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Question #621Amateur Radio Regulations and Licensing

When tuning up a transmitter, and in order to prevent jamming other users on the band, you must tune, initially

  1. On a harmonic outside the band.
  2. Directly into an antenna.
  3. Into a dummy load. ✓ Correct answer
  4. Directly into a dipole.

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Question #622Operating Procedures, Morse Code and Phonetics

QRT is defined as

  1. I am going to send now.
  2. I am going to stand-by.
  3. I intend to end this transmission. ✓ Correct answer
  4. Are you going to send now?

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Question #623Amateur Radio Regulations and Licensing

QRP means

  1. Close down.
  2. Address is.
  3. High Power.
  4. Low Power. ✓ Correct answer

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Question #624Amateur Radio Regulations and Licensing

The maximum DC input to the final stage of an amateur HF transmitter, when the operator is the holder of Restricted grade license is

  1. 25 watts
  2. 30 watts
  3. 50 watts ✓ Correct answer
  4. 500 watts

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Question #625Amateur Radio Regulations and Licensing

What is maximum DC input to the final stage of an amateur transmitter on 145.500MHz, if the operator has General grade license is:

  1. 25 watts ✓ Correct answer
  2. 40 watts
  3. 50 watts
  4. 100 watts

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Question #626Amateur Radio Regulations and Licensing

What is maximum DC input to the final stage of an amateur transmitter on 145.500MHz, if the operator has Restricted grade license is

  1. 5 watts
  2. 10 watts ✓ Correct answer
  3. 25 watts
  4. 100 watts

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Question #627Basic Electricity and Electronics

The SI unit of electric charge is

  1. Coulomb ✓ Correct answer
  2. Ohm
  3. Watt
  4. Volt
Explanation: The coulomb is the SI unit of electric charge.

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Question #628Basic Electricity and Electronics

Power (in watts) in a DC circuit is equal to

  1. V × I ✓ Correct answer
  2. V / I
  3. I / R
  4. V × R
Explanation: Electrical power P = V × I.

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Question #629Basic Electricity and Electronics

A short circuit has

  1. Very low resistance ✓ Correct answer
  2. Very high resistance
  3. Infinite resistance
  4. Zero current always
Explanation: A short circuit presents a path of very low resistance.

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Question #630Basic Electricity and Electronics

An open circuit has

  1. Infinite resistance ✓ Correct answer
  2. Zero resistance
  3. High current
  4. Zero voltage
Explanation: An open circuit has effectively infinite resistance and no current flow.

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Question #631Basic Electricity and Electronics

The unit of frequency is

  1. Hertz ✓ Correct answer
  2. Henry
  3. Farad
  4. Tesla
Explanation: Frequency is measured in hertz (Hz).

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Question #632Basic Electricity and Electronics

1 kHz is equal to

  1. 1000 Hz ✓ Correct answer
  2. 100 Hz
  3. 10 Hz
  4. 1,000,000 Hz
Explanation: 1 kilohertz = 1000 hertz.

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Question #633Basic Electricity and Electronics

1 MHz is equal to

  1. 1,000,000 Hz ✓ Correct answer
  2. 1000 Hz
  3. 100 Hz
  4. 10 Hz
Explanation: 1 megahertz = 1,000,000 hertz.

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Question #634Basic Electricity and Electronics

The opposition to AC offered by a capacitor is called

  1. Capacitive reactance ✓ Correct answer
  2. Resistance
  3. Inductance
  4. Conductance
Explanation: Capacitive reactance (Xc) is the opposition a capacitor offers to AC.

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Question #635Basic Electricity and Electronics

The opposition to AC offered by an inductor is called

  1. Inductive reactance ✓ Correct answer
  2. Capacitance
  3. Resistance
  4. Admittance
Explanation: Inductive reactance (Xl) is the opposition an inductor offers to AC.

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Question #636Basic Electricity and Electronics

In a series circuit the current is

  1. The same through all components ✓ Correct answer
  2. Different in each component
  3. Zero
  4. Infinite
Explanation: Current is the same at all points in a series circuit.

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Question #637Basic Electricity and Electronics

In a parallel circuit the voltage is

  1. The same across all branches ✓ Correct answer
  2. Different across each branch
  3. Zero
  4. Always increasing
Explanation: Voltage is the same across parallel branches.

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Question #638Basic Electricity and Electronics

A fuse is used to

  1. Protect a circuit from excessive current ✓ Correct answer
  2. Increase voltage
  3. Store charge
  4. Amplify signals
Explanation: A fuse protects by opening when current is too high.

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Question #639Basic Electricity and Electronics

The colour code band for tolerance of ±5% is

  1. Gold ✓ Correct answer
  2. Silver
  3. Brown
  4. Red
Explanation: A gold tolerance band indicates ±5%.

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Question #640Basic Electricity and Electronics

Which instrument measures current?

  1. Ammeter ✓ Correct answer
  2. Voltmeter
  3. Ohmmeter
  4. Wattmeter
Explanation: An ammeter measures electric current.

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