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236 matching questions

Question #373Basic Electricity and Electronics

The material used between the plates of a capacitor is called its:

  1. insulation material
  2. dielectric material ✓ Correct answer
  3. separation material
  4. plate-divider material

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Question #374Basic Electricity and Electronics

In a power supply diagram, which block indicates a smooth dc output?

  1. transformer
  2. filter ✓ Correct answer
  3. rectifier
  4. regulator

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Question #375Basic Electricity and Electronics

A filtered full-wave rectifier voltage has a smaller ripple than does a half-wave rectifier voltage for the same load resistance and capacitor values because:

  1. there is a shorter time between peaks ✓ Correct answer
  2. there is a longer time between peaks
  3. the larger the ripple, the better the filtering action
  4. none of the above

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Question #376Basic Electricity and Electronics

The voltage where current may start to flow in a reverse-biased pn junction is called the….

  1. breakdown voltage ✓ Correct answer
  2. barrier potential
  3. forward voltage
  4. biasing voltage

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Question #377Basic Electricity and Electronics

In a power supply diagram, which block indicates a pulsating dc output?

  1. transformer
  2. filter
  3. rectifier ✓ Correct answer
  4. regulator

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Question #378Basic Electricity and Electronics

Which of the following circuits would require the least amount of filtering?

  1. A half-wave rectifier
  2. A full-wave rectifier
  3. A bridge rectifier
  4. A full-wave rectifier and a bridge rectifier. ✓ Correct answer

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Question #380Basic Electricity and Electronics

What is the kilowatt-hour consumption of a 40 W lamp if it remains on for 1750 h?

  1. 43.75
  2. 70 ✓ Correct answer
  3. 43,750
  4. 70,000

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Question #381Basic Electricity and Electronics

Ohm's law describes the mathematical relationship between

  1. ohms, kilohm's, and megohms
  2. resistor size and resistor value
  3. resistance, voltage, and current ✓ Correct answer
  4. none of the above

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Question #384Basic Electricity and Electronics

Increasing the number of turns of wire on the secondary of a transformer will

  1. increase the secondary current
  2. decrease the secondary current ✓ Correct answer
  3. have no effect on the secondary current
  4. increase the primary current 103.Mutual induction is dependent on

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Question #385Basic Electricity and Electronics

Which of these components is made of three layers of semiconductor material?

  1. Alternator
  2. Bipolar junction transistor ✓ Correct answer
  3. Triode
  4. Pentagrid converter 108.What electrical component is usually composed of a coil of wire?

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Question #387Basic Electricity and Electronics

The reactance of an inductor increases as the:

  1. frequency increase ✓ Correct answer
  2. frequency decreases
  3. applied voltage increases
  4. applied voltage decreases 160.How is an ammeter usually connected to a circuit?

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Question #388Basic Electricity and Electronics

In a transformer the energy is conveyed from primary to secondary

  1. through cooling coil
  2. through air
  3. by the flux ✓ Correct answer
  4. none of the above 164.A transformer core is laminated to

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Question #389Basic Electricity and Electronics

The degree of mechanical vibrations produced by the laminations of a transformer depends on

  1. tightness of clamping
  2. gauge of laminations
  3. size of laminations
  4. all the above ✓ Correct answer

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Question #390Basic Electricity and Electronics

The purpose of providing an iron core in a transformer is to

  1. provide support to windings
  2. reduce hysteresis loss
  3. decrease the reluctance of the magnetic path ✓ Correct answer
  4. reduce eddy current losses 167.A transformer cannot raise or lower the voltage of a D.C. supply because

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Question #391Basic Electricity and Electronics

Primary winding of a transformer

  1. is always a low voltage winding
  2. is always a high voltage winding
  3. could either be a low voltage or high voltage winding ✓ Correct answer
  4. none of the above 169.An ideal transformer is one which has

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Question #392Basic Electricity and Electronics

The transformer laminations are insulated from each other by

  1. mica strip
  2. thin coat of varnish ✓ Correct answer
  3. paper
  4. any of the above

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Question #393Basic Electricity and Electronics

The size of a transformer core will depend on

  1. frequency
  2. area of the core
  3. flux density of the core material
  4. All of the above ✓ Correct answer
Explanation: Transformer core size depends on frequency, core area and flux density of the core material (among other design factors).

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Question #394Basic Electricity and Electronics

The primary and secondary winding of a transformer are

  1. Conductively linked.
  2. Inductively linked.
  3. Electrically linked. ✓ Correct answer
  4. Mechanically linked. 174.What type of component is often used as an adjustable volume control?

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Question #396Basic Electricity and Electronics

Increasing the number of turns on an inductor will make its inductance:

  1. decrease
  2. increase ✓ Correct answer
  3. remain unchanged
  4. become resistive 182.Which of the following is commonly used as a visual indicator?

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Question #397Basic Electricity and Electronics

Zener Diodes are used for

  1. Rectification
  2. Detection
  3. Voltage regulation ✓ Correct answer
  4. Current Regulation

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