CDL COMBINATION VEHICLE EXAM, PRACTICE EXAM
AND STUDY GUIDE NEWEST 2024 ACTUAL EXAM 300
QUESTIONS AND CORRECT DETAILED ANSWERS WITH
(VERIFIED ANSWERS) |ALREADY GRADED A
HOW CAN YOU TEST THE TRAILER EMERGENCY BRAKES? - ANSWER: Place the tractor
emergency valve in the emergency position, try to nudge the vehicle forward.
COMBINATION VEHICLES ARE USUALLY HEAVIER, LONGER, AND REQUIRE MORE
DRIVING SKILL THAN SINGLE COMMERCIAL VEHICLES. - ANSWER: True
WHAT TYPE OF TRAILERS CAN GET STUCK ON RAILROAD-HIGHWAY CROSSINGS? -
ANSWER: Low slung units and single-axle tractor pulling a long trailer with its landing
gear set to accommodate a tandem-axle tractor.
THE AIR LEAKAGE RATE FOR A COMBINATION VEHICLE (ENGINE OFF, BRAKES OFF)
SHOULD BE NO MORE THAN ____ PSI PER MINUTE. - ANSWER: 3
AIR LINES ON A COMBINATION VEHICLE ARE OFTEN COLORED TO KEEP THEM FROM
GETTING MIXED UP. THE EMERGENCY LINE IS ____; THE SERVICE LINE IS ____. -
ANSWER: Red, Blue
THERE ARE TWO THINGS THAT A DRIVER CAN DO TO PREVENT A ROLLOVER. THEY
ARE "GO SLOW AROUND CORNERS" AND _____. - ANSWER: Keep the weight of your
cargo as close to the ground as possible.
YOU ARE DRIVING A SEMI AND THE TRAILER BREAKS AWAY, PULLING APART THE AIR
LINES. YOU EXPECT THE TRAILER BRAKES TO COME ON AND ____ . - ANSWER: The
tractor brakes to keep working.
WHY SHOULD YOU NOT USE THE TRAILER HAND VALVE WHILE DRIVING? - ANSWER:
Because of the danger of making the trailer skid.
WHAT MIGHT HAPPEN IF THE TRAILER IS TOO HIGH WHEN YOU TRY TO COUPLE? -
ANSWER: The trailer may not couple correctly.
WHAT PART OF THE KINGPIN SHOULD THE LOCKING JAWS CLOSE AROUND? -
ANSWER: The shank.
A FULL TRAILER IS 10 TIMES MORE LIKELY TO ROLLOVER THAN AN EMPTY ONE. -
ANSWER: True
REARWARD AMPLIFICATION CAUSES SMALL MOVEMENTS (TURNS) AT THE FRONT
OF THE VEHICLE TO BECOME LARGER SIDE TO SIDE MOVEMENTS AT THE BACK OF
THE VEHICLE. - ANSWER: True
AND STUDY GUIDE NEWEST 2024 ACTUAL EXAM 300
QUESTIONS AND CORRECT DETAILED ANSWERS WITH
(VERIFIED ANSWERS) |ALREADY GRADED A
HOW CAN YOU TEST THE TRAILER EMERGENCY BRAKES? - ANSWER: Place the tractor
emergency valve in the emergency position, try to nudge the vehicle forward.
COMBINATION VEHICLES ARE USUALLY HEAVIER, LONGER, AND REQUIRE MORE
DRIVING SKILL THAN SINGLE COMMERCIAL VEHICLES. - ANSWER: True
WHAT TYPE OF TRAILERS CAN GET STUCK ON RAILROAD-HIGHWAY CROSSINGS? -
ANSWER: Low slung units and single-axle tractor pulling a long trailer with its landing
gear set to accommodate a tandem-axle tractor.
THE AIR LEAKAGE RATE FOR A COMBINATION VEHICLE (ENGINE OFF, BRAKES OFF)
SHOULD BE NO MORE THAN ____ PSI PER MINUTE. - ANSWER: 3
AIR LINES ON A COMBINATION VEHICLE ARE OFTEN COLORED TO KEEP THEM FROM
GETTING MIXED UP. THE EMERGENCY LINE IS ____; THE SERVICE LINE IS ____. -
ANSWER: Red, Blue
THERE ARE TWO THINGS THAT A DRIVER CAN DO TO PREVENT A ROLLOVER. THEY
ARE "GO SLOW AROUND CORNERS" AND _____. - ANSWER: Keep the weight of your
cargo as close to the ground as possible.
YOU ARE DRIVING A SEMI AND THE TRAILER BREAKS AWAY, PULLING APART THE AIR
LINES. YOU EXPECT THE TRAILER BRAKES TO COME ON AND ____ . - ANSWER: The
tractor brakes to keep working.
WHY SHOULD YOU NOT USE THE TRAILER HAND VALVE WHILE DRIVING? - ANSWER:
Because of the danger of making the trailer skid.
WHAT MIGHT HAPPEN IF THE TRAILER IS TOO HIGH WHEN YOU TRY TO COUPLE? -
ANSWER: The trailer may not couple correctly.
WHAT PART OF THE KINGPIN SHOULD THE LOCKING JAWS CLOSE AROUND? -
ANSWER: The shank.
A FULL TRAILER IS 10 TIMES MORE LIKELY TO ROLLOVER THAN AN EMPTY ONE. -
ANSWER: True
REARWARD AMPLIFICATION CAUSES SMALL MOVEMENTS (TURNS) AT THE FRONT
OF THE VEHICLE TO BECOME LARGER SIDE TO SIDE MOVEMENTS AT THE BACK OF
THE VEHICLE. - ANSWER: True
