ASVAB ASVAB Certifications ASVAB-SECTION-5 Questions & Answers

• Question 11:

  The symbol below is used in electrical diagrams to represent a __________.

  

  A. resistor

  B. capacitor

  C. transformer

  D. transistor

  Correct Answer: B

  The symbol is used in electrical diagrams to represent a capacitor.

• Question 12:

  The folded dipole antenna has an impedance of __________.

  A. 72 ohms

  B. 300 ohms

  C. 600 ohms

  D. 75 ohms

  Correct Answer: B

  The folded dipole antenna ?the one most commonly used for home TV reception ?has an impedance of 300 ohms. The dipole has an impedance of 72 ohms.

• Question 13:

  Analog color television relies on three colors to produce the full color range needed for a good picture: red, blue, and __________.

  A. gray

  B. orange

  C. yellow

  D. green

  Correct Answer: D

  Color television uses red, blue, and green "guns" to direct electron streams toward the phosphors in the front of the picture tube, producing the full color spectrum when combined properly.

• Question 14:

  The two types of diodes used in electronics work are the semiconductor diode and the __________.

  A. vacuum tube diode

  B. full-wave diode

  C. half-wave diode

  D. zener diode

  Correct Answer: A

  The two general types of diodes are the semiconductor and the vacuum tube diode. Both types have their own particular applications and advantages.

• Question 15:

  The two basic types of oscillators used for microwave generation are the magnetron and the __________.

  A. klystron

  B. op amp

  C. clapp oscillator

  D. multivibrator

  Correct Answer: A

  The two basic types of oscillators used in microwave installations are the klystron and the magnetron.

• Question 16:

  The klystron is used in __________.

  A. low-frequency transmitters

  B. radar units

  C. audio frequency amplifiers

  D. frequency detectors

  Correct Answer: B

  The klystron is used as a frequency source in microwave units ?from a microwave oven for the kitchen to a radar unit for an aircraft

• Question 17:

  A crossover network is used to __________.

  A. direct the proper frequency range to the right speaker

  B. eliminate noise

  C. filter out high frequencies

  D. filter out low frequencies

  Correct Answer: A

  A crossover network is designed to make sure that the right frequencies get to a speaker so it can reproduce them better.

• Question 18:

  If both the resistors shown (R1 and R2) in the diagram below are of equal size, what is the voltage at the arrow?

  

  A. 9V

  B. 12 V

  C. 18 V

  D. 24 V

  Correct Answer: B

  The total voltage drop of the circuit must equal the voltage across the battery, which is 24 V.

  Because the resistors are both the same size, each resistor creates half of the total voltage drop: 24/2 =

  12.

  Therefore, the voltage at the arrow is 12 V.

• Question 19:

  A crystal microphone uses __________.

  A. the piezoelectric effect

  B. the Doppler effect

  C. magnetic wavicles to operate

  D. a permanent magnet for resonance

  Correct Answer: A

  A crystal microphone relies on the piezoelectric effect, where a pressure on a crystal produces an electric current.

• Question 20:

  Radio frequency amplifiers are used in __________.

  A. audio amplifiers

  B. differential amplifiers

  C. operational amplifiers

  D. receivers and transmitters

  Correct Answer: D

  Radio frequency amplifiers are used in receivers and transmitters to amplify frequencies above the range of sounds audible to humans.