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Question #321Antennas and Radio Wave Propagation

Which is used as a multi-band HF receiving antenna

  1. Conical horn
  2. Long-periodic ✓ Correct answer
  3. Square—loop
  4. Folded-dipole

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Question #322Antennas and Radio Wave Propagation

The designed output impedance of the antenna socket of most modern transmitters is nominally:

  1. 25 ohm
  2. 50 ohm ✓ Correct answer
  3. 75 ohm
  4. 100 ohm

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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 #324Antennas and Radio Wave Propagation

If the antenna is vertical with respect to earth, then waves are

  1. Constant
  2. Polarized vertical ✓ Correct answer
  3. Polarized horizontal
  4. None of these

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Question #325Basic Electricity and Electronics

In a capacitor, the electric charge is stored in _

  1. Metal plates ✓ Correct answer
  2. Dielectric
  3. Terminals
  4. both a &c

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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 #327Basic Electricity and Electronics

If two resistors are placed in series, is the final resistance:

  1. Higher ✓ Correct answer
  2. Lower
  3. The same
  4. Cannot be determined

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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 #329Basic Electricity and Electronics

If the voltage on the base of a transistor increases, does it:

  1. Turn on
  2. Turn off
  3. Not enough information ✓ Correct answer
  4. Remain the same

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Question #330Basic Electricity and Electronics

A 100n capacitor in parallel with 10n produces:

  1. 90n
  2. 100n
  3. 110n ✓ Correct answer
  4. Cannot be determined

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Question #331Basic Electricity and Electronics

A resistor with colour bands: red-red-red-gold, has the value:

  1. 22k 5%
  2. 2k2 5% ✓ Correct answer
  3. 220R 5%
  4. 22R 5%

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Question #332Basic Electricity and Electronics

A resistor and capacitor in series is called a:

  1. Pulse Circuit
  2. Timing Circuit/Delay Circuit ✓ Correct answer
  3. Oscillator Circuit/Frequency Circuit
  4. Schmitt Circuit

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Question #333Basic Electricity and Electronics

A red-red-red-gold resistor in series with an orange-orange-orange-gold resistor produces:

  1. 5k5
  2. 35,200 ohms ✓ Correct answer
  3. 55k
  4. None of the above

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Question #334Basic Electricity and Electronics

To obtain a higher value of resistance, resistors are connected in:

  1. Reverse
  2. Forward
  3. Parallel
  4. Series ✓ Correct answer

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Question #335Basic Electricity and Electronics

A capacitor and coil in parallel is called:

  1. A Tuned Circuit ✓ Correct answer
  2. A Timing Circuit
  3. A Delay Circuit
  4. A Schmitt Circuit

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Question #336Basic Electricity and Electronics

The current in a circuit is 45mA. This is:

  1. 0.045A ✓ Correct answer
  2. 0.00045A
  3. 0.0045A
  4. 0.45A

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Question #337Basic Electricity and Electronics

A 100n capacitor can be expressed as:

  1. 0.1μ ✓ Correct answer
  2. 0.01μ
  3. 0.001μ
  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 #339Basic Electricity and Electronics

If a 10k resistor is placed across a 10v supply, the current will be:

  1. 10mA
  2. 1mA ✓ Correct answer
  3. 0.01mA
  4. 0.1mA

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Question #340Basic Electricity and Electronics

DC voltage ____

  1. rises and falls
  2. is a sine wave
  3. remains constant ✓ Correct answer
  4. is an audio waveform

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