CSLB General Building (B) Trade Practice Test

Câu hỏi luyện tập mẫu

Một vài câu hỏi thực tế từ ngân hàng miễn phí này, kèm giải thích đầy đủ. Dùng công cụ luyện tập ở trên cho toàn bộ.

1. 1. Vehicle Inspection

   You arrive for your shift and the tractor was driven by another driver yesterday. Before you move the vehicle, what does the federal rule require you to do first?

   • a.Drain the air tanks and rebuild pressure from zero
   • b.Weigh the loaded vehicle at the nearest certified scale
   • c.Review the last driver vehicle inspection report and be satisfied the vehicle is in safe operating condition
   • d.Road test the vehicle for at least two miles before loading

   Đáp án: c

   Giải thích: A driver must review the previous driver's inspection report and sign it if defects were noted and certified as repaired, then be satisfied the vehicle is safe to operate. Draining tanks completely and rebuilding pressure is not a required daily step, weighing is a cargo issue rather than a pre-trip requirement, and no minimum road-test distance is required before loading.

   Nguồn: 49 CFR §396.13

2. 2. Vehicle Inspection

   Why is a leaking exhaust system a serious defect that must be corrected before driving?

   • a.Exhaust gas including carbon monoxide can enter the cab and poison the driver
   • b.It always causes the engine to stall at highway speed
   • c.It automatically triggers the low-air-pressure warning
   • d.It prevents the transmission from shifting into high gear

   Đáp án: a

   Giải thích: Leaking exhaust can allow carbon monoxide and heat into the cab and can ignite nearby fuel or wiring, which is why it must be repaired before operating. Exhaust leaks do not stall the engine on their own, have nothing to do with air-pressure warnings, and do not lock out the transmission.

3. 3. Vehicle Inspection

   Which statement best describes the driver's legal responsibility before operating a commercial vehicle?

   • a.The mechanic's signature transfers responsibility away from the driver
   • b.Only the motor carrier is responsible for vehicle condition
   • c.Responsibility begins only after the first 50 miles of the trip
   • d.The driver must be satisfied that service brakes, parking brake, steering, lights, tires, horn, wipers, mirrors, coupling devices, wheels, and emergency equipment are in good working order

   Đáp án: d

   Giải thích: The regulation places a personal duty on the driver to be satisfied that a specific list of components is in good working order before driving. A mechanic's signature and the carrier's own duties do not remove the driver's responsibility, and it applies from the first mile.

   Nguồn: 49 CFR §392.7

4. 4. Safe Driving

   Which factors determine the safe speed for descending a mountain grade?

   • a.Only the posted speed limit
   • b.Total vehicle weight, length and steepness of the grade, road and weather conditions, and the amount of traffic
   • c.Only the size of the engine
   • d.Only the type of brakes installed

   Đáp án: b

   Giải thích: Safe descent speed depends on how much weight the brakes must control, how long and steep the grade is, and the conditions around you. A posted limit is a maximum for ideal conditions, and neither engine size nor brake type alone determines a safe speed.

5. 5. Safe Driving

   You are entering a highway work zone with reduced lanes and workers present. What is the correct driving behavior?

   • a.Maintain highway speed until you see a worker in the lane
   • b.Change lanes as often as needed to keep moving
   • c.Slow to the posted work-zone speed, increase following distance, avoid unnecessary lane changes, and watch for workers and equipment
   • d.Use the shoulder to bypass slow traffic

   Đáp án: c

   Giải thích: Work zones combine narrowed lanes, sudden stops, and people on foot, so lower speed and extra space are essential, and fines are often doubled. Maintaining highway speed, weaving between lanes, and using the shoulder all increase the risk to workers and to you.

6. 6. Control & Operation

   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

   Đáp án: a

   Giải thích: 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.

7. 7. Control & Operation

   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

   Đáp án: d

   Giải thích: 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.

8. 8. Emergencies & Hazards

   How can you tell that a tire has failed if you did not hear the blowout?

   • a.The fuel gauge drops rapidly
   • b.A thumping or vibration, a sudden change in steering feel, or the rear of the vehicle fishtailing
   • c.The air pressure gauge reads zero
   • d.The engine loses power

   Đáp án: b

   Giải thích: Vibration, a pull in the steering when a front tire fails, or a fishtailing rear when a rear tire fails are the usual clues. Tire failure does not affect fuel level, brake system air pressure, or engine power.

9. 9. Emergencies & Hazards

   What is the maximum gross vehicle weight generally allowed on the Interstate highway system without a special permit?

   • a.60,000 pounds
   • b.70,000 pounds
   • c.80,000 pounds
   • d.100,000 pounds

   Đáp án: c

   Giải thích: The federal limit is 80,000 pounds gross, with 20,000 pounds on a single axle and 34,000 pounds on a tandem axle set, subject to the bridge formula. Sixty and seventy thousand are below the legal maximum, and 100,000 pounds requires a permit.

10. 10. Regulations & Health

    What is the purpose of an electronic logging device on a commercial motor vehicle?

    • a.To automatically record driving time by connecting to the engine so hours-of-service records are accurate
    • b.To track fuel purchases for tax reporting only
    • c.To replace the requirement to keep any supporting documents
    • d.To measure axle weights while driving

    Đáp án: a

    Giải thích: An ELD synchronizes with the engine to capture driving time automatically, which is why it replaced most paper logs. Fuel tax tracking and weight measurement are separate systems, and drivers must still retain supporting documents.

    Nguồn: 49 CFR §395.8