CSLB General Building (B) Trade Practice Test
Preguntas frecuentes
¿Cuántas preguntas de práctica de CDL General Knowledge hay aquí?+
Un banco completo de preguntas originales de CDL General Knowledge en las áreas oficiales, con el peso del examen real y explicaciones. Gratis, sin registro.
¿Cómo es el examen CDL General Knowledge?+
Unas 50 preguntas, y necesitas 80% para aprobar. Practica por tema aquí y luego haz el simulacro cronometrado para medir tu preparación.
¿Estas son las preguntas reales del examen?+
No. Cada pregunta es 100% original, escrita de fuentes públicas con explicaciones. Nunca copiamos preguntas reales ni material de preparación pagado.
¿Puedo estudiar en chino o español?+
La práctica de PrepPass está en inglés, 中文 y español. El examen oficial es en inglés — cambia el idioma de las preguntas a inglés para ensayar la terminología del día del examen.
Preguntas de práctica de ejemplo
Algunas preguntas reales de este banco gratuito, con explicaciones completas. Usa la herramienta de arriba para el banco completo.
- 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
Respuesta: c
Explicación: 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.
Fuente: 49 CFR §396.13
- 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
Respuesta: a
Explicación: 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. 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
Respuesta: d
Explicación: 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.
Fuente: 49 CFR §392.7
- 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
Respuesta: b
Explicación: 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. 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
Respuesta: c
Explicación: 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. 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
Respuesta: a
Explicación: 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. 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
Respuesta: d
Explicación: 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. 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
Respuesta: b
Explicación: 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. 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
Respuesta: c
Explicación: 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. 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
Respuesta: a
Explicación: 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.
Fuente: 49 CFR §395.8