General Knowledge Flashcards

DOUBLING YOUR SPEED HAS WHAT EFFECT ON BRAKING DISTANCE?

Answer: Twice the speed = four times the stopping distance

Doubling your speed has a significant effect on braking distance, increasing it by four times. This is because kinetic energy, which must be dissipated by the brakes, increases with the square of the speed. Therefore, if you double your speed, your vehicle has four times the kinetic energy, requiring four times the braking distance to stop.

COMMON MEDICINES FOR COLDS CAN MAKE YOU SLEEPY.

Answer: TRUE

This is true. Many common over-the-counter medicines for colds, allergies, or pain relief contain ingredients that can cause drowsiness, dizziness, or impaired judgment. Driving while under the influence of these medications can be as dangerous as driving while fatigued or impaired by alcohol. Always read warning labels and understand the side effects of any medication before driving.

WHAT ARE THE THREE RULES FOR USING YOUR TURN SIGNALS?

Answer: 1. Signal early 2. Signal continuously 3. Make sure the signal turns off after the turn is completed

The three essential rules for using your turn signals are to signal early, signal continuously, and ensure the signal turns off after the turn is completed. Signaling early gives other drivers ample warning of your intentions. Signaling continuously ensures your intentions remain clear throughout the maneuver. Making sure the signal turns off prevents confusion for other drivers who might think you are planning another turn.

IF YOU ARE DRIVING A 30-FOOT VEHICLE AT 55 MPH, HOW MANY SECONDS OF FOLLOWING DISTANCE SHOULD YOU ALLOW?

Answer: 4 seconds

For commercial vehicles, a common rule of thumb for following distance is one second for every 10 feet of vehicle length, plus an additional second for speeds over 40 mph. For a 30-foot vehicle, that's 3 seconds (30 feet / 10 feet/second). Since you're traveling at 55 mph (over 40 mph), you add an extra second, making the total recommended following distance 4 seconds.

IF YOU SWING WIDE TO THE LEFT BEFORE TURNING RIGHT, ANOTHER DRIVER MAY TRY TO PASS YOU ON THE RIGHT. TRUE OR FALSE?

Answer: TRUE

This statement is true. When a long vehicle swings wide to the left before making a right turn, it creates a large gap on its right side. Other drivers, especially those unaware of the challenges of turning a long vehicle, might mistakenly interpret this gap as an invitation to pass on the right, leading to a dangerous collision. It's crucial for CDL drivers to be aware of this risk and block the lane if necessary.

WHICH OF THE FOLLOWING EMERGENCY ITEMS ARE YOU NOT REQUIRED TO HAVE AVAILABLE?

Answer: First aid kit

While a first aid kit is highly recommended for any vehicle, it is generally not a federally mandated emergency item for commercial vehicles. Federal regulations typically require a fire extinguisher, spare fuses (unless the vehicle has circuit breakers), and warning triangles or flares. State-specific regulations may vary, but the first aid kit is usually an optional safety item.

HOW DO ANTILOCK BRAKES HELP YOU?

Answer: They help you avoid wheel lock up and maintain control while braking

Antilock Braking Systems (ABS) are designed to prevent the wheels from locking up during hard braking. By rapidly modulating brake pressure, ABS allows the driver to maintain steering control and stability, even during emergency stops. While ABS helps maintain control, it does not always shorten stopping distances and is primarily focused on preventing skids and allowing steering.

WHAT THINGS SHOULD YOU CHECK DURING A TRIP?

Answer: Watch gauges for signs of trouble

During a trip, it is crucial to constantly watch your vehicle's gauges for signs of trouble. Gauges provide vital information about engine temperature, oil pressure, air pressure, and other critical systems. Monitoring them allows you to detect potential mechanical issues early, preventing breakdowns or more severe damage, and ensuring safe operation.

WHEN LOADING THE CARGO COMPARTMENT OF A VEHICLE IT IS BEST TO PLACE HEAVY ITEMS ON THE BOTTOM AND THE LIGHT ITEMS ON TOP.

Answer: TRUE

When loading cargo, it is best practice to place heavy items on the bottom and lighter items on top. This arrangement helps to keep the vehicle's center of gravity low, which significantly improves stability and reduces the risk of rollovers, especially during turns or sudden maneuvers. Proper weight distribution is essential for safe vehicle handling.

WHEN CARING FOR AN INJURED PERSON, YOU SHOULD:

Answer: All of the above

When caring for an injured person, all the listed actions are important. You should only move them if they are in immediate danger from fire or traffic to prevent further injury. Applying direct pressure to any wounds helps control bleeding. Keeping the injured person warm helps prevent shock. These are basic first aid principles to stabilize an injured person until professional medical help arrives.

HOW MANY CLASSES OF HAZARDOUS MATERIALS ARE THERE?

Answer: 9

According to the United Nations Recommendations on the Transport of Dangerous Goods, there are nine main classes of hazardous materials. These classes categorize different types of dangerous goods based on their primary hazard, such as explosives, gases, flammable liquids, and corrosive substances. Each class has specific regulations for handling, labeling, and transportation.

YOUR VEHICLE BRAKES DOWN ON AN UNDIVIDED HIGHWAY. THERE ARE NO HILLS OR CURVES WITH IN A MILE IN EITHER DIRECTION. WHERE SHOULD YOU PLACE THE WARNING TRIANGLES?

Answer: 100 feet in front, 10 feet behind and 100 feet behind the vehicle

When your vehicle breaks down on an undivided highway with no hills or curves within a mile, you must place warning triangles to alert other drivers. The correct placement is one triangle 100 feet in front of the vehicle, one 10 feet behind, and another 100 feet behind the vehicle. This setup provides adequate warning for traffic approaching from both directions.

HOW IS GROSS COMBINATION WEIGHT RATING DIFFERENT FROM GROSS COMBINATION WEIGHT?

Answer: GCW is the total weight of a powered unit, plus trailer(s), plus the cargo, GCWR is maximum GCW specified by the manufacturer for a specific combination of vehicles plus its load

Gross Combination Weight (GCW) is the actual total weight of a powered unit (like a truck tractor), plus any attached trailer(s), plus all the cargo being carried. Gross Combination Weight Rating (GCWR) is the maximum permissible weight specified by the manufacturer for a specific combination of vehicles and its load. GCWR is a safety limit set by the manufacturer, while GCW is the actual measured weight at any given time.

REACTION TIME OR DISTANCE IS?

Answer: The distance traveled from the time your brain tells your foot to move from the accelerator to actually pushing on the brake pedal

Reaction time or distance is defined as the distance your vehicle travels from the moment your brain tells your foot to move from the accelerator to the brake pedal until you actually begin pushing the brake pedal. It's the time it takes for your physical response to a perceived hazard. This is distinct from perception distance (recognizing the hazard) and braking distance (after brakes are applied).

WHAT IS THE MINIMUM NUMBER OF TIE-DOWNS REQUIRED FOR A SMALL LOAD?

Answer: 2

Even for small loads, a minimum of two tie-downs is required to properly secure them. Using at least two tie-downs ensures that the load is held firmly in place and prevents it from shifting or falling off the vehicle, which could create a hazard for other road users. This rule applies regardless of the load's size, emphasizing the importance of securement.

WHAT ARE SOME THINGS YOU CAN DO TO REDUCE YOUR STRESS BEFORE AND WHILE YOU DRIVE?

Answer: Listen to 'easy listening' music and give the ride your full attention

To reduce stress before and while driving, it's beneficial to create a calm and focused environment. Listening to 'easy listening' music can help relax you, and giving the ride your full attention minimizes distractions and allows you to focus on safe driving. Avoiding heavy meals, excessive caffeine, or distracting phone calls helps maintain alertness and reduces stress levels.

WHAT SHOULD WHEEL BEARING SEALS BE CHECKED FOR?

Answer: Leaking

Wheel bearing seals prevent lubricating grease or oil from escaping the bearings and protect them from dirt and moisture. Leaking seals indicate a potential failure, which can lead to insufficient lubrication, overheating, and eventual damage to the wheel bearings. Regular checks for leaks ensure the bearings remain properly lubricated and protected, maintaining safe operation and preventing costly repairs.

WHAT TYPE OF VEHICLES CAN GET STUCK ON A RAILROAD-HIGHWAY CROSSING?

Answer: Low slung units, single-axle tractors pulling a long trailer

Vehicles with low ground clearance, such as 'low slung units,' or those with a long wheelbase like a single-axle tractor pulling a long trailer, are particularly susceptible to getting stuck on raised railroad crossings. The angle of approach and departure at these crossings can cause the vehicle's undercarriage to high-center. This creates a dangerous situation where the vehicle blocks the tracks, risking a collision with an oncoming train.

COFFEE AND A LITTLE FRESH AIR WILL HELP A DRINKER SOBER UP.

Answer: FALSE

This statement is FALSE. The only effective way for a person to sober up is to allow their body sufficient time to metabolize the alcohol. Coffee, fresh air, cold showers, or other common remedies do not speed up the rate at which the liver processes alcohol. Relying on these myths can give a false sense of sobriety, leading to impaired judgment and dangerous driving.