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236 matching questions

Question #568Basic Electricity and Electronics

Which of the following circuits combines a speech signal and an RF carrier?

  1. Beat frequency Oscillator
  2. Discriminator
  3. Modulator ✓ Correct answer
  4. Noise blanker

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Question #570Basic Electricity and Electronics

A Diode can be used as

  1. Rectifier ✓ Correct answer
  2. Amplifier
  3. Oscillator
  4. All the above

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Question #575Basic Electricity and Electronics

In a p-type semiconductor, the current carriers are

  1. photons
  2. electrons
  3. positive ions
  4. holes ✓ Correct answer
Explanation: In a p-type semiconductor the majority carriers are holes.

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Question #576Basic Electricity and Electronics

A simple transmitter requires a 50 ohm dummy load. You can fabricate this from

  1. four 300 ohm resistors in parallel
  2. five 300 ohm resistors in parallel
  3. six 300 ohm resistors in parallel ✓ Correct answer
  4. seven 300 ohm resistors in parallel

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Question #577Basic Electricity and Electronics

A component is identified as a capacitor if its value is measured in

  1. Microvolts
  2. Milli henrys
  3. Megohms
  4. Micro farads ✓ Correct answer
Explanation: Capacitance is measured in farads (or microfarads). Millihenrys measure inductance.

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Question #582Basic Electricity and Electronics

One important application for diodes is recovering information from transmitted signals. This is referred to as

  1. biasing
  2. rejuvenation
  3. ionization
  4. demodulation ✓ Correct answer

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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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