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 #342Radio Theory and Communication Principles

The tolerance bands:

  1. 10%, 5%, 1%
  2. 5%, 10%, 2%
  3. 5%, 10%, 1% ✓ Correct answer
  4. 10%, 5%, 2%

Open this question separately

Question #343Radio Theory and Communication Principles

A battery is a source of

  1. solar energy
  2. nuclear energy
  3. chemical energy ✓ Correct answer
  4. hydro energy

Open this question separately

Question #350Radio Theory and Communication Principles

In which device is a permanent magnet used?

  1. electric bell
  2. electromagnet
  3. plotting compass ✓ Correct answer
  4. relay e) transformer

Open this question separately

Question #351Radio Theory and Communication Principles

A coil of copper wire wrapped around a core could be used as an electromagnet. Which of the following combinations would produce the strongest electromagnet? Number of turns

  1. few
  2. few soft-iron steel
  3. many
  4. many e) many Copper soft-iron steel ✓ Correct answer

Open this question separately

Question #358Radio Theory and Communication Principles

Which of the following is a conductor

  1. Glass
  2. wood
  3. Tungsten ✓ Correct answer
  4. Plastic

Open this question separately

Question #359Radio Theory and Communication Principles

Which of the following is the best conductor for electricity?

  1. Distilled water
  2. Salt water ✓ Correct answer
  3. Tap water
  4. Rain water

Open this question separately

Question #360Radio Theory and Communication Principles

Filaments of electric bulbs are usually made of

  1. Nichrome
  2. Tungsten ✓ Correct answer
  3. Copper
  4. Carbon.

Open this question separately

Question #362Radio Theory and Communication Principles

In a receiver, which stage rectifies the IF signal?

  1. Mixer
  2. Frequency converter
  3. Detector ✓ Correct answer
  4. Loud speaker

Open this question separately

Question #364Radio Theory and Communication Principles

Which material opposes the movement of free electrons?

  1. Conductor
  2. Insulator ✓ Correct answer
  3. Semiconductor
  4. Element

Open this question separately

Question #368Radio Theory and Communication Principles

Components that connect in parallel form:

  1. branches ✓ Correct answer
  2. open circuits
  3. short circuits
  4. a voltage divider

Open this question separately

Question #379Radio Theory and Communication Principles

The unit for frequency is the

  1. hertz ✓ Correct answer
  2. ampere
  3. watt
  4. second

Open this question separately

Question #382Radio Theory and Communication Principles

What are the effects of moving a closed wire loop through a magnetic field?

  1. A voltage is induced in the wire.
  2. A current is induced in the wire.
  3. The polarity across the wire depends on the direction of motion.
  4. All the above ✓ Correct answer

Open this question separately

Question #383Radio Theory and Communication Principles

What do you call the characteristic of a magnetic material whereby a change in magnetization lags the application of a magnetizing force?

  1. Hysteresis ✓ Correct answer
  2. Induction
  3. Retentivity
  4. Reluctance

Open this question separately

Question #395Radio Theory and Communication Principles

The Law behind electromagnetism is

  1. Newton's law
  2. Faraday's law ✓ Correct answer
  3. Kirchhoff’s law
  4. Kepler's law

Open this question separately

Question #399Radio Theory and Communication Principles

The output signal of an CE amplifier will be

  1. 45 deg out of phase
  2. 90 deg out of phase
  3. 180 deg out of phase ✓ Correct answer
  4. None of the above

Open this question separately

Question #400Radio Theory and Communication Principles

"VOX" stands for:

  1. volume operated extension speaker
  2. voice operated transmit ✓ Correct answer
  3. variable oscillator transmitter
  4. voice operated expander

Open this question separately

Question #401Radio Theory and Communication Principles

The output signal of a detector in a communication receiver is in

  1. Audio Frequency range ✓ Correct answer
  2. Radio frequency range
  3. Intermediate Frequency range
  4. All the above

Open this question separately

Question #402Radio Theory and Communication Principles

In a Radio receiver, the sensitivity is governed by

  1. RF ✓ Correct answer
  2. Detector
  3. AF
  4. None of the above

Open this question separately

Question #403Radio Theory and Communication Principles

The noise in a Radio receiver can be expressed as

  1. S/N ratio ✓ Correct answer
  2. N/S ratio
  3. Level of reference signal
  4. None of above

Open this question separately

Question #407Radio Theory and Communication Principles

The layer that reflects higher frequencies in HF range during the day time is

  1. F1 layer
  2. F2 layer ✓ Correct answer
  3. E layer
  4. D layer

Open this question separately