Evaluation and Testing Process Flashcards
7 cards from real 310T practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Evaluation and Testing Process flashcards as text
A technician evaluates a truck's alternator output using a VAT (Volt-Ampere Tester). At full rated load the alternator produces 85 amps but is rated at 130 amps. This MOST likely indicates:
Answer: A worn alternator requiring replacement or rebuilding
An alternator significantly below rated output under a full load test indicates worn brushes, diodes, or stator windings reducing charging capacity.
When evaluating an electronic air suspension system on a coach, ride height is correct when loaded but drops during extended stops. The MOST likely cause is:
Answer: A faulty height control valve leaking air from the air springs
A leaking height control valve or air spring allows air to slowly bleed off during stationary periods, causing gradual ride height loss.
During a truck brake inspection, the technician measures 5/32-inch lining thickness on the front brake shoes. According to FMCSA regulations, this vehicle:
Answer: Passes; linings are above the minimum 4/32-inch requirement
FMCSA 393.47 requires a minimum of 4/32 inch for steering axle brake linings; 5/32 inch exceeds this minimum and passes inspection.
When road testing a truck with a reported intermittent miss at highway speed, the technician should:
Answer: Attempt to duplicate the concern at the conditions and speed reported by the driver
Intermittent faults must be reproduced under the exact conditions that trigger them; duplicating the driver's complaint is the only way to capture data.
A technician is evaluating injector return fuel quantity on a common-rail diesel engine. Excessive return flow from one injector indicates:
Answer: Internal injector wear causing excessive bypass leakage past the needle valve
High return flow from a single injector indicates internal wear allowing fuel to bypass the needle seat, reducing injection quantity and power.
When testing a truck's engine for coolant contamination in the engine oil, the BEST initial screening test is:
Answer: Using a chemical test strip or combustion leak tester on the coolant overflow
A combustion leak tester or chemical test strip detects combustion gases or exhaust hydrocarbons in the coolant, confirming head gasket or liner seal failure.
During post-repair verification testing of an ABS brake repair, the technician should:
Answer: Clear codes, road test, and confirm the ABS lamp extinguishes and no codes reset
Post-repair verification requires clearing codes, performing a road test above ABS activation threshold, and confirming no faults return and the lamp stays off.