If you are hauling hazardous materials and have ___ tires on your vehicle, you must stop and check them every time you park.
  • dual
You must have placards for explosives, poison gas, or dangerous when wet exceeding …
  • 10 pounds, 10 cartons, or 100 pounds amount
Coronavirus (COVID-19) disease
Where did the World Health Organization (WHO) declared the outbreak of a new coronavirus disease in January 2020?
  • Hubei in China
What is leap year?
  • Every year that is exactly divisible by 4 is a leap year and the centurial years are leap years if they are exactly divisible by 400.
Which of the following will affect the stopping power of spring brakes?
  • Road conditions
  • Proper adjustment
  • Modulating control valve position (if equipped)
A dual air brake system has which of the following features?
  • One set of brake controls and two separate air brake systems
Which of the following parts of the air brake systems should be checked during the pre-trip walk around inspection?
  • Slack adjusters on S-cam brakes
  • Air hoses connected to the brake chambers
  • Brake discs or drums

During inspection, if a slack adjuster moves less than about one inch where the push rod attaches to it, which of the following statements is true?

  • It has the appropriate amount of slack
When testing the air leakage rate (by turning off the engine and releasing the parking brake), what is an acceptable air loss rate?
  • Less than 2 psi in one minute for single vehicles and less than 3 psi in one minute for combination vehicles.
Which of the following is not a step in testing that the spring brakes come on automatically?
  • Pull out the parking brake control knob
If you use controlled braking, which of the following is an acceptable procedure?
  • Release the brakes if you need to make a large steering adjustment
What should you do if the low air pressure warning light comes on?
  • Stop and safely park your vehicle as quickly as possible
What is the proper technique to use when braking on downgrades?
  • Apply the brakes just hard enough to slow down about 5 mph below your safe speed
If your vehicle does not have automatic air tank drains, how often should you drain the tanks?
  • At the end of each working day
When is it acceptable to not use parking brakes if you have to leave your vehicle unattended?
  • You should never leave your vehicle without using parking brakes or chocking the wheels