North Carolina CDL — General Knowledge Practice Test 5

1.Going from 20 mph up to 40 mph roughly multiplies your braking distance by how much?
About 4 times greaterAbout 2 times greaterAbout 8 times greaterAbout the same
2.You are behind the wheel of a 40-foot vehicle traveling 35 mph. What following distance, in seconds, should you maintain?
2 seconds6 seconds4 seconds3 seconds
3.Signs identify certain public crossings where approaching trains do not sound a horn. What does that tell you?
The rails at that spot are out of serviceYou may roll across without slowingYou cannot count on hearing a train, so look carefully for one
4.What are the three good rules for using turn signals when you turn?
Signal only if traffic is presentSignal late, briefly, and cancel earlyUse hand signals insteadSignal early, continuously, and then cancel
5.If a first alcohol offense occurs while you are driving a CMV placarded for hazardous materials, how long will you lose your CDL?
For life60 daysThree yearsOne year
6.For tires other than the front steering-axle tires, how much tread depth must remain in each major groove?
4/32 of an inch2/32 of an inch3/32 of an inchNo minimum applies
7.Why should you double-check both directions when crossing multiple tracks?
Trains never use two tracksThe bells will always warn youA train on one track can hide another on a second trackThe gates always protect you
8.On an air-brake vehicle, how long should it take for pressure to climb from 50 up to 90 psi?
Within 30 secondsWithin 10 minutesWithin 3 minutesWithin 1 hour
9.On a tractor, truck, or bus, what color is the ABS malfunction lamp on the instrument panel?
GreenBlueRedYellow
10.The manual's rule for following distance at speeds under 40 mph is about one second for each what?
Each 10 feet of vehicle lengthEach 5 mph of speedEach ton of cargoEach lane you cross