ECT002
Priority Level: High (ECE & ECT)
- 1.What do the symbols on an electrical circuit schematic diagram represent?
- A.
Electrical components
- B.
Logic states
- C.
Digital codes
- D.
Traffic nodes
- 2.Which of the following is accurately represented in electrical circuit schematic diagrams?
- A.
Wire lengths
- B.
Physical appearance of components
- C.
The way components are interconnected
- D.
All of these choices are correct
- 3.Which of the following devices or circuits changes an alternating current into a varying direct current signal?
- A.
Transformer
- B.
Rectifier
- C.
Amplifier
- D.
Reflector
- 4.What best describes a relay?
- A.
A switch controlled by an electromagnet
- B.
A current controlled amplifier
- C.
An optical sensor
- D.
A pass transistor
- 5.Which of the following can be used to display signal strength on a numeric scale?
- A.
Potentiometer
- B.
Transistor
- C.
Meter
- D.
Relay
- 6.What component is commonly used to change 120V AC house current to a lower AC voltage for other uses?
- A.
Variable capacitor
- B.
Transformer
- C.
Transistor
- D.
Diode
- 7.Which of the following is commonly used as a visual indicator?
- A.
LED
- B.
FET
- C.
Zener diode
- D.
Bipolar transistor
- 8.Which of the following is used together with an inductor to make a tuned circuit?
- A.
Resistor
- B.
Zener diode
- C.
Potentiometer
- D.
Capacitor
- 9.What is the name of a device that combines several semiconductors and other components into one package?
- A.
Transducer
- B.
Multi-pole relay
- C.
Integrated circuit
- D.
Transformer
- 10.What is the purpose of a fuse in an electrical circuit?
- A.
To prevent power supply ripple from damaging a circuit
- B.
To interrupt power in case of overload
- C.
To limit current to prevent shocks
- D.
All of these choices are correct
- 11.Why is it unwise to install a 20-ampere fuse in the place of a 5-ampere fuse?
- A.
The larger fuse would be likely to blow because it is rated for higher current
- B.
The power supply ripple would greatly increase
- C.
Excessive current could cause a fire
- D.
All of these choices are correct
- 12.What is the function of a product detector?
- A.
Detect phase modulated signals
- B.
Demodulate FM signals
- C.
Detect CW and SSB signals
- D.
Combine speech and RF signals
- 13.What is the function of a mixer in a superheterodyne receiver?
- A.
To reject signals outside of the desired passband
- B.
To combine signals from several stations together
- C.
To shift the incoming signal to an intermediate frequency
- D.
To connect the receiver with an auxiliary device, such as a TNC
- 14.What device takes the output of a low-powered 28 MHz SSB exciter and produces a 222 MHz output signal?
- A.
High-pass filter
- B.
Low-pass filter
- C.
Transverter
- D.
Phase converter
- 15.Which of the following circuits combines a speech signal and an RF carrier?
- A.
Beat frequency oscillator
- B.
Discriminator
- C.
Modulator
- D.
Noise blanker
- 16.Which of the following circuits demodulates FM signals?
- A.
Limiter
- B.
Discriminator
- C.
Product detector
- D.
Phase inverter
- 17.Which term describes the ability of a receiver to discriminate between multiple signals?
- A.
Tuning rate
- B.
Sensitivity
- C.
Selectivity
- D.
Noise floor
- 18.Where is an RF preamplifier installed?
- A.
Between the antenna and receiver
- B.
At the output of the transmitter’s power amplifier
- C.
Between a transmitter and antenna tuner
- D.
At the receiver’s audio output
- 19.Why are UHF signals often more effective from inside buildings than VHF signals?
- A.
VHF signals lose power faster over distance
- B.
The shorter wavelength allows them to more easily penetrate the structure of buildings
- C.
This is incorrect; VHF works better than UHF inside buildings
- D.
UHF antennas are more efficient than VHF antennas
- 20.What should you do if another operator reports that your station’s 2 meter signals were strong just a moment ago, but now they are weak or distorted?
- A.
Change the batteries in your radio to a different type
- B.
Turn on the CTCSS tone
- C.
Ask the other operator to adjust his squelch control
- D.
Try moving a few feet, as random reflections may be causing multi-path distortion
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