US Iowa DMV CDL Combination Vehicles Test 6

DMV & CDL » Category

Author: TestGru Team (Education Specialist)

20 questions · All questions on one page

Prepared with up-to-date content

DMV Iowa — Cdl Combination DMV — Iowa (USA, State Traffic Law) USA — Iowa State DMV & FMCSA (MUTCD) — USA

What is this test? for Iowa DMV Cdl Combination permit/CDL, USA (MUTCD) — DMV — Iowa (USA, State Traffic Law) level, USA — Iowa.
Is this for you? For driver candidates in Iowa, USA — Cdl Combination permit/CDL (16+, State DMV)
Section: DMV Iowa — Cdl Combination · Education: High School & Adult (16+) · Part: DMV Iowa — Cdl Combination · Country: USA · Region: USA — Iowa

The DMV written test is an important step measuring driver candidates' knowledge of traffic laws, first aid, and vehicle technology.

This test reinforces your theoretical knowledge and provides the fundamentals needed to pass the exam and become a safe driver.

By solving this test of 20 questions, you can both test your knowledge and identify the topics you need to improve.

Question 1

True or false in Iowa: one type.

A) True

B) False

Question 2

True or false in Iowa: visual only.

A) True

B) False

Question 3

True or false in Iowa: fuel valve.

A) True

B) False

Question 4

True or false in Iowa: with doubles.

A) True

B) False

Question 5

Which is correct about CDL combination vehicles in Iowa?

A) tractor plus trailer(s)

B) single truck

C) bus

D) van

Question 6

What is a combination vehicle?

A) single truck

B) bus

C) tractor plus trailer(s)

D) van

Question 7

What is a converter dolly?

A) a spare tire

B) a light

C) a tool box

D) device coupling doubles

Question 8

How couple doubles?

A) any order

B) rear trailer, dolly, front trailer in order

C) no order

D) front first always

Question 9

What is the crack-the-whip effect?

A) tire pop

B) engine surge

C) brake lock

D) rear trailer swings in turns

Question 10

How prevent rollover in combos?

A) speed through

B) no need

C) brake in curve

D) slow well below curve speed

Question 11

What is off-tracking in combos?

A) brake wear

B) rear follows shorter path

C) speeding

D) tire brand

Question 12

How check coupling?

A) paint check

B) tire shine

C) fifth-wheel jaws locked, no gap

D) radio test

Question 13

What is trailer hand valve for?

A) testing trailer brakes only

B) lights

C) fueling

D) parking

Question 14

How test trailer emergency brakes?

A) no test

B) charge, pull supply, tug test

C) drive fast

D) visual only

Question 15

What is a shut-off valve for?

A) controls air to rear in doubles

B) horn

C) fuel flow

D) lights

Question 16

How many valves on last trailer?

A) half open

B) none open (all closed)

C) all open

D) one open

Question 17

What is the air line order?

A) one line enough

B) drive then connect

C) connect service+emergency before moving

D) no lines

Question 18

How inspect pintle hook?

A) latched, safety chains crossed

B) loose ok

C) no chains

D) rust fine

Question 19

What are safety chains for?

A) backup coupling if hook fails

B) looks

C) weight

D) noise

Question 20

How brake with empty trailers?

A) gentler (light trailers lock easily)

B) no brakes

C) same

D) harder

US Iowa DMV CDL Combination Vehicles Test 6

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