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194 matching questions

Question #289Radio Theory and Communication Principles

Which battery is non chargeable.

  1. Lead acid
  2. nickel cadmium
  3. lithium ion
  4. zinc carbon ✓ Correct answer

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Question #293Radio Theory and Communication Principles

One coulomb passing a point in one second is one:

  1. ampere ✓ Correct answer
  2. volt
  3. ohm
  4. charge

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Question #294Radio Theory and Communication Principles

A switch is a device that:

  1. short circuits complex circuits
  2. holds a fuse
  3. has double poles
  4. opens or completes a current path ✓ Correct answer

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Question #295Radio Theory and Communication Principles

The term used to designate electrical pressure is:

  1. voltage ✓ Correct answer
  2. current
  3. resistance
  4. conductance

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Question #296Radio Theory and Communication Principles

_______ are materials in which electric charges do not move easily.

  1. Insulators ✓ Correct answer
  2. Conductors
  3. Circuits
  4. Metals

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Question #298Radio Theory and Communication Principles

____can prevent damage caused to buildings by lightning strikes.

  1. Insulating
  2. Conducting
  3. Grounding ✓ Correct answer
  4. Charging

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Question #299Radio Theory and Communication Principles

The measure of how difficult it is for electrons to flow in an object is called the _______.

  1. electric circuit
  2. electric resistance ✓ Correct answer
  3. magnetic domain
  4. electric field

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Question #303Radio Theory and Communication Principles

What is the unit of charge?

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

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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.

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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

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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

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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

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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

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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.

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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

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Question #323Radio Theory and Communication Principles

The range of audible frequency for humans is

  1. 20Hz to 20KHz ✓ Correct answer
  2. 20Hz to 15MHz
  3. 20KHz to 15MHz
  4. 2MHz to 20MHz

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Question #326Radio Theory and Communication Principles

Connecting a lead from the negative to the positive of a battery will produce:

  1. A high resistance circuit
  2. A short circuit ✓ Correct answer
  3. A low current path
  4. An open circuit

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Question #328Radio Theory and Communication Principles

If a small value of capacitance is connected in parallel with a large value, the combined capacitance will be:

  1. The same
  2. Higher ✓ Correct answer
  3. Lower
  4. None of the above

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Question #338Radio Theory and Communication Principles

1mA is equal to:

  1. 0.001A ✓ Correct answer
  2. 0.00001A
  3. 0.01A
  4. 0.1A

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Question #341Radio Theory and Communication Principles

A CRO is a

  1. Cathode Ray Oscillator
  2. Cathode Ray Oscilloscope ✓ Correct answer
  3. Capacitor-Resistor Oscillator
  4. Capacitor-Resistor Output

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