ASVAB ASVAB-SECTION-5 Online Practice Questions and Exam Preparation

ASVAB ASVAB-SECTION-5 Online Questions & Answers

• Question 121:

  The two types of electrical current are ___________.

  A. direct and changing
  B. backwards and forwards
  C. simple and complex
  D. direct and alternating
  D. direct and alternating

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  Explanation

• Question 122:

  Which of the following contains an electromagnet?

  A. Light switch
  B. Doorbell
  C. Fluorescent lightbulb
  D. Incandescent lightbulb
  B. Doorbell

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  Explanation

  Of the items listed, only a doorbell contains an electromagnet.

• Question 123:

  Carbon has 6 protons and 6 neutrons in its nucleus.

  How many electrons does it have?

  B. 24
  C. 6
  D. 12
  C. 6

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  Explanation

• Question 124:

  A filter is used in a power supply to __________.

  A. convert alternating current to direct current.
  B. change direct current to alternating current.
  C. even out voltage variations.
  D. smooth out power surges.
  C. even out voltage variations.

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  Explanation

  A filter is placed in the power supply to even out any voltage variations. In some cases, a choke may be used in the filter to smooth out the current variations.

• Question 125:

  The SCR is a __________.

  A. specialized rectifier or diode.
  B. special colored rectifier.
  C. special controlled rectifier.
  D. silicon-controlled relay.
  A. specialized rectifier or diode.

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  Explanation

  The SCR is a special type of rectifier. It is used in control circuits. The name SCR was a descriptive one given it by General Electric Company engineers and it caught on in the literature. Its correct name is not silicon-controlled rectifier but thyristor.

• Question 126:

  Radar can operate at frequencies as high as __________.

  A. 100,000 Hz
  B. 100,000 kHz
  C. 100,000 MHz
  D. 500,000 MHz
  C. 100,000 MHz

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  Explanation

  Radar can operate as high as 100,000 MHz (megahertz).

• Question 127:

  A primary advantage of using a Li-Ion battery instead of a NiMH battery in your cell phone is __________.

  A. Li-Ion batteries are lighter
  B. Li-Ion batteries last longer
  C. Li-Ion batteries don't interfere with signal quality
  D. none of the above
  A. Li-Ion batteries are lighter

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  Explanation

  Lithium-Ion batteries are much lighter than Nickel Metal Hydride batteries.

• Question 128:

  Electrical resistance is best defined as ___________.

  A. opposition to the flow of current
  B. the time it takes for electricity to travel 10,000 miles
  C. ease of an electrical current through a conductor
  D. oscillation of the flow of an electrical current
  A. opposition to the flow of current

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  Explanation

• Question 129:

  A 120-volt circuit has a resistance of 12 ohms. How much current is present in the circuit?

  A. 0.1 amperes
  B. 10 amperes
  C. 20 amperes
  D. 1440 amperes
  B. 10 amperes

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  Explanation

  A 120-volt circuit has a resistance of 12 ohms. A current of 10 amperes is flowing through the circuit (120 volts divided by 12 ohms = 10 amps).

• Question 130:

  

  Given the electronic circuit diagram, what is the current flowing through resistor at position R2? (MV = megavolts, k = kilo)

  A. 250 amperes
  B. 0 amperes
  C. 100 milliamperes
  D. 125 amperes
  A. 250 amperes

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  Explanation