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The school bus endorsement applies to applicants who wish to drive a school bus in any Class A or B CDL. To add an S endorsement to your CLP/CDL, you must pass the Iowa school bus test, and you must also pass skills tests in a school bus. The IA CDL bus test consists of 20 questions, and you'll need at least 16 correct answers to pass (80%). The knowledge test covers the following sections of the Iowa CDL Manual: School Buses, Vehicle Inspection Test, Basic Control Skills Test and Road Test. After studying, take this IA CDL practice test to prepare for the actual bus test!
1. Riders getting on or off the bus:
should not be supervised.
are likely to be disruptive.
can stumble and should be supervised.
2. Engine oil pressure should come up to normal within _________ after the engine is started.
two minutes
five minutes
3. After an accident, an improper use of flares could cause:
the springs to put on the brakes.
a fireĀ if spilled fuel is on the ground.
air pressure to build from 50 to 100 psi within 2 minutes.
4. Passive railroad crossings:
do not have yellow circular advance warning signs, pavement markings and crossbucks.
do not require you to stop.
do not have any type of traffic control device.
5. When students are boarding the school bus, you should do all of the following except:
count the number of students at the bus stop and ensure all board the bus.
ask the students to board in pairs.
monitor all mirrors continuously.
6. Before starting down a hill, you should slow down and shift down:
to a gear that will cause your engine to exceed its redline.
so you can coast downhill.
to a speed that you can control without using the brakes hard.
7. When driving in fog, drivers should:
use the windshield wipers.
use low beams.
use high beams.
8. The outside convex mirrors are located:
below the outside flat mirrors.
above the windshield on the driver's side area of the bus.
above the outside flat mirrors.
9. Brakes out of adjustment can cause the other brakes to:
last longer.
apply more braking power.
overheat and fade.
10. How should you brake if your vehicle loses ABS?
Brake as you always have.
Pump the brake repeatedly
Step on and off the brake pedal several times
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IA School Bus Test

Number of questions: 20
Correct answers to pass:16
Passing score:80%
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