CSLB General Building (B) — All Questions

Which sequence describes double clutching to shift into a higher gear?

• a.Release the accelerator, push in the clutch and shift to neutral, release the clutch, let engine and gear speeds drop to the range for the next gear, push in the clutch and shift to the higher gear, release the clutch and accelerate✓
• b.Push in the clutch once, shift directly to the higher gear, and release the clutch
• c.Accelerate hard, shift without the clutch, then brake
• d.Shift to neutral, coast until the vehicle slows, then select any gear

Double clutching passes through neutral with the clutch released so engine and transmission speeds can match before the next gear is selected. Single clutching, floating gears without matching speeds, and coasting in neutral all grind gears or leave the vehicle without power control.

When downshifting, what do you do differently compared with upshifting?

• a.You skip neutral entirely
• b.While in neutral with the clutch released, you press the accelerator to raise engine rpm before selecting the lower gear✓
• c.You hold the clutch down through the whole shift
• d.You apply the service brakes throughout the shift

A lower gear turns faster at the same road speed, so engine speed must be increased in neutral to match it. Skipping neutral, riding the clutch, or braking through the shift prevents the speeds from matching and can damage the transmission.

You are approaching a steep downgrade in a truck with a manual transmission. When should you select your gear?

• a.Halfway down, once you can judge the grade
• b.At the bottom, after the vehicle slows
• c.Before you start down the hill, while you still have engine and road speed to shift✓
• d.Only if the brakes begin to fade

Once you are descending it may be impossible to shift into a lower gear, leaving you stuck in neutral with no engine braking. Waiting until partway down, until the bottom, or until the brakes fade all remove the option to select a safe gear.

How do you know when to shift using engine speed?

• a.Shift whenever the vehicle feels slow
• b.Shift at the same road speed in every gear
• c.Shift only when the engine stalls
• d.Learn the operating rpm range for your engine and shift up when the tachometer reaches the top of that range✓

Each engine has a recommended rpm operating range, and the tachometer tells you when the engine has reached the point to shift. Guessing by feel, using a fixed road speed for all gears, or waiting for a stall wastes fuel and can over-rev or lug the engine.

You need to back into a tight dock space and you have a choice of approach. What should you do?

• a.Back toward the blind side because it is a shorter turn
• b.Back at normal forward speed to keep momentum
• c.Back toward the driver's side so you can see the trailer and the space through the side window✓
• d.Rely only on the passenger-side mirror

Driver-side backing lets you look directly out the window and see the rear of the trailer, which is why it is the preferred method. Blind-side backing hides the danger zone, backing fast removes reaction time, and using a single mirror leaves half the area unseen.

What does the safe-backing practice known as GOAL stand for and require?

• a.Get Out And Look, meaning you walk back to inspect the path and clearances before and during backing✓
• b.Gauge Overhead And Left, meaning you check only overhead clearance
• c.Go Only At Low speed, meaning speed is the only concern
• d.Gear Out And Lock, meaning you lock the differential

Getting out and physically checking the path is the single most reliable way to avoid striking objects you cannot see from the seat. The other expansions are invented and none of them replaces actually inspecting the area behind the vehicle.

You are backing a trailer and it begins to drift off your intended line. What is the correct correction?

• a.Continue backing and hope it straightens
• b.Turn the steering wheel sharply and keep backing quickly
• c.Set the parking brake and start over from the dock
• d.Stop, correct with small steering movements or pull forward to reposition, and back slowly using both mirrors✓

Small corrections made early keep the trailer on line, and pulling forward to reset is always acceptable when the angle gets away from you. Continuing blindly, oversteering at speed, or abandoning the maneuver mid-position leads to a jackknife or a collision.

You are making a tight right turn at an intersection in a tractor-trailer. What is the correct technique?

• a.Swing wide to the left before turning so the trailer clears
• b.Keep the rear of the vehicle close to the curb, turn wide as you complete the turn rather than before it, and do not let a vehicle squeeze in on your right✓
• c.Signal left, then turn right
• d.Straddle both lanes for the entire turn

Turning wide at the end keeps the trailer from riding over the curb while preventing another driver from slipping into the gap on your right. Swinging left first invites a vehicle beside you, a left signal misleads other drivers, and straddling lanes for the whole turn blocks traffic unnecessarily.

What is off-tracking, and why does it matter in turns?

• a.The trailer rides a wider path than the tractor, so you must stay left
• b.The rear wheels follow a shorter path than the front wheels, so the trailer can cut across curbs, poles, or an adjacent lane✓
• c.The vehicle drifts backward on an upgrade
• d.The trailer brakes apply before the tractor brakes

Because the rear wheels track inside the path of the steer axle, the longer the vehicle the more the rear cuts the corner. Trailers do not swing wider than the tractor in a turn, and rollback and brake timing are separate issues.

You are coupling a tractor to a trailer. Which step comes immediately before backing under the trailer?

• a.Raise the landing gear fully
• b.Remove the wheel chocks
• c.Perform the tug test
• d.Connect the air lines, supply air to the trailer, and make sure the trailer brakes are locked✓

Charging the trailer air system and locking its brakes keeps the trailer from rolling as the fifth wheel slides under the apron. Raising the landing gear, removing chocks, and the tug test all come after the coupling is made.

Before backing under a trailer, how should the trailer height be set?

• a.Slightly lower than the center of the fifth wheel so the trailer is lifted a little as the tractor backs under✓
• b.High enough that the fifth wheel passes underneath without touching
• c.Exactly level with the top of the fifth wheel
• d.As high as the landing gear will go

A trailer set slightly low is raised as the tractor backs under, which ensures the kingpin engages the jaws properly. A trailer that is too high lets the tractor slide under without coupling or strikes the nose, and exactly level or fully raised risks a missed or damaged coupling.

You are uncoupling a trailer in a yard. Which sequence is correct?

• a.Pull the fifth wheel release, then lower the landing gear, then chock the wheels
• b.Disconnect the air lines first, then pull forward, then lower the landing gear
• c.Ease pressure on the locking jaws, chock the trailer wheels, lower the landing gear until it takes the weight, disconnect the air and electrical lines and secure them, pull the release handle, and pull the tractor partially clear before checking✓
• d.Lower the landing gear, pull completely clear, then disconnect the lines

Taking pressure off the jaws, securing the trailer, setting the landing gear, and only then releasing and easing forward keeps the trailer supported at every step. The other sequences release the coupling or the lines before the trailer is supported, which can drop the trailer or tear the air lines apart.

After uncoupling, you notice the landing gear crank handle is left extended. Why must it be secured?

• a.It affects the trailer air pressure
• b.It voids the inspection report
• c.It changes the axle weight distribution
• d.An unsecured handle can catch on a passing vehicle or on the tractor and cause injury or damage✓

A crank handle left hanging is a physical hazard that can strike people or equipment moving nearby. It has no effect on air pressure, weight distribution, or the validity of an inspection report.

You are parking on a slight grade and will leave the vehicle. What should you do?

• a.Leave the engine running so the air system stays charged
• b.Leave the transmission in a low gear with the brakes released
• c.Shut the engine off, apply the parking brakes, and chock the wheels if the vehicle may roll✓
• d.Rely on the service brakes alone

Parking brakes plus chocks are what hold a heavy vehicle on a grade once the driver leaves. Service brakes bleed off as air pressure drops, and leaving the engine running or the brakes released allows the vehicle to move.

You are on a slick, snow-covered road descending a grade. What should you do with the engine brake or retarder?

• a.Set it to the highest setting for maximum control
• b.Turn it off, because a retarder can cause the drive wheels to lose traction and skid on a slippery surface✓
• c.Cycle it on and off every few seconds
• d.Use it only in combination with the trailer hand valve

Retarders act on the drive wheels, and on ice or packed snow that braking force can break traction and start a jackknife. Higher settings and rapid cycling make the problem worse, and the trailer hand valve should not be used as a speed-control device on a grade.

You are stopped on an upgrade in a manual-transmission truck and need to start moving without rolling back. What is the correct technique?

• a.Partially engage the clutch until you feel the vehicle try to move, then release the parking brake while adding throttle✓
• b.Release the parking brake first, then find the friction point
• c.Rev the engine to maximum and drop the clutch
• d.Start in the highest gear available

Holding the vehicle with the parking brake until the clutch takes hold prevents rollback into whatever is behind you. Releasing the brake first causes rollback, dumping the clutch at high rpm shocks the driveline, and starting in a high gear stalls the engine.

How should you hold the steering wheel when driving a heavy vehicle?

• a.Firmly with both hands on opposite sides of the wheel✓
• b.With one hand at the top of the wheel
• c.With the wrist hooked over the top spoke
• d.With both hands together at the bottom

Both hands on opposite sides give the leverage and control needed if a tire blows or you hit a rut. One-handed, hooked-wrist, and hands-together grips can all be torn loose by a sudden jolt through the steering.

What is the correct way to make a normal stop in a vehicle with air brakes?

• a.Stab the pedal down and release repeatedly
• b.Push the brake pedal down steadily and control the pressure so the vehicle comes to a smooth stop✓
• c.Pull the trailer hand valve first and then use the pedal
• d.Shift to neutral and let the vehicle coast to a stop

Steady, controlled pedal pressure produces a smooth stop and keeps the vehicle in line. Stab braking is an emergency technique, the trailer hand valve alone can cause a trailer skid, and coasting in neutral removes engine braking and control.

Why should you avoid coasting in neutral while driving a commercial vehicle?

• a.It wears out the clutch pedal spring
• b.It causes the tachometer to read incorrectly
• c.You lose engine braking and the ability to accelerate out of a hazard, and it is illegal in many states✓
• d.It automatically disables the ABS

In neutral the engine no longer helps control speed and you cannot power away from a developing hazard, which is why most states prohibit it. Clutch springs, tachometer accuracy, and ABS operation are unrelated to being in neutral.

You need to pull into a truck stop space at night and only a blind-side space is open. What is the safest practice?

• a.Back in quickly before other traffic arrives
• b.Back in using the mirrors alone without stopping
• c.Park in the driving lane instead
• d.Get out and look, walk the path, use a spotter if one is available, and back very slowly with frequent stops to re-check✓

A blind-side maneuver hides the danger area, so walking the path and using a helper or repeated checks is the only safe approach. Rushing, relying only on mirrors, and blocking a driving lane each create a greater hazard.

What happens if you turn too sharply while backing a tractor-trailer?

• a.The trailer brakes lock automatically
• b.The steering axle lifts off the ground
• c.The trailer can jackknife against the tractor and damage both units✓
• d.The fifth wheel unlocks

Excessive angle between tractor and trailer during backing folds the units together and can crush the cab, fenders, or air lines. Trailer brakes do not lock on their own, the steer axle stays down, and the fifth wheel does not unlock from a sharp angle.

Why should you check the trailer height and the position of the fifth wheel jaws visually after coupling, even after a successful tug test?

• a.A high hitch can appear locked while the kingpin sits on top of the closed jaws, which can pull apart in traffic✓
• b.Visual checks are only needed on flatbed trailers
• c.The tug test only checks the electrical connection
• d.The jaws cannot be seen from outside the vehicle

A high hitch can leave the kingpin resting above the jaws so the coupling looks secure but is not, which is why the manual requires looking under the trailer with a flashlight. Visual checks apply to all trailer types, the tug test is a mechanical check, and the jaws are visible from beneath the coupling.