California CDL — General Knowledge Practice Test 7

1.At speeds below 40 mph, what is the recommended following distance for a commercial vehicle?
One car length, regardless of speedOne second for each 10 feet of vehicle lengthA half second no matter how long the vehicle isNo following distance is needed under 40 mph
2.You come up behind a vehicle displaying a red triangle with an orange center. What does that emblem tell you?
The vehicle is hauling explosivesThe vehicle is disabled and is waiting for a towThe person at the wheel is a student in trainingThe vehicle is not built to travel faster than 25 mph
3.When should you signal before making a turn in a large vehicle?
At the last moment as you start to turnEarly, well before you begin the turnOnly if another vehicle is nearbySignaling is optional in a large vehicle
4.How often should you check your mirrors while driving?
Only once when you first start drivingRegularly, and always before changing lanes, turning, or mergingOnly when you hear another vehicle's hornNever, because mirrors are a distraction
5.How do the convex (curved "spot") mirrors on a truck change what you see?
They make objects look larger and closerThey show the same size as a flat mirrorThey only show what is directly behind youThey make objects look smaller and farther away
6.On a long downgrade, what should be your main way of controlling speed?
Relying on the braking effect of the engine in a low gearRiding the service brakes the whole way downShifting into neutral to coastPumping the throttle repeatedly
7.You come upon a crash and decide to stop and help. Where should you leave your vehicle?
Well clear of the wreck, so you neither add a second crash nor block trafficDirectly behind the wrecked vehicles, to act as a shieldAcross the traffic lanes, to block approaching carsIn the fastest lane with flashers on, to slow everyone down
8.If a tire blows out at highway speed, what is the correct first response?
Brake hard immediately to stopSteer quickly toward the shoulderLet go of the wheel and coastHold the wheel firmly, stay off the brake, and let the vehicle slow
9.What does a yellow, diamond-shaped road sign mean?
It shows the legal speed limitIt warns of a hazard or change in the road aheadIt marks a rest area for trucksIt means the road is closed
10.If a fire breaks out in the cargo area of a sealed trailer, what should you NOT do?
Pull off the road and park away from other vehiclesTurn on your flashers and warn othersNotify emergency servicesOpen the trailer doors to check on the fire