ASVAB ASVAB Certifications ASVAB-SECTION-5 Questions & Answers

• Question 51:

  If you plug an appliance designed for AC into a DC power source, the appliance __________.

  A. will operate normally

  B. will produce excessive heat

  C. won't operate

  D. will explode into tiny pieces

  Correct Answer: B

  When DC is applied to an AC appliance, the amount of resistance is less, so more current flows through the wire and heat builds up.

• Question 52:

  Electronic circuits that produce high frequency AC are called __________.

  A. amplifiers

  B. regulators

  C. transformers

  D. oscillators

  Correct Answer: D

  Oscillators produce high-frequency AC.

• Question 53:

  Silver is a better conductor than copper. But copper is more often used because of __________.

  A. the cost of silver

  B. the strength of copper

  C. the low melting point of silver

  D. the tendency of silver to tarnish

  Correct Answer: A

  Silver is a better conductor, but it's prohibitively expensive.

• Question 54:

  To cause a current of 10 amperes to flow through 20-ohm resistance, the voltage needed is __________.

  A. 20 volts

  B. 1 volt

  C. 10 volts

  D. 200 volts

  Correct Answer: D

  Ohm's law states that V = IR. V = 10 ?20 = 200.

• Question 55:

  The ground wire is always __________.

  A. green

  B. black

  C. whitish

  D. blue

  Correct Answer: A

  Ground wires are always green.

• Question 56:

  Which of the following isn't a conductor of electricity?

  A. water

  B. graphite

  C. gold

  D. glass

  Correct Answer: D

  Glass is an insulator. Other insulators are plastics, paper, and rubber.

• Question 57:

  Electricians use the term low potential to refer to __________.

  A. electrical circuits with a low potential for overload

  B. building codes that reduce the risk of fire

  C. the likelihood of getting a raise this year

  D. 600 watts or less

  Correct Answer: D

  Potential equals voltage; low potential is anything less than 600 watts.

• Question 58:

  A microwave is rated at 1,200 watts.

  At 120 volts, how much current does it draw?

  A. 1 amp

  B. 10 amps

  C. 100 amps

  D. 1,440 amps

  Correct Answer: B

  I (current) = Power (watts)/Effort (volts). In this case, I = 1200/120 = 10 amperes.

• Question 59:

  

  The symbol above stands for __________.

  A. battery

  B. inductor

  C. transformer

  D. diode

  Correct Answer: C

  The symbol stands for transformer. Transformers are used to step up (increase) and step down (decrease) AC voltages.

• Question 60:

  How many paths of electrical flow can be found in a series circuit?

  A. one

  B. two

  C. two or more

  D. It can't be determined from the information given.

  Correct Answer: A

  An example of a series circuit would be a string of Christmas lights. If you break the circuit's path at any point, electricity will stop flowing and the lights will not work.