Tractive effort is force available at what?
A Driven tire contact
B Engine valve
C Brake pedal
D Radiator fan
Answer: A. Driven tire contact. Tractive effort is longitudinal force generated at the tire-road interface.
Rolling resistance is caused largely by tire what?
A Gear tooth contact
B Fuel combustion
C Brake fluid flow
D Deformation
Answer: D. Deformation. Tire hysteresis and road interaction create rolling resistance.
Aerodynamic drag increases strongly with what vehicle speed?
A Speed cubed always
B Inverse speed
C No speed relation
D Speed squared
Answer: D. Speed squared. For typical road conditions, drag force varies approximately with velocity squared.
Grade resistance depends on vehicle weight and what?
A Tire width only
B Gear count
C Fuel octane
D Road slope
Answer: D. Road slope. The component of weight along a grade resists uphill motion.
Vehicle acceleration requires net force equal to mass times what?
A Velocity
B Acceleration
C Distance
D Torque
Answer: B. Acceleration. Newton’s second law gives F = ma.
Stopping distance includes reaction distance and what?
A Braking distance
B Wheelbase
C Turning radius
D Tire width
Answer: A. Braking distance. Total stopping distance combines distance during driver reaction and braking.
ABS wheel-speed sensors provide data to which system?
A Fuel pump
B Radiator
C Transmission only
D Brake controller
Answer: D. Brake controller. ABS uses wheel-speed signals to modulate brake pressure.
A three-way catalytic converter controls HC, CO and what?
A Water vapor
B NOx
C Nitrogen
D Oxygen only
Answer: B. NOx. Three-way catalysts oxidize hydrocarbons and CO and reduce nitrogen oxides.
An engine cooling system maintains what operating condition?
A Zero friction
B Safe temperature range
C Maximum exhaust pressure
D Fixed fuel octane
Answer: B. Safe temperature range. Cooling controls engine temperature to protect parts and support efficient combustion.
An alternator converts engine rotation into what?
A Hydraulic pressure
B Fuel spray
C Electrical power
D Brake force
Answer: C. Electrical power. The alternator generates electrical energy to power loads and charge the battery.
A starter motor uses battery power to rotate what?
A Crankshaft
B Camshaft only
C Differential
D Radiator fan
Answer: A. Crankshaft. The starter turns the crankshaft to initiate engine operation.
An ECU uses sensor data to control fuel and what?
A Tire tread
B Brake pad wear only
C Suspension spring rate
D Ignition timing
Answer: D. Ignition timing. The engine control unit manages fuel delivery, ignition and emissions functions.
On-board diagnostics monitors which system?
A Vehicle faults and emissions
B Road surface only
C Driver height
D Tire brand
Answer: A. Vehicle faults and emissions. OBD monitors control systems and reports detected faults.
An electric vehicle stores energy primarily in what?
A Fuel tank
B Battery pack
C Flywheel only
D Hydraulic accumulator
Answer: B. Battery pack. Battery-electric vehicles store electrical energy in rechargeable battery packs.
A hybrid vehicle combines an engine with what propulsion source?
A Steam turbine
B Hydraulic ram only
C Electric motor
D Solar cell only
Answer: C. Electric motor. Hybrid vehicles combine an internal-combustion engine and electric motor.
A battery-management system monitors cell voltage and what?
A Tire pressure
B Temperature
C Gear backlash
D Brake lining thickness
Answer: B. Temperature. BMS functions include monitoring voltage, current and temperature.
A CAN bus allows electronic modules to do what?
A Communicate serially
B Transmit torque mechanically
C Store fuel
D Cool the engine
Answer: A. Communicate serially. CAN is a vehicle network for communication among control modules.
A tire-pressure monitoring system detects what?
A Low inflation pressure
B Wheel alignment only
C Brake temperature
D Engine oil level
Answer: A. Low inflation pressure. TPMS warns when one or more tires are underinflated.
An airbag is designed to reduce occupant injury during what?
A Normal braking
B Cornering
C Collision
D Engine start
Answer: C. Collision. Airbags inflate during severe impacts to supplement seat belts.
A crumple zone absorbs crash energy through what?
A Rigid nondeformation
B Tire rotation
C Brake pressure
D Controlled deformation
Answer: D. Controlled deformation. Crumple zones deform in a controlled manner to absorb impact energy.
Vehicle stability control can reduce engine torque and apply what?
A Clutch pedal force
B Tire pressure
C Individual brakes
D Fuel octane
Answer: C. Individual brakes. ESC uses selective braking and torque control to help maintain directional stability.
Fuel economy is commonly expressed as distance per what?
A Engine torque
B Battery voltage
C Fuel volume
D Tire width
Answer: C. Fuel volume. Fuel economy may be reported as distance traveled per unit of fuel.
A vehicle’s center of gravity height affects what during cornering?
A Fuel octane
B Gear ratio
C Load transfer
D Electrical resistance
Answer: C. Load transfer. Higher center of gravity increases lateral load transfer for similar acceleration.
A regenerative brake may blend with what conventional system?
A Fuel injection
B Friction brakes
C Cooling circuit
D Steering assist
Answer: B. Friction brakes. Brake blending combines motor regeneration with friction braking to meet demand.
A drive cycle is used to assess vehicle what?
A Performance and emissions
B Wheelbase
C Seat material
D Tire brand
Answer: A. Performance and emissions. Standardized drive cycles evaluate fuel consumption and emissions under defined speed patterns.