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 #301Basic Electricity and Electronics

_______ is a measure of the amount of electrical energy transferred by an electric charge as it moves from one point to another in a circuit.

  1. Current ✓ Correct answer
  2. Charge
  3. Electric circuit
  4. Voltage

Open this question separately

Question #302Basic Electricity and Electronics

A(n) _______ is made of a current-carrying wire wrapped around an iron core.

  1. electric current
  2. insulator
  3. conductor
  4. electromagnet ✓ Correct answer

Open this question separately

Question #303Radio Theory and Communication Principles

What is the unit of charge?

  1. Coulomb ✓ Correct answer
  2. Newton.
  3. Watt
  4. Ohm

Open this question separately

Question #304Radio Theory and Communication Principles

Which of the following does not describe the magnetic force between two magnets?

  1. The like poles attract. ✓ Correct answer
  2. The like poles repel.
  3. It decreases as the magnets move apart.
  4. The unlike poles attract.

Open this question separately

Question #305Basic Electricity and Electronics

The maximum efficiency of a half-wave rectifier is

  1. 60%
  2. 66.7%
  3. 40.6% ✓ Correct answer
  4. 84.12%

Open this question separately

Question #306Radio Theory and Communication Principles

The barrier potential for Silicon

  1. 0.01V
  2. 0.1V
  3. 0.3V
  4. 0.7V ✓ Correct answer

Open this question separately

Question #307Radio Theory and Communication Principles

The barrier potential for germanium

  1. 0.01V
  2. 0.1V
  3. 0.3V ✓ Correct answer
  4. 0.7V

Open this question separately

Question #308Radio Theory and Communication Principles

The main cause why electrons can tunnel through a P-N junction, is due to

  1. their higher energy
  2. low impurity level
  3. thin layer depletion ✓ Correct answer
  4. low barrier potential

Open this question separately

Question #309Basic Electricity and Electronics

The ripple factor of a full wave rectifier without filter is

  1. 1.11
  2. 0.482 ✓ Correct answer
  3. 0.67
  4. 0.157

Open this question separately

Question #310Basic Electricity and Electronics

The unit of electrical resistance is the

  1. Joule.
  2. Ampere.
  3. Ohm. ✓ Correct answer
  4. Watt.

Open this question separately

Question #311Radio Theory and Communication Principles

In a flashlight two 1.5 volt batteries are connected in series. The result is

  1. An equivalent voltage of 1.5 volts, but more current will flow.
  2. An equivalent voltage of 3 volts. ✓ Correct answer
  3. That no current will flow.
  4. None of the above

Open this question separately

Question #312Radio Theory and Communication Principles

What is an electromagnet?

  1. A magnet that makes electricity.
  2. a magnet made of coiled wire that works when electricity runs through it . ✓ Correct answer
  3. a permanent magnet that is made using electricity
  4. None of the above
Explanation: An electromagnet is a magnet made of coiled wire that works when electric current flows through it; it is not a permanent magnet.

Open this question separately

Question #313Basic Electricity and Electronics

The type of current in a battery powered radio is..

  1. static current
  2. alternating current
  3. direct current ✓ Correct answer
  4. potential current

Open this question separately

Question #314Basic Electricity and Electronics

If you increase the voltage across a resistor, what happens to the current

  1. As the voltage increases, the current decreases.
  2. The current will not change if the resistor stays the same.
  3. As the voltage increases, the current increases. ✓ Correct answer
  4. None of the above
Explanation: By Ohm’s law (I = V/R), increasing the voltage across a fixed resistance increases the current.

Open this question separately

Question #315Basic Electricity and Electronics

The voltage drop across a series resistor is proportional to what other value?

  1. total resistance ✓ Correct answer
  2. its own resistance
  3. wattage rating
  4. the amount of time the circuit is on

Open this question separately

Question #316Basic Electricity and Electronics

One kilowatt hour of electrical energy is the same as

  1. 36 x 105.watts.
  2. 36 x 10s ergs
  3. 36 x 105 ✓ Correct answer
  4. 36 x 105 joules B.T.U.

Open this question separately

Question #317Basic Electricity and Electronics

An electric current of 5 A is same as

  1. 5 J / C
  2. 5 V / C
  3. 5 C / sec ✓ Correct answer
  4. 5 W/ sec.

Open this question separately

Question #318Basic Electricity and Electronics

Which of the following quantities can be measured in the unit of kilowatt • hour?

  1. Power
  2. Electrical energy ✓ Correct answer
  3. Fuse rating
  4. Power rating

Open this question separately

Question #319Basic Electricity and Electronics

Which of the following bulbs will have the least resistance ?

  1. 220 V, 60 W
  2. 220 V, 100 W
  3. 115 V, 60 W
  4. 115 V, 100 W. ✓ Correct answer

Open this question separately

Question #320Radio Theory and Communication Principles

When electromagnetic waves traveling in free space, which of the phenomenon is associated with it

  1. Diffraction
  2. Refraction
  3. Attenuation ✓ Correct answer
  4. Reflection

Open this question separately