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Difficulty: MediumCab Inspection and Engine Start

An intermodal driver performs a standard cab and engine startup inspection on a power unit. Which observation indicates that the cab controls, instruments, or emergency devices meet commercial motor vehicle safety regulations?

  1. A
    The power steering wheel exhibits 25 degrees of free rotational movement before the front steering tires begin to turn.
  2. The oil pressure gauge reaches normal operating levels within seconds of engine startup, and the voltmeter indicates that the alternator is actively charging the electrical system.Answer
  3. C
    The emergency safety equipment includes a charged fire extinguisher and three reflective triangles, but omits spare electrical fuses because blade fuses are installed.
  4. D
    The cab safety kit contains two liquid-burning flares and three orange traffic cones instead of reflective warning devices.

Answer

The oil pressure gauge reaches normal operating levels within seconds of engine startup, and the voltmeter indicates that the alternator is actively charging the electrical system.
Following engine start, oil pressure should build to normal operating levels within seconds, and the ammeter or voltmeter should show that the alternator is actively charging the electrical system. These indicators confirm that vital lubrication and electrical systems are functioning properly.

Step-by-Step Solution

1
Recall the required operating thresholds for dashboard instruments during an engine start.
Oil pressure must rise to normal operating pressure within seconds after starting, and the ammeter or voltmeter must indicate that the alternator is charging the system.
Proper instrument response verifies that essential engine lubrication and electrical charging systems are functional prior to driving.
2
Evaluate the regulatory specifications for steering play and cab emergency equipment.
Steering wheel play must not exceed 10 degrees (about 2 inches on a 20-inch wheel), and emergency gear must include three red reflective triangles, a properly rated and charged fire extinguisher, and spare electrical fuses (unless equipped with circuit breakers).
Exceeding allowable tolerances or missing required emergency equipment constitutes an inspection defect.

Key Concept

In-cab instrument verification, steering play tolerances, and required emergency safety equipment standards during engine startup.
Estimated Time:1m 0s
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Topics

Cab Inspection and Engine Start

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