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.

194 matching questions

Question #252Radio Theory and Communication Principles

Frequency is

  1. cycles per second ✓ Correct answer
  2. Kilo cycles per second
  3. Cycles per minute
  4. cycles per hour

Open this question separately

Question #258Radio Theory and Communication Principles

A superhetrodyne receiver is tuned to 555 KHz and its local oscillator at 1010 KHz . The image frequency will be

  1. 1565 KHz ✓ Correct answer
  2. 455 KHz
  3. 1465 KHz
  4. none of these

Open this question separately

Question #259Radio Theory and Communication Principles

3 to 30 MHz band is known as

  1. MF
  2. LF
  3. VHF
  4. HF ✓ Correct answer

Open this question separately

Question #263Radio Theory and Communication Principles

When frequency of a carrier is varied according to modulation the result is

  1. frequency modulation ✓ Correct answer
  2. amplitude modulation
  3. product detection
  4. none of these

Open this question separately

Question #265Radio Theory and Communication Principles

The quartz crystal oscillator is known for its

  1. linearity
  2. stability ✓ Correct answer
  3. high output
  4. flexibility

Open this question separately

Question #266Radio Theory and Communication Principles

The effect of inter electrode capacitance of a triode is more predominant at

  1. HF
  2. VHF
  3. LF
  4. none of these ✓ Correct answer

Open this question separately

Question #267Radio Theory and Communication Principles

Which of the following is a characteristic of a liquid crystal display?

  1. It requires ambient or back lighting
  2. It offers a wide dynamic range
  3. It has a wide viewing angle
  4. All of these choices are correct ✓ Correct answer

Open this question separately

Question #268Radio Theory and Communication Principles

What is meant by the term MMIC?

  1. Multi Megabyte Integrated Circuit
  2. Monolithic Microwave Integrated Circuit ✓ Correct answer
  3. Military-specification Manufactured Integrated Circuit
  4. Mode Modulated Integrated Circuit

Open this question separately

Question #269Radio Theory and Communication Principles

What is a microprocessor?

  1. A low powered analog signal processor used as a microwave detector
  2. A miniature computer on a single integrated circuit chip ✓ Correct answer
  3. A microwave detector, amplifier, and local oscillator on a chip
  4. A low voltage amplifier used in a microwave transmitter modulator stage

Open this question separately

Question #271Radio Theory and Communication Principles

What components are used in a power-supply filter network?

  1. Diodes
  2. Transformers and transistors
  3. Quartz crystals
  4. Capacitors and inductors ✓ Correct answer

Open this question separately

Question #274Radio Theory and Communication Principles

What should be the impedance of a low-pass filter as compared to the impedance of the transmission line into which it is inserted?

  1. Substantially higher
  2. About the same ✓ Correct answer
  3. Substantially lower
  4. Twice the transmission line impedance

Open this question separately

Question #275Radio Theory and Communication Principles

What is an advantage of a crystal controlled transmitter?

  1. Stable output frequency ✓ Correct answer
  2. Excellent modulation clarity
  3. Ease of switching between bands
  4. Ease of changing frequency

Open this question separately

Question #276Radio Theory and Communication Principles

What type of receiver is suitable for CW and SSB reception but does not require a mixer stage or an IF amplifier?

  1. A super-regenerative receiver
  2. A TRF receiver
  3. A super-heterodyne receiver
  4. A direct conversion receiver ✓ Correct answer

Open this question separately

Question #281Radio Theory and Communication Principles

Which of the following is a characteristic of a Class A amplifier?

  1. Low standby power
  2. High Efficiency
  3. No need for bias
  4. Low distortion ✓ Correct answer

Open this question separately

Question #282Radio Theory and Communication Principles

For which of the following modes is a Class C power stage appropriate for amplifying a modulated signal?

  1. SSB
  2. CW ✓ Correct answer
  3. AM
  4. All of these answers are correct

Open this question separately

Question #283Radio Theory and Communication Principles

Which of the following is an advantage of a Class C amplifier?

  1. High efficiency ✓ Correct answer
  2. Linear operation
  3. No need for tuned circuits
  4. All of these answers are correct

Open this question separately

Question #284Radio Theory and Communication Principles

How is the efficiency of an RF power amplifier determined?

  1. Divide the DC input power by the DC output power
  2. Divide the RF output power by the DC input power ✓ Correct answer
  3. Multiply the RF input power by the reciprocal of the RF output power
  4. Add the RF input power to the DC output power

Open this question separately

Question #285Radio Theory and Communication Principles

Which of the following describes a linear amplifier?

  1. Any RF power amplifier used in conjunction with an amateur transceiver
  2. An amplifier whose output preserves the input waveform ✓ Correct answer
  3. A Class C high efficiency amplifier
  4. An amplifier used as a frequency multiplier

Open this question separately

Question #287Radio Theory and Communication Principles

Which component stores energy in electric field.

  1. resistor
  2. capacitor ✓ Correct answer
  3. inductor
  4. transistor

Open this question separately

Question #288Radio Theory and Communication Principles

Which element stores energy in magnetic field.

  1. resistor
  2. capacitor
  3. inductor ✓ Correct answer
  4. transistor

Open this question separately