E6 AMATEUR EXTRA Class --s 20-24 from groon exam with complete solutions.
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Course
E5 AMATEUR
Institution
E5 AMATEUR
5A1 What can cause the voltage across reactances in series to be larger than the voltage applied to them?
A.
Resonance
B.
Capacitance
C.
Conductance
D.
Resistance
A.
Resonance
A2 What is resonance in an LC or RLC Circuit?
A.
The highest frequency that will pass current
B.
T...
E6 AMATEUR EXTRA Class #'s 20-24 from
groon exam with complete solutions
A01 In what application is gallium arsenide used as a semiconductor material in
preference to germanium or silicon?
A.
In high-current rectifier circuits
B.
In high-power audio circuits
C.
In microwave circuits
D.
In very low frequency RF circuits - ANSWER-C.
In microwave circuits
A02 Which of the following semiconductor materials contains excess free electrons?
A.
N-type
B.
P-type
C.
Bipolar
D.
Insulated gate - ANSWER-A.
N-type
A03 Why does a PN-junction diode not conduct current when reverse biased?
A.
Only P-type semiconductor material can conduct current
B.
Only N-type semiconductor material can conduct current
C.
Holes in P-type material and electrons in the N-type material are separated by the
applied voltage, widening the depletion region
, D.
Excess holes in P-type material combine with the electrons in N-type material,
converting, the entire diode into an insulator - ANSWER-C.
Holes in P-type material and electrons in the N-type material are separated by the
applied voltage, widening the depletion region
A04 What is the name given to an impurity atom that adds holes to a semiconductor
crystal structure?
A.
Insulator impurity
B.
N-type impurity
C.
Acceptor impurity
D.
Donor impurity - ANSWER-C.
Acceptor impurity
A05 How does DC input impedance at the gate of a field-effect transistor compare with
the DC input impedance of a bipolar transistor?
A. They are both low impedance
B. An FET has lower input impedance
C. An FET has higher input impedance
D. They are both high impedance - ANSWER-C. An FET has higher input impedance
A06 What is the beta of a bipolar junction transistor?
A.
The frequency at which the current gain is reduced to 1
B.
The change in collector current with respect to base current
C.
The breakdown voltage of the base to collector junction
D.
The switching speed of the transistor - ANSWER-B.
The change in collector current with respect to base current
A07 Which of the following indicates that a silicon NPN junction transistor is biased on?
, A.
Base-to-emitter resistance of approximately 6 to 7 ohms
B.
Base-to-emitter resistance of approximately 0.6 to 0.7 ohms
C.
Base-to-emitter voltage of approximately 6 to 7 volts
D.
Base-to-emitter voltage of approximately 0.6 to 0.7 volts - ANSWER-D.
Base-to-emitter voltage of approximately 0.6 to 0.7 volts
A08 What term indicates the frequency at which the grounded-base current gain of a
transistor has decreased to 0.7 of the gain obtainable at 1 kHz?
A. Corner frequency
B. Alpha rejection frequency
C. Beta cutoff frequency
D. Alpha cutoff frequency - ANSWER-D.
Alpha cutoff frequency
A09 What is a depletion-mode FET?
A.
An FET that exhibits a current flow between source and drain when no gate voltage is
applied
B.
An FET that has no current flow between source and drain when no gate voltage is
applied
C.
Any FET without a channel
D.
Any FET for which holes are the majority carriers - ANSWER-A.
An FET that exhibits a current flow between source and drain when no gate voltage is
applied
A10 In Figure E6-2, what is the schematic symbol for an N-channel dual-gate
MOSFET?
A.
2
B.
4
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