US North Carolina DMV CDL Air Brakes Test 8

DMV & CDL » Category

Author: TestGru Team (Education Specialist)

20 questions · All questions on one page

Prepared with up-to-date content

DMV North Carolina — Cdl Air Brakes DMV — North Carolina (USA, State Traffic Law) USA — North Carolina State DMV & FMCSA (MUTCD) — USA

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

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

What powers air brakes?

A) compressed air

B) springs only

C) electricity

D) hydraulic fluid

Question 2

What is governor cut-in pressure?

A) 60 psi

B) 200 psi

C) 150 psi

D) about 100 psi (85-100 range)

Question 3

What is governor cut-out pressure?

A) 90 psi

B) 200 psi

C) about 125 psi (120-135 range)

D) 60 psi

Question 4

At what pressure does low-air warning activate?

A) 100 psi

B) 20 psi

C) at or before 60 psi (55-75 range)

D) 125 psi

Question 5

What are spring brakes?

A) steering brakes

B) service brakes

C) no brakes

D) emergency/parking brakes applying on air loss

Question 6

What is the dual air brake system?

A) single only

B) two separate systems for safety

C) steering only

D) no dual

Question 7

What must you do before driving after starting?

A) no check

B) build pressure 100-125 psi and test

C) mirrors only

D) drive at 50 psi

Question 8

What is brake lag in air brakes?

A) hydraulic only

B) delay between pedal and application

C) instant action

D) no lag

Question 9

What is the air loss limit (single vehicle)?

A) 10 psi

B) no more than 3 psi per minute

C) 1 psi per hour

D) no limit

Question 10

What is the air loss limit (combination)?

A) 3 psi per week

B) 10 psi

C) no more than 4 psi per minute

D) no limit

Question 11

How test air compressor?

A) honk test

B) no test

C) visual only

D) build 85 to 100 psi within 45 seconds

Question 12

How test the low-air warning?

A) disconnect buzzer

B) ignore it

C) fan brakes down, warning by 60 psi

D) drive fast

Question 13

How test spring brakes?

A) no test

B) fan below 20-45 psi, parking knob pops

C) drive test

D) ask mechanic

Question 14

What is a pre-trip air brake check order?

A) drive first

B) governor, warning, spring, leak, service

C) no order

D) any order

Question 15

What are slack adjusters?

A) mirror arms

B) steering parts

C) link pushrod to brake cam

D) fuel lines

Question 16

What is manual slack adjustment rule?

A) needs training; autos should not need it

B) daily manual

C) never check

D) anyone adjusts

Question 17

What is brake adjustment limit?

A) about 1 inch pushrod travel

B) no limit

C) half foot

D) 3 inches

Question 18

What are foundation brakes?

A) parking only

B) the wheel brake mechanisms

C) retarders

D) engine brakes

Question 19

What is an application pressure gauge?

A) fuel gauge

B) speedometer

C) shows service brake air used

D) oil gauge

Question 20

What are supply pressure gauges?

A) tire pressure

B) voltage

C) show tank air pressure

D) coolant

US North Carolina DMV CDL Air Brakes Test 8

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