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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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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%

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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

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Question #344Basic Electricity and Electronics

Find the equivalent resistance of 2 No's 10K resistor in parallel

  1. 5k ✓ Correct answer
  2. 10K
  3. 15K
  4. 20K

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Question #345Basic Electricity and Electronics

Find the equivalent capacitance of 3 No's 10pf capacitor in parallel

  1. 10pf
  2. 20pf
  3. 30pf ✓ Correct answer
  4. 15pf

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Question #346Basic Electricity and Electronics

Which type resistor cannot be used in RF circuits

  1. Carbon film
  2. Metal film
  3. Wire wound ✓ Correct answer
  4. None of the above

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Question #347Basic Electricity and Electronics

The tendency of AC current flowing through a surface of a solid conductor

  1. Proximity effect
  2. skin effect ✓ Correct answer
  3. radiation effect
  4. None of the above

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Question #348Basic Electricity and Electronics

The resistance of a 100 W, 200 V lamp is

  1. 100 ohm
  2. 200 ohm
  3. 400 ohm ✓ Correct answer
  4. 1600 ohm.

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Question #349Basic Electricity and Electronics

The instrument used for measuring electric current is :

  1. ammeter ✓ Correct answer
  2. galvanometer
  3. voltmeter
  4. potentiometer

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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

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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

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Question #352Basic Electricity and Electronics

A transformer which is 80% efficient gives an output of 12V and 4A. What is the input power?

  1. 13W
  2. 38W ✓ Correct answer
  3. 60W
  4. 154W

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Question #353Basic Electricity and Electronics

Why is electrical energy usually transmitted at high voltage?

  1. the resistance of the transmission cables is as small as possible
  2. the transmission cables are safer to handle
  3. as little energy as possible is wasted in the transmission cables ✓ Correct answer
  4. the transmission system does not require transformers e) the current in the transmission cables is as large as possible

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Question #354Basic Electricity and Electronics

The potential difference required to pass a current 0.2 A in a wire of resistance 20W is ____.

  1. 100 V ✓ Correct answer
  2. 4 V
  3. .01 V
  4. 40 V

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Question #355Basic Electricity and Electronics

The work done in moving a unit positive charge across two points in an electric circuit is a measure of ___________.

  1. current
  2. potential difference ✓ Correct answer
  3. resistance
  4. power

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Question #356Basic Electricity and Electronics

When there is an electric current passing through a wire, the particles moving are __

  1. electrons ✓ Correct answer
  2. protons
  3. atoms
  4. ions

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Question #357Radio Equipment, Measurements and Safety

When a fuse is rated 8 A, it means _____________.

  1. it will not work if current is less than 8 A
  2. it has a resistance of 8 W
  3. it will work only if current is 8 A
  4. it will melt if current exceeds 8 A ✓ Correct answer

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Question #358Radio Theory and Communication Principles

Which of the following is a conductor

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

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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

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Question #360Radio Theory and Communication Principles

Filaments of electric bulbs are usually made of

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

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