ASVAB ASVAB Certifications ASVAB-SECTION-5 Questions & Answers

• Question 21:

  Which of the following contains an electromagnet?

  A. Light switch

  B. Doorbell

  C. Fluorescent lightbulb

  D. Incandescent lightbulb

  Correct Answer: B

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

• Question 22:

  Parallel resonance occurs in a circuit when __________.

  A. Z = XL

  B. Z=XC

  C. X=2xFc

  D. XL=XC

  Correct Answer: D

  Resonance occurs in any circuit when the inductive reactance and the capacitive reactance are equal.

• Question 23:

  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.

  Correct Answer: C

  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 24:

  Current that changes polarity many times per second is called __________.

  A. direct current

  B. oscillating current

  C. alternating current

  D. AC/DC current

  Correct Answer: C

  Current that changes polarity many times per second is called alternating current.

• Question 25:

  Another name for a transistor is __________.

  A. integrated circuit

  B. semiconductor

  C. transfer resistor

  D. rathbone connector

  Correct Answer: C

  The word "transistor" is a shortening of the term "transfer resistor". The transistor's original name when it was invented in 1933 was the "crystal amplifier".

• Question 26:

  Capacitors connected in parallel __________.

  A. produce less capacitance.

  B. produce more capacitance.

  C. are capable of handling more voltage.

  D. produce a higher WVDC rating.

  Correct Answer: B

  Capacitors connected in parallel effectively increase the plate area, which allows for more storage of electrons and more capacity or capacitance.

• Question 27:

  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

  Correct Answer: B

  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 28:

  When the secondary side of a transformer has more turns than the primary side, the output voltage will be ___________ the input voltage.

  A. lower than

  B. higher than

  C. the same as

  D. the square root of

  Correct Answer: B

  When the secondary side of a transformer has more turns than the primary side, the output voltage will be higher than the input voltage.

• Question 29:

  How much power is being carried in a 220-volt circuit when the current is 10 amps?

  A. 22 watts

  B. 220 watts

  C. 2,200 watts

  D. 4,400 watts

  Correct Answer: C

  How much power is being carried in a 220-volt circuit when the current is 10 amps? 2,200 watts (220 volts multiplied by 10 amps = 2,200 watts).

• Question 30:

  

  The above symbol represents a __________.

  A. rheostat

  B. capacitor

  C. relay

  D. potentiometer

  Correct Answer: A

  This type of variable resister is usually used to control voltage.