ASVAB ASVAB Certifications ASVAB-SECTION-5 Questions & Answers

• Question 171:

  Which electronic component can store charge?

  A. a transistor

  B. a transformer

  C. a resistor

  D. a capacitor

  Correct Answer: D

  A capacitor can store a charge. A capacitor stores energy in an electric field. Positive charges collect on one plate and negative charges on the other plate.

• Question 172:

  The two most commonly used metals in solder are __________.

  A. tin and gold

  B. tin and lead

  C. gold and nickel

  D. gold and lead

  Correct Answer: B

  Typical solders are almost equal parts tin and lead.

• Question 173:

  A properly soldered connection will appear __________.

  A. shiny

  B. dull

  C. dark

  D. greasy

  Correct Answer: A

  Shiny joints indicate a properly soldered connection.

• Question 174:

  The FM band covers __________.

  A. 550 to 1,600 kHz

  B. 88 to 108 MHz

  C. 100 to 200 MHz

  D. 550 to 1600 MHz

  Correct Answer: B

  The FM band covers 88 to 108 MHz. The AM band covers 550 to 1600 kilohertz.

• Question 175:

  In an FM receiver the AFC is __________.

  A. automatic frequency control for stabilizing the IF.

  B. automatic frequency control for stabilizing the local oscillator.

  C. automatic frequency control for tuning the incoming frequency.

  D. automatic frequency control for the radio frequency amplifier.

  Correct Answer: B

  On an FM receiver the AFC is automatic frequency control. It keeps the receiver from drifting from the station it is tuned to. This is done by having part of the signal fed back to the local oscillator to keep it operating on the correct frequency and not drifting.

• Question 176:

  

  The symbol above represents a __________.

  A. thyristor

  B. resistor

  C. transistor

  D. fuse

  Correct Answer: B

  The symbol shown represents a resistor.

• Question 177:

  The SCR is a __________.

  A. specialized rectifier or diode.

  B. special colored rectifier.

  C. special controlled rectifier.

  D. silicon-controlled relay.

  Correct Answer: A

  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 178:

  A junction diode is used for __________.

  A. rectifying power-line frequencies and lower currents.

  B. rectifying power-line frequencies and higher currents.

  C. rectifying higher frequencies at lower currents.

  D. rectifying higher frequencies at higher currents.

  Correct Answer: B

  A junction diode has a larger surface area than a point-contact diode, therefore it can be used to handle larger currents at power-line frequencies.

• Question 179:

  Impedance is represented by the symbol __________.

  A. XL

  B. R

  C. XC

  D. Z

  Correct Answer: D

  Impedance is the total opposition to current flow in a circuit. It has its own symbol, Z.

• Question 180:

  In electronics this symbol represents a __________.

  

  A. cathode ray tube

  B. diode

  C. resistor

  D. insulator

  Correct Answer: B

  The symbol shown represents a diode.