Class: Date: Energy Power and Transportation Final Exam Multiple Choice Identify the choice that best completes the statement or answers the question. 1. Technician A says a 12-volt light bulb has a resistance of 3 ohms and thus the current running through the bulb must be 4 amperes. Technician B says the current running through the bulb is 36 amperes. Who is 2. Technician A says glass is a poor electrical conductor because it has no free electrons. Technician B says glass is a good electrical conductor and has two free electrons. Who is 3. Technician A says fuses and circuit breakers can both be reset. Technician B says only circuit breakers can be reset. Who is 4. Technician A says fuses and fusible links are both designed to melt when current flow exceeds the design of the circuit. Technician B says fuses do not melt but can be reset after the over-current condition has been corrected. Who is 5. Technician A says a wiring diagram is a map of the physical locations of all electrical components within a vehicle. Technician B says a wiring diagram maps the wires, connections, and load devices in a circuit but does not necessarily show the physical location of these objects. Who is 6. Technician A says a multimeter displays measurements of voltage, current, and resistance. Technician B says a multimeter only displays measurements of voltage and resistance. Who is 1
7. Technician A says the CCA rating of a battery indicates how much current a battery can deliver under specified conditions. Technician B says the CCA rating of a battery indicates how much voltage a battery can produce. Who is 8. Technician A recommends slow charging a battery because slow charging produces less internal heat. Technician A says slow charging produces an excess amount of internal heat. Who is 9. Technician A says that when disconnecting a battery, the positive cable should be removed first. Technician B says there is no particular order in which the battery cables should be disconnected. Who is 10. Technician A says a battery is used to store electrical energy needed to run the starter. Technician B says a battery is used to supply energy to devices once the engine is shut down. Who is 11. Technician A says automotive batteries have a single cell that produces approximately 12.6 volts. Technician B says automotive batteries have six cells that produce approximately 2.1 volts each. Who is 12. Technician A says the starting system converts electrical energy from the battery into mechanical energy from the starter. Technician B says the starting system derives its power from the generator. Who is 13. Technician A says the overrunning clutch prevents the transmission from engaging before the engine has started. Technician B says the overrunning clutch prevents the engine from driving the starter. Who is 2
14. Technician A says the park/neutral position switch prevents starter operation when the vehicle is in gear. Technician B says the commutator prevents starter operation when the vehicle is in gear. Who is 15. Technician A says the high current for the starter comes from the battery. Technician B says the high current comes from the ignition switch. Who is 16. Technician A says the normal range for charging system voltage is 10.0 to 15.0 volts. Technician B says the normal range for charging system voltage is 13.5 to 14.5 volts. Who is 17. Technician A says that after servicing the charging system you should verify proper charging system operation before returning the vehicle to its owner. Technician B says that after servicing the charging system you should check the battery before returning the vehicle to its owner. Who is 18. Technician A says a generator works on the principle of electromagnetic induction. Technician B says a generator is driven by the engine. Who is 19. Technician A says AC voltage in the stator is rectified to DC voltage by the one-way action of the diodes. Technician B says the voltage in the stator is already DC. Who is 20. Technician A says warning lamp circuits are grounded internally. Technician B says warning lamp circuits are grounded externally. Who is 3
21. Technician A says a gauge sending unit can be checked by grounding the lead wire and watching for gauge pointer movement. Technician B says a gauge sending unit can only be checked using a gauge tester. Who is 22. Technician A says the brake warning light alerts the driver to a problem with one or more of the brake systems. Technician B says the brake warning lamp only indicates that the parking brake is still in the apply position. Who is 23. Technician A says the brake light switch may be used to provide information to the ABS or torque converter clutch. Technician B says the brake light switch may be used to provide information to the cruise control system. Who is 24. Technician A says the brake fluid level sensor light alerts the driver to an overfilled master cylinder. Technician B says the brake fluid level sensor light alerts the driver to a low fluid level in the reservoir. Who is 25. Technician A says daytime running lights keep the battery from overcharging. Technician B says daytime running lights are a safety feature. Who is 26. Technician A says aspect ratio refers to the ratio of a tire s section height and section width. Technician B says aspect ratio refers to the ratio of a tire s weight to its center of gravity. Who is 27. Technician A says a tire s tread is never asymmetrical. Technician B says a tire may have a symmetrical or asymmetrical tread. Who is 4
28. Technician A says US DOT indicates the alignment location for the tire on the wheel. Technician B says US DOT indicates the US Department of Transportation safety standard code. Who is 29. Technician A says cupping indicates that the tires have not been rotated very often. Technician B says cupping indicates that the wheels may be improperly balanced, the shock absorbers may be worn, or the ball joints may be worn. Who is 30. Technician A says wheel fasteners must be tightened in a specific pattern to avoid missing one of the fasteners. Technician B says wheel fasteners must be tightened in a specific pattern to spread the torque load as evenly as possible across the face of the wheel. Who is 31. Technician A says tires and wheels should be checked for balance to improve their appearance. Technician B says tires and wheels should be checked for balance to avoid vibration or shimmy during operation. Who is 32. Technician A says dynamic or spin balancing is the most accurate method. Technician B says static balancing is the most accurate method. Who is 33. Technician A says the brand name and model name of a tire often appear on its sidewall. Technician B says the tire s size and speed symbol are often included on the sidewall. Who is 34. Technician A says rim diameter is one of the dimensions used to describe a wheel. Technician B says rim diameter is the measurement from the inside bead seat wall to the opposite bead seat wall. Who is 5
35. Technician A says you should remove the valve core before positioning the valve stem in the wheel. Technician B says you should leave the valve core in the valve stem while positioning the valve stem in the wheel. Who is 36. Technician A says a tire marked 235/60R15 has an overall height of 235 mm, is 60 mm wide, and is used for racing. Technician B says the tire has a 235-mm section width, has an aspect ratio of 60, and is of radial construction. Who is 37. Technician A says the lower the treadwear rating number of a tire, the longer the tread will last. Technician B says the higher the treadwear rating number, the longer the tread will last. Who is 38. Technician A says that in a recirculating-ball steering system, steel balls recirculate continuously within guide paths. Technician B says the steel balls float loosely within the steering mechanism. Who is 39. Technician A says the advantage of a rack-and-pinion steering system is that it has fewer parts. Technician B says the advantage of a rack-and-pinion steering system is that it is space and weight saving. Who is 40. Technician A says steering ratio determines the number of degrees a steering wheel must be turned to turn the road wheels one degree. Technician B says steering ratio determines the number of degrees a steering wheel must be turned to turn the road wheels five degrees. Who is 41. Technician A says the A/C compressor produces the hydraulic pressure needed to run the power steering. Technician B says the power steering pump produces the hydraulic pressure needed to run the power steering. Who is 6
42. Technician A says that when bleeding a power steering system, the steering wheel must be turned from full left to full right several times to boost fluid temperature. Technician B says boosting the fluid temperature is unnecessary. Who is 43. Technician A says power steering fluid operates at a very low pressure at all times. Technician B says both power steering gear hoses operate at the same pressure. Who is 44. Technician A says whenever you replace a rack-and-pinion tie rod, you will have to check and possibly adjust the front wheel toe-in. Technician B says the tie rod will have no effect on the wheel toe-in angle. Who is 45. Technician A says the purpose of a shock absorber is to absorb road shock. Technician B says the purpose of a shock absorber is to control suspension travel. Who is 46. Technician A says shock absorber mounts are not designed to carry the total vehicle weight. Technician B says shock absorber mounts are designed to carry the total vehicle weight. Who is 47. Technician A says the anti-sway bar prevents the driver from rocking the steering wheel back and forth rapidly. Technician B says the anti-sway bar controls body roll and sway. Who is 48. Technician A says a double-a arm suspension design has two control arms, one upper and one lower. Technician B says there is a coil spring between the two control arms. Who is 7
49. Technician A says a MacPherson strut comprises a shock absorber and a torsion bar. Technician B says a MacPherson strut comprises a shock absorber and a coil spring in a single unit. Who is 50. Technician A says it is not necessary to complete any preliminary checks before performing an alignment. Technician B says preliminary checks should be made before performing a vehicle alignment. Who is 8