DXRDXR ASOC EXAM PRACTICE PORTAL · VU3DXR.IN
OPEN LEARNING LIBRARY

ASOC Question Bank

Browse MCQs, correct answers and explanations free of charge. No registration is required.

700 matching questions

Question #161Basic Electricity and Electronics

What is the name of a current that reverses direction on a regular basis?

  1. An alternating current
  2. A direct current ✓ Correct answer
  3. A circular current
  4. A vertical current

Open this question separately

Question #162Basic Electricity and Electronics

What is the term used to describe opposition to current flow in ordinary conductors such as wires?

  1. Inductance
  2. Resistance ✓ Correct answer
  3. Counter EMF
  4. Magnetism

Open this question separately

Question #163Basic Electricity and Electronics

What instrument is used to measure the flow of current in an electrical circuit?

  1. Frequency meter
  2. SWR meter
  3. Ammeter ✓ Correct answer
  4. Voltmeter

Open this question separately

Question #164Radio Theory and Communication Principles

What instrument is used to measure Electromotive Force (EMF) between two points such as the poles of a battery?

  1. Magnetometer
  2. Voltmeter ✓ Correct answer
  3. Ammeter
  4. Ohmmeter

Open this question separately

Question #165Radio Theory and Communication Principles

What is the name for the distance a radio wave travels during one complete cycle?

  1. Wave speed
  2. Waveform
  3. Wavelength ✓ Correct answer
  4. Wave spread

Open this question separately

Question #166Basic Electricity and Electronics

What term describes the number of times that an alternating current flows back and forth per second?

  1. Pulse rate
  2. Speed
  3. Wavelength
  4. Frequency ✓ Correct answer

Open this question separately

Question #167Radio Theory and Communication Principles

What does 50 hertz (Hz) mean?

  1. 5000 cycles per second
  2. 50 cycles per second ✓ Correct answer
  3. 5000 meters per second
  4. 50 meters per second

Open this question separately

Question #168Radio Theory and Communication Principles

Electromagnetic waves that oscillate more than 20,000 times per second as they travel through space are generally referred to as what?

  1. Gravity waves
  2. Sound waves
  3. Radio waves ✓ Correct answer
  4. Gamma radiation

Open this question separately

Question #169Radio Theory and Communication Principles

How fast does a radio wave travel through space?

  1. At the speed of light ✓ Correct answer
  2. At the speed of sound
  3. Its speed is inversely proportional to its wavelength
  4. Its speed increases as the frequency increases

Open this question separately

Question #170Antennas and Radio Wave Propagation

How does the wavelength of a radio wave relate to its frequency?

  1. The wavelength gets longer as the frequency increases
  2. The wavelength gets shorter as the frequency increases ✓ Correct answer
  3. There is no relationship between wavelength and frequency
  4. The wavelength depends on the bandwidth of the signal

Open this question separately

Question #171Antennas and Radio Wave Propagation

What is the formula for converting frequency to wavelength in meters?

  1. Wavelength in meters equals frequency in Hertz multiplied by 300
  2. Wavelength in meters equals frequency in Hertz divided by 300
  3. Wavelength in meters equals frequency in megahertz divided by 300
  4. Wavelength in meters equals 300 divided by frequency in megahertz ✓ Correct answer

Open this question separately

Question #172Radio Theory and Communication Principles

What are sound waves in the range between 300 and 3000 Hertz called?

  1. Test signals
  2. Ultrasonic waves
  3. Voice frequencies ✓ Correct answer
  4. Radio frequencies

Open this question separately

Question #173Radio Theory and Communication Principles

What property of a radio wave is often used to identify the different bands amateur radio operators use?

  1. The physical length of the wave ✓ Correct answer
  2. The magnetic intensity of the wave
  3. The time it takes for the wave to travel one mile
  4. The voltage standing wave ratio of the wave

Open this question separately

Question #174Radio Theory and Communication Principles

What is the frequency range of the 2 meter band in the India?

  1. 144 to 146 MHz ✓ Correct answer
  2. 222 to 225 MHz
  3. 434 to 438 MHz
  4. 50 to 54 MHz

Open this question separately

Question #175Radio Theory and Communication Principles

What is used to convert radio signals into sounds we can hear?

  1. Transmitter
  2. Receiver ✓ Correct answer
  3. Microphone
  4. Antenna

Open this question separately

Question #176Radio Theory and Communication Principles

What is used to convert sounds from our voice into radio signals?

  1. Transmitter ✓ Correct answer
  2. Receiver
  3. Speaker
  4. Antenna

Open this question separately

Question #177Radio Theory and Communication Principles

What two devices are combined into one unit in a transceiver?

  1. Receiver, transmitter ✓ Correct answer
  2. Receiver, transformer
  3. Receiver, transistor
  4. Transmitter, deceiver

Open this question separately

Question #178Basic Electricity and Electronics

What device is used to convert the alternating current from a wall outlet into low-voltage direct current?

  1. Inverter
  2. Compressor
  3. Power Supply ✓ Correct answer
  4. Demodulator

Open this question separately

Question #179Basic Electricity and Electronics

What device is used to increase the output of a 10 watt radio to 100 watts?

  1. Amplifier ✓ Correct answer
  2. Power supply
  3. Antenna
  4. Attenuator

Open this question separately

Question #180Radio Theory and Communication Principles

Which of the battery types listed below offers the longest life when used with a hand-held radio, assuming each battery is the same physical size?

  1. Lead-acid
  2. Alkaline
  3. Nickel-cadmium
  4. Lithium-ion ✓ Correct answer

Open this question separately