examination covers semiconductor fundamentals including atomic structure, doping
processes, PN junction characteristics, diode operation and testing, rectifier circuits (half-
wave, full-wave, bridge), filtering techniques, Zener diodes, LED operation, transistor
construction and testing (NPN and PNP types), transistor biasing requirements, gain
calculations, transistorized lighting circuits, transformer theory (mutual induction, turns
ratios, step-up/step-down operation), battery fundamentals (lead-acid and NiCAD types),
specific gravity measurements, hydrometer usage, battery capacity calculations, charging
characteristics, safety procedures, and logic gate basics including AND gates and binary
representation.
1. What type of charge does a hole represent in a semiconductor crystal lattice structure?
A) Negative
B) Positive
C) Neutral
D) Alternating
Correct Answer: B) Positive
A hole is the absence of an electron in the crystal lattice, creating a missing negative charge that
behaves as a positive charge carrier moving through the material.
2. Through which manufacturing process is a pure semiconductor material converted into either
N-type or P-type material?
A) Diffusion
B) Doping
C) Deposition
D) Annealing
Correct Answer: B) Doping
Doping introduces specific impurity atoms into the semiconductor crystal to either add free
electrons (N-type) or create holes (P-type), fundamentally altering its electrical properties.
,2
3. Which two elemental materials are most commonly utilized in the production of
semiconductor devices?
A) Copper and Aluminum
B) Germanium and Silicon
C) Carbon and Silver
D) Gold and Platinum
Correct Answer: B) Germanium and Silicon
Germanium and silicon are the two primary semiconductor materials due to their four valence
electrons and suitable band gap energies for electronic device fabrication.
4. What specific circuit component is identified by the standard schematic symbol featuring a
triangle pointing toward a vertical line?
A) Resistor
B) Capacitor
C) Standard diode
D) Transistor
Correct Answer: C) Standard diode
The triangle with a vertical line at its point represents the standard PN junction diode, with the
triangle indicating the anode (P-type material) pointing toward the cathode (N-type material).
5. What type of semiconductor material forms the anode terminal of a standard PN junction
diode?
A) N-type
B) P-type
C) Intrinsic
D) Extrinsic
Correct Answer: B) P-type
The anode consists of P-type material which has an excess of holes, making it the positive
terminal when the diode is forward biased and allowing current flow in the forward direction.
6. When a reverse voltage reaches or exceeds a specific threshold value, which type of diode will
begin to conduct current in the reverse direction?
A) Standard diode
B) Light-emitting diode
C) Zener diode
D) Schottky diode
Correct Answer: C) Zener diode
Zener diodes are specially designed to operate in the reverse breakdown region at a precise
voltage, providing voltage regulation by conducting in reverse when the Zener voltage is
reached.
7. When a diode is forward biased, the negative battery terminal exerts what effect on the
electrons located in which semiconductor material?
A) Attracts / P-type
B) Repels / N-type
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C) Attracts / N-type
D) Repels / P-type
Correct Answer: B) Repels / N-type
The negative battery potential repels the free electrons in the N-type material, pushing them
toward the PN junction where they can cross and combine with holes in the P-type material.
8. What semiconductor material type composes the cathode terminal of a standard PN junction
diode?
A) P-type
B) N-type
C) Intrinsic
D) Extrinsic
Correct Answer: B) N-type
The cathode is constructed from N-type material which has an abundance of free electrons,
making it the negative terminal when the diode is forward biased and allowing electron flow into
the device.
9. To prevent current from flowing through a diode, what biasing condition must be applied
across the PN junction?
A) Forward bias
B) Reverse bias
C) Zero bias
D) Breakdown bias
Correct Answer: B) Reverse bias
Reverse biasing connects the positive battery terminal to the N-type material and negative to the
P-type, widening the depletion region and preventing majority carrier current flow through the
junction.
10. What happens to the depletion region width when a diode is placed under forward bias
conditions?
A) Widens
B) Narrows
C) Remains unchanged
D) Dissipates completely
Correct Answer: B) Narrows
Forward bias voltage reduces the depletion region width by attracting majority carriers toward
the junction, lowering the potential barrier and allowing current to flow through the diode.
11. A light-emitting diode will produce visible light output only when it is operated under which
biasing condition?
A) Reverse biased
B) Forward biased
C) Zero biased
D) Avalanche biased
Correct Answer: B) Forward biased
, 4
LEDs emit photons when forward biased as electrons recombine with holes in the junction
region, releasing energy in the form of visible or infrared light depending on the semiconductor
material used.
12. If a diode displays infinite resistance readings for both forward and reverse bias tests, what is
the most likely condition of this component?
A) Shorted
B) Open
C) Leaky
D) Normal
Correct Answer: B) Open
An open diode has an internal break in the semiconductor structure, preventing current flow in
either direction and resulting in infinite resistance measurements regardless of test lead polarity.
13. When using a digital volt-ohmmeter to test diodes, is it generally recommended to utilize the
resistance measurement function?
A) True
B) False
Correct Answer: B) False
The resistance function may not provide sufficient voltage to properly bias the diode junction,
and the diode test function is specifically designed to apply the correct forward bias voltage and
display the forward voltage drop.
14. What specific meter lead connection arrangement creates forward bias when testing a diode
with a digital volt-ohmmeter?
A) Red lead to anode, black lead to cathode
B) Red lead to cathode, black lead to anode
C) Red lead to anode, black lead to anode
D) Red lead to cathode, black lead to cathode
Correct Answer: A) Red lead to anode, black lead to cathode
Connecting the positive red lead to the P-type anode and the negative black lead to the N-type
cathode forward biases the diode, allowing current to flow through the junction and displaying
the forward voltage drop.
15. In a full-wave bridge rectifier circuit, what is the primary function regarding the AC input
waveform?
A) Rectifies only positive half cycles
B) Rectifies only negative half cycles
C) Rectifies the full AC sine wave
D) Amplifies the AC waveform
Correct Answer: C) Rectifies the full AC sine wave
The bridge rectifier configuration uses four diodes arranged in a bridge to convert both positive
and negative alternations of the AC input into unidirectional current flow through the load.
AMS 116 Unit 4 Exam Study Guide | Comprehensive Review
with Practice Questions, Detailed Answers, Step-by-Step
Explanations & Rationales | Digital PDF Download
AMS 116 Unit 4 Exam Study Guide
Exam Coverage Summary
This examination covers semiconductor fundamentals including atomic structure, doping
processes, PN junction characteristics, diode operation and testing, rectifier circuits (half-
wave, full-wave, bridge), filtering techniques, Zener diodes, LED operation, transistor
construction and testing (NPN and PNP types), transistor biasing requirements, gain
calculations, transistorized lighting circuits, transformer theory (mutual induction, turns
ratios, step-up/step-down operation), battery fundamentals (lead-acid and NiCAD types),
specific gravity measurements, hydrometer usage, battery capacity calculations, charging
characteristics, safety procedures, and logic gate basics including AND gates and binary
representation.
1. What type of charge does a hole represent in a semiconductor crystal lattice structure?
A) Negative
B) Positive
C) Neutral
D) Alternating
Correct Answer: B) Positive
A hole is the absence of an electron in the crystal lattice, creating a missing negative charge that
behaves as a positive charge carrier moving through the material.
2. Through which manufacturing process is a pure semiconductor material converted into either
N-type or P-type material?
A) Diffusion
B) Doping
C) Deposition
D) Annealing
Correct Answer: B) Doping
Doping introduces specific impurity atoms into the semiconductor crystal to either add free
electrons (N-type) or create holes (P-type), fundamentally altering its electrical properties.
,2
3. Which two elemental materials are most commonly utilized in the production of
semiconductor devices?
A) Copper and Aluminum
B) Germanium and Silicon
C) Carbon and Silver
D) Gold and Platinum
Correct Answer: B) Germanium and Silicon
Germanium and silicon are the two primary semiconductor materials due to their four valence
electrons and suitable band gap energies for electronic device fabrication.
4. What specific circuit component is identified by the standard schematic symbol featuring a
triangle pointing toward a vertical line?
A) Resistor
B) Capacitor
C) Standard diode
D) Transistor
Correct Answer: C) Standard diode
The triangle with a vertical line at its point represents the standard PN junction diode, with the
triangle indicating the anode (P-type material) pointing toward the cathode (N-type material).
5. What type of semiconductor material forms the anode terminal of a standard PN junction
diode?
A) N-type
B) P-type
C) Intrinsic
D) Extrinsic
Correct Answer: B) P-type
The anode consists of P-type material which has an excess of holes, making it the positive
terminal when the diode is forward biased and allowing current flow in the forward direction.
6. When a reverse voltage reaches or exceeds a specific threshold value, which type of diode will
begin to conduct current in the reverse direction?
A) Standard diode
B) Light-emitting diode
C) Zener diode
D) Schottky diode
Correct Answer: C) Zener diode
Zener diodes are specially designed to operate in the reverse breakdown region at a precise
voltage, providing voltage regulation by conducting in reverse when the Zener voltage is
reached.
7. When a diode is forward biased, the negative battery terminal exerts what effect on the
electrons located in which semiconductor material?
A) Attracts / P-type
B) Repels / N-type
,3
C) Attracts / N-type
D) Repels / P-type
Correct Answer: B) Repels / N-type
The negative battery potential repels the free electrons in the N-type material, pushing them
toward the PN junction where they can cross and combine with holes in the P-type material.
8. What semiconductor material type composes the cathode terminal of a standard PN junction
diode?
A) P-type
B) N-type
C) Intrinsic
D) Extrinsic
Correct Answer: B) N-type
The cathode is constructed from N-type material which has an abundance of free electrons,
making it the negative terminal when the diode is forward biased and allowing electron flow into
the device.
9. To prevent current from flowing through a diode, what biasing condition must be applied
across the PN junction?
A) Forward bias
B) Reverse bias
C) Zero bias
D) Breakdown bias
Correct Answer: B) Reverse bias
Reverse biasing connects the positive battery terminal to the N-type material and negative to the
P-type, widening the depletion region and preventing majority carrier current flow through the
junction.
10. What happens to the depletion region width when a diode is placed under forward bias
conditions?
A) Widens
B) Narrows
C) Remains unchanged
D) Dissipates completely
Correct Answer: B) Narrows
Forward bias voltage reduces the depletion region width by attracting majority carriers toward
the junction, lowering the potential barrier and allowing current to flow through the diode.
11. A light-emitting diode will produce visible light output only when it is operated under which
biasing condition?
A) Reverse biased
B) Forward biased
C) Zero biased
D) Avalanche biased
Correct Answer: B) Forward biased
, 4
LEDs emit photons when forward biased as electrons recombine with holes in the junction
region, releasing energy in the form of visible or infrared light depending on the semiconductor
material used.
12. If a diode displays infinite resistance readings for both forward and reverse bias tests, what is
the most likely condition of this component?
A) Shorted
B) Open
C) Leaky
D) Normal
Correct Answer: B) Open
An open diode has an internal break in the semiconductor structure, preventing current flow in
either direction and resulting in infinite resistance measurements regardless of test lead polarity.
13. When using a digital volt-ohmmeter to test diodes, is it generally recommended to utilize the
resistance measurement function?
A) True
B) False
Correct Answer: B) False
The resistance function may not provide sufficient voltage to properly bias the diode junction,
and the diode test function is specifically designed to apply the correct forward bias voltage and
display the forward voltage drop.
14. What specific meter lead connection arrangement creates forward bias when testing a diode
with a digital volt-ohmmeter?
A) Red lead to anode, black lead to cathode
B) Red lead to cathode, black lead to anode
C) Red lead to anode, black lead to anode
D) Red lead to cathode, black lead to cathode
Correct Answer: A) Red lead to anode, black lead to cathode
Connecting the positive red lead to the P-type anode and the negative black lead to the N-type
cathode forward biases the diode, allowing current to flow through the junction and displaying
the forward voltage drop.
15. In a full-wave bridge rectifier circuit, what is the primary function regarding the AC input
waveform?
A) Rectifies only positive half cycles
B) Rectifies only negative half cycles
C) Rectifies the full AC sine wave
D) Amplifies the AC waveform
Correct Answer: C) Rectifies the full AC sine wave
The bridge rectifier configuration uses four diodes arranged in a bridge to convert both positive
and negative alternations of the AC input into unidirectional current flow through the load.
