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Question #541Basic Electricity and Electronics

What are the names of the two electrodes of a diode?

  1. Plus and minus
  2. Source and drain
  3. anode and cathode ✓ Correct answer
  4. Base and emitter

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Question #542Basic Electricity and Electronics

How much power is being applied in a circuit when the applied voltage is 13.8 volts DC and current is 10A

  1. 138 Watts ✓ Correct answer
  2. 0.7 Watts
  3. 23.8 Watts
  4. 3.8 Watts

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Question #543Basic Electricity and Electronics

What is the resistance of a circuit that draws 4A from a 12-volt source?

  1. 3ohms ✓ Correct answer
  2. 16 ohms
  3. 43 ohms
  4. 8 ohms

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Question #544Radio Theory and Communication Principles

Which instrument would you use to measure electric potential or electromotive force?

  1. An ammeter
  2. A voltmeter ✓ Correct answer
  3. A wave meter
  4. An ohmmeter

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Question #545Basic Electricity and Electronics

How is an ammeter usually connected to a circuit?

  1. In series with the circuit ✓ Correct answer
  2. In parallel with the circuit
  3. In quadrature with the circuit
  4. In phase with the circuit

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Question #546Basic Electricity and Electronics

What electrical component is used to oppose the flow of current in a DC circuit?

  1. Inductor
  2. Resistor ✓ Correct answer
  3. Voltmeter
  4. Transformer

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Question #547Basic Electricity and Electronics

Which of the following does not change in a transformer ?

  1. Current
  2. Voltage
  3. Frequency ✓ Correct answer
  4. All the above

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Question #548Basic Electricity and Electronics

A transformer core is laminated to

  1. reduce hysteresis loss
  2. reduce eddy current losses ✓ Correct answer
  3. reduce copper losses
  4. reduce all above losses

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Question #549Basic Electricity and Electronics

A transformer cannot raise or lower the voltage of a D.C. supply because

  1. there is no need to change the D.C. voltage
  2. a D.C. circuit has more losses
  3. Faraday's laws of electromagnetic induction are not valid since the rate of change of flux is zero ✓ Correct answer
  4. none of the above

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Question #550Basic Electricity and Electronics

An ideal transformer is one which has

  1. no losses and magnetic leakage ✓ Correct answer
  2. interleaved primary and secondary windings
  3. a common core for its primary and secondary windings
  4. core of stainless steel and winding of pure copper metal e) none of the above

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Question #551Basic Electricity and Electronics

When the turns ratio of a transformer is 20 and the primary ac voltage is 12 V, the secondary voltage is

  1. 120v
  2. 12v
  3. 240v ✓ Correct answer
  4. 440v

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Question #552Radio Theory and Communication Principles

What type of component is often used as an adjustable volume control?

  1. Fixed resistor
  2. Power resistor
  3. Potentiometer ✓ Correct answer
  4. Transformer

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Question #553Radio Theory and Communication Principles

What electrical parameter is controlled by a potentiometer?

  1. Inductance
  2. Resistance ✓ Correct answer
  3. Capacitance
  4. Field strength

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Question #554Basic Electricity and Electronics

What is the term that describes a transistor’s ability to amplify a signal?

  1. Gain ✓ Correct answer
  2. Forward resistance
  3. resistance
  4. impedance

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Question #555Basic Electricity and Electronics

What component is commonly used to change 230V AC house voltage to a lower AC voltage for other uses?

  1. Variable capacitor
  2. transformer ✓ Correct answer
  3. Transistor
  4. Diode

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Question #556Radio Theory and Communication Principles

Which of the following is commonly used as a visual indicator?

  1. LED ✓ Correct answer
  2. FET
  3. Zener diode
  4. Bipolar transistor

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Question #557Basic Electricity and Electronics

Which of the following is used together with an inductor to make a tuned circuit?

  1. Resistor
  2. Zener diode
  3. Potentiometer
  4. Capacitor ✓ Correct answer

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Question #558Basic Electricity and Electronics

A semiconductor is said to be doped when small quantities of the following are added

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

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Question #559Radio Theory and Communication Principles

What is the function of a product detector?

  1. Detect phase modulated signals
  2. Demodulate FM signals
  3. Detect CW and SSB signals ✓ Correct answer
  4. Modulate speech with RF

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Question #560Basic Electricity and Electronics

Which of the following circuits demodulates FM signals?

  1. Limiter
  2. Discriminator ✓ Correct answer
  3. Product detector
  4. Phase inverter

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